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13 MW Hydro operating in Maricopa, AZ
13 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1930
Operating Since
Coordinates
33.5661, -111.5360
County
Maricopa, AZ
Nearby Plants
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| 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
Salt River Project (SRP)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Political Subdivision
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
0 MWh
Latest Month
45.8K MWh
Annual Generation
40.0%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $29.8M
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This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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