Superstition Energy Storage — Plant Summary
- EIA Plant ID
- 66333
- Capacity
- 90 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries
- Status
- Operating
- Location
- Maricopa, AZ
- Operating Since
- 2024
- Generators
- 1
- Operator
- Superstition Energy Storage, LLC
- Parent Company
- —
- Annual Generation
- -15,938 MWh
- Capacity Factor
- -2.0%
- Balancing Authority
- Salt River Project
- ISO/RTO
- —
- NERC Region
- WECC
Superstition Energy Storage
OperatingBESS
Ranked #40 of 55 BESS plants in AZ#345 of 837 nationally
90 MW BESS operating in Maricopa, AZ — Salt River Project
EIA
90 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2024
Operating Since
Location
Coordinates
33.3590, -111.8311
County
Maricopa, AZ
Nearby Plants
- Gilbert Solar Facility I, LLCSolar2 MW · 2.7 km
- SantanNatural Gas1326 MW · 8.1 km
- KyreneNatural Gas573.7 MW · 9.7 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Superstition Energy Storage, LLC | — | — |
| Owner(s) | Superstition Energy Storage, LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
−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.
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
Grid·capacity addition
Tesla Megapack project with huge energy storage is coming online: 'It's intended to provide resilience and additional capacity'
Salt River Project and Plus Power LLC's new grid-charged Tesla Megapack battery storage systems are preparing to come online in Arizona.
Tesla (other)Salt River Project (operator)
The Cool Down·1 years ago
Deals·ppa
SRP inks agreement for new battery storage facility in Mesa tech corridor
Salt River Project has partnered with Austin, Texas-based renewable energy company Aypa Power to complete a lithium-ion system that can pump...
Salt River Project (buyer)Aypa Power (seller)
The Business Journals·1 years ago
Grid·capacity addition
SRP inaugurates 340MW/1,360MWh BESS assets ahead of Arizona summer peak challenges
Sierra Estrella Energy Storage, Arizona's largest standalone BESS project. Image: Salt River Project The 90MW/360MWh Superstition Energy...
Salt River Project (operator)Arizona (other)
Energy-Storage.News·1 years ago
Grid·capacity addition
Two new battery storage projects coming online in Arizona
When both facilities are operational, nearly 1300 MW of battery and pumped hydro storage will be on Salt River Project's system.
Salt River Project (operator)Arizona (other)
Power Engineering·1 years ago
Last updated 2026-03-14
View all 10 articles