250 MW BESS under construction in Maricopa, AZ — Salt River Project
250 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
—
Operating Since
Coordinates
33.3557, -111.6021
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Pediment BESS I LLC | — | — |
| Owner(s) | Pediment BESS I LLC | — | — |
| Status | Under construction | — | — |
Pediment BESS I is a 250 MW battery energy storage system located in Maricopa County, Arizona. The plant, identified by the EIA plant code 68477, is owned and operated by Pediment BESS I LLC. It consists of a single generator utilizing batteries as its primary fuel source, measured in MWh. The facility operates within the Salt River Project balancing authority, which falls under the Western Electricity Coordinating Council (WECC) NERC region.
The plant is ranked as the 29th largest power plant in Arizona out of 47, and nationally it holds a rank of 197 out of 514 facilities. Public information indicates that the plant has been the subject of 7 news articles, with 5 focusing on deals and 2 covering industry-related topics.
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
No generation data available for this plant.
No financial data available for this plant.
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
Last updated 2026-03-26
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