Energy Secretary Jennifer Granholm has issued a challenge to U.S. mayors, calling for 125 local governments to adopt the SolarAPP+ tool in their communities in 2021.

SolarAPP+ is a web-based platform developed by the National Renewable Energy Laboratory that expedites the solar permitting process. The U.S. Department of Energy officially launched SolarAPP+ in July. The tool makes it easier for local governments to issue permits for rooftop solar, saving consumers, local governments, and installers time and money.