The Energy and Environment Track at the 9th International Conference on Business Informatics (WI-2009) focuses on two major influences increasingly changing energy markets and their value chains: Liberalization, which is particularly driven by European regulation ("legal unbundling"), and decentralized, regenerative power generation in order to meet the political aims regarding climate change. These changes affect market participants and their IT infrastructure. There is a need for understanding the complex environmental cause-effect relationships to anticipate future developments and recommend further actions for both the political and economic sectors.