So far, H2 has comprised only a tiny slice of the German gas grid. And the suitability of increasing this share to up to 30 percent is currently only being tested within the framework of individual, time-limited demonstration projects. H2 “micronets,” that is city districts or regions running 100 percent on hydrogen, are yet to exist. But Lennart Lohaus has recently demonstrated that H2-based solutions can already be economically attractive today. As part of his master thesis, he developed an optimization model for designing regenerative supply solutions with hydrogen as energy carrier for the coal district Rheinisches Revier.