Providing sustainable energy is one of the fundamental challenges for mankind. With energy usage being a part of everyday activities and with the increasingly diversity of energy creation this is an inherently multi-disciplinary problem. Transportation and travel, heating and cooling, manu-facturing and production are major areas in which energy is used and all these domains become more and more linked to ubiquitous computing. With an increase in decentralized energy provision, ranging from energy harvesting in devices to personal green power plants, a great potential for creating sustainable energy arises, however at the cost of a higher complexity of the distribution network and storage mechanisms. Overall we believe that research in ubiquitous computing can provide important contributions for a world with sustainable energy. In this workshop we hope to get people from different disciplines together to share their visions and insights on how to conserve, efficiently produce, use, and distribute energy.