How many battery storage projects are in Arizona?

Arizona has 57 operating utility-scale battery storage projects with 6.9 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest battery storage project in Arizona?

Eleven Mile Solar Center in Pinal County, Arizona is the largest, at 300 MW. It came online in 2024.

How many battery storage projects were built in Arizona in 2025?

16 battery storage projects came online in Arizona in 2025, with 2,912 MW of capacity.

Who is developing battery storage projects 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.

Battery storage projects in Arizona

Arizona has 57 operating battery storage projects with 6.9 GW of capacity. 16 came online in 2025.

Operating57

See planned battery storage projects in Arizona

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Arizona had 2 battery storage projects online in 2017 and 57 in 2026

2017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Battery storage projects online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest battery storage projects in Arizona

Operating, by capacity

#	Battery storage project	County	Year online	Capacity
1	Eleven Mile Solar Center	Pinal County	2024	300 MW
2	Papago Energy Storage	Maricopa County	2025	300 MW
3	Sun Streams 4	Maricopa County	2025	300 MW
4	Harquahala 2	Maricopa County	2025	300 MW
5	Atlas VII	La Paz County	2025	300 MW
6	Centennial Flats	La Paz County	2026	267 MW
7	Sonoran Solar Energy	Maricopa County	2023	260 MW
8	Sierra Estrella Energy Storage	Maricopa County	2024	250 MW
9	Beehive Energy Storage	Maricopa County	2026	250 MW
10	Catclaw Solar	Maricopa County	2026	250 MW

Battery storage projects that came online most recently in Arizona

Newest first

#	Battery storage project	County	Year online	Capacity
1	Desert Bloom	Maricopa County	2026	150 MW
2	Centennial Flats	La Paz County	2026	267 MW
3	Catclaw Solar	Maricopa County	2026	250 MW
4	Roadrunner Reserve Phase 2	Pima County	2026	200 MW
5	Justice Energy Storage	Maricopa County	2026	150 MW
6	Beehive Energy Storage	Maricopa County	2026	250 MW
7	Pediment BESS I	Maricopa County	2026	250 MW
8	Wilmot Energy Center II	Pima County	2026	100 MW
9	Sun Pond	Maricopa County	2026	85 MW
10	Roadrunner Solar and BESS	Cochise County	2026	235 MW

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

How Cleanview tracks battery storage projects

Operating battery storage projects 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 battery storage projects in Arizona

How many battery storage projects are in Arizona?: Arizona has 57 operating utility-scale battery storage projects with 6.9 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest battery storage project in Arizona?: Eleven Mile Solar Center in Pinal County, Arizona is the largest, at 300 MW. It came online in 2024.
How many battery storage projects were built in Arizona in 2025?: 16 battery storage projects came online in Arizona in 2025, with 2,912 MW of capacity.
Who is developing battery storage projects 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.