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
NERC Region
WECC
Balancing Authority
Salt River Project
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
−1.6K 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.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
RWE commissions 2 GW of new energy projects in the U.S., creating American jobs and economic opportunity
RWE continued to expand its footprint in the U.S. in 2025, bringing its total operational capacity to nearly 13 GW; ~3,500 construction jobs...
AC BOS approves Juniper Spring Solar permit; coal plant claims draw scrutiny
The Apache County Board of Supervisors approved a Conditional Use Permit on Dec. 2, allowing Juniper Spring Solar, LLC to move forward with...
St Joseph Energy Center, USA
The St Joseph Energy Center, a natural gas-fired combined-cycle power plant (CCPP) in Indiana, began operations in 2018.
NextEra, Brightnight and Cordelio seek gen-tie permits for 550MW of Arizona solar-plus-BESS
Brightnight is seeking approval for a generation tie-in transmission line (gen-tie) in Arizona to connect its Eagle Eye project to the grid.
Last updated 2026-03-14
View all 10 articles