Grahamsville — Plant Summary
- EIA Plant ID
- 2627
- Capacity
- 18 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Sullivan, NY
- Operating Since
- 1956
- Generators
- 1
- Operator
- New York Power Authority
- Parent Company
- —
- Annual Generation
- 82,348 MWh
- Capacity Factor
- 52.3%
- Balancing Authority
- New York Independent System Operator
- ISO/RTO
- NYISO
- NERC Region
- NPCC
Grahamsville
OperatingHydro
Ranked #24 of 165 Hydro plants in NY#499 of 1454 nationally
18 MW Hydro operating in Sullivan, NY — New York Independent System Operator
EIAWD
18 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1956
Operating Since
Location
Coordinates
41.8595, -74.5103
County
Sullivan, NY
Nearby Plants
- West Delaware Tunnel PlantHydro7.5 MW · 0.7 km
- NeversinkHydro25 MW · 3.3 km
- Reisender SolarSolar2 MW · 12.6 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | New York Power Authority | — | — |
| Owner(s) | City of New York | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
Grahamsville is a hydroelectric power plant located in Sullivan County, New York. The plant has a total capacity of 18 MW and began operating in 1956. It is owned and operated by the New York Power Authority. The plant utilizes a single generator and its primary fuel source is water (WAT).
In the most recent year with available data, Grahamsville generated 82,348 MWh of electricity, achieving a capacity factor of 52.3%. The plant operates within the New York Independent System Operator (NYISO) balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. Grahamsville ranks as the 24th largest power plant in New York out of 165 facilities, and it holds the 513th position nationally among 1464 power plants.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
New York Independent System Operator
Grid Voltage
69 kV
Regulatory Status
RE
Entity Type
State
Sector
Electric Utility
Generation
6.2K MWh
Latest Month
82.3K MWh
Annual Generation
52.3%
Capacity Factor
Jan 2022 – Dec 2024
Financial Data
No financial data available for this plant.
Pricing & Market Data
MEDIUM confidencePoint of Interconnection
Nearest Substation
EAST___DELAWARE_HYD
Substation Distance
< 10 km
Coord Source
NYISO direct
Market Position
ISO/RTO Market
NYISO
LMP Node
—
Pricing Hub
NYISO Zone G
Node Source
Shared substation inference
Substation identified. Node ID not yet resolved against ISO roster.
23607Nearby ISO Node
323627Substation
News & Articles (2)Beta
Regulatory·permitting
New York Power Authority; Notice of Availability of Environmental Assessment
New York Power Authority (operator)
Federal Register (FERC)·1 weeks ago
Industry·technology
Should Croton Dam Park have hydropower?
Is hydropower feasible at the Croton Dam Park? Yes! But, a traditional hydroelectric unit mounted to harvest the water as it falls is not likely.
Patch·12 years ago
Last updated 2026-03-25
View all articles