Power Plants in Arizona

Arizona's power sector in numbers

Bywatts maps 71 operating power plants with 28.9 GW of nameplate capacity in Arizona. Natural Gas leads with 56% of that capacity across 23 plants, followed by Nuclear (15%) and Coal (12%). The inventory also includes 4 plants (2.4 GW) that EIA-860 lists as retired and 7 never built; the largest retired plant is NAVAJO (2,409 MW, retired 2019).

The largest operating plants are PALO VERDE (4,209 MW, Nuclear, ARIZONA PUBLIC SERVICE CO), SPRINGERVILLE (1,614 MW, Coal, TUCSON ELECTRIC POWER CO) and SANTAN (1,339 MW, Natural Gas, SALT RIVER PROJECT).

Of the 69 operating plants with a recorded commissioning year, 45 came online in 2000 or later and 29 in 2010 or later; the busiest decade for new capacity was the 2000s (9.8 GW).

The largest operators by operating capacity are ARIZONA PUBLIC SERVICE CO (17 plants, 8.9 GW), SALT RIVER PROJECT (11 plants, 5.2 GW) and U S BUREAU OF RECLAMATION (3 plants, 2.6 GW).

Retail electricity sales in Arizona reached 91.6 TWh in 2025, up 18.4% over ten years and up 0.8% year on year; residential customers took 42.7% of it. The average retail price across all sectors was 12.97 cents per kWh, up 25.4% since 2015.

The database also maps 419 named substations (44 of the 344 with a recorded voltage are rated 345 kV or above), 7 data centers (operators include Iron Mountain Data Centers, Centersquare and CyrusOne), 387 solar installers and 64 solar companies in Arizona.

Operating capacity by fuel

Retail electricity sales

Sources: HIFLD power-plant inventory (capacity, fuel, operator), EIA-860 (commissioning year, retirements, operable capacity), EIA retail sales and revenue series through January 2026. Counts are of plants Bywatts lists, not every generator in the state.