The design and application of utility-scale battery storage varies by region

About two-thirds of utility-scale battery storage power capacity installed in 2016 in the United States is located in two electricity markets: the California Independent System Operator (CAISO), which covers much of California, and the PJM Interconnection, which covers all or parts of 13 eastern states and the District of Columbia. Utility-scale battery systems have been installed in these markets for different reasons. More »