In the early 1970s, Congress began mandating reductions in energy consumed by fed. agencies; primarily by improving building efficiency, and reducing fossil fuel use. Early legislation mandated a 10% reduction in fed. building energy and a recent Exec. Order mandates a 30% further reduction by 2015. This report reviews energy conservation legislation and Exec. Orders that apply to the DoD. Contents: Background; Energy Efficiency Legislation; Defense Energy Policies; Defense Energy Consumption and Spending; Renewable Electric Energy Purchases; Defense Energy Efficiency Improvements; Policy Considerations and Options for Congress. Charts and tables. This is a print on demand publication.