Gila River Power Block 1
Natural gas power plant · Maricopa County, Arizona
Nameplate capacity
619 MW
Rank in Arizona
#22
of 200 plants
In service since
2003
May 2003
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Salt River Project
- County
- Maricopa County
- Generating units
- 3
- Share of state capacity
- 1.45%
- Rank among natural gas plants in Arizona
- #16 of 33
- EIA plant code
- 59338
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| ST9 | Natural Gas Fired Combined Cycle | 271 MW | 242 MW | 2003 | Operating |
| CTG1 | Natural Gas Fired Combined Cycle | 174 MW | 164 MW | 2003 | Operating |
| CTG2 | Natural Gas Fired Combined Cycle | 174 MW | 164 MW | 2003 | 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
| Mesquite Generating Station Block 2 | Natural gas | 692 MW |
| Griffith Energy LLC | Natural gas | 655 MW |
| Gila River Power Block 2 | Natural gas | 619 MW |
| Gila River Power Block 3 | Natural gas | 619 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 619 MW solar plant and a 619 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