Long Lake — Plant Summary
- EIA Plant ID
- 3867
- Capacity
- 70 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Lincoln, WA
- Operating Since
- 1915
- Generators
- 4
- Operator
- Avista Corp
- Parent Company
- Avista
- Annual Generation
- 456,166 MWh
- Capacity Factor
- 68.9%
- Balancing Authority
- Avista Corporation
- ISO/RTO
- —
- NERC Region
- WECC
Long Lake
OperatingHydro
Ranked #29 of 75 Hydro plants in WA#253 of 1454 nationally
70 MW Hydro operating in Lincoln, WA — Avista Corporation
EIAGEMWD
70 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1915
Operating Since
Location
Coordinates
47.8366, -117.8408
County
Lincoln, WA
Nearby Plants
- Little Falls (WA)Hydro43.2 MW · 5.9 km
- Nine MileHydro37.6 MW · 23.2 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Avista Corp | Avista | — |
| Owner(s) | Avista Corp | Avista | — |
| Status | Operating | operating | — |
Ownership Chain
About
Long Lake Dam is a concrete gravity dam on the Spokane River, between Lincoln County and Stevens County about 30 miles (48 km) northwest of Spokane in eastern Washington. It forms Long Lake (Washington), a 23.5 mi (37.8 km) long reservoir, and has a hydroelectric generating capacity of 71 megawatts. The dam was built by Washington Water Power, which operates five other dams along the Spokane.
Read more on WikipediaLong Lake is a 70 MW hydroelectric power plant located in Lincoln County, Washington. The plant began operating in 1915 and consists of four generators utilizing conventional hydroelectric technology. It is owned and operated by Avista Corporation. The plant's primary fuel source is water (WAT). Long Lake is within the Avista Corporation balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
In the most recent year with available data, Long Lake generated 456,166 MWh, achieving a capacity factor of 68.9%. According to available data, the installed cost per kW for the plant was $897.19. Long Lake ranks as the 28th largest power plant in Washington out of 75, and nationally it ranks 254th 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
41.9K MWh
Latest Month
456.2K MWh
Annual Generation
68.9%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Form 1HIGH
$953/kW
Installed Cost
$3.2/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 (8)Beta
Last updated 2026-03-14
View all 8 articles