As the nation’s largest purchaser of electricity, the federal government is attempting to lead the way toward renewable energy. This report evaluates the challenges and opportunities facing government energy managers and contracting officers as they move toward purchasing renewable energy and green power in recently deregulated markets, and it identifies ten key elements of successful energy procurement. The report also addresses concerns over minimizing costs and determining best value as well as complying with federal directives. A series of case studies highlight useful strategies and potential pitfalls of renewable-energy procurement for federal agencies. The report also includes detailed information on the procurement programs run by the General Services Administration and the Defense Energy Support Center.