The Reiner Lemoine Institute is an independent non-profit research institution that contributes to a transformation towards a sustainable energy supply based on 100 % renewable energy. For more than ten years we have conducted applied research to scientifically support the long-term transition of the energy supply system towards renewable energy. Open source models developed here have firmly established themselves in energy system modeling. Our mobility and electrification concepts have been implemented by private companies as well as the public sector worldwide. In our Off-Grid Systems research unit we develop electrification strategies based on renewable energy for developing regions and optimize hybrid mini-grids with the help of simulation models and geographic information software.