Lower Granite
Lower Granite is a 810 MW hydroelectric power plant in Whitman County, Washington, operated by USACE Northwestern Division. EIA-860M lists 6 generating units here. Its units entered service between 1975 and 1978.
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
- 810 MW
- 802 MW net summer
- Generating units
- 6
- In service
- 1975–1978
- EIA plant ID
- 6175
Where it is
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- County
- Whitman County, Washington
- Coordinates
- 46.6595, -117.4294
- Balancing authority
- BPAT
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- USACE Northwestern Division
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating (5) · Out of service but expected to return to service in next calendar year (1)
Lower Granite: FAQ
- Where is Lower Granite?
- In Whitman 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 Lower Granite?
- 810 MW of nameplate capacity across 6 units, as of the EIA-860M release for 2026-07.
- Who owns Lower Granite?
- EIA-860M names USACE Northwestern Division 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 Lower Granite LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — USACE Northwestern Division 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 "Lower Granite LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Lower Granite still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.