UL Announces Plans to Collaborate with NREL Towards Commercialization of SolarAPP+ Automated Permitting Tool New tool helps local governments expedite permitting on residential solar projects while determining compliance with safety and code standards News provided by Share this article Share this article NORTHBROOK, Ill., May 4, 2021 /PRNewswire/ -- UL, the global safety science leader, and the National Renewable Energy Laboratory (NREL) today announced a new initial memorandum of understanding (MOU) to work towards further developing and commercializing the Solar Automated Permit Processing Plus (SolarAPP+) software that will automate the permitting process for residential solar systems. The use of SolarAPP+ enables local governments to cut down on the time required to grant a permit from a national average of five business days to zero.