The U.S. has experienced significant growth in large-scale battery capacity, which reached 1,650 MW by the end of 2020. According to data collected and analyzed by the U.S. Energy Information Administration (EIA), national battery power capacity grew by 35% in 2020 and has tripled in the last five years.

At the end of 2019, 163 large-scale battery storage systems were operating in the U.S., a 28% increase from 2018. The energy capacity of these sites was 1,688 MWh, and the maximum power that could be provided to the grid from these sites at any given moment was 1,022 MW. Declining technology costs have bolstered much of the recent growth, with battery storage costs falling by 72% between 2015 and 2019, a 27% per year rate of decline.

EIA projects that most large-scale battery energy storage systems expected to come online in the U.S. over the next three years will be co-located with photovoltaic power plants. If all currently announced projects from 2021 to 2023 become operational, then the share of U.S. battery storage that is co-located with generation would increase from 30% to 60%.

An additional 10,000 MW of large-scale battery storage’s ability to contribute electricity to the grid is likely to be installed between 2021 and 2023 in the U.S. — 10 times the total amount of maximum generation capacity by all systems in 2019.

To contact the author of this article, email shimmelstein@globalspec.com