Silver Spring Networks helps utility companies plug into the 21st century. Its Smart Energy Platform modernizes a utility's existing power grid infrastructure into the "smart" grid, i.e. one that is connected to a digital network and more energy efficient. The Smart Energy Platform is a secure, Internet-based network made up of hardware, such as access points, communications modules, bridges, and relays; its UtilOS-brand network operating system; and software. It also offers managed services to maintain and regulate the network. Silver Spring sells its platform to electric, gas, and water utilities -- FPL, PG&E, and OG&E account for almost 80% of service revenue. The company went public in 2013.