H Wilson Sundt Generating Station
Natural gas power plant · Pima County, Arizona
Nameplate capacity
529 MW
Rank in Arizona
#30
of 200 plants
In service since
1962
June 1962
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Steam Turbine
- Operator
- Tucson Electric Power Co
- County
- Pima County
- Generating units
- 14
- Share of state capacity
- 1.24%
- Rank among natural gas plants in Arizona
- #21 of 33
- EIA plant code
- 126
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 4 | Natural Gas Steam Turbine | 173 MW | 156 MW | 1967 | Operating |
| ST3 | Natural Gas Steam Turbine | 114 MW | 104 MW | 1962 | Operating |
| GT1 | Natural Gas Fired Combustion Turbine | 27 MW | 24 MW | 1972 | Operating |
| GT2 | Natural Gas Fired Combustion Turbine | 27 MW | 24 MW | 1972 | Operating |
| RIC1 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2020 | Operating |
| RIC10 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2019 | Operating |
| RIC2 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2020 | Operating |
| RIC3 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2020 | Operating |
| RIC4 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2020 | Operating |
| RIC5 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2020 | Operating |
| RIC6 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2019 | Operating |
| RIC7 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2019 | Operating |
| RIC8 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2019 | Operating |
| RIC9 | Natural Gas Internal Combustion Engine | 19 MW | 18 MW | 2019 | 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
| Sun Streams 4 | Solar | 600 MW |
| Kyrene | Natural gas | 574 MW |
| West Camp Wind Farm | Wind | 500 MW |
| Roadrunner Solar and BESS | Battery storage | 470 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 529 MW solar plant and a 529 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