Diana Hydroelectric
Lewis County, New York · EIA plant ID 10237 · Operator: EONY Generation Limited
Nameplate2MWSummer 2 MW
Generators1in service
Net generation5GWh12 mo to Dec 2025
Capacity factor33%hydro units, summer MW
Heat rate—thermal plants only
First online1985
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 | 6.4 | 91.1% | — |
| 2002 | 6.7 | 45.1% | — |
| 2003 | 7.3 | 48.7% | — |
| 2004 | 5.9 | 39.6% | — |
| 2005 | 7.3 | 44.5% | — |
| 2006 | 8.4 | 55.3% | — |
| 2007 | 5.7 | 38.3% | — |
| 2008 | 5.7 | 38.2% | — |
| 2009 | 7.7 | 51.7% | — |
| 2010 | 6.7 | 44.7% | — |
| 2011 | 6 | 40.2% | — |
| 2012 | 6.1 | 40.6% | — |
| 2013 | 5.7 | 38.5% | — |
| 2014 | 7.1 | 47.5% | — |
| 2015 | 5 | 33.4% | — |
| 2016 | 4.3 | 30.7% | — |
| 2017 | 7.7 | 51.8% | — |
| 2018 | 6.6 | 47.1% | — |
| 2019 | 8 | 53.5% | — |
| 2020 | 5.3 | 37.6% | — |
| 2021 | 6.1 | 40.8% | — |
| 2022 | 6.2 | 41.8% | — |
| 2023 | 8.3 | 55.9% | — |
| 2024 | 7.7 | 51.7% | — |
| 2025 | 4.9 | 33.0% | — |
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 | 1.7 | Jul 1985 | Operating | — | coming soon |
Owner / operator
Operator: EONY Generation Limited. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| EONY Generation Limited | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Hollow Dam Power Partnership | 1 MW | 16.1 km |
| South Edwards | 4 MW | 16.3 km |
| Oswegatchie | 2 MW | 16.4 km |
| Hampshire Paper | 3 MW | 16.5 km |
| Talcville | 1 MW | 17.4 km |
| Hailesboro 4 Plant | 1 MW | 20.3 km |