{ "metadata": { "access": "public_free", "capacity_note": "PEC capacity units are unverified. Raw values retained, no unit inferred.", "county_snapshot": "2026-10-01", "emissions_note": "Reported inventory emissions only. Permit limits are not ingested. Missing inventory is not zero emissions.", "free_public_access": true, "generated_at": "2026-10-01T17:04:05+00:00", "generator_total_source": "PEC-derived from DEQ permit documents; LDCW sum of one unambiguous latest-year count per registration.", "schema_version": 1, "sources": { "deq_air_sites": { "retrieved_at": "2026-10-01T17:04:05+00:00", "status": "live" }, "deq_emissions": { "retrieved_at": "2026-10-01T17:04:05+00:00", "status": "live" }, "deq_issued_index": { "last_attempt_at": "2026-10-01T17:04:05+00:00", "note": "HTTP Error 403: Forbidden", "retrieved_at": "2026-09-28T11:14:46+00:00", "source_as_of": "2026-09-21", "status": "cached_source_unavailable" }, "pec_permits": { "retrieved_at": "2026-10-01T17:04:05+00:00", "source_updated_at": "2026-07-23T20:08:00.932000+00:00", "status": "live" } }, "summary_scope": "Loudoun air-site registrations independently identified as data centers. Operating/planned is DEQ air-site status. Tier 4 facilities count unique air-site registrations, not campuses." }, "permits": [ { "address": "22000 AOL Way Dulles, VA 20166", "city": "Dulles", "coordinate_source": "pec", "coordinates": [ -77.4456806567369, 39.005303154117314 ], "data_center_evidence": [ "PEC data-center permit research" ], "deq_data_center_flag": null, "deq_facility_name": "American Real Estate Partners (AREP)", "deq_record_available": false, "deq_registration": "72346", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 6229 ], "tons_per_year": 0.54952, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 6225 ], "tons_per_year": 1.0779349999999999, "year": 2024 }, { "kind": "reported", "pollutant": "PM", "pollutant_name": "Particulate Matter", "source_object_ids": [ 6226 ], "tons_per_year": 0.10317799999999999, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 6230 ], "tons_per_year": 0.10317799999999999, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 6228 ], "tons_per_year": 0.119048, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 6227 ], "tons_per_year": 0.131885, "year": 2024 } ], "emissions_description": "", "facility_match": { "campus_id": "pacific-corporate-park", "campus_name": "Pacific Corporate Park", "confidence": "direct", "county_owners": [ "Pacific-ashburn Campus LLC" ], "county_statuses": [ "under_construction" ], "distance": 105.2, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by PEC data-center permit research." ], "facility_ids": [ "lc-ex-120" ], "method": "point_in_county_parcel", "parcel_ids": [ "044461959000" ] }, "federal_classification": "", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25690/638628512726870000", "permit_year": 2015, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "1520", "T4_rated_c": "0", "Total_Rate": 1520 }, "source": "pec", "source_record_ids": [ 170 ], "tier2": 4, "tier2_description": "emergency electrical generator driven by a diesel engine", "tier4": 0, "tier4_description": "0", "total": 4 }, "identification_method": "PEC data-center permit research", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": null, "issuance_date": null, "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25690/638628512726870000", "program_type": null, "source": "pec" }, "permit_records": [], "public_notices": [], "sources": [ { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28170%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D72346&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "", "status": "Unknown" }, { "address": "22001 Loudoun County Pkwy", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.46920000033894, 39.013099999815076 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Verizon Business Network Services, Inc.", "deq_record_available": true, "deq_registration": "72367", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 6210 ], "tons_per_year": 0.20293, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 6209 ], "tons_per_year": 3.1213, "year": 2024 } ], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "quantum-park", "campus_name": "Quantum Park", "confidence": "direct", "county_owners": [], "county_statuses": [ "proposed" ], "distance": 251.9, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-pl-183" ], "method": "point_in_county_parcel", "parcel_ids": [] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/26107/638639799345030000", "permit_year": 2020, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "14000", "T4_rated_c": "0", "Total_Rate": 14000 }, "source": "pec", "source_record_ids": [ 152 ], "tier2": 7, "tier2_description": "emergency diesel engine gen-sets", "tier4": 0, "tier4_description": "0", "total": 7 }, "identification_method": "DEQ data-center flag", "operator": "Verizon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "72367-4", "deq_registration": "72367", "facility_name": "Verizon Business Network Services, Inc.", "issuance_date": "2020-02-26", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/26107/638639799345030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "72367-4", "deq_registration": "72367", "facility_name": "Verizon Business Network Services, Inc.", "issuance_date": "2020-02-26", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/26107/638639799345030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D72367&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28152%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D72367&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "Synthetic Minor", "status": "Operating" }, { "address": "22810 International Drive", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.42711900026772, 38.98299400027964 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "22810-22860 International Drive LLC", "deq_record_available": true, "deq_registration": "73158", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 11160 ], "tons_per_year": 0.4824628, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 11157 ], "tons_per_year": 6.77508, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 11161 ], "tons_per_year": 0.07665, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 11159 ], "tons_per_year": 0.6357499999999999, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 11158 ], "tons_per_year": 0.09895, "year": 2024 } ], "emissions_description": "telecommunications", "facility_match": { "campus_id": "jk-corporate-campus", "campus_name": "Jk Corporate Campus", "confidence": "direct", "county_owners": [ "Dulles Ncp II LLC", "Dulles Ncp LLC" ], "county_statuses": [ "operational" ], "distance": 101.5, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-057" ], "method": "point_in_county_parcel", "parcel_ids": [ "034357851000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25694/638628516862330000", "permit_year": 2003, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "21000", "T4_rated_c": "0", "Total_Rate": 21000 }, "source": "pec", "source_record_ids": [ 214 ], "tier2": 13, "tier2_description": "diesel genset", "tier4": 0, "tier4_description": "0", "total": 13 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "73158-3", "deq_registration": "73158", "facility_name": "22810-22860 International Drive LLC", "issuance_date": "2003-09-16", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25694/638628516862330000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "73158-3", "deq_registration": "73158", "facility_name": "22810-22860 International Drive LLC", "issuance_date": "2003-09-16", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25694/638628516862330000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D73158&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28214%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D73158&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "Synthetic Minor", "status": "Operating" }, { "address": "45901 Nokes Blvd", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.40975200023725, 