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U.S. large-scale battery storage capacity by region 2018

PJM Interconnection has the largest capacity of large-scale battery storage installations in the United States. As of 2018, it owned a total of 282 megawatts. PJM Interconnection has facilities throughout the states of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia. The second highest power capacity in large-scale facilities was seen in the California Independent System Operator region, at 180 megawatts.

Independent power producers hold the greatest large-scale battery capacity in the country.

Power capacity of large-scale battery storage installations in the United States as of 2018, by region*

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Release date

July 2020


United States

Survey time period


Supplementary notes

* The source adds:
Large‐scale refers to systems that are grid connected and have a nameplate power capacity greater than 1 MW.
ISOs and RTOs are independent, federally regulated non‐profit organizations that ensure reliability and optimize supply and demand bids for wholesale electric power.

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