Nameplate capacity
1,326 MW
Rank in Arizona
#3
of 200 plants
In service since
1974
October 1974
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Salt River Project
- County
- Maricopa County
- Generating units
- 9
- Share of state capacity
- 3.10%
- Rank among natural gas plants in Arizona
- #1 of 33
- EIA plant code
- 8068
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| ST5S | Natural Gas Fired Combined Cycle | 315 MW | 290 MW | 2005 | Operating |
| ST5A | Natural Gas Fired Combined Cycle | 154 MW | 163 MW | 2005 | Operating |
| ST5B | Natural Gas Fired Combined Cycle | 154 MW | 163 MW | 2005 | Operating |
| ST6A | Natural Gas Fired Combined Cycle | 154 MW | 171 MW | 2006 | Operating |
| ST6S | Natural Gas Fired Combined Cycle | 136 MW | 131 MW | 2006 | Operating |
| ST1 | Natural Gas Fired Combined Cycle | 104 MW | 92 MW | 1974 | Operating |
| ST2 | Natural Gas Fired Combined Cycle | 104 MW | 92 MW | 1974 | Operating |
| ST3 | Natural Gas Fired Combined Cycle | 104 MW | 92 MW | 1974 | Operating |
| ST4 | Natural Gas Fired Combined Cycle | 104 MW | 92 MW | 1975 | 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 |
| Springerville | Coal | 1,779 MW |
| Glen Canyon Dam | Hydro | 1,312 MW |
| Harquahala Generating Project | Natural gas | 1,277 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 1,326 MW solar plant and a 1,326 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