Large events, such as festivals, consume more electricity than the main grid can supply. As a result, festivals rely on generators that consume up to 130,000 liters of diesel per event. With more than 12,000 large outdoor events in Western Europe each year, it is essential to find ways to reduce this waste and pollution. The GEM tower has been developed to change this. This tall tower is a large battery that controls the storage and distribution of renewable wind and solar energy. In this project, GEM-stage wants to complete the supply of renewable sources in the GEM-stage by adding hydrogen.