Power plants in the Salt River Project balancing area
The Salt River Project balancing area takes in 44 power plants with 18.4 GW of nameplate capacity, the 14th-largest of the 40 areas covered here. All of its plants are in Arizona. Natural gas makes up 54% of the mix, and the largest plant is Palo Verde (4,210 MW). Since 2020, 3,290 MW has come online here, 46% of it solar.
- Natural gas9,849 MW54%
- Nuclear4,210 MW23%
- Solar1,675 MW9.1%
- Battery storage1,333 MW7.3%
- Coal822 MW4.5%
- Wind226 MW1.2%
- Pumped-storage hydro154 MW0.8%
- Hydroelectric94.1 MW0.5%
Capacity by decade it came online
NuclearCoalNatural gasHydroelectricPumped-storage hydroWindSolarBattery storage
Above the line: capacity operating in 2025. Below: capacity retired at plants that still run.
The 25 largest plants in the area
| Rank | Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|---|
| 1 | Palo Verde | Arizona | Nuclear | 4,210 MW | 1986 |
| 2 | Santan | Arizona | Natural gas | 1,326 MW | 1974 |
| 3 | Harquahala Generating Project | Arizona | Natural gas | 1,277 MW | 2004 |
| 4 | Red Hawk | Arizona | Natural gas | 1,127 MW | 2002 |
| 5 | Coronado | Arizona | Coal | 822 MW | 1979 |
| 6 | Sonoran Solar Energy | Arizona | Solar | 750 MW | 2023 |
| 7 | Desert Basin | Arizona | Natural gas | 745 MW | 2001 |
| 8 | Agua Fria | Arizona | Natural gas | 738 MW | 1957 |
| 9 | Coolidge Generation Station | Arizona | Natural gas | 726 MW | 2011 |
| 10 | Mesquite Generating Station Block 1 | Arizona | Natural gas | 692 MW | 2003 |
| 11 | Mesquite Generating Station Block 2 | Arizona | Natural gas | 692 MW | 2003 |
| 12 | Gila River Power Block 1 | Arizona | Natural gas | 619 MW | 2003 |
| 13 | Gila River Power Block 2 | Arizona | Natural gas | 619 MW | 2003 |
| 14 | Gila River Power Block 4 | Arizona | Natural gas | 619 MW | 2003 |
| 15 | Eleven Mile Solar Center | Arizona | Battery storage | 600 MW | 2024 |
| 16 | Kyrene | Arizona | Natural gas | 596 MW | 1952 |
| 17 | Sierra Estrella Energy Storage | Arizona | Battery storage | 250 MW | 2024 |
| 18 | Storey Solar and Storage | Arizona | Solar | 210 MW | 2023 |
| 19 | Brittlebush Solar | Arizona | Solar | 200 MW | 2024 |
| 20 | Flatland Storage | Arizona | Battery storage | 200 MW | 2025 |
| 21 | Babbitt Ranch Energy Center | Arizona | Wind | 163 MW | 2024 |
| 22 | Horse Mesa | Arizona | Pumped-storage hydro | 131 MW | 1927 |
| 23 | Central Line Solar, LLC | Arizona | Solar | 100 MW | 2022 |
| 24 | East Line Solar | Arizona | Solar | 100 MW | 2020 |
| 25 | Saint Energy Storage II LLC | Arizona | Battery storage | 100 MW | 2023 |
States
| State | Plants | Capacity |
|---|---|---|
| Arizona | 44 | 18.4 GW |
Operators with the most capacity
| Operator | Plants | Capacity |
|---|---|---|
| Salt River Project | 18 | 7,899 MW |
| Arizona Public Service Co | 2 | 5,337 MW |
| New Harquahala Generating Co, LLC | 1 | 1,277 MW |
| Sonoran Solar Energy, LLC | 1 | 750 MW |
| Mesquite Power LLC | 1 | 692 MW |
| Eleven Mile Solar Center, LLC | 1 | 600 MW |
| Sierra Estrella Energy Storage, LLC | 1 | 250 MW |
| AES Distributed Energy | 3 | 245 MW |
| Storey Energy Center, LLC | 1 | 210 MW |
| Flatland Storage LLC | 1 | 200 MW |