THREE SISTERS Solar Generation and BESSPlanned
Pinal County, Arizona · EIA plant ID 68298 · Operator: THIS BN, LLC
600 MW planned (Batteries, Solar Photovoltaic), first expected Apr 2029 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service
Net generation—GWh12 mo
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online—
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| THSI1 | Batteries | BA | 300 | 300 | planned Apr 2029 | Planned | — | coming soon |
| THSI2 | Solar Photovoltaic | PV | 300 | 300 | planned Apr 2029 | Planned | — | coming soon |
Owner / operator
Operator: THIS BN, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| Apache Solar I | 40 MW | 6.5 km |
| Apache Station | 782 MW | 6.6 km |
| Sulphur Springs | 20 MW | 9.1 km |
| Roadrunner Solar and BESS | 470 MW | 11.2 km |
| Winchester Solar I, LLC | — | 19.2 km |
| Winchester Solar II, LLC | — | 20.5 km |