U.S. Energy in the 21st Century: A Primer. Congressional Research Service. Melissa N. Diaz et al. March 16, 2021.
Since the start of the 21st century, the U.S. energy system has changed tremendously. Technological advances in energy production have driven changes in energy consumption, and the United States has moved from being a net importer of most forms of energy to a declining importer—and a net exporter in 2019. The United States remains the second largest producer and consumer of energy in the world, behind China.
[PDF format, 53 pages].