Chief Joseph
Douglas County, Washington · EIA plant ID 3921 · Operator: USACE Northwestern Division
Nameplate2,456MWSummer 2,456 MW
Generators27in service
Net generation11,850GWh12 mo to Aug 2026
Capacity factor55%hydro units, summer MW
Heat rate—thermal plants only
First online1955
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 | 7,696.2 | 37.6% | — |
| 2002 | 11,573.7 | 56.5% | — |
| 2003 | 10,137.1 | 49.5% | — |
| 2004 | 10,076.1 | 46.7% | — |
| 2005 | 10,868.8 | 50.5% | — |
| 2006 | 11,551.6 | 53.7% | — |
| 2007 | 11,561.2 | 53.7% | — |
| 2008 | 10,712 | 49.6% | — |
| 2009 | 9,780 | 45.5% | — |
| 2010 | 9,115.6 | 42.4% | — |
| 2011 | 12,503 | 58.1% | — |
| 2012 | 12,480.3 | 57.9% | — |
| 2013 | 12,187.7 | 56.6% | — |
| 2014 | 11,643.6 | 54.1% | — |
| 2015 | 11,462.3 | 53.3% | — |
| 2016 | 11,638.2 | 53.9% | — |
| 2017 | 11,422.4 | 53.1% | — |
| 2018 | 12,352.5 | 59.7% | — |
| 2019 | 9,854 | 46.7% | — |
| 2020 | 11,863.2 | 56.0% | — |
| 2021 | 10,981.3 | 52.0% | — |
| 2022 | 12,477 | 58.0% | — |
| 2023 | 9,390.7 | 43.6% | — |
| 2024 | 9,227.8 | 42.8% | — |
| 2025 | 9,806.2 | 45.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Oct 1958 | Operating | — | coming soon |
| 10 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Sep 1955 | Operating (Out of service, expected back within the year) | — | coming soon |
| 11 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Sep 1955 | Operating (Out of service, expected back within the year) | — | coming soon |
| 12 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Sep 1955 | Operating (Out of service, expected back within the year) | — | coming soon |
| 13 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Feb 1957 | Operating (Out of service, expected back within the year) | — | coming soon |
| 14 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Jul 1957 | Operating | — | coming soon |
| 15 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Sep 1957 | Operating | — | coming soon |
| 16 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Nov 1957 | Operating | — | coming soon |
| 17 | Conventional Hydroelectric | HY | 95 | 95 | Jul 1977 | Operating | — | coming soon |
| 18 | Conventional Hydroelectric | HY | 95 | 95 | Aug 1977 | Operating | — | coming soon |
| 19 | Conventional Hydroelectric | HY | 95 | 95 | Nov 1977 | Operating (Out of service, expected back within the year) | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Jul 1958 | Operating | — | coming soon |
| 20 | Conventional Hydroelectric | HY | 95 | 95 | Jun 1978 | Operating | — | coming soon |
| 21 | Conventional Hydroelectric | HY | 95 | 95 | Jun 1978 | Operating | — | coming soon |
| 22 | Conventional Hydroelectric | HY | 95 | 95 | Jun 1978 | Operating | — | coming soon |
| 23 | Conventional Hydroelectric | HY | 95 | 95 | Sep 1978 | Operating | — | coming soon |
| 24 | Conventional Hydroelectric | HY | 95 | 95 | Jan 1979 | Operating | — | coming soon |
| 25 | Conventional Hydroelectric | HY | 95 | 95 | Jan 1979 | Operating | — | coming soon |
| 26 | Conventional Hydroelectric | HY | 95 | 95 | Feb 1979 | Operating | — | coming soon |
| 27 | Conventional Hydroelectric | HY | 95 | 95 | May 1979 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 88.2 | 88.2 | May 1958 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Feb 1958 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Feb 1957 | Operating | — | coming soon |
| 6 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Dec 1956 | Operating | — | coming soon |
| 7 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Nov 1956 | Operating (Out of service) | — | coming soon |
| 8 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Sep 1956 | Operating (Out of service) | — | coming soon |
| 9 | Conventional Hydroelectric | HY | 88.2 | 88.2 | Dec 1955 | Operating (Out of service, expected back within the year) | — | coming soon |
Owner / operator
Operator: USACE Northwestern Division. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| USACE Northwestern Division | 100.0% | 2,456 MW |
Nearby plants
Within 80 km.
| Wells | 867 MW | 17.6 km |
| Chelan | 59 MW | 33 km |
| Main Canal Headworks | 27 MW | 49.2 km |
| Grand Coulee | 6,809 MW | 49.5 km |
| Summer Falls Power Plant | 92 MW | 60.7 km |
| Rocky Reach | 1,349 MW | 70.9 km |