Mesquite Generating Station Block 2
Natural gas power plant · Maricopa County, Arizona
Nameplate capacity
692 MW
Rank in Arizona
#20
of 200 plants
In service since
2003
December 2003
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Mesquite Power LLC
- County
- Maricopa County
- Generating units
- 3
- Share of state capacity
- 1.62%
- Rank among natural gas plants in Arizona
- #14 of 33
- EIA plant code
- 55481
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| ST2 | Natural Gas Fired Combined Cycle | 321 MW | 300 MW | 2003 | Operating |
| GT3 | Natural Gas Fired Combined Cycle | 185 MW | 162 MW | 2003 | Operating |
| GT4 | Natural Gas Fired Combined Cycle | 185 MW | 162 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
| Sundance | Natural gas | 695 MW |
| Mesquite Generating Station Block 1 | Natural gas | 692 MW |
| Griffith Energy LLC | Natural gas | 655 MW |
| Gila River Power Block 1 | 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 692 MW solar plant and a 692 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