Recent events highlight the importance of energy generation and distribution of power in today's society. It is clear that while additional large-scale power generation will have to address long-term societal issues such as safety and environmental impact, enhancing the efficiency of our day-to-day devices (transport, heating/refrigeration, home electronics, etc.) requires mainly the development of new materials with improved properties. This MRS volume, first published in 2002, focuses on materials issues in the low-scale generation, storage and transport of energy-photovoltaics, batteries,...