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600 MW Batteries (300 MW) + Solar Photovoltaic (300 MW) planned in Pinal, AZ — Arizona Public Service Company
600 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
Planned: —
Planned Operation
Coordinates
32.0537, -109.8230
County
Pinal, AZ
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | THSI bn, LLC | — | — |
| Owner(s) | Cordelio Power Holdings, LLC, WestDevco, LLC | — | — |
| Status | Planned | pre-construction | — |
The Three Sisters Solar Generation and BESS facility is a 600 MW hybrid power plant located in Pinal County, Arizona. It is owned and operated by THSI bn, LLC. The plant utilizes both solar photovoltaic technology and battery energy storage systems (BESS). It consists of two generators and uses a fixed tilt solar tracking system.
The plant's primary fuel source is listed as MWH, reflecting its reliance on solar energy and battery storage. Three Sisters operates within the Arizona Public Service Company balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 10th largest power plant in Arizona out of 47, and nationally it holds a rank of 44 out of 514.
Generated from EIA, GEM, and public data sources
Grid Region
Mountain West
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
No generation data available for this plant.
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 2026-03-26
View all articlesArizona Public Service Company (AZPS)
Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP