In the German news (sorry): Stuttgart: "Power-to-Gas" als Energiespeicher der Zukunft? - Nachrichten :: Baden-Württemberg | SWR.de press release (German, too - they don't have translated it :frown ZSW: Weltweit größte Power-to-Gas-Anlage zur Methan-Erzeugung geht in Betrieb The news article mentions that an even larger plant of 6MW is already in planning. Location is Werlte, Lower Saxony. Audi wants to start operation of this plant next year, together with the researchers from Stuttgart. Disclaimer: I searched for an appropriate thread. Loosely related findings were Consumers storing Grid Power Zero-Carbon ICE fuel - Page 2