21st Century U.S. Energy Sources: A Primer. Congressional Research Service, Library of Congress. Michael Ratner. May 19, 2017
Since the start of the 21st century, the U.S. energy system has seen tremendous changes. Technological advances in energy production have driven changes in energy consumption, and the United States has moved from being a growing net importer of most forms of energy to a declining importer—and possibly a net exporter in the near future. The United States remains the second largest consumer of energy in the world, behind China.
[PDF format, 40 pages, 1.17 MB].