Germany, Oct. 26 -- RWE and Borussia Dortmund officially commissioned the new battery storage system at SIGNAL IDUNA PARK today during the Bundesliga home match against Eintracht Frankfurt. This marks the completion of the two partners' joint energy concept for the stadium. Following the installation of the photovoltaic system on the roof of the BVB FanWelt and the completion of the world's most powerful photovoltaic system on a stadium roof, the battery storage system has also become operational.The battery storage system has a capacity of 3.7 megawatts and can supply this output for just over an hour. The photovoltaic system, which was commissioned in December 2025, comprises 11,132 solar modules and has a capacity of more than 5 megawatt...