# San Miguel

ERCOT asset profile · https://askthegrid.com/assets/facilities/san-miguel

San Miguel Electric Cooperative · Atascosa County · ERCOT

San Miguel is a single-unit lignite-fired steam plant in Atascosa County, Texas. EIA's May 2026 inventory reports 410 MW nameplate and 391 MW net summer and winter capability, with a January 1982 operating date. San Miguel Electric Cooperative owns and operates the plant and describes 391 net MW. The cooperative has received USDA New ERA support for a planned transition that includes 400 MW of solar and 200 MW of battery storage; those replacement projects are future scope and are not part of the operating coal unit's current capacity.

## Profile

- **Grid role:** Member-owned dispatchable lignite generation serving rural electric cooperatives in ERCOT.
- **Operating configuration:** One conventional steam-coal generator fueled by locally mined lignite.
- **Capacity scope:** EIA reports 410 MW nameplate and 391 MW net summer and winter capability; the cooperative also reports 391 net MW.
- **Planned transition:** USDA-supported plans call for 400 MW of solar and 200 MW of battery storage; these are future replacement resources, not current coal-unit capacity.

## Metrics

- **Net summer capacity:** 391 MW — EIA May 2026
- **Nameplate capacity:** 410 MW — EIA May 2026
- **Net winter capacity:** 391 MW — EIA May 2026
- **Operating generators:** 1 — Lignite-fired steam unit
- **Planned solar:** 400 MW — USDA New ERA plan
- **Planned storage:** 200 MW — USDA New ERA plan

## Facts

- **Net capacity:** 391 MW — EIA and cooperative · confidence: high
- **Nameplate capacity:** 410 MW — EIA May 2026 · confidence: high
- **Owner and operator:** San Miguel Electric Cooperative — Cooperative · confidence: high
- **Planned transition:** 400 MW solar + 200 MW battery — USDA New ERA plan · confidence: high

## Sources

- [EIA May 2026 generator inventory](https://www.eia.gov/electricity/data/eia860m/) — U.S. Energy Information Administration · regulatory — Current generator records, capacity scopes, dates, status, operator, and technology.

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Canonical page: https://askthegrid.com/assets/facilities/san-miguel
Website: [San Miguel Electric Cooperative](https://smeci.net/)
Profile published: 2026-07-17T03:34:46.484Z
Source: Ask the Grid — https://askthegrid.com/