CAISO maintains its lead in the total installed capacity of battery energy storage systems. Two GW of grid-scale batteries reached full approval for commercial operations in the first half of 2025.
This brings the total installed capacity of batteries by rated power to 12.4GW.
The newly installed capacity comes from 18 new battery projects. One-third of these batteries are larger than 200MW in size.
For subscribers to Modo Energy’s US research this report highlights:
- A realistic breakdown of the 82 GW of BESS projects in CAISO’s queue to find out how much battery is likely to come online by 2025,
- Which companies led the last six months of buildout, and where they chose to build,
- And the full database of CAISO’s battery assets, with a data download available.
Disclaimer: This buildout report tracks standalone and co-located batteries operating within CAISO’s Balancing Area Authority.
If you have any questions about the content of the article, reach out to logan@modoenergy.com or brandt@modoenergy.com to get in touch with the US Research team.
