Search
Search plants, projects, owners, and states
Search plants, projects, owners, and states
13 MW Hydro operating in Maricopa, AZ — Salt River Project
13 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1930
Operating Since
Coordinates
33.5661, -111.5360
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | Salt River Project | — |
| Owner(s) | Salt River Project | Salt River Project | — |
| Status | Operating | — | — |
The Stewart Mountain Dam is a concrete thin arch dam located 41 miles northeast of Phoenix, Arizona. The dam is 1,260 feet (380 m) long, 207 feet (63 m) high, and was built between 1928 and 1930. The dam includes a 13,000 kilowatt (kW) hydroelectric generating unit that is operated by SRP, an Arizona public utility. It is primarily operated during the summer months. The dam forms Saguaro Lake as it slows the passage of the Salt River in Maricopa County, Arizona. It was named after a ranch that used to be located nearby known as the Old Stewart Ranch.
Read more on WikipediaStewart Mountain is a 13 MW hydroelectric power plant located in Maricopa County, Arizona. The plant, which began operating in 1930, utilizes conventional hydroelectric technology and is owned and operated by the Salt River Project (SRP). It has one generator and uses water (WAT) as its primary fuel source. The plant's balancing authority is also the Salt River Project.
In the most recent year with available data, Stewart Mountain generated 45,765 MWh of electricity, achieving a capacity factor of 40.0%. Within Arizona, the plant ranks 9th out of 11 hydroelectric facilities. Nationally, it is ranked 591 out of 1464 similar plants. The plant operates within the Western Electricity Coordinating Council (WECC) NERC region.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
0 MWh
Latest Month
45.8K MWh
Annual Generation
40.0%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $29.8M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
View all articlesNo ask pi reports yet for this entity.
ask pi about Stewart MountainSalt River Project (SRP)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility