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600 MW Batteries (300 MW) + Solar Photovoltaic (300 MW) operating in Maricopa, AZ — Arizona Public Service Company
600 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2025
Operating Since
Coordinates
33.4600, -113.1100
County
Maricopa, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Copia Power | — | — |
| Owner(s) | Copia Power | — | — |
| Status | Operating | operating | — |
Harquahala 2 is a 600 MW hybrid power plant located in Maricopa County, Arizona. The facility, which began operating in 2025, combines solar photovoltaic generation with battery energy storage. It is owned and operated by Copia Power. The plant utilizes fixed-tilt solar tracking and its battery energy storage system (BESS) has a duration of 4 hours. Harquahala 2 ranks as the 13th largest power plant in Arizona out of 47, and 48th nationally out of 514.
The plant's primary fuel source is listed as MWH, reflecting its reliance on solar energy. In its latest year of operation, Harquahala 2 generated 647,592 MWh of electricity, achieving a capacity factor of 16.3%. The plant consists of 2 generators and operates within the Arizona Public Service Company balancing authority, under the Western Electricity Coordinating Council (WECC) NERC region.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
43.4K MWh
Net Discharge
647.6K MWh
Annual Net Energy
16.3%
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: $816.6M
This plant's balancing authority participates in CAISO's Western Energy Imbalance Market (WEIM). Direct nodal pricing data is not yet available.
Last updated 2026-04-09
View all 5 articlesArizona Public Service Company (AZPS)
Grid Voltage
250.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP