The United States energy market is about 29,000 terawatt hours per year. Energy consumption per capita is 7.8 tons (7076 kg) of oil equivalent per year, the 10th-highest rate in the world. In 2005, 40% of this energy came from petroleum, 23% from coal, and 22% from natural gas. The remainder was supplied by nuclear power and renewable energy sources. The United States is the world’s largest consumer of petroleum. The United States has 27% of global coal reserves. It is the world’s largest producer of natural gas and crude oil.

For decades, nuclear power has played a limited role relative to many other developed countries, in part because of public perception following the Three Mile Island accident in 1979. In 2007, several applications for new nuclear plants were filed.

Since 2007, the total greenhouse gas emissions by the United States are the second highest by country, exceeded only by China. The United States has historically been the world’s largest producer of greenhouse gases and greenhouse gas emissions per capita remain high.