The CCER focuses on computational challenges critical to the exploration, identification and early screening of scalable energy conversion and energy storage technologies. It is our goal to provide a computational foundation for a smooth and successful transition towards a sustainable global energy system. The challenge common to almost all such computational energy research is to describe and model a variety of physical phenomena at a range of length and time scales. In order to create an environment that is most likely to evoke breakthroughs, the research program of the CCER is organized according to the length and time scales at which subjects are modeled.