Harquahala Generating Project
Harquahala Generating Project is a natural gas plant in Maricopa County, Arizona, operated by New Harquahala Generating Co, LLC. It ranks fifth by nameplate capacity among Arizona’s 191 power plants. Within the Salt River Project balancing area it is the third-largest of 44 plants.
Nameplate capacity, 2025
1,277 MW
1,043 MW net summer capacity
6 operable units
- Gas combined cycle1,277 MW100%
Unit by unit, 2004 to 2025
operating in 2025bar height follows unit size
Unit CTG1 Gas combined cycle, 282 MW, 2004
Unit CTG2 Gas combined cycle, 282 MW, 2004
Unit CTG3 Gas combined cycle, 282 MW, 2004
Unit STG1 Gas combined cycle, 144 MW, 2004
Unit STG2 Gas combined cycle, 144 MW, 2004
Unit STG3 Gas combined cycle, 144 MW, 2004
Among Arizona’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Palo Verde4,210 MW
- 2Springerville1,779 MW
- 3Santan1,326 MW
- 4Glen Canyon Dam1,312 MW
- 5Harquahala Generating Projectthis plant
- 6West Phoenix1,207 MW
- 7Red Hawk1,127 MW
Other rankings
- All US power plants
- 197th of 14,286
- US natural gas plants
- 81st of 1,961
- Natural gas plants in Arizona
- 2nd of 33
- Biggest single unit, among Arizona’s plants
- 17th of 191
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CTG1 | Gas combined cycle | 282 MW | 240 MW | 2004 | Operating |
| STG1 | Gas combined cycle | 144 MW | 120 MW | 2004 | Operating |
| CTG3 | Gas combined cycle | 282 MW | 226 MW | 2004 | Operating |
| STG3 | Gas combined cycle | 144 MW | 116 MW | 2004 | Operating |
| CTG2 | Gas combined cycle | 282 MW | 227 MW | 2004 | Operating |
| STG2 | Gas combined cycle | 144 MW | 115 MW | 2004 | Operating |
Who owns it
Shares are weighted by the nameplate capacity of each unit an owner holds.
| Owner | Share of capacity |
|---|---|
| Capital Power Corporation | 50.0% |
| BlackRock Inc. | 50.0% |
Grid and site
- Balancing area
- Salt River Project
- Reliability region
- Western Electricity Coordinating Council
- Highest grid connection voltage
- 525 kV
- Water source
- Central Arizona Project/Well
- Nearest town on record
- Tonopah
- Operator type
- Independent producer
- Coordinates
- 33.476°N, 113.113°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Harquahala 2 | Battery storage | 600 MW | 1.1 mi south |
| Harquahala Sun Solar Project | Solar | 150 MW | 2.7 mi southwest |
| Papago Energy Storage | Battery storage | 300 MW | 4.4 mi east |
| Saddle Mountain Solar I | Solar | 15 MW | 7.8 mi southwest |
| Mesquite Solar 3, LLC | Solar | 150 MW | 13.5 mi southeast |
| Mesquite Solar 1 | Solar | 170 MW | 15.2 mi southeast |
| Mesquite Solar 4, LLC | Solar | 62.5 MW | 15.3 mi southeast |
| Mesquite Solar 2, LLC | Solar | 100 MW | 15.3 mi southeast |