Demoss Petrie
Natural gas power plant · Pima County, Arizona
Nameplate capacity
85 MW
Rank in Arizona
#91
of 200 plants
In service since
2001
June 2001
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Tucson Electric Power Co
- County
- Pima County
- Generating units
- 1
- Share of state capacity
- 0.20%
- Rank among natural gas plants in Arizona
- #28 of 33
- EIA plant code
- 124
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GT2 | Natural Gas Fired Combustion Turbine | 85 MW | 75 MW | 2001 | 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
| Perrin Ranch Wind LLC | Wind | 99 MW |
| Superstition Energy Storage | Battery storage | 90 MW |
| Scatter Wash 2 | Battery storage | 85 MW |
| Red Rock | Solar | 85 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 85 MW solar plant and a 85 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