What is an energy storage system?

An energy storage system (ESS) for electricity generation uses electricity (or some other energy source, such as solar-thermal energy) to charge an energy storage system or device, which is discharged to supply (generate) electricity when needed at desired levels and quality. ESSs provide a variety of services to support electric power grids.

What is the power capacity of a battery energy storage system?

As of the end of 2022, the total nameplate power capacity of operational utility-scale battery energy storage systems (BESSs) in the United States was 8,842 MW and the total energy capacity was 11,105 MWh. Most of the BESS power capacity that was operational in 2022 was installed after 2014, and about 4,807 MW was installed in 2022 alone.

What is a battery storage system?

Many battery storage systems, and flywheels and super capacitors, provide rapid response to electricity demand fluctuations on sub-hourly timescales—from a few minutes down to fractions of a second—to keep grid voltage and frequency characteristics within a narrow range and provide an expected level of power quality.

What is a pumped-storage hydroelectric system?

Pumped-storage hydroelectric (PSH) systems are the oldest and some of the largest (in power and energy capacity) utility-scale ESSs in the United States and most were built in the 1970’s.

How many energy storage projects are planned in 2023?

All other planned energy storage projects reported to EIA in various stages of development are BESS projects and have a combined total nameplate power capacity additions of 22,255 MW planned for installation in 2023 through 2026. About 13,881 MW of that planned capacity is co-located with solar photovoltaic generators.

Which states have the most Bess power & energy capacity in 2022?

Of the 39 states with utility-scale BESSs in 2022, California, Texas, and Florida had the most installed BESS power and energy capacity. Their combined percentage shares were 83% of total BESS power capacity and 80% of total BESS energy capacity.