Coal Fired Plant in Florida (IMAGE) Duke University Caption Switching from coal to natural gas and renewables for electricity generation could save at least 12,000 billion gallons water a year by 2030, a Duke University study finds. Credit peakpx (creative commons 0) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.