... Sidney Diamond, Office of Heavy Vehicle Technologies, to William Brown, member of the Committee on Review of DOE’s Office of Heavy Vehicle Technologies, June 13, 2000 DOE (U.S Department of Energy) ... Summary The U.S Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy oversees the Office of Transportation Technologies, which includes the Office of Heavy Vehicle Technologies ... Energy oversees the Office of Transportation Technologies, which includes OHVT, the Office of Advanced Automotive Technologies (OAAT), the Office of Fuels Development, and the Office of Technology...