 US DOE has supported GridLAB-D through both direct funding and funding of projects that support enhancements to the simulation's capabilities.In 2017 the CEC awarded several grants to enhance GridLAB-D with the aim to support use in California regions operated by the investor-owned utility ratepayers.The enhancements focus on the California Public Utilities Commission's (CPUC) proceedings related to distributed and renewable energy resource integration, with particular attention to usability, scalability and interoperability.