Constrained budgets and increasing energy efficiency goals have led federal agencies to explore innovative ways to fund energy improvements, including the Department of Energy's Energy Savings Performance Contracts (ESPC). An expected increase in the use of ESPCs has raised questions about agencies' ability to ensure that the government's interests are protected. ESPCs can span up to 25 years and be valued at millions of dollars each. This book examines the extent to which agencies have used ESPCs and plan to use them; projects have achieved their expected cost and energy savings; and agencies have overseen and evaluated such projects.