Summer Falls Power Plant
Grant County, Washington · EIA plant ID 56695 · Operator: Columbia Basin Hydropower
Nameplate92MWSummer 92 MW
Generators2in service
Net generation391GWh12 mo to Dec 2025
Capacity factor49%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) |
|---|---|---|---|
| 2007 | 380.5 | 47.2% | — |
| 2008 | 383.4 | 47.4% | — |
| 2009 | 384.3 | 47.7% | — |
| 2010 | 359.6 | 44.6% | — |
| 2011 | 361.6 | 44.9% | — |
| 2012 | 375.3 | 46.4% | — |
| 2013 | 374.8 | 46.5% | — |
| 2014 | 406.3 | 50.4% | — |
| 2015 | 397.5 | 49.3% | — |
| 2016 | 380.1 | 47.0% | — |
| 2017 | 340.2 | 42.2% | — |
| 2018 | 360.8 | 44.8% | — |
| 2019 | 330.5 | 41.0% | — |
| 2020 | 368.4 | 45.6% | — |
| 2021 | 396.9 | 49.3% | — |
| 2022 | 397.9 | 49.4% | — |
| 2023 | 390.2 | 48.4% | — |
| 2024 | 398.2 | 49.3% | — |
| 2025 | 391.2 | 48.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 46 | 46 | Jan 1985 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 46 | 46 | Jan 1985 | Operating | — | coming soon |
Owner / operator
Operator: Columbia Basin Hydropower. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Quincy-Columbia Basin Irr Dist | 33.3% | 31 MW |
| South Columbia Basin Irr Dist | 33.3% | 31 MW |
| East Columbia Basin Irr Dist | 33.3% | 31 MW |
Nearby plants
Within 80 km.
| Main Canal Headworks | 27 MW | 12.7 km |
| SR Quincy Valley | — | 39.7 km |
| Grand Coulee | 6,809 MW | 55.8 km |
| Quincy Chute | retired | 57.9 km |
| PEC Headworks | retired | 59.4 km |
| Chief Joseph | 2,456 MW | 60.7 km |