Main Canal Headworks
Grant County, Washington · EIA plant ID 56698 · Operator: Columbia Basin Hydropower
Nameplate27MWSummer 27 MW
Generators1in service
Net generation105GWh12 mo to Dec 2025
Capacity factor45%hydro units, summer MW
Heat rate—thermal plants only
First online1987
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) |
|---|---|---|---|
| 2007 | 100.2 | 42.7% | — |
| 2008 | 102.2 | 43.4% | — |
| 2009 | 102.9 | 43.8% | — |
| 2010 | 95.6 | 40.7% | — |
| 2011 | 80.4 | 34.3% | — |
| 2012 | 101.1 | 42.9% | — |
| 2013 | 102.2 | 43.5% | — |
| 2014 | 108.2 | 46.1% | — |
| 2015 | 89.9 | 38.3% | — |
| 2016 | 99.8 | 42.4% | — |
| 2017 | 89.4 | 38.1% | — |
| 2018 | 98.7 | 42.1% | — |
| 2019 | 85.8 | 36.5% | — |
| 2020 | 97.3 | 41.3% | — |
| 2021 | 107.3 | 45.7% | — |
| 2022 | 105.5 | 45.0% | — |
| 2023 | 103.6 | 44.1% | — |
| 2024 | 103.3 | 43.9% | — |
| 2025 | 105.2 | 44.8% | — |
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 | 26.8 | 26.8 | Jan 1987 | Operating | — | coming soon |
Owner / operator
Operator: Columbia Basin Hydropower. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| East Columbia Basin Irr Dist | 33.3% | 9 MW |
| Quincy-Columbia Basin Irr Dist | 33.3% | 9 MW |
| South Columbia Basin Irr Dist | 33.3% | 9 MW |
Nearby plants
Within 80 km.
| Summer Falls Power Plant | 92 MW | 12.7 km |
| Grand Coulee | 6,809 MW | 44.9 km |
| SR Quincy Valley | — | 48.3 km |
| Chief Joseph | 2,456 MW | 49.2 km |
| Wells | 867 MW | 56 km |
| Chelan | 59 MW | 58.7 km |