Stewart Mountain
Stewart Mountain is a 13 MW hydroelectric power plant in Maricopa County, Arizona, operated by Salt River Project. EIA-860M lists 1 generating unit here. Its unit entered service in 1930.
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
- 13 MW
- 13 MW net summer
- Generating units
- 1
- In service
- 1930
- EIA plant ID
- 150
Where it is
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- County
- Maricopa County, Arizona
- Coordinates
- 33.5661, -111.536
- Balancing authority
- SRP
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Salt River Project
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Stewart Mountain: FAQ
- Where is Stewart Mountain?
- In Maricopa County, Arizona (AZ). 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 Stewart Mountain?
- 13 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Stewart Mountain?
- EIA-860M names Salt River Project 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 Stewart Mountain LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Salt River Project 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 "Stewart Mountain LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Stewart Mountain still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.