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6809 MW Conventional Hydroelectric (6495 MW) + Hydroelectric Pumped Storage (314 MW) operating in Grant, WA — Bonneville Power Administration
6,809 MW
Nameplate Capacity
33
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Hydroelectric Pumped Storage
1941
Operating Since
Coordinates
47.9575, -118.9773
County
Grant, WA
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 | U S Bureau of Reclamation | US Bureau of Reclamation | — |
| Owner(s) | U S Bureau of Reclamation | US Bureau of Reclamation | — |
| Status | Operating | operating | — |
GEM identifies the owner as US Bureau of Reclamation
This entity is not yet in the GEM ownership database — chain unavailable.
Grand Coulee Dam is a concrete gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. Constructed between 1933 and 1942, Grand Coulee originally had two powerhouses. The third powerhouse ("Nat"), completed in 1974 to increase energy production, makes Grand Coulee the largest power station in the United States by nameplate capacity at 6,809 MW.
Read more on WikipediaThe Grand Coulee hydroelectric plant is located in Grant County, Washington. With a total capacity of 6809 MW across 33 generators, it is the largest power plant in Washington state and the largest in the United States. The plant, which began operating in 1941, is owned and operated by the U.S. Bureau of Reclamation. It utilizes water as its primary fuel source and employs both conventional hydroelectric and hydroelectric pumped storage technologies, classifying it as a hybrid plant.
In the most recent year with available data, the Grand Coulee plant generated 16,151,147 MWh of electricity, achieving a capacity factor of 27.0%. The plant operates within the Bonneville Power Administration balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
1.7M MWh
Net Discharge
16.2M MWh
Annual Net Energy
27.0%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $15.6B
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
View all 9 articlesNo ask pi reports yet for this entity.
ask pi about Grand CouleeBonneville Power Administration (BPAT)
Grid Voltage
525.0 kV
Regulatory Status
RE — Regulated
Entity Type
Federal
Sector
Electric Utility