The CAISO (California Independent System Operator) grid is a good example of large scale battery use (1). Texas is also seeing a ramp up of battery storage (2).

Whilst battery demand will increase it's expected costs will continue to decrease - "Innovation reduces total capital costs of battery storage by up to 40% in the power sector by 2030 in the Stated Policies Scenario"(3)

1. https://www.gridstatus.io/live/caiso?date=2024-11-27 2. https://modoenergy.com/research/ercot-battery-energy-storage... 3. https://www.iea.org/reports/batteries-and-secure-energy-tran...