Cotulla BESS 1
Cotulla BESS 1 is a 10 MW battery storage project in La Salle County, Texas, operated by Marubeni Power International, Inc.. EIA-860M lists 1 generating unit here, inside ERCOT. Its unit entered service in 2026.
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
- 9.9 MW
- 9.9 MW net summer
- Generating units
- 1
- In service
- 2026
- EIA plant ID
- 69510
Where it is
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- County
- La Salle County, Texas
- Coordinates
- 28.4423, -99.2525
- Balancing authority
- ERCO
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Marubeni Power International, Inc.
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Every plant Marubeni Power International, Inc. reports to EIA →
Cotulla BESS 1: FAQ
- Where is Cotulla BESS 1?
- In La Salle 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 Cotulla BESS 1?
- 10 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Cotulla BESS 1?
- EIA-860M names Marubeni Power International, Inc. 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 Cotulla BESS 1 LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Marubeni Power International, Inc. 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 "Cotulla BESS 1 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Cotulla BESS 1 still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.