Wilkes
Marion County, Texas · EIA plant ID 3478 · Operator: Southwestern Electric Power Co
Nameplate882MWSummer 883 MW
Generators3in service
Net generation995GWh12 mo to Dec 2025
Capacity factor13%gas/coal/oil units, summer MW
Heat rate11,220Btu/kWhfossil units, electric fuel, HHV
First online1964Runs as peaking
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 | 2,013 | 26.1% | 11,148 |
| 2002 | 1,394 | 18.0% | 11,003 |
| 2003 | 1,595 | 20.6% | 10,971 |
| 2004 | 949.6 | 12.3% | 11,082 |
| 2005 | 1,709.8 | 22.1% | 10,805 |
| 2006 | 1,522.2 | 19.7% | 10,813 |
| 2007 | 1,061.2 | 13.8% | 11,498 |
| 2008 | 950.2 | 12.1% | 11,655 |
| 2009 | 1,043.2 | 13.5% | 11,897 |
| 2010 | 1,542.3 | 19.9% | 11,165 |
| 2011 | 1,359.3 | 17.6% | 11,433 |
| 2012 | 1,202.6 | 15.5% | 11,708 |
| 2013 | 1,281.8 | 16.6% | 11,687 |
| 2014 | 774 | 10.0% | 12,088 |
| 2015 | 663.8 | 8.6% | 12,130 |
| 2016 | 576.6 | 7.4% | 11,800 |
| 2017 | 408.4 | 5.3% | 12,814 |
| 2018 | 577.4 | 7.5% | 11,722 |
| 2019 | 630.9 | 8.2% | 11,597 |
| 2020 | 700.9 | 9.0% | 11,888 |
| 2021 | 885.6 | 11.5% | 11,496 |
| 2022 | 1,036.6 | 13.4% | 10,894 |
| 2023 | 1,114.9 | 14.4% | 11,243 |
| 2024 | 1,190.3 | 15.3% | 11,138 |
| 2025 | 995.4 | 12.9% | 11,220 |
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 | Natural Gas Steam Turbine | ST | 180 | 174 | May 1964 | Operating | — | coming soon |
| 2 | Natural Gas Steam Turbine | ST | 351 | 355 | May 1970 | Operating | — | coming soon |
| 3 | Natural Gas Steam Turbine | ST | 351 | 354 | Dec 1971 | Operating | — | coming soon |
Owner / operator
Operator: Southwestern Electric Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Southwestern Electric Power Co | 100.0% | 882 MW |
Nearby plants
Within 80 km.
| Hecate Energy Upshur Rural LLC | 3 MW | 17.2 km |
| Lone Star | retired | 18.2 km |
| Snider Industries | 5 MW | 34.5 km |
| Welsh | 1,116 MW | 35.7 km |
| Pirkey | retired | 43.5 km |
| Hallsville | — | 43.5 km |