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Coolidge Generation Station

Natural gas power plant · Pinal County, Arizona

Nameplate capacity

1,023 MW

Rank in Arizona

of 200 plants

In service since

2011

May 2011

Details

Primary fuel: Natural gas
Technology: Natural Gas Fired Combustion Turbine
Operator: Salt River Project
County: Pinal County
Generating units: 18
Share of state capacity: 2.38%
Rank among natural gas plants in Arizona: #5 of 33
EIA plant code: 56948

Generating units

Individual generating units at Coolidge Generation Station
Unit	Technology	Nameplate	Summer	Online	Status
1	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
10	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
11	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
12	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
2	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
3	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
4	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
5	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
6	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
7	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
8	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
9	Natural Gas Fired Combustion Turbine	61 MW	43 MW	2011	Operating
COE13	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating
COE14	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating
COE15	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating
COE16	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating
COE17	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating
COE18	Natural Gas Fired Combustion Turbine	50 MW	42 MW	2026	Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Arizona

Red Hawk	Natural gas	1,127 MW
Hoover Dam (AZ)	Hydro	1,039 MW
Coronado	Coal	822 MW
Ocotillo	Natural gas	806 MW

About this data

From EIA’s inventory of operable generators, June 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,023 MW solar plant and a 1,023 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Arizona power plants · What Arizona actually generates