Rock Island
Chelan County, Washington · EIA plant ID 6200 · Operator: PUD No 1 of Chelan County
Nameplate629MWSummer 503 MW
Generators19in service
Net generation2,621GWh12 mo to Aug 2026
Capacity factor59%hydro units, summer MW
Heat rate—thermal plants only
First online1931
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1,855.7 | 34.0% | — |
| 2002 | 2,514.6 | 46.0% | — |
| 2003 | 2,272.3 | 41.6% | — |
| 2004 | 2,302 | 42.0% | — |
| 2005 | 2,389.4 | 43.7% | — |
| 2006 | 2,517.8 | 46.1% | — |
| 2007 | 2,585.6 | 47.3% | — |
| 2008 | 2,413.3 | 44.0% | — |
| 2009 | 2,261.9 | 51.5% | — |
| 2010 | 2,177.6 | 49.5% | — |
| 2011 | 2,922.3 | 66.5% | — |
| 2012 | 2,925.4 | 66.2% | — |
| 2013 | 2,673.7 | 60.7% | — |
| 2014 | 2,780.3 | 63.1% | — |
| 2015 | 2,744.5 | 62.3% | — |
| 2016 | 2,666.2 | 60.3% | — |
| 2017 | 2,640 | 59.9% | — |
| 2018 | 2,652.1 | 60.2% | — |
| 2019 | 2,257.7 | 51.2% | — |
| 2020 | 2,500.5 | 56.6% | — |
| 2021 | 2,382.8 | 54.1% | — |
| 2022 | 2,611.6 | 59.3% | — |
| 2023 | 2,032.7 | 46.1% | — |
| 2024 | 2,025.3 | 45.8% | — |
| 2025 | 2,226.6 | 50.5% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| A | Conventional Hydroelectric | HY | 1.2 | 1.2 | Oct 1931 | Operating | — | coming soon |
| B-1 | Conventional Hydroelectric | HY | 20.7 | 15 | Nov 1931 | Operating (Out of service) | — | coming soon |
| B-10 | Conventional Hydroelectric | HY | 22.5 | 19 | Apr 1953 | Operating | — | coming soon |
| B-2 | Conventional Hydroelectric | HY | 20.7 | 15 | Oct 1931 | Operating (Out of service) | — | coming soon |
| B-3 | Conventional Hydroelectric | HY | 20.7 | 15 | Dec 1932 | Operating | — | coming soon |
| B-4 | Conventional Hydroelectric | HY | 20.7 | 15 | Oct 1932 | Operating | — | coming soon |
| B-5 | Conventional Hydroelectric | HY | 22.5 | 17 | Sep 1952 | Operating | — | coming soon |
| B-6 | Conventional Hydroelectric | HY | 22.5 | 17 | Oct 1952 | Operating | — | coming soon |
| B-7 | Conventional Hydroelectric | HY | 22.5 | 17 | Nov 1952 | Operating | — | coming soon |
| B-8 | Conventional Hydroelectric | HY | 22.5 | 17 | Jan 1953 | Operating (Out of service) | — | coming soon |
| B-9 | Conventional Hydroelectric | HY | 22.5 | 19 | Mar 1953 | Operating | — | coming soon |
| U-1 | Conventional Hydroelectric | HY | 51.3 | 42 | Aug 1979 | Operating | — | coming soon |
| U-2 | Conventional Hydroelectric | HY | 51.3 | 42 | Jun 1979 | Operating | — | coming soon |
| U-3 | Conventional Hydroelectric | HY | 51.3 | 42 | Apr 1979 | Operating | — | coming soon |
| U-4 | Conventional Hydroelectric | HY | 51.3 | 42 | Feb 1979 | Operating | — | coming soon |
| U-5 | Conventional Hydroelectric | HY | 51.3 | 42 | Dec 1978 | Operating (Out of service) | — | coming soon |
| U-6 | Conventional Hydroelectric | HY | 51.3 | 42 | Oct 1978 | Operating | — | coming soon |
| U-7 | Conventional Hydroelectric | HY | 51.3 | 42 | Aug 1978 | Operating | — | coming soon |
| U-8 | Conventional Hydroelectric | HY | 51.3 | 42 | Jul 1978 | Operating | — | coming soon |
Owner / operator
Operator: PUD No 1 of Chelan County. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| PUD No 1 of Chelan County | 100.0% | 629 MW |
Nearby plants
Within 80 km.
| Orion - Helion | — | 1.4 km |
| PEC Headworks | retired | 25.5 km |
| Rocky Reach | 1,349 MW | 25.9 km |
| SR Quincy Valley | — | 30.1 km |
| Wild Horse | 273 MW | 35.5 km |
| Vantage Wind Energy LLC | 90 MW | 44.1 km |