Solar Installation A construction crew installs a solar array at Hill Air Force Base, Utah, Jan. 9, 2018. The new system is being installed through an Energy Savings Performance Contract that costs the government no money up front. During the 23-year arrangement, Energy Solutions Group will operate and maintain the system. SHARE IMAGE: Download Image: Full Size (1.36 MB) Photo By: Ronald Bradshaw, Air Force VIRIN: 190109-F-OD616-0004A.JPG Photo Gallery