How many solar farms are in CAISO?

CAISO has 872 operating utility-scale solar farms with 26 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest solar farm in CAISO?

Topaz Solar Farm in San Luis Obispo County, California is the largest, at 586 MW. It came online in 2014.

How many solar farms were built in CAISO in 2025?

56 solar farms came online in CAISO in 2025, with 1,847 MW of capacity.

Who is developing solar farms 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.

Solar farms in CAISO

CAISO has 872 operating solar farms with 26 GW of capacity. 56 came online in 2025.

Operating872

See planned solar farms in CAISO

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

CAISO had 367 solar farms online in 2016 and 872 in 2026

367

419

465

494

548

607

654

708

772

828

872

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

Solar farms online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest solar farms in CAISO

Operating, by capacity

#	Solar farm	Location	Year online	Capacity
1	Topaz Solar Farm	San Luis Obispo County, California	2014	586 MW
2	Bellefield Solar and Energy Storage Farm	Kern County, California	2025	500 MW
3	Agua Caliente Solar Project	Yuma County, Arizona	2014	348 MW
4	Solar Star 1	Kern County, California	2015	318 MW
5	Desert Sunlight 300, LLC	Riverside County, California	2014	314 MW
6	Desert Quartzite	Riverside County, California	2024	300 MW
7	Rexford Solar Farm	Tulare County, California	2025	300 MW
8	Daggett 3	San Bernardino County, California	2023	300 MW
9	McFarland B Solar and Storage	Yuma County, Arizona	2024	300 MW
10	Slate Hybrid	Kings County, California	2022	300 MW

Solar farms that came online most recently in CAISO

Newest first

#	Solar farm	Location	Year online	Capacity
1	ATLAS Solar VI, LLC	La Paz County, Arizona	2026	100 MW
2	7999 Gateway Solar	Alameda County, California	2026	5 MW
3	Perris DC 5 - sline015	Riverside County, California	2026	2 MW
4	Dominguez - SLLAX512	Los Angeles County, California	2026	1 MW
5	Ranch 4220	Kern County, California	2026	1 MW
6	Aramis I Solar Project	Alameda County, California	2026	100 MW
7	Pacifico Power Lancaster 01	Los Angeles County, California	2026	6 MW
8	Pacifico Power Palmdale 01	Los Angeles County, California	2026	3 MW
9	Lerdo East	Kern County, California	2026	2 MW
10	South Bay Dis Ctr 20-SLLAX512	Los Angeles County, California	2026	1 MW

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

How Cleanview tracks solar farms

Operating solar farms 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 solar farms in CAISO

How many solar farms are in CAISO?: CAISO has 872 operating utility-scale solar farms with 26 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest solar farm in CAISO?: Topaz Solar Farm in San Luis Obispo County, California is the largest, at 586 MW. It came online in 2014.
How many solar farms were built in CAISO in 2025?: 56 solar farms came online in CAISO in 2025, with 1,847 MW of capacity.
Who is developing solar farms 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.