Nine Mile — Plant Summary
- EIA Plant ID
- 3869
- Capacity
- 37.6 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Spokane, WA
- Operating Since
- 1908
- Generators
- 4
- Operator
- Avista Corp
- Parent Company
- Avista
- Annual Generation
- 125,735 MWh
- Capacity Factor
- 38.2%
- Balancing Authority
- Avista Corporation
- ISO/RTO
- —
- NERC Region
- WECC
Nine Mile
OperatingHydro
Ranked #36 of 75 Hydro plants in WA#360 of 1454 nationally
37.6 MW Hydro operating in Spokane, WA — Avista Corporation
EIAWD
37.6 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1908
Operating Since
Location
Coordinates
47.7749, -117.5444
County
Spokane, WA
Nearby Plants
- Northeast (WA)Natural Gas61.8 MW · 13.7 km
- Upper FallsHydro10 MW · 15.5 km
- Monroe StreetHydro14.8 MW · 16.4 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Avista Corp | Avista | — |
| Owner(s) | Avista Corp | Avista | — |
| Status | Operating | — | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Avista Corporation
Grid Voltage
115 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
12.5K MWh
Latest Month
125.7K MWh
Annual Generation
38.2%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Form 1HIGH
$3,066/kW
Installed Cost
$9.7/MWh
Operating Cost
Avista Corporation
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Deals·debt financing
Constellation Secures $1 Billion Federal Loan For Three Mile Island Restart
Nuclear plant could be back online in 2027 to supply power to Microsoft.
Constellation (other)Three Mile Island (other)
NucNet·4 months ago
Hazards·wildfire
Avista likely to shut off power in north Spokane due to wildfire danger
SPOKANE, Wash. -- People living in northwest Spokane may lose power today in order to mitigate wildfire risk.
Avista (operator)Spokane (other)
KXLY.com·6 months ago
Industry·other
Robert L. Bob Blunt
In Loving Memory April 13, 1946 - August 16, 2025 MEXICO, NY - Robert L. "Bob" Blunt, 79, of Mexico, NY, passed away on August 16, 2025.
Robert L. Bob Blunt (other)
Syracuse.com·7 months ago
Regulatory·state puc
Article | New York considers subsidizing upstate nuclear plants until 2050
ALBANY, New York — Gov. Kathy Hochul's administration wants to keep New York's aging upstate nuclear plants online for decades to come.
New York (other)Kathy Hochul (executive)
POLITICO Pro·7 months ago
Last updated 2026-03-14
View all 10 articles