According to the U.S. Department of Energy, healthcare is one of the top five energy-consuming building categories and accounts for nine percent of energy use in commercial buildings. With utility bills making up an average of 1.4 percent of a hospital’s operating revenue, hospitals in the U.S spend about $8.3 billion total on energy costs each year. The impact of these energy costs on an individual hospital is huge. For example, a 200,000 square foot, 50-bed facility spends about $13,600 per bed on energy costs, equaling about $680,000 each year.