Winmil Clean Energy Center (BESS)
Winmil Clean Energy Center (BESS) is a 12 MW battery storage project in Brazoria County, Texas, operated by On Energy Storage. EIA-860M lists 1 generating unit here, inside ERCOT. Its unit entered service in 2025.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 12 MW
- 12 MW net summer
- Generating units
- 1
- In service
- 2025
- EIA plant ID
- 69460
Where it is
Loading map…
- County
- Brazoria County, Texas
- Coordinates
- 29.2256, -95.4297
- Balancing authority
- ERCO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- On Energy Storage
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Winmil Clean Energy Center (BESS): FAQ
- Where is Winmil Clean Energy Center (BESS)?
- In Brazoria County, Texas (TX). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Winmil Clean Energy Center (BESS)?
- 12 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Winmil Clean Energy Center (BESS)?
- EIA-860M names On Energy Storage as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Winmil Clean Energy Center (BESS) LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — On Energy Storage here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Winmil Clean Energy Center (BESS) LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Winmil Clean Energy Center (BESS) still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.