With Federal Energy Regulatory Commission approval, announced July 24, the Sacramento Municipal Utility District may now embark on its 400 MW Iowa Hill Pumped Storage project. Pumped-storage hydroelectricity is used for electricity storage and load balancing. So far, the muni only has been working on the underlying geology of the proposed facility, according to the utility. Sacramento plans to conduct geotechnical investigations in October. Under the pumped-storage concept, when electricity demand is high, water would be released from an upper reservoir and gravity would pull the water down to an underground cavern to create power to cool homes and businesses on summer afternoons. During the night, when generation at the muni\u2019s wind farms is high and electricity demand is low, the underground turbines would run in reverse and pump water from the lower reservoir back up to the top of Iowa Hill. The cycle could be repeated using the same water over and over again, and Iowa Hill could potentially help manage renewable energy provided by both the wind and sun. If completed, the storage reservoirs \u201cwould add a significant level of operating flexibility that would help [the utility] balance supply and demand on the grid,\u201d according to the muni. \u201cAs directed in the new license, [the utility] will continue to evaluate the feasibility of building the development over the next three years.\u201d Then, it\u2019s up to the board of directors whether to go forward, noted the muni.