The technology generates energy by passing water through a turbine as it moves from a higher reservoir to a lower one. It accounts for most utility-scale energy storage in the U.S., but hasn’t been used much in Indiana — which has fewer of the hills and valleys needed to create the two reservoirs.

Senate Bill 147 would add underground pumped storage hydropower to Indiana’s list of clean energy resources. It passed the state House on Monday.

2021 was a record-breaking year for investment in and deployment of clean energy, battery storage, and EVs in the US, according to the “2022 Sustainable Energy in America Factbook” published today by BloombergNEF (BNEF) and the Business Council for Sustainable Energy (BCSE).