How many battery storage projects are planned in CAISO?

Developers have proposed 399 battery storage projects in CAISO with 119 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.

What is the largest planned battery storage project in CAISO?

Atlas Complex in La Paz County, Arizona is the largest planned, at 2,171 MW. It is expected to come online in 2028.

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.

Planned battery storage projects in CAISO

Developers have proposed 399 battery storage projects in CAISO with 119 GW of capacity, in the grid operators' interconnection queues.

Planned399

See operating 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.

More planned battery storage projects in CAISO are expected online in 2028 than in any other year

2026’262027’272028’282029’292030’302031’312032’322033’33

Planned battery storage projects by the year they're expected online. Source: the grid operators' interconnection queues, compiled by Cleanview.

The 10 largest planned battery storage projects in CAISO

Planned, by capacity

#	Battery storage project	Location	Expected online	Capacity
1	Atlas Complex	La Paz County, Arizona	2028	2,171 MW
2	Wingtip Solar 1	Merced County, California	2032	1,176 MW
3	Quark	Fresno County, California	2028	1,175 MW
4	Boson	Kern County, California	2028	1,173 MW
5	Muon	Fresno County, California	2028	1,170 MW
6	Pion	Fresno County, California	2028	1,168 MW
7	Angeleno Solar Farm	Los Angeles County, California	2028	1,150 MW
8	Darden	Fresno County, California	2027	1,150 MW
9	Umbriel	Imperial County, California	2033	1,150 MW
10	Hillside Energy Storage	Los Angeles County, California	2029	1,065 MW

Planned battery storage projects expected online soonest in CAISO

In the next 18 months, soonest first

#	Battery storage project	Location	Expected online	Capacity
1	Sanborn Hybrid 3	Kern County, California	2026	672 MW
2	Sonrisa	Fresno County, California	2026	184 MW
3	Reclaimed Wind	Alameda County, California	2026	114 MW
4	Aratina Solar Center 2	Kern County, California	2026	113 MW
5	Huaso Hybrid	Fresno County, California	2026	102 MW
6	Golden Fields Solar	Kern County, California	2026	100 MW
7	Gaskell West	Kern County, California	2026	62 MW
8	Golden Fields Solar	Kern County, California	2026	49 MW
9	Golden Fields Solar	Kern County, California	2026	44 MW
10	Sunshine Valley Solar 1	Nye County, Nevada	2026	40 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 planned in CAISO?: Developers have proposed 399 battery storage projects in CAISO with 119 GW of capacity, according to the grid operators' interconnection queues. Most queue projects are never built.
What is the largest planned battery storage project in CAISO?: Atlas Complex in La Paz County, Arizona is the largest planned, at 2,171 MW. It is expected to come online in 2028.
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.