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.
Overview
Key fields
- 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
Resource stack
- 1 resource
SANMIGL_G1
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.
Structured profile
- Net capacity
- 391 MW
EIA and cooperative
- Nameplate capacity
- 410 MW
EIA May 2026
- Owner and operator
- San Miguel Electric Cooperative
Cooperative
- Planned transition
- 400 MW solar + 200 MW battery
USDA New ERA plan
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 410 MW 391 MW summer | Conventional Steam Coal Lignite · ST | Jan 1982 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 410 MW
- National rank
- #134
- TX rank
- #10
Monthly generation
Download CSVMonthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
ERCOT disclosed dispatch
1 ERCOT market resource · Coal / lignite
Generation
3 mo through May 22, 2026Capacity factor is average output vs. this plant's observed peak.
Output by hourlocal time · 90 days through May 22, 2026
Latest disclosed outputhourly · 2 weeks ending May 22, 2026
Generation from ERCOT's 60-Day SCED Disclosure (≈60-day lag), summed over this site's market resources.
Grid and market context
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Market registration
ERCOT public disclosuresOperating context
ERCOT market recordsNearby substations
HIFLD infrastructure inventoryCommercial, land, and environmental record
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Land and environmental record
Related parties and identifiers
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Market resources | SANMIGL_G1 | Linked ERCOT resources. |
| Grid selection | plant:plant-6183 | Canonical asset page /ercot/assets/plant/san-miguel. |
Reporting portfolio
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- Coal unit entered serviceEIA May 202...
EIA reports January 1982 for the operating generator record.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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