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250 MW BESS operating in Maricopa, AZ
250 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2026
Operating Since
Coordinates
33.3557, -111.6021
County
Maricopa, AZ
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Pediment BESS I LLC | — | — |
| Owner(s) | Pediment BESS I LLC | — | — |
| Status | Operating | — | — |
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
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
No generation data available for this plant.
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2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $340.3M
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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 2026-04-19
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