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131.3 MW Conventional Hydroelectric (32 MW) + Hydroelectric Pumped Storage (100 MW) operating in Maricopa, AZ
131.3 MW
Nameplate Capacity
4
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Hydroelectric Pumped Storage
1927
Operating Since
Coordinates
33.5907, -111.3440
County
Maricopa, AZ
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | US Bureau of Reclamation | — |
| Owner(s) | Salt River Project | Salt River Project | — |
| Status | Operating | operating | — |
The Horse Mesa Dam is a concrete thin arch dam located in the Superstition Mountains, northeast of Phoenix in Maricopa County, Arizona.
Read more on WikipediaHorse Mesa is a 131.3 MW hydroelectric power plant located in Maricopa County, Arizona. The plant, which began operating in 1927, is owned and operated by Salt River Project. It utilizes conventional hydroelectric and pumped storage technologies, and is considered a hybrid plant. The facility has four generators and its primary fuel source is water (WAT).
In the most recent year of reported data, Horse Mesa generated 87,872 MWh of electricity, achieving a capacity factor of 7.6%. The plant operates within the Salt River Project balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Horse Mesa is ranked as the 4th largest hydroelectric plant out of 4 in Arizona, and 147th out of 194 nationally.
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.
242 MWh
Net Discharge
87.9K MWh
Annual Net Energy
7.6%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $301.3M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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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 2026-04-09
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