Here are some important sources for energy and environment law research.
Title 7 - AGRICULTURE
Title 16 - CONSERVATION
Title 30 - MINERAL LANDS AND MINING
Title 33 - NAVIGATION AND NAVIGABLE WATERS
Title 40 - PUBLIC BUILDINGS, PROPERTY, AND WORKS
Title 43 - PUBLIC LANDS
CFR Title 10 - Energy
National Association of Regulatory Utility Commissioners
Companies involved in oil, natural gas, petroleum, energy, oil services, drilling, natural resources, wind power and solar.
Renewable Energy Directory