How many hydro power plants are in Arizona?

Arizona has 11 operating utility-scale hydro power plants with 2.9 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest hydro power plant in Arizona?

Glen Canyon Dam in Coconino County, Arizona is the largest, at 1,312 MW. It came online in 1966.

How many hydro power plants were built in Arizona in 2025?

0 hydro power plants came online in Arizona in 2025, with 0 MW of capacity.

Who is developing hydro power plants in Arizona?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Hydro power plants in Arizona

Arizona has 11 operating hydro power plants with 2.9 GW of capacity.

Operating11

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Arizona had 11 hydro power plants online in 2016 and 11 in 2026

2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Hydro power plants online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest hydro power plants in Arizona

Operating, by capacity

#	Hydro power plant	County	Year online	Capacity
1	Glen Canyon Dam	Coconino County	1966	1,312 MW
2	Hoover Dam (AZ)	Mohave County	1952	1,039 MW
3	Davis Dam	Mohave County	1951	255 MW
4	Horse Mesa	Maricopa County	1927	131 MW
5	Mormon Flat	Maricopa County	1971	64 MW
6	Waddell	Maricopa County	1993	40 MW
7	Roosevelt	Maricopa County	1973	36 MW
8	Headgate Rock	La Paz County	1993	20 MW
9	Stewart Mountain	Maricopa County	1930	13 MW
10	Crosscut	Maricopa County	1939	3 MW

Hydro power plants that came online most recently in Arizona

Newest first

#	Hydro power plant	County	Year online	Capacity
1	Waddell	Maricopa County	1993	40 MW
2	Headgate Rock	La Paz County	1993	20 MW
3	South Consolidated	Maricopa County	1981	1 MW
4	Roosevelt	Maricopa County	1973	36 MW
5	Mormon Flat	Maricopa County	1971	64 MW
6	Glen Canyon Dam	Coconino County	1966	1,312 MW
7	Hoover Dam (AZ)	Mohave County	1952	1,039 MW
8	Davis Dam	Mohave County	1951	255 MW
9	Crosscut	Maricopa County	1939	3 MW
10	Stewart Mountain	Maricopa County	1930	13 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks hydro power plants

Operating hydro power plants come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about hydro power plants in Arizona

How many hydro power plants are in Arizona?: Arizona has 11 operating utility-scale hydro power plants with 2.9 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest hydro power plant in Arizona?: Glen Canyon Dam in Coconino County, Arizona is the largest, at 1,312 MW. It came online in 1966.
How many hydro power plants were built in Arizona in 2025?: 0 hydro power plants came online in Arizona in 2025, with 0 MW of capacity.
Who is developing hydro power plants in Arizona?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.