After the merger of VEBA, the parent company of PreussenElektra, and VIAG, the owner of Bayernwerk, in 2000, PreussenElektra merged with Bayernwerk to form E.ON Energie, a subsidiary of E.ON.
In 2000, after VEBA and VIAG merged, forming the parent company of PreussenElektra and Bayernwerk respectively, PreussenElektra then combined with Bayernwerk to create E.ON Energie, a division of E.ON.