- Combustion
- Operating
- 10 · 100 · 1,000 MW
Map
- Combustion
- Operating
Maddox: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Maddox
Power plant · Gas, steam turbine
Key facts
Power plant · Gas, steam turbineran 31% of 2025 Retiring- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1963
- Net generation, 2025
- 571,910 MWh
- Grid
- 115 kV to Southwestern Public Service Co (SWPP)
- Location
- Lea County, New Mexico
- Operated by
- Southwestern Public Service Co
Operations
- Net generation, 2025
- 571,910
MWh - Fuel burned, 2025
- 6,020,906
MMBtu - Capacity factor, 2025
- 30.8
% - Heat rate, 2025
- 10,528
Btu/kWh
| Year | Net generation (MWh) | Fuel burned (MMBtu) | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|---|
| 2026 (8 of 12 months) | 542,385 | 5,651,510 | — | 10,420 |
| 2025 | 571,910 | 6,020,906 | 30.8% | 10,528 |
| 2024 | 643,930 | 6,890,836 | 34.6% | 10,701 |
| 2023 | 704,524 | 8,353,688 | 37.9% | 11,857 |
| 2022 | 336,921 | 3,830,349 | 18.1% | 11,369 |
| 2021 | 345,187 | 3,901,784 | 18.6% | 11,303 |
| 2020 (11 of 12 months) | 610,457 | 7,128,981 | — | 11,678 |
| 2019 | 888,606 | 10,086,007 | 47.9% | 11,350 |
| 2018 | 555,196 | 6,429,208 | 29.9% | 11,580 |
| 2017 | 381,807 | 4,335,034 | 20.6% | 11,354 |
| 2016 | 320,707 | 3,730,142 | 17.2% | 11,631 |
| 2015 | 384,324 | 4,311,256 | 20.7% | 11,218 |
| 2014 | 419,237 | 4,608,314 | 22.6% | 10,992 |
| 2013 | 296,675 | 3,205,227 | 16.0% | 10,804 |
| 2012 | 479,025 | 5,162,905 | 25.7% | 10,778 |
| 2011 | 430,695 | 4,648,320 | 23.2% | 10,793 |
| 2010 | 439,269 | 5,021,132 | 23.6% | 11,431 |
| 2009 | 406,324 | 4,440,324 | 21.9% | 10,928 |
| 2008 | 547,936 | 5,821,943 | 29.4% | 10,625 |
| 2007 | 515,822 | 5,678,159 | 27.8% | 11,008 |
| 2006 | 634,645 | 7,250,095 | 34.2% | 11,424 |
| 2005 | 510,037 | 5,432,344 | 27.5% | 10,651 |
| 2004 | 557,034 | 5,872,536 | 29.9% | 10,542 |
| 2003 (11 of 12 months) | 482,390 | 5,223,764 | — | 10,829 |
| 2002 | 441,736 | 4,953,084 | 23.8% | 11,213 |
| 2001 | 636,864 | 6,722,136 | 34.3% | 10,555 |
How these are worked out
Net generation and fuel burned are the monthly figures EIA publishes in its bulk electricity file, from the plant's Form 923 reports; a year is the sum of its months. Capacity factor is a full year's net generation over today's nameplate capacity times the hours in that year (8,784 in a leap year), so a plant uprated or partly retired since reads against its current size; heat rate is fuel burned over net generation, for plants that burn fuel. A year with fewer than twelve months stated has no capacity factor, and a value outside the plausible range is left blank rather than shown. By month, the charts apply the same rules to each month's own hours and fuel.