Nine Mile
Hydro power plant in Spokane County, Washington. 37.6 MW of nameplate capacity across 4 generators, operated by Avista Corp.
Also known as Nine Mile Power Plant · EIA plant 3869
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 37.6 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- July 1908First generator online
- Operator
- Avista CorpEIA operator ID 20169
- Grid
- AVABalancing authority AVA
- Price nodes
- None linkedNo verified ISO node
- Location
- Spokane County, WA47.7697, −117.5372
- EIA plant ID
- 3869EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Nine Mile produces
Free · EIA-923Net generation, 2025
132 GWh
132,210 MWh, final
Capacity factor, 2025
40.1%
2024: 38.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
66.9–149.8
GWh a year. Low 2015, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 134,597 | Not reported | 12 of 12 |
| 2001 | 99,285 | Not reported | 12 of 12 |
| 2002 | 125,566 | Not reported | 12 of 12 |
| 2003 | 122,429 | Not reported | 12 of 12 |
| 2004 | 134,860 | Not reported | 12 of 12 |
| 2005 | 107,103 | Not reported | 12 of 12 |
| 2006 | 110,083 | Not reported | 12 of 12 |
| 2007 | 99,421 | Not reported | 12 of 12 |
| 2008 | 104,892 | Not reported | 12 of 12 |
| 2009 | 105,851 | Not reported | 12 of 12 |
| 2010 | 101,430 | 43.9% | 12 of 12 |
| 2011 | 90,046 | 38.9% | 12 of 12 |
| 2012 | 106,194 | 45.8% | 12 of 12 |
| 2013 | 82,922 | 47.3% | 12 of 12 |
| 2014 | 55,630 | 31.8% | 12 of 12 |
| 2015 | 66,890 | 28.9% | 12 of 12 |
| 2016 | 108,780 | Not reported | 12 of 12 |
| 2017 | 114,367 | Not reported | 12 of 12 |
| 2018 | 143,308 | 43.5% | 12 of 12 |
| 2019 | 119,575 | 36.3% | 12 of 12 |
| 2020 | 117,927 | 35.7% | 12 of 12 |
| 2021 | 131,047 | 39.8% | 12 of 12 |
| 2022 | 149,810 | 45.5% | 12 of 12 |
| 2023 | 118,300 | 35.9% | 12 of 12 |
| 2024 | 125,735 | 38.1% | 12 of 12 |
| 2025 | 132,210 | 40.1% | 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 | 8.8 | July 1910 |
| 2 | Conventional Hydroelectric | 8.8 | July 1908 |
| 3N | Conventional Hydroelectric | 10.0 | June 1994 |
| 4N | Conventional Hydroelectric | 10.0 | June 1994 |
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 Avista Corp 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 Nine Mile
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Questions about Nine Mile
How much power does Nine Mile produce?
Nine Mile reported 132,210 MWh (132 GWh) of net generation in 2025, a 40.1% capacity factor on 37.6 MW of nameplate capacity.
Where is Nine Mile?
Nine Mile is in Spokane County, Washington, at 47.7697, −117.5372. It is in the Avista Corporation balancing area (AVA).
Who operates Nine Mile?
EIA-860M for August 2026 lists Avista Corp as the operator (EIA operator ID 20169). The operator is not always the owner.
When did Nine Mile start operating?
Its first generator began operating in July 1908, 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)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page