The Fourth Edition of Energy, Economics and the Environment focuses on the unifying characteristics of energy law, while also emphasizing its connections to environmental and economic issues affecting energy industries. The casebook covers the full range of energy resources, as well as an in-depth examination of issues related to electric power. Like previous editions, this casebook is intended to be used in an Energy Law survey course, but the materials in the book are rich enough that they can also be adapted to a course or seminar covering renewable energy, oil & gas, electricity regulation, or advanced topics in environmental law. Previous editions of the casebook have been used in law school classrooms for nearly two decades. The new edition of the casebook provides a pedagogical window that can readily be adapted to a variety of courses and teaching styles as issues in energy continue to change. Materials in the casebook include extended problems, case studies, and other practice-oriented materials to allow students to learn important concepts in a practical context. We emphasize four recurring and cross-cutting themes throughout the casebook: (1) public versus private ownership of energy resources; (2) monopoly vs. competition; (3) externalities and risk concepts; and (4) public governance, including federalism issues. These four themes have defined energy law since the area developed in the early twentieth century and they play out in every energy resource arena today.