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300 MW BESS operating in Maricopa, AZ
300 MW
Nameplate Capacity
1
Generators
unit
Batteries
Technology
2025
Operating Since
Coordinates
33.4836, -113.0378
County
Maricopa, AZ
Nearby Plants
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Request a demo →| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | RE Papago LLC | — | — |
| Owner(s) | RE Papago LLC | — | — |
| Status | Operating | — | — |
Papago Energy Storage is a 300 MW battery energy storage system (BESS) located in Maricopa County, Arizona. The facility, owned and operated by RE Papago LLC, commenced operations in 2025. It utilizes batteries as its primary fuel source, designated by the code "MWH," and consists of a single generator. The BESS has a duration of 4 hours.
The plant operates within the Arizona Public Service Company balancing authority and is part of the Western Electricity Coordinating Council (WECC) NERC region. Papago Energy Storage is ranked as the 24th largest power plant in Arizona out of 47, and nationally it holds the 166th position out of 514 plants.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Arizona Public Service Company (AZPS)
Grid Voltage
525.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0 MWh
Net Discharge
0 MWh
Annual Net Energy
0.0%
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.
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Request a demo →2023
$1,361/kW
Est. Construction Cost
Total estimated cost: $408.3M
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Request a demo →This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-04-19
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