Wanapum — Plant Summary
- EIA Plant ID
- 3888
- Capacity
- 1220 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Grant, WA
- Operating Since
- 2011
- Generators
- 10
- Operator
- PUD No 2 of Grant County
- Parent Company
- —
- Annual Generation
- 4,437,537 MWh
- Capacity Factor
- 41.5%
- Balancing Authority
- Public Utility District No. 2 of Grant County, Washington
- ISO/RTO
- —
- NERC Region
- WECC
Wanapum
OperatingHydro
Ranked #4 of 75 Hydro plants in WA#13 of 1454 nationally
1220 MW Hydro operating in Grant, WA — Public Utility District No. 2 of Grant County, Washington
EIAGEMWD
1,220 MW
Nameplate Capacity
10
Generators
units
Conventional Hydroelectric
Technology
2011
Operating Since
Location
Coordinates
46.8731, -119.9703
County
Grant, WA
Nearby Plants
- Vantage Wind Energy LLCWind90 MW · 17.2 km
- Wild HorseWind273.1 MW · 24.6 km
- Priest RapidsHydro950 MW · 25.8 km
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | PUD No 2 of Grant County | Grant County Public Utility District | — |
| Owner(s) | PUD No 2 of Grant County | Grant County Public Utility District [100%] | — |
| Status | Operating | operating | — |
Ownership Chain
GEM identifies the owner as Grant County Public Utility District [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
Wanapum Dam is a run-of-the-river hydroelectric project located on the Columbia River downstream (south) from Vantage, Washington where Interstate 90 crosses the Columbia from Grant County into Kittitas County. It is owned by the Grant County Public Utility District. Its reservoir is named Lake Wanapum.
Read more on WikipediaWanapum is a 1220 MW conventional hydroelectric power plant located in Grant County, Washington. The plant, which began operating in 2011, is owned and operated by Public Utility District No. 2 of Grant County. It utilizes water as its primary fuel source and consists of 10 generators. Wanapum is the 4th largest power plant out of 23 in Washington state, and ranks 13th out of 194 hydroelectric plants nationally.
In the most recent year of reported generation, Wanapum produced 4,437,537 MWh of electricity, achieving a capacity factor of 41.5%. The plant operates within the Western Electricity Coordinating Council (WECC) NERC region, and its balancing authority is Public Utility District No. 2 of Grant County, Washington.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Public Utility District No. 2 of Grant County, Washington
Grid Voltage
230 kV
Regulatory Status
RE
Entity Type
Political Subdivision
Sector
Electric Utility
Generation
537.8K MWh
Latest Month
4.4M MWh
Annual Generation
41.5%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
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www.dailyuw.com·4 months ago
Regulatory·state puc
Appellate court rules for Chelan County PUD in hydropower contract dispute
The Washington Court of Appeals ruled Tuesday that the Grant County PUD must provide hydropower to the Chelan County PUD in order to repay generation losses.
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ncwlife.com·9 months ago
Regulatory·state puc
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ProPublica·1 years ago
Last updated 2026-03-14
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