Fossil fuels have made up at least 80% of U.S. fuel mix since 1900

While the overall energy history of the United States is one of significant change, three fossil fuel sources—petroleum, natural gas, and coal—have made up at least 80% of total U.S. energy consumption for more than 100 years. Recent increases in the domestic production of petroleum liquids and natural gas have prompted shifts between the uses of fossil fuels, but the predominance of these three energy sources is likely to continue.