Grahamsville
Grahamsville is a 18 MW hydroelectric power plant in Sullivan County, New York, operated by New York Power Authority. EIA-860M lists 1 generating unit here, inside NYISO. Its unit entered service in 1956.
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
- 18 MW
- 18 MW net summer
- Generating units
- 1
- In service
- 1956
- EIA plant ID
- 2627
Where it is
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- County
- Sullivan County, New York
- Coordinates
- 41.8592, -74.5106
- Balancing authority
- NYIS
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- New York Power Authority
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Grahamsville: FAQ
- Where is Grahamsville?
- In Sullivan 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 Grahamsville?
- 18 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Grahamsville?
- EIA-860M names New York Power Authority 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 Grahamsville LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — New York Power Authority 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 "Grahamsville LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Grahamsville still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.