Grey, blue and green. The colors of hydrogen depend on the way in which it is produced and the one getting the most attention today is, of course, green, as it is the one with the lowest carbon emissions. Currently, the hydrogen market is still in a pilot phase and there is still no infrastructure ready for its distribution, but the potential is high. Kurt Koenig talks to us about the virtuous project of the Aberdeen Event Complex in Scotland, where hydrogen is integrated with other technologies, including cogeneration from biogas.