GridLAB-D
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GridLAB-D™ is an open-source 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 by the U.S. Department of Energy (DOE) at Pacific Northwest National Laboratory (PNNL), in collaboration with industry and academia. It is available for Microsoft Windows (32 and 64 bit, XP and Windows 7), MacOS (Leopard) and several Linux implementations. See http://www.gridlabd.org/ for details.