39.02312100015584 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "21110 Ridgetop Circle LLC", "deq_record_available": true, "deq_registration": "73160", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 11146 ], "tons_per_year": 0.596985, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 11143 ], "tons_per_year": 5.527355, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 11147 ], "tons_per_year": 0.08928, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 11145 ], "tons_per_year": 0.21680000000000002, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 11144 ], "tons_per_year": 0.162275, "year": 2024 } ], "emissions_description": "Telecommunications/Web", "facility_match": { "campus_id": null, "campus_name": null, "confidence": "unlinked", "distance": null, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Geographic proximity alone does not establish facility identity." ], "facility_ids": [], "method": "nearby_only", "nearby_candidates": [ { "campus_id": "loudoun-tech-center", "campus_name": "Loudoun Tech Center", "distance": 104.1 }, { "campus_id": "loudoun-tech-center-h1", "campus_name": "Loudoun Tech Center H1", "distance": 180.9 }, { "campus_id": "nokes-plaza", "campus_name": "Nokes Plaza", "distance": 294.7 } ], "parcel_ids": [] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25696/638628517902900000", "permit_year": 2019, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "42500", "T4_rated_c": "0", "Total_Rate": 42500 }, "source": "pec", "source_record_ids": [ 157 ], "tier2": 23, "tier2_description": "diesel engine generator sets", "tier4": 0, "tier4_description": "0", "total": 23 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "73160-6", "deq_registration": "73160", "facility_name": "21110 Ridgetop Circle LLC", "issuance_date": "2019-10-30", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25696/638628517902900000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "73160-6", "deq_registration": "73160", "facility_name": "21110 Ridgetop Circle LLC", "issuance_date": "2019-10-30", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25696/638628517902900000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D73160&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28157%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D73160&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "44470 Chilum Pl", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.46098299994233, 39.021945000059176 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Equinix LLC", "deq_record_available": true, "deq_registration": "73199", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 11461 ], "tons_per_year": 0.1056, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 11457 ], "tons_per_year": 0.553914, "year": 2024 }, { "kind": "reported", "pollutant": "PM", "pollutant_name": "Particulate Matter", "source_object_ids": [ 11458 ], "tons_per_year": 0.02376, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 11462 ], "tons_per_year": 0.02376, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 11460 ], "tons_per_year": 0.030624, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 11459 ], "tons_per_year": 0.02904, "year": 2024 } ], "emissions_description": "emergency generators", "facility_match": { "campus_id": "ashburn-corporate-center", "campus_name": "Ashburn Corporate Center", "confidence": "direct", "county_owners": [ "Alshain Ventures LLC", "Fox Properties LLC", "Grizzly Ventures LLC" ], "county_statuses": [ "operational" ], "distance": 119.6, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-024" ], "method": "point_in_county_parcel", "parcel_ids": [ "060182916000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. 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Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28194%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. 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Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28176%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74049&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "45220 Prologis Plaza", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.43653900023833, 38.99141400026265 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Amazon Data Services, Inc. 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Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2877%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74153&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "21955 Loudoun County Parkway", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.46316499968262, 39.011261000044954 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Iskander (LC-1A) Jamshid (LC-1B) Kaveh (LC2) Lohrasp Ventures (LC3)", "deq_record_available": true, "deq_registration": "74155", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16073 ], "tons_per_year": 4.47495, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16070 ], "tons_per_year": 8.56017, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16074 ], "tons_per_year": 0.30243, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16075 ], "tons_per_year": 0.30243, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 16072 ], "tons_per_year": 0.0063825, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16071 ], "tons_per_year": 0.215274, "year": 2024 } ], "emissions_description": "Diesel Engine Generator Sets", "facility_match": { "campus_id": "loudoun-center-worldcom-uunet", "campus_name": "Loudoun Center - Worldcom/uunet", "confidence": "direct", "county_owners": [ "Kaveh Ventures LLC", "Lohrasp Ventures LLC" ], "county_statuses": [ "operational" ], "distance": 100.0, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-055" ], "method": "point_in_county_parcel", "parcel_ids": [ "061275931000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25855/638754663567370000", "permit_year": 2025, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "345048", "T4_rated_c": "225000", "Total_Rate": 570048 }, "source": "pec", "source_record_ids": [ 40 ], "tier2": 116, "tier2_description": "emergency diesel engine gen-sets", "tier4": 75, "tier4_description": "nonemergency diesel engine gen-sets", "total": 191 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74155-4", "deq_registration": "74155", "facility_name": "Iskander (LC-1A) Jamshid (LC-1B) Kaveh (LC2) Lohrasp Ventures (LC3)", "issuance_date": "2025-02-12", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25855/638754663567370000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74155-4", "deq_registration": "74155", "facility_name": "Iskander (LC-1A) Jamshid (LC-1B) Kaveh (LC2) Lohrasp Ventures (LC3)", "issuance_date": "2025-02-12", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25855/638754663567370000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74155&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2840%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74155&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "22262 Cloud Plaza", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.43988099989488, 39.00043599978009 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Sentinel Ashburn Nexus", "deq_record_available": true, "deq_registration": "74156", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16084 ], "tons_per_year": 0.66857625, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16081 ], "tons_per_year": 4.6885435, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16085 ], "tons_per_year": 0.07907625, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16086 ], "tons_per_year": 0.05151, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 16083 ], "tons_per_year": 0.133219175, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16082 ], "tons_per_year": 0.13761575, "year": 2024 } ], "emissions_description": "Diesel Engine Generator Sets", "facility_match": { "campus_id": "broad-run-technology-park", "campus_name": "Broad Run Technology Park", "confidence": "direct", "county_owners": [ "Fr Randolph Drive LLC", "Gi Tc Loudoun LLC", "QTS Investment Properties Ashburn LLC", "Si NVA01, LLC", "Vantage