When a law is passed, it is first published as a Session Law. Eventually it is reworked into a subject arrangement of the law which is called a code. Most researchers will make use of an annotated version of the code which often cites to case law, secondary sources, other relevant statutes and regulations that will help you with your research.
U.S. energy laws are codified in several titles of the United States Code including Titles 7, 10, 12, 15, 16, 19, 26, 31, 42, 43 & 50. Sources include:
Regulations pertaining to energy law are scattered in various titles of the Code of Federal Regulations. They relate to oil, gas, wind, solar, nuclear, electricity, water and public utilities. Sources of federal regulations include: