What is "gridlab-d"

GridLAB-D is an open-source ( BSD license) simulation and analysis tool that models emerging smart grid energy technologies. It couples power flow calculations with distribution automation models, building energy use and appliance demand models, and market models. It is used primarily to estimate the benefits and impacts of smart grid technology.

GridLAB-D was developed under funding from the United States Department of Energy (DOE) Office of Electricity (OE) at Pacific Northwest National Laboratory (PNNL), in collaboration with industry and academia. It is available for Microsoft Windows, Mac OS and several Linux implementations.