THREE SISTERS Solar Generation and BESS — Plant Summary
- EIA Plant ID
- 68298
- Capacity
- 600 MW
- Primary Fuel
- Battery Storage
- Technology
- Batteries, Solar Photovoltaic
- Status
- Planned
- Location
- Pinal, AZ
- Operating Since
- —
- Generators
- 2
- Operator
- THSI bn, LLC
- Parent Company
- —
- Balancing Authority
- Arizona Public Service Company
- ISO/RTO
- —
- NERC Region
- WECC
THREE SISTERS Solar Generation and BESS
PlannedBESSSolarHybridGEM: pre-construction
Ranked #11 of 55 BESS plants in AZ#31 of 837 nationally
600 MW Batteries (300 MW) + Solar Photovoltaic (300 MW) planned in Pinal, AZ — Arizona Public Service Company
EIAGEM
600 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
Planned: —
Planned Operation
Location
Coordinates
32.0537, -109.8230
County
Pinal, AZ
Nearby Plants
- Apache Solar IBESS40 MW · 6.6 km
- Apache StationNatural Gas826.3 MW · 6.6 km
- Sulphur SpringsSolar20 MW · 9.4 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | THSI bn, LLC | — | — |
| Owner(s) | Cordelio Power Holdings, LLC, WestDevco, LLC | — | — |
| Status | Planned | pre-construction | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
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
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
No generation data available for this plant.
Financial Data
No financial data available for this plant.
Pricing & Market Data
This plant is outside organized wholesale electricity markets (ISOs/RTOs). Nodal pricing data is not available.
News & Articles (10)Beta
General
Recurrent Energy secures US$825 million financing for Arizona BESS and solar projects
Recurrent has closed financing for an Arizona energy storage project in. Cypress Creek has financed a solar-plus-storage project in...
Energy-Storage.News·5 months ago
General
Recurrent Energy secures US$825 million financing for Arizona BESS and solar projects
Recurrent has closed financing for an Arizona energy storage project in. Cypress Creek has financed a solar-plus-storage project in...
Energy-Storage.News·5 months ago
General
Recurrent Energy secures US$825 million financing for Arizona BESS and solar projects
Recurrent has closed financing for an Arizona energy storage project in. Cypress Creek has financed a solar-plus-storage project in...
Energy-Storage.News·5 months ago
General
Recurrent Energy secures US$825 million financing for Arizona BESS and solar projects
Recurrent has closed financing for an Arizona energy storage project in. Cypress Creek has financed a solar-plus-storage project in...
Energy-Storage.News·5 months ago
Last updated 2026-03-26
View all 10 articles