Installed large-scale battery storage systems in the United States reached an all-time high as of the end of 2018. According to the EIA, a total of 125 installed battery storage systems having a combined capacity of 869 MW were operational in the US as of 2018. These figures are a significant increase compared to 2010 when only 7 storage systems having 59 MW of combined capacity were installed.
Technological advancements, regulatory requirements, and synergies are fueling the growth. Additionally, the average installed cost of large-scale battery storage systems has decreased substantially from $2,153 per kWh in 2015 to $834 per kWh in 2017. As a result, new battery storage capacity additions are expected to continue. More than 3,600 MW of large-scale battery storage capacity additions are planned between 2020 and 2023, according to the EIA.