At the HEPP plant (High Efficiency Power-to-Methane Pilot), the IET Institute of Energy Technology is conducting research and development in the field of power-to-gas, power-to-X. In 2017, the power-to-gas team started this project with a lot of pioneering spirit. Today, almost four years after the first concept idea, the pioneering spirit is still present at our HEPP plant, only the pioneering romanticism has been partly caught up by everyday life.