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1220 MW Hydro operating in Grant, WA — Public Utility District No. 2 of Grant County, Washington
1,220 MW
Nameplate Capacity
10
Generators
units
Conventional Hydroelectric
Technology
2011
Operating Since
Coordinates
46.8731, -119.9703
County
Grant, WA
Nearby Plants
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 - (WA) | Grant County Public Utility District | — |
| Owner(s) | PUD No 2 of Grant County | Grant County Public Utility District | — |
| Status | Operating | operating | — |
GEM identifies the owner as Grant County Public Utility District
This entity is not yet in the GEM ownership database — chain unavailable.
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
Grid Region
Pacific Northwest
Market
Bilateral Market
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
537.8K MWh
Latest Month
4.4M MWh
Annual Generation
41.5%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $2.8B
This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
Last updated 2026-03-26
View all 5 articlesNo ask pi reports yet for this entity.
ask pi about WanapumPublic Utility District No. 2 of Grant County, Washington (GCPD)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility