1. Energy and Transportation Science Division, Oak Ridge National Laboratory, One Bethel Valley Road, Building 3147, P.O. Box 2008, M.S.—6070, Oak Ridge, TN 37831 e-mail:
2. College of Architecture and Design, The University of Tennessee, Knoxville, TN 37996 e-mail:
3. Skidmore, Owings & Merrill LLP, Chicago, IL 60604 e-mail:
4. Skidmore, Owings & Merrill LLP, Chicago, IL 60604;
5. Governor's Chair for Energy and Urbanism at the University of Tennessee, Knoxville, TN 37996 e-mail:
6. Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 e-mail:
7. Associate Laboratory Director at the National Renewable Energy Laboratory, Golden, CO 80401 e-mail: