Worldwide, the electric utility industry has been changing over the last several years as deregulation and privatization have been instituted. These changes in how the industry does business are summarized, and the evolving experience of the deregulation in 15 major countries is analyzed. In addition to the analysis, theoretical models and detailed case studies are provided to illustrate the changes. Utility regulatory agency personnel, utility management staff, and research professionals will all be interested in this work.