Grahamsville
Sullivan County, New York · EIA plant ID 2627 · Operator: New York Power Authority
Nameplate18MWSummer 18 MW
Generators1in service
Net generation85GWh12 mo to Dec 2025
Capacity factor54%hydro units, summer MW
Heat rate—thermal plants only
First online1956
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 105 | 77.3% | — |
| 2002 | 64 | 47.2% | — |
| 2003 | 74.4 | 54.8% | — |
| 2004 | 90.2 | 66.2% | — |
| 2005 | 93 | 68.5% | — |
| 2006 | 63.6 | 46.9% | — |
| 2007 | 99.9 | 73.6% | — |
| 2008 | 73.4 | 53.9% | — |
| 2009 | 82 | 60.4% | — |
| 2010 | 99 | 72.9% | — |
| 2011 | 77.7 | 57.2% | — |
| 2012 | 87.7 | 64.4% | — |
| 2013 | 91.7 | 67.6% | — |
| 2014 | 97.1 | 71.5% | — |
| 2015 | 72.5 | 53.4% | — |
| 2016 | 68.2 | 50.1% | — |
| 2017 | 87.4 | 55.4% | — |
| 2018 | 95.3 | 60.4% | — |
| 2019 | 81.4 | 51.6% | — |
| 2020 | 88.1 | 55.7% | — |
| 2021 | 85.2 | 54.0% | — |
| 2022 | 75.1 | 47.6% | — |
| 2023 | 75.9 | 53.1% | — |
| 2024 | 82.3 | 52.1% | — |
| 2025 | 85.1 | 53.9% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GRHM | Conventional Hydroelectric | HY | 18 | 18 | Jan 1956 | Operating | — | coming soon |
Owner / operator
Operator: New York Power Authority. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of New York | 100.0% | 18 MW |
Nearby plants
Within 80 km.
| West Delaware Tunnel Plant | 8 MW | 0.1 km |
| Cypert - Fallsburg I | — | 11.3 km |
| Neversink | 25 MW | 11.3 km |
| Reisender Solar | 2 MW | 12.9 km |
| Frog Hollow CSG | 2 MW | 13.4 km |
| Kenmare - Sullivan Community College | 2 MW | 16.1 km |