Power plants in Arizona
Arizona has 191 power plants of 1 MW or more in the 2025 EIA-860 data, with 40.5 GW of nameplate capacity, the eighth-largest total among the 50 states and DC. Natural gas accounts for 43% of that capacity. The biggest single site is Palo Verde at 4,210 MW. Units that came online from 2020 to 2025 add 11.2 GW, led by battery storage at 44%. Units retired since 2016 at plants still operating total 445 MW, most of it natural gas.
- Natural gas17,386 MW43%
- Solar6,869 MW17%
- Battery storage4,951 MW12%
- Nuclear4,210 MW10%
- Coal2,792 MW6.9%
- Hydroelectric2,720 MW6.7%
- Wind1,234 MW3.0%
- Pumped-storage hydro194 MW0.5%
- Oil and petroleum125 MW0.3%
- Biomass and waste33.4 MW0.1%
What is running, by the decade it came online
NuclearCoalNatural gasOil and petroleumHydroelectricPumped-storage hydroWindSolarBattery storageBiomass and waste
Columns above the line show capacity still operating in 2025, stacked by fuel. Below the line: capacity retired in each decade at plants that still operate.
The 25 largest plants
| Rank | Plant | Runs on | Capacity | First unit | Operator |
|---|---|---|---|---|---|
| 1 | Palo Verde | Nuclear | 4,210 MW | 1986 | Arizona Public Service Co |
| 2 | Springerville | Coal | 1,779 MW | 1985 | Tucson Electric Power Co |
| 3 | Santan | Natural gas | 1,326 MW | 1974 | Salt River Project |
| 4 | Glen Canyon Dam | Hydroelectric | 1,312 MW | 1964 | U S Bureau of Reclamation |
| 5 | Harquahala Generating Project | Natural gas | 1,277 MW | 2004 | New Harquahala Generating Co, LLC |
| 6 | West Phoenix | Natural gas | 1,207 MW | 1972 | Arizona Public Service Co |
| 7 | Red Hawk | Natural gas | 1,127 MW | 2002 | Arizona Public Service Co |
| 8 | Hoover Dam (AZ) | Hydroelectric | 1,039 MW | 1936 | U S Bureau of Reclamation |
| 9 | Coronado | Coal | 822 MW | 1979 | Salt River Project |
| 10 | Ocotillo | Natural gas | 806 MW | 1972 | Arizona Public Service Co |
| 11 | Apache Station | Natural gas | 782 MW | 1963 | Arizona Electric Pwr Coop Inc |
| 12 | Sonoran Solar Energy | Solar | 750 MW | 2023 | Sonoran Solar Energy, LLC |
| 13 | Desert Basin | Natural gas | 745 MW | 2001 | Salt River Project |
| 14 | Agua Fria | Natural gas | 738 MW | 1957 | Salt River Project |
| 15 | Coolidge Generation Station | Natural gas | 726 MW | 2011 | Salt River Project |
| 16 | Arlington Valley Energy Facility | Natural gas | 713 MW | 2002 | Arlington Valley LLC |
| 17 | South Point Energy Center | Natural gas | 708 MW | 2001 | South Point Energy Center LLC |
| 18 | Sundance | Natural gas | 695 MW | 2002 | Arizona Public Service Co |
| 19 | Mesquite Generating Station Block 1 | Natural gas | 692 MW | 2003 | Salt River Project |
| 20 | Mesquite Generating Station Block 2 | Natural gas | 692 MW | 2003 | Mesquite Power LLC |
| 21 | Griffith Energy LLC | Natural gas | 655 MW | 2002 | Griffith Energy LLC |
| 22 | Gila River Power Block 1 | Natural gas | 619 MW | 2003 | Salt River Project |
| 23 | Gila River Power Block 2 | Natural gas | 619 MW | 2003 | Salt River Project |
| 24 | Gila River Power Block 3 | Natural gas | 619 MW | 2003 | Salt River Project |
| 25 | Gila River Power Block 4 | Natural gas | 619 MW | 2003 | Salt River Project |
Largest plant for each main fuel
| Main fuel | Plants | Capacity | Largest plant | Its capacity |
|---|---|---|---|---|
| Natural gas | 33 | 17.7 GW | Santan | 1,326 MW |
| Solar | 98 | 6,127 MW | Sonoran Solar Energy | 750 MW |
| Battery storage | 34 | 5,684 MW | Eleven Mile Solar Center | 600 MW |
| Nuclear | 1 | 4,210 MW | Palo Verde | 4,210 MW |
| Coal | 2 | 2,601 MW | Springerville | 1,779 MW |
| Hydroelectric | 8 | 2,679 MW | Glen Canyon Dam | 1,312 MW |
| Wind | 8 | 1,205 MW | Mohave County Wind Farm | 350 MW |
| Pumped-storage hydro | 3 | 235 MW | Horse Mesa | 131 MW |
| Oil and petroleum | 1 | 26.1 MW | Douglas | 26.1 MW |
| Biomass and waste | 3 | 33.4 MW | Novo BioPower Plant | 27.2 MW |
Balancing areas
| Area | Plants | Capacity |
|---|---|---|
| Salt River Project | 44 | 18.4 GW |
| Arizona Public Service | 67 | 8,231 MW |
| WAPA Desert Southwest | 19 | 5,699 MW |
| Tucson Electric Power | 46 | 4,149 MW |
| California ISO | 13 | 2,704 MW |
| Arlington Valley, LLC - AVBA | 1 | 713 MW |
| Griffith Energy, LLC | 1 | 655 MW |
Biggest operators here
| Operator | Plants | Capacity |
|---|---|---|
| Arizona Public Service Co | 20 | 9,270 MW |
| Salt River Project | 19 | 8,518 MW |
| Tucson Electric Power Co | 9 | 2,737 MW |
| U S Bureau of Reclamation | 3 | 2,606 MW |
| AES Clean Energy | 6 | 1,589 MW |
| New Harquahala Generating Co, LLC | 1 | 1,277 MW |
| Arizona Electric Pwr Coop Inc | 2 | 822 MW |
| Copia Power | 2 | 750 MW |
| Sonoran Solar Energy, LLC | 1 | 750 MW |
| Arlington Valley LLC | 1 | 713 MW |