The University of San Diego (USD) and Point Loma Nazarene University (PLNU) are licensing the sun. Both California schools are generating solar power on campus without having to sink large amounts of capital into equipment and installation. By negotiating power purchasing agreements (PPAs) with Amsolar and Perpetual Energy Systems, respectively, the schools buy the solar energy generated on campus through equipment owned and maintained by these companies. Typically negotiated for terms of 20 to 25 years, PPAs are making renewable solar energy a feasible option for budget strapped colleges and universities. "Campus Technology" recently spoke with Alexandria Bennett, PLNU's sustainability coordinator, and Michael Catanzaro, USD's director of sustainability, about the key benefits of PPAs and the critical factors to consider before signing an agreement.