7th largest plant in Arizona · 210th nationally
Harquahala Generating Project is a natural gas power plant in Arizona with a nameplate capacity of 1,277 MW. It generates roughly 2.3M MWh per year — enough to power about 221,568 average U.S. homes.
Its capacity factor of 21% reflects intermittent or peaking operation. At 833 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 (1,277 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 | Harquahala Generating Project |
|---|---|
| Operator | New Harquahala Generating Co, Llc |
| City | Tonopah |
| County | Maricopa County |
| State | Arizona |
| ZIP | 85354 |
| Coordinates | 33.47596, -113.11343 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| CTG1 | Natural Gas Fired Combined Cycle | Natural Gas | 282 MW | Operating | 2004 |
| CTG2 | Natural Gas Fired Combined Cycle | Natural Gas | 282 MW | Operating | 2004 |
| CTG3 | Natural Gas Fired Combined Cycle | Natural Gas | 282 MW | Operating | 2004 |
| STG1 | Natural Gas Fired Combined Cycle | Natural Gas | 144 MW | Operating | 2004 |
| STG2 | Natural Gas Fired Combined Cycle | Natural Gas | 144 MW | Operating | 2004 |
| STG3 | Natural Gas Fired Combined Cycle | Natural Gas | 144 MW | Operating | 2004 |
| Owner | Location | Share |
|---|---|---|
| Capital Power Corporation | Edmonton, AB | 5000.0% |
| Blackrock Inc. | New York, NY | 5000.0% |
Ownership reported to EIA Form 860. Percentages reflect reported generator-level ownership share, averaged when a plant has multiple generators.
| CO₂ | 968.6k metric tons |
|---|---|
| SO₂ | 5 metric tons |
| NOₓ | 79 metric tons |
| CO₂ Rate | 833 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 | New Harquahala Generating Company, Llc - Hgba |
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.