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629.4 MW Hydro operating in Chelan, WA
629.4 MW
Nameplate Capacity
19
Generators
units
Conventional Hydroelectric
Technology
1931
Operating Since
Coordinates
47.3461, -120.0917
County
Chelan, WA
Nearby Plants
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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 1 of Chelan County - (WA) | Chelan County Public Utility District | — |
| Owner(s) | PUD No 1 of Chelan County | Chelan County Public Utility District | — |
| Status | Operating | operating | — |
GEM identifies the owner as Chelan County Public Utility District
This entity is not yet in the GEM ownership database — chain unavailable.
Rock Island Dam is a hydroelectric dam on the Columbia River, in the U.S. state of Washington. Built from 1929 to 1933, it was the first dam to span the Columbia. It is located near the geographical center of Washington, about 12 miles (19 km) downstream from the city of Wenatchee. By river, the dam is 235 miles (378 km) south of the Canada–U.S. border and 453 miles (729 km) above the mouth of the river at Astoria, Oregon. The dam's reservoir is called Rock Island Pool.
Read more on WikipediaThe Rock Island hydroelectric plant is located in Chelan County, Washington. It is owned and operated by Public Utility District No. 1 of Chelan County. The plant began operating in 1931 and has a total capacity of 629.4 MW across 19 generators, utilizing conventional hydroelectric technology with water as its primary fuel source. Rock Island is the 11th largest power plant in Washington out of 23, and ranks 39th nationally out of 194 plants.
In the most recent year of reported data, Rock Island generated 2,226,611 MWh of electricity, achieving a capacity factor of 40.3%. The plant operates within the Western Electricity Coordinating Council (WECC) NERC region and is under the balancing authority of Public Utility District No. 1 of Chelan County.
Generated from EIA, GEM, and public data sources
Grid Region
Pacific Northwest
Market
Bilateral Market
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Public Utility District No. 1 of Chelan County (CHPD)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
249.8K MWh
Latest Month
2.2M MWh
Annual Generation
40.3%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $1.4B
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This plant is in a bilateral market territory without organized wholesale pricing. Nodal pricing data is not available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-14
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Chelan County PUD commissioners approved leasing 80 acres of Rock Island Dam property to Helion One LLC for the proposed world-first fusion power plant in Malaga, WA—a land-lease event adjacent to the existing hydroelectric facility.