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100 MW BESS operating in Pinal, AZ — Salt River Project
100 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2023
Operating Since
Coordinates
32.8695, -111.5142
County
Pinal, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Saint Energy Storage II LLC | — | — |
| Owner(s) | Saint Energy Storage II LLC | — | — |
| Status | Operating | — | — |
Saint Energy Storage II LLC is a 100 MW battery energy storage system (BESS) located in Pinal County, Arizona. The facility, owned and operated by Saint Energy Storage II LLC, began operating in 2023. It is interconnected to the Salt River Project balancing authority within the Western Electricity Coordinating Council (WECC) NERC region. The plant is fueled by MWH, indicating it draws power from the grid to charge its batteries.
The facility consists of a single generator utilizing lithium-ion battery (LIB) technology. The BESS has a total storage capacity of 400 MWh, providing a duration of 4 hours at its full 100 MW discharge rate. According to state rankings, Saint Energy Storage II LLC is the 47th largest power plant in Arizona out of 47 plants. Nationally, it ranks 511 out of 514.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
−1.6K MWh
Net Charging
-16.7K MWh
Annual Net Energy
-1.9%
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.
2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $136.1M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-03-26
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ask pi about Saint Energy Storage II LLCSalt River Project (SRP)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP