Cowiche
Yakima County, Washington · EIA plant ID 50423 · Operator: Yakima-Tieton Irrigation Dist
Nameplate2MWSummer 2 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor24%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) |
|---|---|---|---|
| 2001 | 4.1 | 29.1% | — |
| 2002 | 3.1 | 21.8% | — |
| 2003 | 0 | 0.0% | — |
| 2004 | 3.3 | 23.1% | — |
| 2005 | 3.5 | 25.0% | — |
| 2006 | 3.1 | 21.9% | — |
| 2007 | 3.5 | 24.7% | — |
| 2008 | 3.4 | 23.9% | — |
| 2009 | 3.8 | 27.2% | — |
| 2010 | 3.1 | 22.1% | — |
| 2011 | 3.1 | 21.8% | — |
| 2012 | 3.8 | 27.3% | — |
| 2013 | 3.5 | 24.9% | — |
| 2014 | 4.5 | 32.3% | — |
| 2015 | 4.5 | 31.8% | — |
| 2016 | 3.8 | 27.3% | — |
| 2017 | 3.2 | 22.5% | — |
| 2018 | 2.9 | 20.8% | — |
| 2019 | 2.9 | 20.8% | — |
| 2020 | 3.6 | 25.6% | — |
| 2021 | 3.4 | 24.0% | — |
| 2022 | 2.8 | 20.1% | — |
| 2023 | 3 | 21.2% | — |
| 2024 | 2.7 | 19.2% | — |
| 2025 | 3.4 | 23.9% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 983 | Conventional Hydroelectric | HY | 1.7 | 1.6 | Mar 1987 | Operating | — | coming soon |
Owner / operator
Operator: Yakima-Tieton Irrigation Dist. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Yakima-Tieton Irrigation Dist | 100.0% | 2 MW |
Nearby plants
Within 80 km.
| Orchard Avenue 1 | 2 MW | 11.6 km |
| Roza | 13 MW | 21.5 km |
| Tieton Dam Hydro Electric Project | 14 MW | 30.1 km |
| Drop 2 (WA) | 3 MW | 31.2 km |
| Drop 3 (WA) | 2 MW | 32.9 km |
| Camas Solar Project | 5 MW | 38.3 km |