Nameplate capacity
1,779 MW
Rank in Arizona
#2
of 200 plants
In service since
1985
June 1985
Details
- Primary fuel
- Coal
- Technology
- Conventional Steam Coal
- Operator
- Tucson Electric Power Co
- County
- Apache County
- Generating units
- 7
- Share of state capacity
- 4.16%
- Rank among coal plants in Arizona
- #1 of 2
- EIA plant code
- 8223
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 3 | Conventional Steam Coal | 458 MW | 417 MW | 2006 | Operating |
| 4 | Conventional Steam Coal | 458 MW | 415 MW | 2009 | Operating |
| 1 | Conventional Steam Coal | 425 MW | 381 MW | 1985 | Operating |
| 2 | Conventional Steam Coal | 425 MW | 406 MW | 1990 | Operating |
| WMS | Solar Photovoltaic | 8.3 MW | 8.5 MW | 2014 | Operating |
| SGSS | Solar Photovoltaic | 3.7 MW | 3.7 MW | 2001 | Operating |
| SGSS1 | Solar Photovoltaic | 1.4 MW | 1.6 MW | 2010 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Arizona
| Palo Verde | Nuclear | 4,210 MW |
| Santan | Natural gas | 1,326 MW |
| Glen Canyon Dam | Hydro | 1,312 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,779 MW solar plant and a 1,779 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Arizona power plants · What Arizona actually generates