Germany’s state-controlled firm Securing Energy for Europe (Sefe) plans to invest around $540 million (500 million euros) in repurposing some of its underground gas storage sites and gas pipelines into infrastructure fit for storing and transporting green hydrogen, Sefe’s CEO Egbert Laege told Reuters in an interview published on Wednesday. “The exact investment calculation is not yet available, but we are talking about sums in the mid-three-digit million-euro range for converting some of our gas storage sites…