U-M students in the Sustainable Energy Systems course (NRE 574/ESENG 599/PP 519) had two electrifying guests this past week, as a pair of 2011 Chevy Volts came to campus. The Volts, manufactured by General Motors, were used to demonstrate topics being discussed in the course taught by Greg Keoleian, the Peter M. Wege Professor of Sustainable Systems at SNRE and the director of its Center for Sustainable Systems (CSS). Students had a chance to sit inside the cars, look under the hoods at the battery system and learn more about the special monitoring equipment installed by GM to assess the car's performance. Nearly 40 GM engineers are also taking the course via distance learning.