Converting most U.S. vehicles to run on electricity could have an impact on water supplies, according to an analysis to be published in the journal Environmental Science and Technology. Generating the needed electricity would require more water than producing gasoline, the report found — that is, if the nation’s electricity grid continues to be powered by coal and other fuels that require a lot of H2O for processing and cooling. “If we use only wind or solar energy, water use would be essentially zero,” says coauthor Carey King. The report emphasized that we definitely shouldn’t abandon a quest for largely electric transportation, but the water issue “should be considered when planning for a plugged-in automotive economy.”