383.8 MW Batteries (214 MW) + Solar Photovoltaic (170 MW) operating in Pima, AZ — Arizona Public Service Company
383.8 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2025
Operating Since
Coordinates
32.5024, -111.3037
County
Pima, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Serrano Solar, LLC | — | — |
| Owner(s) | Serrano Solar, LLC | — | — |
| Status | Operating | operating | — |
The Serrano plant, located in Pima County, Arizona, is a hybrid solar and battery energy storage system (BESS) facility with a total capacity of 383.8 MW. The plant began operating in 2025 and is owned and operated by Serrano Solar, LLC. It utilizes both solar photovoltaic technology and batteries, with the BESS having a duration of 4 hours. The solar component employs a fixed tilt tracking system. Serrano is ranked as the 22nd largest plant in Arizona out of 47, and 106th nationally out of 514.
The plant's primary fuel source is listed as MWH. In its latest year of operation, Serrano generated 324,722 MWh, achieving a capacity factor of 12.8%. The plant operates within the Arizona Public Service Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. Financial data indicates that Serrano has a power purchase agreement (PPA) price of $20 per MWh, as reported in FERC EQRs.
Generated from EIA, GEM, and public data sources
NERC Region
WECC
Balancing Authority
Arizona Public Service Company
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
19.7K MWh
Net Discharge
324.7K MWh
Annual Net Energy
12.8%
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.
$20.0/MWh
PPA Price
Serrano Solar, LLC
Contract Seller
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
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