Summer Falls Power Plant
Hydro power plant in Grant County, Washington. 92 MW of nameplate capacity across 2 generators, operated by Columbia Basin Hydropower.
Also known as EIA plant 56695
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Key facts
- Capacity
- 92 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- January 1985First generator online
- Operator
- Columbia Basin HydropowerEIA operator ID 55939
- Grid
- AVABalancing authority AVA
- Price nodes
- None linkedNo verified ISO node
- Location
- Grant County, WA47.5025, −119.2917
- EIA plant ID
- 56695EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Summer Falls produces
Free · EIA-923Net generation, 2025
391 GWh
391,151 MWh, final
Capacity factor, 2025
48.5%
2024: 49.3%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
330.5–398.2
GWh a year. Low 2019, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | 380,483 | Not reported | 12 of 12 |
| 2008 | 383,380 | Not reported | 12 of 12 |
| 2009 | 384,331 | Not reported | 12 of 12 |
| 2010 | 359,584 | 44.6% | 12 of 12 |
| 2011 | 361,604 | 44.9% | 12 of 12 |
| 2012 | 375,292 | 46.4% | 12 of 12 |
| 2013 | 374,757 | 46.5% | 12 of 12 |
| 2014 | 406,333 | 50.4% | 12 of 12 |
| 2015 | 397,477 | 49.3% | 12 of 12 |
| 2016 | 380,050 | 47.0% | 12 of 12 |
| 2017 | 340,196 | 42.2% | 12 of 12 |
| 2018 | 360,846 | 44.8% | 12 of 12 |
| 2019 | 330,526 | 41.0% | 12 of 12 |
| 2020 | 368,443 | 45.6% | 12 of 12 |
| 2021 | 396,937 | 49.3% | 12 of 12 |
| 2022 | 397,884 | 49.4% | 12 of 12 |
| 2023 | 390,209 | 48.4% | 12 of 12 |
| 2024 | 398,185 | 49.3% | 12 of 12 |
| 2025 | 391,151 | 48.5% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 46.0 | January 1985 |
| 2 | Conventional Hydroelectric | 46.0 | January 1985 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Columbia Basin Hydropower as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Summer Falls
More plants operated by Columbia Basin Hydropower
Questions about Summer Falls
How much power does Summer Falls Power Plant produce?
Summer Falls Power Plant reported 391,151 MWh (391 GWh) of net generation in 2025, a 48.5% capacity factor on 92 MW of nameplate capacity.
Where is Summer Falls Power Plant?
Summer Falls Power Plant is in Grant County, Washington, at 47.5025, −119.2917. It is in the Avista Corporation balancing area (AVA).
Who operates Summer Falls Power Plant?
EIA-860M for August 2026 lists Columbia Basin Hydropower as the operator (EIA operator ID 55939). The operator is not always the owner.
When did Summer Falls Power Plant start operating?
Its first generator began operating in January 1985, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page