28th largest plant in Arizona · 708th nationally
H Wilson Sundt Generating Station is a natural gas power plant in Arizona with a nameplate capacity of 529 MW. It generates roughly 1.4M MWh per year — enough to power about 132,470 average U.S. homes.
Its capacity factor of 30% reflects intermittent or peaking operation. At 760 lb CO₂/MWh, its emission rate sits below the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (529 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | H Wilson Sundt Generating Station |
|---|---|
| Operator | Tucson Electric Power Co |
| City | Tucson |
| County | Pima County |
| State | Arizona |
| ZIP | 85714 |
| Coordinates | 32.16000, -110.90470 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 4 | Natural Gas Steam Turbine | Natural Gas | 173 MW | Operating | 1967 |
| ST3 | Natural Gas Steam Turbine | Natural Gas | 114 MW | Operating | 1962 |
| ST1 | Natural Gas Steam Turbine | Natural Gas | 109 MW | Retired | 1958 |
| ST2 | Natural Gas Steam Turbine | Natural Gas | 109 MW | Retired | 1960 |
| GT1 | Natural Gas Fired Combustion Turbine | Natural Gas | 27.0 MW | Operating | 1972 |
| GT2 | Natural Gas Fired Combustion Turbine | Natural Gas | 27.0 MW | Operating | 1972 |
| RIC1 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2020 |
| RIC10 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2019 |
| RIC2 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2020 |
| RIC3 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2020 |
| RIC4 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2020 |
| RIC5 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2020 |
| RIC6 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2019 |
| RIC7 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2019 |
| RIC8 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2019 |
| RIC9 | Natural Gas Internal Combustion Engine | Natural Gas | 18.8 MW | Operating | 2019 |
| CO₂ | 528.2k metric tons |
|---|---|
| SO₂ | 16 metric tons |
| NOₓ | 806 metric tons |
| CO₂ Rate | 760 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | WECC |
|---|---|
| Balancing Authority | Tucson Electric Power Company |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.