OCOTILLO

How OCOTILLO compares

With 810 MW of capacity, OCOTILLO ranks 12th among the 71 operating power plants Bywatts maps in Arizona and 7th of the 23 operating Natural Gas plants in the state. It accounts for about 5.0% of Arizona's operating Natural Gas capacity and 2.8% of all operating capacity in the state. Nationally it is the 149th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1972, it is older than 76% of the 69 operating Arizona plants with a recorded commissioning year. Its operator, ARIZONA PUBLIC SERVICE CO, runs 17 operating plants in Arizona totaling 8,906 MW. It shares Maricopa County with 28 other operating plants, including PALO VERDE and SANTAN.

EIA-860 lists 7 generators at the site with 806 MW of nameplate capacity, all natural gas fired combustion turbine technology. Net generation was 540 GWh in 2024 (a 7.6% capacity factor), down 30% from 2022. Its generators came online between 1972 and 2019.

Grid neighborhood

The nearest named substation is WARD (230 kV), about 0.1 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by SALT RIVER PROJECT, about 0.1 miles away. Another 6 operating power plants totaling 3,634 MW sit within 25 miles; the largest is SANTAN (1,339 MW, Natural Gas). Within 50 miles are 6 mapped data centers; the nearest is Centersquare Phoenix (PHX3) in Mesa, about 3.1 miles away.

Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology