Serrano — Plant Summary
- EIA Plant ID
- 67503
- Capacity
- 383.8 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries, Solar Photovoltaic
- Status
- Operating
- Location
- Pima, AZ
- Operating Since
- 2025
- Generators
- 2
- Operator
- Serrano Solar, LLC
- Parent Company
- —
- Annual Generation
- 324,722 MWh
- Capacity Factor
- 12.8%
- Balancing Authority
- Arizona Public Service Company
- ISO/RTO
- —
- NERC Region
- WECC
Serrano
OperatingBESSSolarHybrid
Ranked #18 of 55 BESS plants in AZ#72 of 837 nationally
383.8 MW Batteries (214 MW) + Solar Photovoltaic (170 MW) operating in Pima, AZ — Arizona Public Service Company
EIAGEM
383.8 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2025
Operating Since
Location
Coordinates
32.5024, -111.3037
County
Pima, AZ
Nearby Plants
- SaguaroNatural Gas184.5 MW · 5.5 km
- Red RockBESS84.9 MW · 5.6 km
- Davis Battery StorageBESS11.8 MW · 12.2 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Serrano Solar, LLC | — | — |
| Owner(s) | Serrano Solar, LLC | — | — |
| Status | Operating | operating | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
Engineering & Generators
Grid Context
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
Generation
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.
Financial DataBeta
Source: FERC Electric Quarterly ReportsHIGH
$20.0/MWh
PPA Price
Serrano Solar, LLC
Contract Seller
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (9)Beta
Grid·capacity addition
Solar is 77.7% of new capacity added to U.S. grid in 2025
Solar reached 11% of U.S. electric generation capacity, said data through April from the Federal Energy Regulatory Commission.
Federal Energy Regulatory Commission (regulator)
pv magazine USA·8 months ago
Grid·outage
Millions lose power in Puerto Rico amid massive blackout ahead of Easter
People in Puerto Rico are again facing a massive power outage across the island, this time ahead of the Easter 2025 holiday.
Puerto Rico (other)
USA Today·11 months ago
Deals·project finance
Longroad Energy brings battery storage capacity at Arizona solar ‘Complex’ to 2.4GWh
Longroad Energy announced financial close of 111MWdc solar and 85MWac/340MWh storage project Sun Pond in Arizona 4 December.
Longroad Energy (developer)
Energy-Storage.News·1 years ago
Deals·project finance
Project Finance Brief: Primergy Secures $588 Million for 408 MW Solar Project
Primergy Solar, a developer, owner, and operator focused on distributed and utility-scale solar PV and battery storage projects ...
Primergy Solar (developer)
Mercom Capital Group·2 years ago
Last updated 2026-03-14
View all 9 articles