🔌 EV Partnership Switch to Octopus Energy & unlock exclusive smart EV charging rates Find out more → Skip to main content

United States › Power plants › Hydroelectric plants › Washington

HYDROELECTRIC PLANTS

Rock Island

Rock Island is a 514 MW operating hydroelectric plant in Chelan County, Washington, operated by PUD No 1 of Chelan County - (WA).

Plant statusOperating
  1. Planning (completed)
  2. Consented (completed)
  3. Construction (completed)
  4. OperatingOct 1931 (current stage)
  5. Closed (not yet reached)

This plant has generators at more than one stage; see the table below.

Open in Google MapsMore hydroelectric plants in Washington

Generators

Each generating unit EIA lists at this plant.

UnitTechnologyCapacityStatusOnlineRetired / planned retirement
U-1Conventional Hydroelectric51 MW OperatingAug 1979
U-2Conventional Hydroelectric51 MW OperatingJun 1979
U-3Conventional Hydroelectric51 MW OperatingApr 1979
U-4Conventional Hydroelectric51 MW OperatingFeb 1979
U-5Conventional Hydroelectric51 MW Out of service long-termDec 1978
U-6Conventional Hydroelectric51 MW OperatingOct 1978
U-7Conventional Hydroelectric51 MW OperatingAug 1978
U-8Conventional Hydroelectric51 MW OperatingJul 1978
B-5Conventional Hydroelectric23 MW OperatingSep 1952
B-6Conventional Hydroelectric23 MW OperatingOct 1952
B-7Conventional Hydroelectric23 MW OperatingNov 1952
B-8Conventional Hydroelectric23 MW Out of service long-termJan 1953
B-9Conventional Hydroelectric23 MW OperatingMar 1953
B-10Conventional Hydroelectric23 MW OperatingApr 1953
B-1Conventional Hydroelectric21 MW Out of service long-termNov 1931
B-2Conventional Hydroelectric21 MW Out of service long-termOct 1931
B-3Conventional Hydroelectric21 MW OperatingDec 1932
B-4Conventional Hydroelectric21 MW OperatingOct 1932
AConventional Hydroelectric1.2 MW OperatingOct 1931

Plant details

Operator
PUD No 1 of Chelan County - (WA)
Location
Chelan County, Washington
Balancing authority
CHPD
Sector
Electric Utility
Capacity
Operating: 514 MW
Out of service: 115 MW
First unit online
Oct 1931
EIA plant ID
6200

Location

47.3461, -120.0917

Nearby power plants

Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem