How many MWh is a residential energy storage system?

The data set totals 263 MWh, and covers all or a portion of installations in 20 states and the District of Columbia. WoodMac estimated that U.S. residential energy storage installations were 540 MWh in 2020, though an exact share of the market is not calculated here due to differences in the data such as when systems are considered installed.

Are ESS battery imports based on residential & nonresidential installations?

These data are based on companies supplying systems for residential installations, though they also include some batteries for nonresidential installations as some companies supply both market segments. The data are only for battery imports that could be specifically identified as being used in domestic ESS assembly.

How many companies sell ESSs in the United States?

The data are for 24 companies that sell ESSs in the United States. These data are based on companies supplying systems for residential installations, though they also include some ESSs for nonresidential installations as some companies supply both market segments.

Why did US residential ESS imports increase in 2020?

There were several new entrants with foreign production to the residential market in 2019–20, however, some of which have a number of competitive advantages that enabled them to quickly gain U.S. sales in the second half of 2020. As a result, U.S. residential ESS imports rapidly increased in 2020.

How did ESS imports perform in the first quarter of 2021?

Complete ESS imports increased by more than 400 percent from the first quarter of 2019 to the fourth quarter of 2020 (figure 9). Imports then declined in the first quarter of 2021, though imports were up almost 200 percent compared with the first quarter of 2020.

Where does ESS come from?

As a result, U.S. residential ESS imports rapidly increased in 2020. South Korea was historically the largest foreign residential ESS supplier, but an increasing share of imports are shipped from China and Vietnam.