3rd largest plant in Wyoming · 408th nationally
Dave Johnston is a coal power plant in Wyoming with a nameplate capacity of 817 MW. It generates roughly 3.5M MWh per year — enough to power about 336,894 average U.S. homes.
Its capacity factor of 49% puts it in the middle range — running steadily but not full-time. At 2576 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 (817 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 | Dave Johnston |
|---|---|
| Operator | Pacificorp |
| City | Glen Rock |
| County | Converse County |
| State | Wyoming |
| ZIP | 82637 |
| Coordinates | 42.83780, -105.77690 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| 4 | Conventional Steam Coal | Subbituminous Coal | 360 MW | Operating | 1972 |
| 3 | Conventional Steam Coal | Subbituminous Coal | 230 MW | Operating | 1964 |
| 1 | Conventional Steam Coal | Subbituminous Coal | 114 MW | Operating | 1959 |
| 2 | Conventional Steam Coal | Subbituminous Coal | 114 MW | Operating | 1961 |
| CO₂ | 4.6M metric tons |
|---|---|
| SO₂ | 5.5k metric tons |
| NOₓ | 4.3k metric tons |
| CO₂ Rate | 2576 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 | Pacificorp - East |
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.