Energy production and energy use is one of the critical issues that must be solved for a sustainable future. It is also one of the keys for adaptation and mitigation of climate change. This workshop will focus on energy mostly in the local context and how to achieve a transition to a fossil fuel free energy system. We will review the entire spectrum of energy sources and look at how to improve energy efficiency. The workshop will rely on expertise from Uppsala University, one of the European Centres for Research on renewable energy systems, from Uppsala municipality and county, and the BUP network.