Sustaining the Army base ensures soldiers and their families have adequate resources to live and work. The focus of this paper is current and future energy demand for Army facilities and how demand will be met in the face of global resource shortages. Utility services for facilities on Army installations include: purchased electricity, steam, hot water and other utilities, and operation of electrical, heating, air conditioning, refrigeration, water distribution, and wastewater collection and treatment systems worldwide. In recent years, facility energy costs have escalated and demand has increased due to higher wartime operating tempo. This paper examines the impact this trend has on national security and the Army budget. This includes a survey of the Energy Policy Act of 2005 (EPACT 2005) and other defense relevant directives and an assessment of their impact on resulting Army energy strategy (e.g., Army Energy Strategy for Installations, Army Energy and Water Campaign Plan for Installations, etc.). This paper also addresses what the Army has accomplished to meet energy goals. Lastly, it considers the effect of energy efficiencies and employment of alternative sources of energy as well as the implications of failing to invest sufficient resources today to meet future energy demand.