The Fraunhofer Institute for Systems and Innovation Research is part of the Fraunhofer Society for Applied Research in Germany, a non-profit corporation, which promotes applied research and assures the link between fundamental and industrial research. The Fraunhofer Society is mostly financed through contract work for public bodies at European, national and regional level as well as for industrial companies. The research society has 56 research institutes all over Germany. The Fraunhofer ISI complements the scientific and technological spectrum of the Fraunhofer Institutes through interdisciplinary research on the interdependence between technology, economy and society. The main fields of research of the Department Energy Technology and Energy Policy are energy efficiency, renewable energy sources, energy economics analyses and energy and climate policy. Studies on energy efficiency include technical and economic potentials of rational energy use and renewable energy sources as well as techniques for removing or storing CO2 and models of the energy system as well as derived developments in investment and emission costs. Energy economics analyses cover market analyses for energy technology products and energy services, sector analyses, estimates of energy demand and energy demand scenarios, the influence of energy market liberalisation on the exploitation of energy efficiency potentials, renewables and corporate strategies, the impacts of rational energy use and renewable energy sources on employment, income, economic structure and environment as well as development, survey, interpretation and evaluation of energy efficiency indicators at a regional, national and international level.