The U.S. Department of Defense has an annual energy budget of approximately $20 billion, which accounts for nearly 80 percent of the federal government’s total energy consumption. U.S. military bases alone rack up a $4 billion energy bill annually. One of the most innovative and groundbreaking projects at Grissom was the recent installation of a $100,000 geothermal heating and cooling system. It’s the first unit of its kind ever installed on an Air Force Reserve Command base. Other energy-saving upgrades include the installation of low-flow plumbing, better HVAC controls, energy efficient lighting, and infrared heating systems. Grissom spent more than $900,000 last year on those projects.