San Miguel
Atascosa County, Texas · EIA plant ID 6183 · Operator: San Miguel Electric Coop, Inc
Nameplate410MWSummer 391 MW
Generators1in service
Net generation1,276GWh12 mo to Aug 2026
Capacity factor37%gas/coal/oil units, summer MW
Heat rate13,680Btu/kWhfossil units, electric fuel, HHV
First online1982Runs as intermediate
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 2,824 | 82.5% | 12,362 |
| 2002 | 2,855.1 | 83.4% | 12,081 |
| 2003 | 2,688.8 | 78.5% | 11,893 |
| 2004 | 2,648.7 | 77.1% | 11,887 |
| 2005 | 2,850.7 | 83.2% | 12,152 |
| 2006 | 2,937.2 | 85.8% | 13,136 |
| 2007 | 2,713.9 | 79.2% | 12,402 |
| 2008 | 2,706.1 | 78.8% | 12,914 |
| 2009 | 2,861.8 | 83.5% | 12,207 |
| 2010 | 2,859.4 | 83.5% | 11,945 |
| 2011 | 2,952.8 | 86.2% | 12,109 |
| 2012 | 2,901.5 | 84.5% | 11,909 |
| 2013 | 2,678.8 | 78.2% | 11,479 |
| 2014 | 2,173 | 63.4% | 11,518 |
| 2015 | 2,169.6 | 63.3% | 12,692 |
| 2016 | 2,351.9 | 68.5% | 12,804 |
| 2017 | 2,557 | 74.7% | 12,383 |
| 2018 | 2,509.4 | 73.3% | 12,355 |
| 2019 | 2,071.9 | 60.5% | 13,345 |
| 2020 | 2,318.1 | 67.5% | 12,784 |
| 2021 | 1,903.1 | 55.6% | 13,731 |
| 2022 | 2,099.4 | 61.3% | 12,035 |
| 2023 | 1,384.1 | 40.4% | 13,527 |
| 2024 | 1,305.1 | 38.0% | 12,999 |
| 2025 | 1,421.2 | 41.5% | 12,992 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Steam Coal | ST | 410 | 391 | Jan 1982 | Operating | — | coming soon |
Owner / operator
Operator: San Miguel Electric Coop, Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| San Miguel Electric Coop, Inc | 100.0% | 410 MW |
Nearby plants
Within 80 km.
| Reis Solar Park | — | 6.2 km |
| Poteet | 10 MW | 39.3 km |
| Regis Lyssy | 10 MW | 40.4 km |
| Sparta Solar | 250 MW | 46.8 km |
| Helena Wind | 268 MW | 53.5 km |
| FELPS 7- Floresville West | 1 MW | 55.2 km |