Data Centers VA13 LLC", "Vantage Data Centers VA16 LLC", "Verisign Inc" ], "county_statuses": [ "operational", "under_construction" ], "distance": 18.0, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-044" ], "method": "point_in_county_parcel", "parcel_ids": [ "044282013000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25857/638628779891900000", "permit_year": 2018, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "66000", "T4_rated_c": "0", "Total_Rate": 66000 }, "source": "pec", "source_record_ids": [ 162 ], "tier2": 24, "tier2_description": "emergency diesel engine gen-set", "tier4": 0, "tier4_description": "0", "total": 24 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74156-1", "deq_registration": "74156", "facility_name": "Sentinel Ashburn Nexus", "issuance_date": "2018-11-08", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25857/638628779891900000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74156-1", "deq_registration": "74156", "facility_name": "Sentinel Ashburn Nexus", "issuance_date": "2018-11-08", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25857/638628779891900000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74156&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28162%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74156&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "42254 Thunderball Drive", "city": "Leesburg", "coordinate_source": "deq", "coordinates": [ -77.54153800011433, 39.04436400032998 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Compass IAD Datacenter", "deq_record_available": true, "deq_registration": "74160", "document_reviews": [ { "deq_registration": "74160", "equipment_groups": [ { "count": 5, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 2000, "rating_unit": "ekW", "references": "IADI-II-12-Gen-3A through 3E" }, { "count": 75, "equipment_type": "diesel_generator", "mode": "emergency, previously permitted", "rating_each": 2000, "rating_unit": "ekW", "references": "Equipment Previously Permitted group" } ], "equipment_pdf_page": 5, "in_current_index": true, "limitations": "Equipment tables include authorized or previously permitted units; they do not establish installed equipment, current operation or construction completion. Stated ratings are informational specifications, separate from enforceable permit conditions. The complete document controls.", "permit_date": "2025-11-21", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35469/639105417618500000", "review_method": "PDF text extraction and visual verification of equipment table", "reviewed_at": "2026-09-24T00:42:28+00:00", "reviewer": "Loudoun Data Center Watch", "sha256": "6d5047229ae87ca1e45369e31277032ed80512d061ffd9b0c8fc25e93298bb5e", "summary": "The equipment table lists five units to be constructed and 75 previously permitted units, all emergency diesel generator sets rated at 2,000 ekW each. Previously permitted does not mean installed." } ], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16104 ], "tons_per_year": 1.8398501, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16102 ], "tons_per_year": 10.77262, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16105 ], "tons_per_year": 0.3146739, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16106 ], "tons_per_year": 0.3146739, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16103 ], "tons_per_year": 0.3827115, "year": 2024 } ], "emissions_description": "Diesel Engine Generator Sets", "facility_match": { "campus_id": "true-north", "campus_name": "True North", "confidence": "direct", "county_owners": [ "Compass Datacenters IAD I LLC" ], "county_statuses": [ "under_construction" ], "distance": 345.7, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-089" ], "method": "point_in_county_parcel", "parcel_ids": [ "194103673000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35469/639105417618500000", "permit_year": 2025, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 160000 }, "source": "pec", "source_record_ids": [ 41 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 80 }, "identification_method": "DEQ data-center flag", "operator": "Compass", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74160-3", "deq_registration": "74160", "facility_name": "Compass IAD Datacenter", "issuance_date": "2025-11-21", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35469/639105417618500000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74160-3", "deq_registration": "74160", "facility_name": "Compass IAD Datacenter", "issuance_date": "2025-11-21", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35469/639105417618500000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74160&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2841%2C108%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74160&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "45194 Vantage Data Plaza", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.43922481920741, 39.001873783898404 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Vantage Data Centers VA11, VA12, VA13, VA14, & VA15", "deq_record_available": true, "deq_registration": "74162", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16118 ], "tons_per_year": 2.601886, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16115 ], "tons_per_year": 5.503295, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16119 ], "tons_per_year": 0.2202221, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16120 ], "tons_per_year": 0.2202221, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 16117 ], "tons_per_year": 0.0040031, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16116 ], "tons_per_year": 0.39985205, "year": 2024 } ], "emissions_description": "Emergency diesel engine generators", "facility_match": { "campus_id": "ashburn-nexus-project-viper", "campus_name": "Ashburn Nexus/project Viper", "confidence": "direct", "county_owners": [ "Vantage Data Centers VA11 LLC" ], "county_statuses": [ "operational" ], "distance": 162.0, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-053" ], "method": "point_in_county_parcel", "parcel_ids": [ "044288975000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25863/638628785479200000", "permit_year": 2022, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "333750", "T4_rated_c": "0", "Total_Rate": 333750 }, "source": "pec", "source_record_ids": [ 137 ], "tier2": 123, "tier2_description": "emergency diesel engine gen-sets", "tier4": 0, "tier4_description": "0", "total": 123 }, "identification_method": "DEQ data-center flag", "operator": "Vantage", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74162-5", "deq_registration": "74162", "facility_name": "Vantage Data Centers VA11, VA12, VA13, VA14, & VA15", "issuance_date": "2022-04-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25863/638628785479200000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74162-5", "deq_registration": "74162", "facility_name": "Vantage Data Centers VA11, VA12, VA13, VA14, & VA15", "issuance_date": "2022-04-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25863/638628785479200000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74162&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28137%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74162&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "20491 Goose Landing Ln", "city": "Leesburg", "coordinate_source": "deq", "coordinates": [ -77.53916800005307, 39.05055699990935 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Hayden Technologies, LLC.", "deq_record_available": true, "deq_registration": "74163", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16141 ], "tons_per_year": 0.1551755, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16138 ], "tons_per_year": 0.402937, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16142 ], "tons_per_year": 3.1216649999999997, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16143 ], "tons_per_year": 1.881665, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 16140 ], "tons_per_year": 0.0002580319, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16139 ], "tons_per_year": 0.0189842, "year": 2024 } ], "emissions_description": "Diesel Engine Generator Sets", "facility_match": { "campus_id": "project-aspen", "campus_name": "Project Aspen", "confidence": "direct", "county_owners": [ "Hayden Technologies LLC" ], "county_statuses": [ "operational" ], "distance": 130.5, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-136" ], "method": "point_in_county_parcel", "parcel_ids": [ "194498227000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25865/638628786015470000", "permit_year": 2024, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "309305", "T4_rated_c": "81250", "Total_Rate": 390555 }, "source": "pec", "source_record_ids": [ 79 ], "tier2": 124, "tier2_description": "Emergency Diesel Engine Generator Sets", "tier4": 130, "tier4_description": "NonEmergency Diesel Engine Generator Sets", "total": 254 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74163-9", "deq_registration": "74163", "facility_name": "Hayden Technologies, LLC", "issuance_date": "2025-04-30", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25865/638816888857770000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74163-9", "deq_registration": "74163", "facility_name": "Hayden Technologies, LLC", "issuance_date": "2025-04-30", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25865/638816888857770000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74163&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2879%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74163&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "45905 Maries Road", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.41267399976924, 39.02227100004698 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "CyrusOne Northern Virginia Data Center - Maries Road", "deq_record_available": true, "deq_registration": "74164", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16158 ], "tons_per_year": 1.76030395, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16156 ], "tons_per_year": 10.14829185, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16159 ], "tons_per_year": 0.1327333, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16160 ], "tons_per_year": 0.1327333, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16157 ], "tons_per_year": 0.313095, "year": 2024 } ], "emissions_description": "CI RICE (diese engine generator sets)", "facility_match": { "campus_id": "tall-oaks", "campus_name": "Tall Oaks", "confidence": "direct", "county_owners": [ "C1 Northern Virginia - Sterling VIII LLC", "Maries Tech Park II LLC", "Maries Tech Park LLC" ], "county_statuses": [ "operational", "under_construction" ], "distance": 130.0, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-040" ], "method": "point_in_county_parcel", "parcel_ids": [ "030296913000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25867/638628786473030000", "permit_year": 2022, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "49500", "T4_rated_c": "0", "Total_Rate": 49500 }, "source": "pec", "source_record_ids": [ 138 ], "tier2": 21, "tier2_description": "emergency diesel engine gen-sets", "tier4": 0, "tier4_description": "0", "total": 21 }, "identification_method": "DEQ data-center flag", "operator": "CyrusOne", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74164-3", "deq_registration": "74164", "facility_name": "CyrusOne Northern Virginia Data Center - Maries Road", "issuance_date": "2022-10-03", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25867/638628786473030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74164-3", "deq_registration": "74164", "facility_name": "CyrusOne Northern Virginia Data Center - Maries Road", "issuance_date": "2022-10-03", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25867/638628786473030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74164&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28138%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74164&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "Synthetic Minor", "status": "Operating" }, { "address": "21890 Uunet Drive", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.47168500002793, 39.01371200006481 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Aligned Energy Data Centers (Ashburn), LLC", "deq_record_available": true, "deq_registration": "74169", "document_reviews": [ { "deq_registration": "74169", "equipment_groups": [ { "count": 4, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 2500, "rating_unit": "ekW", "references": "GEN65 through GEN68" }, { "count": 40, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 3000, "rating_unit": "ekW", "references": "GEN69 through GEN108" }, { "count": 64, "equipment_type": "diesel_generator", "mode": "emergency, previously permitted", "rating_each": 2250, "rating_unit": "ekW", "references": "GEN1 through GEN64" }, { "count": 2, "equipment_type": "diesel_generator", "mode": "emergency, previously permitted", "rating_each": 1000, "rating_unit": "ekW", "references": "LSGEN-1 and LSGEN-2" } ], "equipment_pdf_page": 5, "in_current_index": true, "limitations": "Equipment tables include authorized or previously permitted units; they do not establish installed equipment, current operation or construction completion. Stated ratings are informational specifications, separate from enforceable permit conditions. The complete document controls.", "pec_registration_correction": { "corrected_registration": "74169", "original_registration": "74196", "registration_pdf_page": 3, "source_record_id": 143 }, "permit_date": "2022-07-18", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25926/638633793013470000", "review_method": "PDF text extraction and visual verification of equipment table", "reviewed_at": "2026-09-24T00:42:28+00:00", "reviewer": "Loudoun Data Center Watch", "sha256": "641777eba2023e18897eef2c8bec205551b3482c0a8fa0833c911b68b71787fa", "summary": "This document identifies registration 74169 and lists 110 emergency diesel generator sets. PEC row 143 links to this same PDF but has registration 74196, which DEQ assigns to a rail yard. The PEC registration is corrected only for this evidenced source row; its original value remains in the review queue." } ], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 16196 ], "tons_per_year": 2.835263, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 16194 ], "tons_per_year": 18.1434665, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 16197 ], "tons_per_year": 0.25149299999999997, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 16198 ], "tons_per_year": 0.25149299999999997, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 16195 ], "tons_per_year": 0.48024, "year": 2024 } ], "emissions_description": "Diesel Engine Generator Sets (CI RICE)", "facility_match": { "campus_id": "quantum-park-verizon-campus", "campus_name": "Quantum Park (Verizon Campus)", "confidence": "direct", "county_owners": [ "Aligned Energy Data Centers (Ashburn)\\ Propco LLC", "Aligned Energy Data Centers IAD Propco LLC", "Equinix LLC" ], "county_statuses": [ "operational" ], "distance": 150.0, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-048" ], "method": "point_in_county_parcel", "parcel_ids": [ "061355894000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. 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Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28143%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. 