Holtsville
Holtsville is a 567 MW oil-fired power plant in Suffolk County, New York, operated by National Grid Generation LLC. EIA-860M lists 10 generating units here, inside NYISO. Its units entered service between 1974 and 1975.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 567 MW
- 532.3 MW net summer
- Generating units
- 10
- In service
- 1974–1975
- EIA plant ID
- 8007
Where it is
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- County
- Suffolk County, New York
- Coordinates
- 40.817, -73.0663
- Balancing authority
- NYIS
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- National Grid Generation LLC
- Primary energy source
- Petroleum
- Technologies
- Petroleum Liquids
- Status
- Operating
Holtsville: FAQ
- Where is Holtsville?
- In Suffolk County, New York (NY). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Holtsville?
- 567 MW of nameplate capacity across 10 units, as of the EIA-860M release for 2026-07.
- Who owns Holtsville?
- EIA-860M names National Grid Generation LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Holtsville LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — National Grid Generation LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Holtsville LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Holtsville still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.