Abstract: This report contains five substantive sections describing plug-in hybrid electric vehicle (PHEV) related research conducted over an 18-month period by faculty and graduate students at the University of Vermont. Funding for these separate but related projects was provided by the Transportation Research Center, electric utilities, and Vermont State Agency partners. Section 1.2 of this report presents a literature review of prior studies regarding the proportion of miles driven under gasoline and electric power respectively, the resulting gasoline displacement and net change in greenhouse gas (GHG) emissions associated with PHEV operation, the generating capacity available to charge PHEVs and vehicle lifetime ownership costs. Section 2 is an analysis of state and federal policies to enhance the economic competitiveness of PHEVs. Two models of the impact of electricity demand for PHEV charging are described in Sections 3 and 4. The first of these models looks at the impact of this additional electricity demand on carbon allowance prices and generating costs under an electricity sector only cap-and-trade program, while the second explores its impact on medium voltage distribution circuits. Section 5 estimates the economic potential for bidirectional interfacing between vehicles and the grid, a concept known as vehicle-to-grid or V2G, in Vermont.