This is a modern text and reference book on energy economics. It assumes as background only the microeconomic portion of the introductory or first course in economics, and the mathematical requirements can, for the most part, be met by secondary school algebra. The subjects taken up in some detail are: oil, gas, coal, electricity, and energy derivatives - i.e. futures, options, and swaps. The long chapter on derivatives is applicable to all commodities, and can serve as an easily read background to financial derivatives. Other topics that are treated include uranium and capital budgeting, and to a lesser extent real option theory and deregulation. There are many simple exercises that are intended to build confidence, and an extensive glossary that both students and energy professionals should find useful.