Germany’s Siemens Energy AG (<a href="https://www.boerse-frankfurt.de/equity/siemens-energy-ag" target="_blank">ETR:ENR</a>) and France-based industrial gas supplier Air Liquide (<a href="https://live.euronext.com/en/product/equities/FR0000120073-XPAR" target="_blank">EPA:AI</a>) have officially opened their gigawatt-scale electrolyser factory in Berlin, preparing a ramp-up in production to 3 GW annually by 2025.