11th largest plant in Arizona · 405th nationally
Coronado is a coal power plant in Arizona with a nameplate capacity of 822 MW. It generates roughly 3.1M MWh per year — enough to power about 293,536 average U.S. homes.
Its capacity factor of 43% puts it in the middle range — running steadily but not full-time. At 2599 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (822 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 | Coronado |
|---|---|
| Operator | Salt River Project |
| City | St Johns |
| County | Apache County |
| State | Arizona |
| ZIP | 85936 |
| Coordinates | 34.57890, -109.27080 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| CO1 | Conventional Steam Coal | Subbituminous Coal | 411 MW | Operating | 1979 |
| CO2 | Conventional Steam Coal | Subbituminous Coal | 411 MW | Operating | 1980 |
| CO₂ | 4.0M metric tons |
|---|---|
| SO₂ | 126 metric tons |
| NOₓ | 2.8k metric tons |
| CO₂ Rate | 2599 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 | Salt River Project |
Coal plants burn pulverized coal to boil water and spin steam turbines. They emit substantial CO₂, SO₂, and NOₓ along with mercury and particulate matter. Modern units include scrubbers and selective catalytic reduction; older units are increasingly being retired or converted to natural gas as economics shift.