Winmil Clean Energy Center (BESS)
Brazoria County, Texas · EIA plant ID 69460 · Operator: On Energy Storage
Nameplate12MWSummer 12 MW
Generators1in service
Net generation-0GWh12 mo to Dec 2025
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online2025
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2025 | -0.3 | — | — |
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 |
|---|---|---|---|---|---|---|---|---|
| WIBA1 | Batteries | BA | 12 | 12 | Mar 2025 | Operating | — | coming soon |
Owner / operator
Operator: On Energy Storage. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| On Energy Storage | 100.0% | 12 MW |
Nearby plants
Within 80 km.
| Mark One Power Station | 484 MW | 0.2 km |
| Myrtle Storage | 150 MW | 0.3 km |
| Myrtle Solar, LLC | — | 0.4 km |
| Gambit Energy Storage - Angleton Storage | 100 MW | 6.6 km |
| Angleton | 10 MW | 6.6 km |
| Cradle Solar | — | 7.7 km |