Gorge
Whatcom County, Washington · EIA plant ID 6431 · Operator: City of Seattle - (WA)
Nameplate207MWSummer 193 MW
Generators4in service
Net generation942GWh12 mo to Aug 2026
Capacity factor56%hydro units, summer MW
Heat rate—thermal plants only
First online1924
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 | 586.2 | 37.9% | — |
| 2002 | 1,023.6 | 66.2% | — |
| 2003 | 929.3 | 60.1% | — |
| 2004 | 922.5 | 59.5% | — |
| 2005 | 775.7 | 51.3% | — |
| 2006 | 870.5 | 57.5% | — |
| 2007 | 1,075.1 | 71.1% | — |
| 2008 | 915.4 | 56.6% | — |
| 2009 | 838.9 | 52.0% | — |
| 2010 | 870.4 | 56.5% | — |
| 2011 | 1,093.2 | 70.9% | — |
| 2012 | 1,080.1 | 69.9% | — |
| 2013 | 954.2 | 61.9% | — |
| 2014 | 1,056.7 | 68.5% | — |
| 2015 | 952.6 | 61.8% | — |
| 2016 | 1,035.5 | 67.0% | — |
| 2017 | 997.6 | 64.7% | — |
| 2018 | 946 | 56.0% | — |
| 2019 | 831.8 | 49.2% | — |
| 2020 | 957.2 | 56.5% | — |
| 2021 | 987.7 | 58.4% | — |
| 2022 | 988.7 | 58.5% | — |
| 2023 | 725.5 | 42.9% | — |
| 2024 | 689 | 40.6% | — |
| 2025 | 769 | 45.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 21 | Conventional Hydroelectric | HY | 36.8 | 32 | Sep 1924 | Operating | — | coming soon |
| 22 | Conventional Hydroelectric | HY | 36.8 | 32 | Sep 1924 | Operating | — | coming soon |
| 23 | Conventional Hydroelectric | HY | 36.8 | 32 | May 1929 | Operating | — | coming soon |
| 24 | Conventional Hydroelectric | HY | 96.9 | 97 | Jun 1951 | Operating | — | coming soon |
Owner / operator
Operator: City of Seattle - (WA). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Seattle - (WA) | 100.0% | 207 MW |
Nearby plants
Within 80 km.
| Newhalem | 2 MW | 3.4 km |
| Diablo | 182 MW | 5.9 km |
| Ross | 450 MW | 11 km |
| Upper Baker | 105 MW | 35.8 km |
| Koma Kulshan Associates | 12 MW | 37.8 km |
| Lower Baker | 104 MW | 42.5 km |