Harquahala 2
Harquahala 2 is a battery storage plant in Maricopa County, Arizona, operated by Copia Power. Among the 605 battery storage plants in the country it is the fourth-largest. It is the biggest of Arizona’s 34 battery storage plants. Of its current capacity, 600 MW came online between 2023 and 2025.
Nameplate capacity, 2025
600 MW
600 MW net summer capacity
2 operable units
- Battery300 MW50%
- Solar photovoltaic300 MW50%
Unit by unit, 2025 to 2025
operating in 2025bar height follows unit size
Unit BESS1 Battery, 300 MW, 2025
Unit PV1 Solar photovoltaic, 300 MW, 2025
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
- 25Gila River Power Block 4619 MW
- 26Eleven Mile Solar Center600 MW
- 27Harquahala 2this plant
- 28Sun Streams 4600 MW
- 29Kyrene596 MW
Other rankings
- All US power plants
- 604th of 14,286
- Power plants in Arizona
- 26th of 191
- Plants in the Arizona Public Service balancing area
- 4th of 68
- Plants run by Copia Power
- 1st of 2
- Biggest single unit, among Arizona’s plants
- 11th of 191
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| BESS1 | Battery | 300 MW | 300 MW | 2025 | Operating |
| PV1 | Solar photovoltaic | 300 MW | 300 MW | 2025 | Operating |
Grid and site
- Balancing area
- Arizona Public Service
- Reliability region
- Western Electricity Coordinating Council
- Highest grid connection voltage
- 250 kV
- Nearest town on record
- Tonopah
- Operator type
- Independent producer
- Coordinates
- 33.460°N, 113.110°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Harquahala Generating Project | Natural gas | 1,277 MW | 1.1 mi north |
| Harquahala Sun Solar Project | Solar | 150 MW | 2.0 mi southwest |
| Papago Energy Storage | Battery storage | 300 MW | 4.5 mi east |
| Saddle Mountain Solar I | Solar | 15 MW | 7.0 mi southwest |
| Mesquite Solar 3, LLC | Solar | 150 MW | 12.7 mi southeast |
| Mesquite Solar 4, LLC | Solar | 62.5 MW | 14.4 mi southeast |
| Mesquite Solar 1 | Solar | 170 MW | 14.4 mi southeast |
| Mesquite Solar 2, LLC | Solar | 100 MW | 14.4 mi southeast |