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Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2848%2C113%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74234&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "21745 Beaumeade Circle", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.45781799983777, 39.01819899974533 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Cologix ASH1", "deq_record_available": true, "deq_registration": "74235", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 17184 ], "tons_per_year": 0.00012085620000000001, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 17180 ], "tons_per_year": 0.000385832, "year": 2024 }, { "kind": "reported", "pollutant": "PM", "pollutant_name": "Particulate Matter", "source_object_ids": [ 17181 ], "tons_per_year": 2.22705e-05, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 17185 ], "tons_per_year": 2.3972700000000002e-05, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 17186 ], "tons_per_year": 2.3972700000000002e-05, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 17183 ], "tons_per_year": 3.475e-07, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 17182 ], "tons_per_year": 7.43294e-05, "year": 2024 } ], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "beaumeade", "campus_name": "Beaumeade", "confidence": "direct", "county_owners": [ "21673 Beaumeade Circle LLC", "Arep Beaumeade LLC", "Ashburn Data Property Owner LP", "Bcore Copt DC-15 LLC", "Beaumeade DC Building LLC", "Beaumeade Technology Partners LLC", "Digital Filigree LLC", "Equinix LLC", "Equinix Rp II LLC", "Monterey DC Assets LLC", "NTT Global Data Centers Americas Inc", "Ragingwire Data Centers Inc" ], "county_statuses": [ "operational", "proposed", "under_construction" ], "distance": 99.5, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-112" ], "method": "point_in_county_parcel", "parcel_ids": [ "060189720000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25974/638889504246870000", "permit_year": 2025, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 168750 }, "source": "pec", "source_record_ids": [ 49 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 75 }, "identification_method": "DEQ data-center flag", "operator": "Cologix", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74235-2", "deq_registration": "74235", "facility_name": "Cologix ASH1", "issuance_date": "2025-07-23", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25974/638889504246870000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74235-2", "deq_registration": "74235", "facility_name": "Cologix ASH1", "issuance_date": "2025-07-23", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25974/638889504246870000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74235&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2849%2C145%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74235&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "22435 Glenn Drive", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.43000099961674, 38.9983360002755 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Vantage Data Centers VA2 LLC", "deq_record_available": true, "deq_registration": "74242", "document_reviews": [ { "deq_registration": "74242", "equipment_groups": [ { "count": 40, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 2750, "rating_unit": "ekW", "references": "EG-10 through EG-49" }, { "count": 2, "equipment_type": "diesel_generator", "mode": "black-start", "rating_each": 2750, "rating_unit": "ekW", "references": "EP-BS1 and EP-BS2" }, { "count": 9, "equipment_type": "diesel_generator", "mode": "emergency, previously permitted", "rating_each": 2750, "rating_unit": "ekW", "references": "EG-01 through EG-09" }, { "count": 8, "equipment_type": "gas_turbine", "mode": "natural-gas turbine", "rating_each": 16.5, "rating_unit": "MWe", "references": "TG-01 through TG-08" } ], "equipment_pdf_page": 5, "in_current_index": true, "limitations": "Equipment tables include authorized or previously permitted units; they do not establish installed equipment, current operation or construction completion. Stated ratings are informational specifications, separate from enforceable permit conditions. The complete document controls.", "permit_date": "2023-09-15", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25986/638633875365530000", "review_method": "PDF text extraction and visual verification of equipment table", "reviewed_at": "2026-09-24T00:42:28+00:00", "reviewer": "Loudoun Data Center Watch", "sha256": "d8d8738d431e80cc5dacac5767bb91d070b60bd374f161c642b7001a8ef9ee04", "summary": "The equipment table lists 49 emergency diesel generator sets, two black-start diesel generator sets and eight natural-gas turbines. PEC combines all 59 units and places the turbines in its Tier 4 column. The turbines are not a Tier 4 engine count." } ], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 17749 ], "tons_per_year": 14.051683515, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 17745 ], "tons_per_year": 21.953925825, "year": 2024 }, { "kind": "reported", "pollutant": "PM", "pollutant_name": "Particulate Matter", "source_object_ids": [ 17746 ], "tons_per_year": 15.124931245, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 17750 ], "tons_per_year": 15.139586645000001, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 17751 ], "tons_per_year": 15.139586645000001, "year": 2024 }, { "kind": "reported", "pollutant": "SO2", "pollutant_name": "Sulfur Dioxide", "source_object_ids": [ 17748 ], "tons_per_year": 5.09779012, "year": 2024 }, { "kind": "reported", "pollutant": "VOC", "pollutant_name": "Volatile Organic Compounds", "source_object_ids": [ 17747 ], "tons_per_year": 11.74004269, "year": 2024 } ], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "vantage-data-center-sterling", "campus_name": "Vantage Data Center - Sterling", "confidence": "direct", "county_owners": [ "Vantage Data Centers VA2 LLC" ], "county_statuses": [ "operational" ], "distance": 83.6, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-088" ], "method": "point_in_county_parcel", "parcel_ids": [ "032155119000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "equipment_type_conflict": true, "note": "PEC combines different equipment types. Its total and Tier 4 count are withheld; see raw descriptions and the permit PDF. Capacity units are unverified.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25986/638633875365530000", "permit_year": 2023, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "140250", "T4_rated_c": "132", "Total_Rate": 140382 }, "source": "pec", "source_record_ids": [ 114 ], "tier2": 51, "tier2_description": "Start Diesel Engine Generator Sets", "tier4": null, "tier4_description": "simple cycle combustion natural gas fired turbines", "total": null }, "identification_method": "DEQ data-center flag", "operator": "Vantage", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74242-2", "deq_registration": "74242", "facility_name": "Vantage Data Centers VA2 LLC", "issuance_date": "2023-09-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25986/638633875365530000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74242-2", "deq_registration": "74242", "facility_name": "Vantage Data Centers VA2 LLC", "issuance_date": "2023-09-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25986/638633875365530000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74242&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%28114%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74242&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "21320 Beaumeade Circle", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.45206599993696, 39.016774999859216 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Amazon Data Services Inc IAD-169/179", "deq_record_available": true, "deq_registration": "74244", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 1099 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 1097 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 1100 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 1101 ], "tons_per_year": 0.0, "year": 2024 } ], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "beaumeade", "campus_name": "Beaumeade", "confidence": "direct", "county_owners": [ "21673 Beaumeade Circle LLC", "Arep Beaumeade LLC", "Ashburn Data Property Owner LP", "Bcore Copt DC-15 LLC", "Beaumeade DC Building LLC", "Beaumeade Technology Partners LLC", "Digital Filigree LLC", "Equinix LLC", "Equinix Rp II LLC", "Monterey DC Assets LLC", "NTT Global Data Centers Americas Inc", "Ragingwire Data Centers Inc" ], "county_statuses": [ "operational", "proposed", "under_construction" ], "distance": 18.9, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-066" ], "method": "point_in_county_parcel", "parcel_ids": [ "061407107000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25632/638627832777030000", "permit_year": 2024, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "95200", "T4_rated_c": "0", "Total_Rate": 95200 }, "source": "pec", "source_record_ids": [ 92 ], "tier2": 40, "tier2_description": "emergency diesel engine gen-set", "tier4": 0, "tier4_description": "0", "total": 40 }, "identification_method": "DEQ data-center flag", "operator": "Amazon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74244-2", "deq_registration": "74244", "facility_name": "Amazon Data Services Inc IAD-169/179", "issuance_date": "2024-08-27", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25632/638627832777030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74244-2", "deq_registration": "74244", "facility_name": "Amazon Data Services Inc IAD-169/179", "issuance_date": "2024-08-27", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/25632/638627832777030000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74244&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2892%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74244&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "Relocation Drive", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.44077162560018, 38.98833721319172 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Aligned Data Centers IAD03", "deq_record_available": true, "deq_registration": "74247", "document_reviews": [], "emissions": [ { "kind": "reported", "pollutant": "CO", "pollutant_name": "Carbon Monoxide", "source_object_ids": [ 17773 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "NOX", "pollutant_name": "Nitrogen Oxide", "source_object_ids": [ 17771 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "PM 10", "pollutant_name": "Particulate Matter 10", "source_object_ids": [ 17774 ], "tons_per_year": 0.0, "year": 2024 }, { "kind": "reported", "pollutant": "PM 2.5", "pollutant_name": "Particulate Matter 2.5", "source_object_ids": [ 17775 ], "tons_per_year": 0.0, "year": 2024 } ], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "aligned-energy", "campus_name": "Aligned Energy", "confidence": "direct", "county_owners": [ "Aligned Data Centers Relo Propco LLC", "Aligned Energy" ], "county_statuses": [ "operational" ], "distance": 21.8, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-003" ], "method": "point_in_county_parcel", "parcel_ids": [ "045279612000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. 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Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/28094/638778027138400000", "permit_year": 2025, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": "9000", "T4_rated_c": "456500", "Total_Rate": 465500 }, "source": "pec", "source_record_ids": [ 55 ], "tier2": 7, "tier2_description": "emergency diesel-fired engine gen-sets", "tier4": 166, "tier4_description": "non emergency diesel-fired engine gen-sets", "total": 173 }, "identification_method": "DEQ data-center flag", "operator": "Amazon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74301-1", "deq_registration": "74301", "facility_name": "Amazon Data Services Inc - IAD-667, IAD-668, IAD-669, IAD-670, and IAD-671", "issuance_date": "2025-03-12", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/28094/638778027138400000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74301-1", "deq_registration": "74301", "facility_name": "Amazon Data Services Inc - IAD-667, IAD-668, IAD-669, IAD-670, and IAD-671", "issuance_date": "2025-03-12", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/28094/638778027138400000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74301&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2855%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74301&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Operating" }, { "address": "45130 Waxpool Road", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.44704817066, 39.00447684986909 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index" ], "deq_data_center_flag": "Y", "deq_facility_name": "Amazon Data Services Inc - IAD-243/244/290/291/292", "deq_record_available": true, "deq_registration": "74302", "document_reviews": [ { "deq_registration": "74302", "equipment_groups": [ { "count": 52, "equipment_type": "diesel_generator", "mode": "non-emergency", "rating_each": 2750, "rating_unit": "ekW", "references": "1 through 52" }, { "count": 2, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 750, "rating_unit": "ekW", "references": "53 and 54" }, { "count": 96, "equipment_type": "diesel_generator", "mode": "non-emergency", "rating_each": 2750, "rating_unit": "ekW", "references": "55 through 150" }, { "count": 3, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 1000, "rating_unit": "ekW", "references": "151 through 153" }, { "count": 2, "equipment_type": "diesel_generator", "mode": "emergency", "rating_each": 2000, "rating_unit": "ekW", "references": "T1 and T2" } ], "equipment_pdf_page": 5, "in_current_index": true, "limitations": "Equipment tables include authorized or previously permitted units; they do not establish installed equipment, current operation or construction completion. Stated ratings are informational specifications, separate from enforceable permit conditions. The complete document controls.", "permit_date": "2026-07-15", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/37399/639201548771970000", "review_method": "PDF text extraction and visual verification of equipment table", "reviewed_at": "2026-09-24T00:42:28+00:00", "reviewer": "Loudoun Data Center Watch", "sha256": "9f69a36828bee05940b24f8a2a0890485387b4da27f191c34e4c6edea55b2532", "summary": "The equipment table lists 155 diesel generator sets: 148 non-emergency units with SCR and catalyzed particulate filters, and seven emergency units. Different operating modes must remain separate." } ], "emissions": [], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "pacific-corporate-park", "campus_name": "Pacific Corporate Park", "confidence": "direct", "county_owners": [ "Pacific-ashburn Campus LLC" ], "county_statuses": [ "under_construction" ], "distance": 45.6, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index." ], "facility_ids": [ "lc-ex-120" ], "method": "point_in_county_parcel", "parcel_ids": [ "044461959000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": null, "permit_year": null, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": null, "T4_rated_c": null, "Total_Rate": null }, "source": null, "source_record_ids": [], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": null }, "identification_method": "DEQ data-center flag", "operator": "Amazon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74302-1", "deq_registration": "74302", "facility_name": "Amazon Data Services Inc - IAD-243/244/290/291/292", "issuance_date": "2026-07-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/37399/639201548771970000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74302-1", "deq_registration": "74302", "facility_name": "Amazon Data Services Inc - IAD-243/244/290/291/292", "issuance_date": "2026-07-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/37399/639201548771970000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74302&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74302&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "45831 Maries Road", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.4146685202114, 39.02257701069906 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "MECP1 Ashburn 2 LLC", "deq_record_available": true, "deq_registration": "74306", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "45865-maries-road", "campus_name": "45865 Maries Road", "confidence": "direct", "county_owners": [ "Mecp 1 Ashburn 2 LLC" ], "county_statuses": [ "under_construction" ], "distance": 82.4, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-106" ], "method": "point_in_county_parcel", "parcel_ids": [ "030292034000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/32401/638989963110000000", "permit_year": 