Solar Panels in the Desert TEP The Wilmot Energy Center, located on 1,130 acres southeast of Tucson International Airport, includes a 100-megawattsolar array and a 30-megawatt battery energy storage system – each the largest of their kind on TEP’s local energy grid. When paired with Oso Grande, the sites generate enough power for 135,000 homes. The university uses as much power as about 22,000 homes.