Hydropower - More than megawatts (IMAGE) DOE/Oak Ridge National Laboratory Caption The latest data show hydropower represents 6.6% of all electricity generated and 38% of electricity from renewables produced in the United States. Pictured is the Red Rock Hydroelectric Project in Marion County, Iowa. Credit Missouri River Energy Services 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.