The Platinum certification covering Johnson Controls' 33-acre campus in Glendale, Wisc., represents the largest concentration of Platinum buildings in one location (a total of four). The project involved retrofits of two existing structures and the construction of two new ones. The grounds include 1,452 solar photovoltaic panels with an energy generation capacity of 250 kilowatts. A key to the certification was the installation of geothermal heat pumps that help reduce heating cost for this cold-weather campus by up to 29 percent. In the summer, they help reduce chiller operating costs by 23 percent. Skylights are widely used for natural daylight harvesting and a 30,000-gallon cistern rainwater capture system has helped reduce the use of potable water on the campus by 77 percent. (Photo courtesy of Johnson Controls)