(FILES) In this file photo an aerial image shows vehicles driving on the California 14 Highway as solar panels, part of an electricity generation plant, stand on June 18, 2021 in Kern County near Mojave, California. - Solar power could account for nearly half of the United States' electricity supply by the middle of the century, according to a government study released on September 8, 2021. The report, released by the Department of Energy, said solar could account for much as 40 percent of the power supply by 2035 and 45 percent by 2050, up from its current level of just three percent. (Photo by Patrick T. FALLON / AFP)