German carmaker Opel plans to celebrate the 125th anniversary of its plant at Rüsselsheim in western Germany on Saturday. The occasion is to be celebrated with an open day, with some high-profile guests in attendance, including German Chancellor Olaf Scholz. Visitors will be able to gain an impression of how the manufacturer is helping to shape the transition to electromobility, the company said. In 1899, the then sewing machine and bicycle manufacturer built its first car, the Patentmotorwagen System Lutzmann. Opel had previously taken over the works of pioneer Friedrich Lutzmann and relocate…