This annual workshop is organized by the Energy Efficient HPC Working Group. It provides a strong blended focus that includes both the facilities and system perspectives; from architecture through design and implementation. The sessions will cover all of the currently active activities of the EE HPC WG. It will also feature special talks on both Sunday and Monday. Dan Reed, currently from the University of Iowa and Chris Malone, Google, will talk about HPC and data warehouse-sized computers. On Monday, Jack Dongarra, University of Tennessee and Steve Poole, ORNL will describe proposed new benchmarks and their implications for power, energy and efficiency. Also on Monday, John Shalf, LBNL, will present a survey of system architecture trends and energy efficiency.