90 MW BESS operating in Maricopa, AZ — Salt River Project
90 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
33.3590, -111.8311
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Superstition Energy Storage, LLC | — | — |
| Owner(s) | Superstition Energy Storage, LLC | — | — |
| Status | Operating | — | — |
Superstition Energy Storage is a 90 MW battery energy storage system (BESS) located in Maricopa County, Arizona. The facility began operating in 2024 and is owned and operated by Superstition Energy Storage, LLC. The plant utilizes batteries as its primary fuel source, with a total storage capacity of 360 MWh, providing a duration of 4 hours. The battery chemistry is lithium-ion (LIB).
The facility consists of one generator and operates within the Salt River Project balancing authority in the Western Electricity Coordinating Council (WECC) NERC region. Superstition Energy Storage ranks as the 48th largest power plant in Arizona out of 68 facilities and is ranked 524th nationally out of 1205 plants.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
−1.7K MWh
Net Charging
-15.9K MWh
Annual Net Energy
-2.0%
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.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
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Last updated 2026-03-14
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