In May 2020, six partners from the gas industry and research signed the “Membrane separation natural gas-hydrogen Prenzlau” cooperation agreement. The project analyses how hydrogen can be separated from natural gas-hydrogen mixtures using different membranes in a pilot plant near Prenzlau. The local power-to-gas plant at ENERTRAG supplies green hydrogen generated from wind power. This is mixed with the natural gas in the ONTRAS network via the existing feed-in system with up to 20 percent by volume. In the pilot plant is tested which membranes are best suited for the recovery of hydrogen, which quantities can be separated from the gas stream and which degree of purity can be achieved.