Cowiche
Cowiche is a 2 MW hydroelectric power plant in Yakima County, Washington, operated by Yakima-Tieton Irrigation Dist. EIA-860M lists 1 generating unit here. Its unit entered service in 1987.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 1.7 MW
- 1.6 MW net summer
- Generating units
- 1
- In service
- 1987
- EIA plant ID
- 50423
Where it is
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- County
- Yakima County, Washington
- Coordinates
- 46.6926, -120.7372
- Balancing authority
- PACW
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Yakima-Tieton Irrigation Dist
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Cowiche: FAQ
- Where is Cowiche?
- In Yakima County, Washington (WA). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Cowiche?
- 2 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Cowiche?
- EIA-860M names Yakima-Tieton Irrigation Dist as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Cowiche LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Yakima-Tieton Irrigation Dist here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Cowiche LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Cowiche still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.