Coolidge Generation Station
Natural gas power plant · Pinal County, Arizona
Nameplate capacity
726 MW
Rank in Arizona
#15
of 200 plants
In service since
2011
May 2011
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Salt River Project
- County
- Pinal County
- Generating units
- 12
- Share of state capacity
- 1.70%
- Rank among natural gas plants in Arizona
- #9 of 33
- EIA plant code
- 56948
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 10 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 11 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 12 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 2 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 3 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 4 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 5 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 6 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 7 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 8 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | Operating |
| 9 | Natural Gas Fired Combustion Turbine | 61 MW | 43 MW | 2011 | 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
| Desert Basin | Natural gas | 745 MW |
| Agua Fria | Natural gas | 738 MW |
| Arlington Valley Energy Facility | Natural gas | 713 MW |
| South Point Energy Center | Natural gas | 708 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 726 MW solar plant and a 726 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