From Section 1, Policy: "The Congress has enacted a wide range of statutory requirements related to energy and environmental performance of executive departments and agencies (agencies), including with respect to facilities, vehicles, and overall operations. It is the policy of the United States that agencies shall meet such statutory requirements in a manner that increases efficiency, optimizes performance, eliminates unnecessary use of resources, and protects the environment. In implementing this policy, each agency shall prioritize actions that reduce waste, cut costs, enhance the resilience of Federal infrastructure and operations, and enable more effective accomplishment of its mission."
Executive Order 13834, EO 13834
Federal Register: http://www.gpoaccess.gov/fr/
Federal Register (May 22, 2018), v. 83, no. 99, p. 23771-23774