2025, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 126000 }, "source": "pec", "source_record_ids": [ 56 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 42 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74306-2", "deq_registration": "74306", "facility_name": "MECP1 Ashburn 2, LLC", "issuance_date": "2025-09-18", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/32401/638989963110000000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74306-2", "deq_registration": "74306", "facility_name": "MECP1 Ashburn 2, LLC", "issuance_date": "2025-09-18", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/32401/638989963110000000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74306&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2856%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74306&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "21780 Filigree Court", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.45643166399577, 39.01365790327659 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Digital Filigree LLC", "deq_record_available": true, "deq_registration": "74308", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Engine Generator Sets", "facility_match": { "campus_id": "beaumeade", "campus_name": "Beaumeade", "confidence": "direct", "county_owners": [ "21673 Beaumeade Circle LLC", "Arep Beaumeade LLC", "Ashburn Data Property Owner LP", "Bcore Copt DC-15 LLC", "Beaumeade DC Building LLC", "Beaumeade Technology Partners LLC", "Digital Filigree LLC", "Equinix LLC", "Equinix Rp II LLC", "Monterey DC Assets LLC", "NTT Global Data Centers Americas Inc", "Ragingwire Data Centers Inc" ], "county_statuses": [ "operational", "proposed", "under_construction" ], "distance": 42.8, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-122" ], "method": "point_in_county_parcel", "parcel_ids": [ "061394321000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35463/639105417610630000", "permit_year": 2026, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 88000 }, "source": "pec", "source_record_ids": [ 16 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 30 }, "identification_method": "DEQ data-center flag", "operator": "Digital Realty", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74308-1", "deq_registration": "74308", "facility_name": "Digital Filigree LLC", "issuance_date": "2026-03-23", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35463/639105417610630000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74308-1", "deq_registration": "74308", "facility_name": "Digital Filigree LLC", "issuance_date": "2026-03-23", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35463/639105417610630000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74308&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2816%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74308&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "22425 Sous Vide Lane", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.44548412290196, 38.995628896860126 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index" ], "deq_data_center_flag": "Y", "deq_facility_name": "1501 Moran Road Development Owner LLC", "deq_record_available": true, "deq_registration": "74315", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Emergency Generators", "facility_match": { "campus_id": "1501-moran-road", "campus_name": "1501 Moran Road", "confidence": "direct", "county_owners": [ "1501 Moran Road Development Owner LLC" ], "county_statuses": [ "under_construction" ], "distance": 70.7, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index." ], "facility_ids": [ "lc-ex-124" ], "method": "point_in_county_parcel", "parcel_ids": [ "045465016000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": null, "permit_year": null, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": null, "T4_rated_c": null, "Total_Rate": null }, "source": null, "source_record_ids": [], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": null }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74315-1", "deq_registration": "74315", "facility_name": "1501 Moran Road Development Owner, LLC", "issuance_date": "2025-04-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/28686/638803848078830000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74315-1", "deq_registration": "74315", "facility_name": "1501 Moran Road Development Owner, LLC", "issuance_date": "2025-04-15", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/28686/638803848078830000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74315&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74315&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "19560 Hyperspace Lane", "city": "Ashburn", "coordinate_source": "deq", "coordinates": [ -77.50750632001048, 39.0743371997707 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Belmont Innovation Campus", "deq_record_available": true, "deq_registration": "74321", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "belmont-innovation-station", "campus_name": "Belmont Innovation Station", "confidence": "direct", "county_owners": [ "Loudoun Prop 7 LLC" ], "county_statuses": [ "under_construction" ], "distance": 198.1, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-123" ], "method": "point_in_county_parcel", "parcel_ids": [ "113167503000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35462/639105417609370000", "permit_year": 2026, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 336000 }, "source": "pec", "source_record_ids": [ 17 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 96 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74321-1", "deq_registration": "74321", "facility_name": "Belmont Innovation Campus", "issuance_date": "2026-01-28", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35462/639105417609370000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74321-1", "deq_registration": "74321", "facility_name": "Belmont Innovation Campus", "issuance_date": "2026-01-28", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35462/639105417609370000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74321&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2817%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74321&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "43975 Light Speed Plaza", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.49422705517135, 38.98111326772862 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Amazon Data Services Inc IAD-180, IAD-181, IAD-182, & IAD-183", "deq_record_available": true, "deq_registration": "74323", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Emergency Generator Sets", "facility_match": { "campus_id": "northwoods", "campus_name": "Northwoods", "confidence": "direct", "county_owners": [ "Amazon Data Services Inc" ], "county_statuses": [ "under_construction" ], "distance": 133.4, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-103" ], "method": "point_in_county_parcel", "parcel_ids": [ "122207249000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35461/639105417608200000", "permit_year": 2026, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 352850 }, "source": "pec", "source_record_ids": [ 18 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 134 }, "identification_method": "DEQ data-center flag", "operator": "Amazon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74323-2", "deq_registration": "74323", "facility_name": "Amazon Data Services Inc IAD-180, IAD-181, IAD-182, & IAD-183", "issuance_date": "2026-03-16", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35461/639105417608200000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74323-2", "deq_registration": "74323", "facility_name": "Amazon Data Services Inc IAD-180, IAD-181, IAD-182, & IAD-183", "issuance_date": "2026-03-16", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35461/639105417608200000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74323&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2818%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74323&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "44595 