How many battery storage projects are in CAISO?

CAISO has 281 operating utility-scale battery storage projects with 17 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest battery storage project in CAISO?

Menifee Power Bank in Riverside County, California is the largest, at 680 MW. It came online in 2025.

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

54 battery storage projects came online in CAISO in 2025, with 4,956 MW of capacity.

Who is developing battery storage projects in CAISO?

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 CAISO

CAISO has 281 operating battery storage projects with 17 GW of capacity. 54 came online in 2025.

Operating281

See planned battery storage projects in CAISO

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

CAISO had 9 battery storage projects online in 2016 and 281 in 2026

109

145

198

252

281

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

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

The 10 largest battery storage projects in CAISO

Operating, by capacity

#	Battery storage project	Location	Year online	Capacity
1	Menifee Power Bank	Riverside County, California	2025	680 MW
2	Bellefield Solar and Energy Storage Farm	Kern County, California	2025	500 MW
3	Dynegy Moss Landing Power Plant Hybrid	Monterey County, California	2023	450 MW
4	Kola Energy Center	San Joaquin County, California	2025	400 MW
5	Easley Solar	Riverside County, California	2026	350 MW
6	Crimson	Riverside County, California	2022	350 MW
7	Desert Peak Energy Storage I	Riverside County, California	2023	325 MW
8	Nighthawk Energy Storage, LLC	San Diego County, California	2026	300 MW
9	Atlas VII	La Paz County, Arizona	2025	300 MW
10	Silver Peak	Clark County, Nevada	2025	279 MW

Battery storage projects that came online most recently in CAISO

Newest first

#	Battery storage project	Location	Year online	Capacity
1	Gonzaga Ridge Battery Facility	Merced County, California	2026	52 MW
2	Merced 2 BESS	Merced County, California	2026	2 MW
3	Aramis I Solar Project	Alameda County, California	2026	100 MW
4	Pacifico Power Lancaster 01	Los Angeles County, California	2026	1 MW
5	Pacifico Power Palmdale 01	Los Angeles County, California	2026	1 MW
6	Pastoria Power Bank	Kern County, California	2026	80 MW
7	Aratina Solar Center 1A	San Bernardino County, California	2026	75 MW
8	Deer Creek Hybrid	Tulare County, California	2026	51 MW
9	Aratina Solar Center 1B	San Bernardino County, California	2026	50 MW
10	Painter Energy Storage	Santa Barbara County, California	2026	10 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 CAISO

How many battery storage projects are in CAISO?: CAISO has 281 operating utility-scale battery storage projects with 17 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest battery storage project in CAISO?: Menifee Power Bank in Riverside County, California is the largest, at 680 MW. It came online in 2025.
How many battery storage projects were built in CAISO in 2025?: 54 battery storage projects came online in CAISO in 2025, with 4,956 MW of capacity.
Who is developing battery storage projects in CAISO?: 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.