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37.6 MW Hydro operating in Spokane, WA
37.6 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1908
Operating Since
Coordinates
47.7749, -117.5444
County
Spokane, WA
Nearby Plants
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Request a demo →| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Avista Corp | Avista | — |
| Owner(s) | Avista Corp | Avista | — |
| Status | Operating | — | — |
Nine Mile is a hydroelectric power plant located in Spokane County, Washington. The plant, owned and operated by Avista Corporation, has a total capacity of 37.6 MW across four generators. It began operating in 1908, utilizing water as its primary fuel source. The plant's balancing authority is Avista Corporation, and it falls within the Western Electricity Coordinating Council (WECC) NERC region.
In the latest year of reported generation, Nine Mile produced 125,735 MWh of electricity, achieving a capacity factor of 38.2%. According to available data, the installed cost per kilowatt was $2,988.28. Nine Mile ranks as the 36th largest power plant in Washington out of 75, and nationally it ranks 365th out of 1464 plants.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Avista Corporation (AVA)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
12.5K MWh
Latest Month
125.7K MWh
Annual Generation
38.2%
Capacity Factor
Run-of-river hydro · Avista Corporation · Data from 2015–2024
$3,066/kW
Installed Cost
$9.7/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
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