The Gas- und Wärme-Institut Essen e.V. (Gas and Heat Institute, short GWI) is a non-profit and independent research institute that has been involved in addressing the energy topics of the future together with its members, partners and customers for many decades. In the course of the energy transition, GWI has developed into an Energy Institute that is open to all types of technology and is engaged in numerous research projects at state, federal and EU level as well as application-oriented cooperation with industry. Due to the close interaction between the departments of Research and Development, Training and Consulting Center, Testing Laboratory and L-H Gas Market Conversion, GWI has created extensive possibilities to support the transformation of the energy system on all levels of the technology chain including production, supply and end-use.