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Hoover Dam (AZ)

Hydro power plant · Mohave County, Arizona

Nameplate capacity

1,039 MW

Rank in Arizona

of 200 plants

In service since

1936

September 1936

Details

Primary fuel: Hydro
Technology: Conventional Hydroelectric
Operator: U S Bureau of Reclamation
County: Mohave County
Generating units: 10
Share of state capacity: 2.43%
Rank among hydro plants in Arizona: #2 of 11
EIA plant code: 8902

Generating units

Individual generating units at Hoover Dam (AZ)
Unit	Technology	Nameplate	Summer	Online	Status
A1	Conventional Hydroelectric	130 MW	130 MW	1941	Operating
A2	Conventional Hydroelectric	130 MW	130 MW	1942	Operating
A3	Conventional Hydroelectric	130 MW	130 MW	1952	Operating
A4	Conventional Hydroelectric	130 MW	130 MW	1952	Operating
A6	Conventional Hydroelectric	130 MW	130 MW	1939	Operating
A7	Conventional Hydroelectric	130 MW	130 MW	1939	Operating
A5	Conventional Hydroelectric	127 MW	127 MW	1943	Operating
A9	Conventional Hydroelectric	69 MW	69 MW	1952	Operating
A8	Conventional Hydroelectric	62 MW	62 MW	1937	Operating
A0	Conventional Hydroelectric	2.4 MW	2.7 MW	1936	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

West Phoenix	Natural gas	1,207 MW
Red Hawk	Natural gas	1,127 MW
Coronado	Coal	822 MW
Ocotillo	Natural gas	806 MW

About this data

From EIA’s inventory of operable generators, May 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 1,039 MW solar plant and a 1,039 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