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410 MW Lignite operating in Atascosa, TX
410 MW
Nameplate Capacity
1
Generators
unit
Conventional Steam Coal
Technology
1982
Operating Since
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | San Miguel Electric Coop, Inc | — | — |
| Owner(s) | San Miguel Electric Coop, Inc | — | — |
| Status | Operating | — | — |
The San Miguel power plant is a 410 MW conventional steam coal facility located in Atascosa County, Texas. The plant began operating in 1982 and has one generator. It is owned and operated by San Miguel Electric Coop, Inc. The primary fuel source for the plant is lignite (LIG).
In the most recent year with available data, the San Miguel plant generated 1,421,219 MWh of electricity, achieving a capacity factor of 39.5%. The plant operates within the Electric Reliability Council of Texas, Inc. (ERCOT) balancing authority. San Miguel ranks as the second-largest of three lignite plants in Texas, and seventh-largest of eight lignite plants nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
ERCOT
Market
ISO/RTO Member
NERC Region
TRE — Texas Reliability Entity
Balancing Authority
Electric Reliability Council of Texas, Inc. (ERCO)
Grid Voltage
345.0 kV
Regulatory Status
RE — Regulated
Entity Type
Cooperative
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
107.8K MWh
Latest Month
1.4M MWh
Annual Generation
39.5%
Capacity Factor
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CO₂ Intensity
2850 lb/MWh
NOx
2 lb/MWh
SO₂
7 lb/MWh
CH₄
0.328 lb/MWh
N₂O
0.048 lb/MWh
Capacity Factor
38.5%
Annual Net Gen
1384 GWh
CO₂eq
2872 lb/MWh
Subregion
ERCOT All
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Point of Interconnection
Nearest Substation
San Miguel Switchyard · 345 kV
Substation Distance
< 10 km
Operator
South Texas Electric Cooperative
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ERCOT
LMP Node
SAN_SANMIGG1
Pricing Hub
HB_SOUTH
Alt. Hub / Zone
LZ_SOUTH
Location Type
Resource Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
View all 5 articlesForward forecasts, scenario decomposition, and risk-decision tooling for this asset.