Solar-Plus-Storage 101 | Department of Energy
From 2008 to 2017, the United States was the world leader in lithium-ion storage use, with about 1,000 MWh of storage, and 92% of it, or about 844 MWh, is deployed by utilities, according to the benchmark report. The average duration of utility-scale lithium-ion battery storage systems is 1.7 hours, but it can reach 4 hours.