Low Latency Lane", "city": "Sterling", "coordinate_source": "deq", "coordinates": [ -77.45972389429065, 38.99599452085337 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "SDC Ashburn I - SE Parcel Campus", "deq_record_available": true, "deq_registration": "74335", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "project-nova", "campus_name": "Project Nova", "confidence": "direct", "county_owners": [ "Sdc Ashburn Alpha I LLC", "Sdc Ashburn I LLC", "Stack Broad Run Holdings LLC" ], "county_statuses": [ "operational", "under_construction" ], "distance": 99.5, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-128" ], "method": "point_in_county_parcel", "parcel_ids": [ "063479549000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35457/639105417603370000", "permit_year": 2026, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 263000 }, "source": "pec", "source_record_ids": [ 22 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 76 }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74335-1", "deq_registration": "74335", "facility_name": "SDC Ashburn I - SE Parcel Campus", "issuance_date": "2026-03-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35457/639105417603370000", "program_type": "Article 6 mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74335-1", "deq_registration": "74335", "facility_name": "SDC Ashburn I - SE Parcel Campus", "issuance_date": "2026-03-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35457/639105417603370000", "program_type": "Article 6 mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74335&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2822%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74335&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "42090 Reeds Farm Lane", "city": "Stone Ridge", "coordinate_source": "deq", "coordinates": [ -77.54898281498093, 38.94503688498242 ], "data_center_evidence": [ "DEQ data-center flag", "DEQ issued-data-center index", "PEC data-center permit research" ], "deq_data_center_flag": "Y", "deq_facility_name": "Amazon Data Services Inc IAD-170", "deq_record_available": true, "deq_registration": "74337", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "inova-health-system-plan", "campus_name": "Inova Health System Plan", "confidence": "direct", "county_owners": [ "Amazon Data Services, Inc" ], "county_statuses": [ "under_construction" ], "distance": 96.7, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag, DEQ issued-data-center index, PEC data-center permit research." ], "facility_ids": [ "lc-ex-121" ], "method": "point_in_county_parcel", "parcel_ids": [ "203170856000" ] }, "federal_classification": "Synthetic Minor", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35456/639105417601700000", "permit_year": 2026, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": " ", "T4_rated_c": " ", "Total_Rate": 111400 }, "source": "pec", "source_record_ids": [ 23 ], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": 41 }, "identification_method": "DEQ data-center flag", "operator": "Amazon", "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": "74337-1", "deq_registration": "74337", "facility_name": "Amazon Data Services Inc IAD-170", "issuance_date": "2026-03-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35456/639105417601700000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" }, "permit_records": [ { "application_number": "74337-1", "deq_registration": "74337", "facility_name": "Amazon Data Services Inc IAD-170", "issuance_date": "2026-03-20", "locality": "Loudoun Co.", "permit_url": "https://www.deq.virginia.gov/home/showpublisheddocument/35456/639105417601700000", "program_type": "Article 6 - mNSR", "regional_office": "Northern", "source": "deq_issued_index" } ], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74337&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "deq_issued_index", "note": "Issued permit applications joined by registration; index dated 2026-09-21.", "publisher": "Virginia DEQ", "url": "https://www.deq.virginia.gov/news-info/shortcuts/permits/air/issued-air-permits-for-data-centers" }, { "id": "pec_permits", "note": "Generator information extracted by PEC from DEQ permit documents. Latest permit year selected; revisions are never summed.", "publisher": "Piedmont Environmental Council", "url": "https://services3.arcgis.com/mTaShYKffyWc5uRb/arcgis/rest/services/AirPermits_07232026/FeatureServer/18/query?where=FID+IN+%2823%29&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74337&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "80% Synthetic Minor", "status": "Planned" }, { "address": "42111 Cochran Mill Road", "city": "Leesburg", "coordinate_source": "deq", "coordinates": [ -77.52604118470755, 39.07427040879486 ], "data_center_evidence": [ "DEQ data-center flag" ], "deq_data_center_flag": "Y", "deq_facility_name": "Twin Creeks Campus", "deq_record_available": true, "deq_registration": "74351", "document_reviews": [], "emissions": [], "emissions_description": "Diesel Engine Driven Generator Sets", "facility_match": { "campus_id": "stpl-2022-0040", "campus_name": "STPL-2022-0040", "confidence": "direct", "county_owners": [], "county_statuses": [ "proposed" ], "distance": 584.4, "distance_basis": "DEQ/PEC point to county parcel centroid", "distance_units": "metres", "evidence": [ "Source air-site point is inside the county data-center parcel outline.", "Data-center identity is independently supported by DEQ data-center flag." ], "facility_ids": [ "lc-pl-211" ], "method": "point_in_county_parcel", "parcel_ids": [] }, "federal_classification": "", "generators": { "capacity_unit": null, "capacity_units_verified": false, "note": "PEC-derived from DEQ permit documents. Counts describe documented equipment, not operation. Capacity units are not verified; no conversion or capacity total is published.", "permit_url": null, "permit_year": null, "rated_capacity": null, "rated_capacity_raw": { "T2_rated_c": null, "T4_rated_c": null, "Total_Rate": null }, "source": null, "source_record_ids": [], "tier2": null, "tier2_description": null, "tier4": null, "tier4_description": null, "total": null }, "identification_method": "DEQ data-center flag", "operator": null, "operator_method": "Name classification by Loudoun Data Center Watch; does not establish property ownership.", "permit": { "application_number": null, "issuance_date": null, "permit_url": null, "program_type": null, "source": null }, "permit_records": [], "public_notices": [], "sources": [ { "id": "deq_air_sites", "note": "Official air-site attributes and operating/planned status.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/294/query?where=PLA_REG_NUM%3D74351&outFields=%2A&returnGeometry=false&f=pjson" }, { "id": "county_gis", "note": "County campus grouping and parcel identification; county snapshot 2026-10-01.", "publisher": "Loudoun County GIS", "url": "https://geohub-loudoungis.opendata.arcgis.com/" }, { "id": "ldcw_matching", "note": "Registration normalization, matching, confidence and calculations.", "publisher": "Loudoun Data Center Watch", "url": "https://loudoundatacenterwatch.org/data-sources.html#air-methodology" }, { "id": "deq_emissions", "note": "Reported emissions inventory in tons per year, not permitted limits. No rows means no inventory records in this snapshot, not zero emissions.", "publisher": "Virginia DEQ", "url": "https://gisdata.deq.virginia.gov/arcgis/rest/services/public/EDMA/MapServer/292/query?where=PLA_REG_NUM%3D74351&outFields=%2A&returnGeometry=false&f=pjson" } ], "state_classification": "", "status": "Planned" } ], "summary": { "backup_generators_documented": 5699, "deq_data_center_air_sites": 86, "direct_matches": 66, "facilities_with_tier4_information": 60, "issued_permit_records": 91, "likely_matches": 0, "matched_county_campuses": 50, "matched_registrations": 66, "operating_air_sites": 74, "planned_air_sites": 13, "registrations": 89, "registrations_with_generator_counts": 83, "registrations_with_reported_emissions": 76, "reported_emissions_rows": 420, "unlinked": 23 } }