This text has been written to address the issues facing utilities, retailers, regulators, and customers in the changing electricity market. It is organized into five sections. Section I deals with the restructured organization that has emerged from yesterday's vertically integrated, regulated monopoly company. Section II deals with issues in competitive pricing and section III reviews the role of demand response and product design in today's chaotic marketplace. Given the single importance of California's energy crisis and the fact that it will be studied for years to come, section IV is devoted to studying the lessons learned from this crisis. The final section of the book deals with markets and regulations.