Stillwater Reservoir Hydro
Herkimer County, New York · EIA plant ID 50513 · Operator: Northern Power & Light
Nameplate2MWSummer 2 MW
Generators1in service
Net generation5GWh12 mo to Dec 2025
Capacity factor31%hydro units, summer MW
Heat rate—thermal plants only
First online1987
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 | 36.2 | 165.4% | — |
| 2002 | 5.5 | 25.1% | — |
| 2003 | 5.6 | 25.8% | — |
| 2004 | 5.5 | 25.3% | — |
| 2005 | 4.1 | 18.6% | — |
| 2006 | 7.7 | 35.2% | — |
| 2007 | 6.5 | 29.8% | — |
| 2008 | 5.6 | 25.3% | — |
| 2009 | 6.3 | 28.9% | — |
| 2010 | 5.2 | 23.9% | — |
| 2011 | 5.9 | 27.1% | — |
| 2012 | 4.1 | 18.9% | — |
| 2013 | 5.5 | 25.0% | — |
| 2014 | 7.5 | 34.4% | — |
| 2015 | 2.9 | 13.2% | — |
| 2016 | 5.4 | 24.4% | — |
| 2017 | 7.4 | 33.8% | — |
| 2018 | 6.5 | 29.7% | — |
| 2019 | 5.8 | 26.3% | — |
| 2020 | 3.4 | 15.3% | — |
| 2021 | 6 | 27.3% | — |
| 2022 | 6.4 | 29.2% | — |
| 2023 | 5.8 | 26.6% | — |
| 2025 | 4.9 | 30.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 1.8 | 1.8 | Jan 1987 | Operating | — | coming soon |
Owner / operator
Operator: Northern Power & Light. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Hudson River-Black River Regulating District | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Moshier | 8 MW | 8.2 km |
| Eagle | 6 MW | 13 km |
| Soft Maple | 16 MW | 16.5 km |
| Effley | 3 MW | 19.3 km |
| Elmer | 2 MW | 20.2 km |
| Taylorville | 4 MW | 22.8 km |