Leading sources of electrical power generation in the United States as a percent of total kilowatt-hours generated. Renewable energy is further illustrated in the second graph.
Between 1990 and 2014 conventional hydroelectric power, not shown on this graph, was the leading source of renewable energy. From a high of 10.2% (in 1997) to a low of 5.8% (in 2001) conventional hydroelectric power produced 6.3% of electricity in the United States in 2014. Contributions from other renewables are illustrated below.