Mormon Flat — Plant Summary
- EIA Plant ID
- 148
- Capacity
- 63.5 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric, Hydroelectric Pumped Storage
- Status
- Operating
- Location
- Maricopa, AZ
- Operating Since
- 1926
- Generators
- 2
- Operator
- Salt River Project
- Parent Company
- Salt River Project
- Annual Generation
- 45,690 MWh
- Capacity Factor
- 8.2%
- Balancing Authority
- Salt River Project
- ISO/RTO
- —
- NERC Region
- WECC
Mormon Flat
OperatingHydroHybrid
Ranked #5 of 11 Hydro plants in AZ#262 of 1454 nationally
63.5 MW Conventional Hydroelectric (9 MW) + Hydroelectric Pumped Storage (54 MW) operating in Maricopa, AZ — Salt River Project
EIAGEMWD
63.5 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Hydroelectric Pumped Storage
1926
Operating Since
Location
Coordinates
33.5536, -111.4431
County
Maricopa, AZ
Nearby Plants
- Stewart MountainHydro13 MW · 8.7 km
- Horse MesaHydro131.3 MW · 10.1 km
- Pediment BESS IBESS250 MW · 26.5 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Salt River Project | Salt River Project | — |
| Owner(s) | Salt River Project | Salt River Project | — |
| Status | Operating | operating | — |
Ownership Chain
About
The Mormon Flat Dam is a dam on the Salt River located Northeast of Phoenix, Arizona.
Read more on WikipediaMormon Flat is a 63.5 MW hybrid hydroelectric power plant located in Maricopa County, Arizona. The plant, which began operating in 1926, is owned and operated by Salt River Project. It utilizes conventional hydroelectric and pumped storage technologies, with water (WAT) as its primary fuel source. The facility consists of two generators.
Mormon Flat ranks as the 5th largest hydroelectric plant in Arizona (out of 11) and 266th nationally (out of 1464). In the most recent year of reported data, the plant generated 45,690 MWh of electricity, achieving a capacity factor of 8.2%. The plant operates within the Salt River Project balancing authority and the Western Electricity Coordinating Council (WECC) NERC region.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
115 kV
Regulatory Status
RE
Entity Type
Political Subdivision
Sector
Electric Utility
Generation
−443 MWh
Net Charging
45.7K MWh
Annual Net Energy
8.2%
Capacity Factor
Jan 2023 – Dec 2025
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.
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
Last updated 2026-03-26
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