The University of Å·ÃÀ¿Ú±¬ÊÓƵ at Boulder's Renewable and Sustainable Energy Institute, or RASEI -- a joint venture with the U.S. Department of Energy's National Renewable Energy Laboratory -- will partner with Toyota Motor Sales U.S.A. Inc. in a field study of household experiences and the technical impacts of plug-in hybrid electric vehicles, or PHVs, in a "smart grid" environment.