Rock Island

OperatingHydro

Ranked #11 of 75 Hydro plants in WA#39 of 1454 nationally

629.4 MW Hydro operating in Chelan, WA — Public Utility District No. 1 of Chelan County

EIAGEMWD

629.4 MW

Nameplate Capacity

Generators

units

Conventional Hydroelectric

Technology

1931

Operating Since

Location

Coordinates

47.3461, -120.0917

County

Chelan, WA

Nearby Plants

Orion - Helion
Hydrogen50 MW · 1.4 km
PEC Headworks
Hydro6.6 MW · 25.5 km
Rocky Reach
Hydro1299.6 MW · 25.9 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 1 of Chelan County	Chelan County Public Utility District	—
Owner(s)	PUD No 1 of Chelan County	Chelan County Public Utility District [100%]	—
Status	Operating	operating	—

Ownership Chain

GEM identifies the owner as Chelan County Public Utility District [100%]

This entity is not yet in the GEM ownership database — chain unavailable.

About

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 Wikipedia

The 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