Energy group RWE AG (<a href="https://www.boerse-frankfurt.de/equity/rwe-ag-st" target="_blank">ETR:RWE</a>) has agreed to renew and expand the photovoltaic (PV) system on the roof of Borussia Dortmund’s stadium, with the project resulting in the largest solar installation on a stadium roof in Germany with a total capacity to over 4.2 MWp.