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90 MW BESS operating in Maricopa, AZ
90 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Coordinates
33.3590, -111.8311
County
Maricopa, AZ
Nearby Plants
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| 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
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Salt River Project (SRP)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
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.
−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.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $122.5M
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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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