Speaking to journalists following the publication of first-quarter results, Spieker said that the stake E.ON will get from RWE will already enable it to implement a so-called domination and profit and loss transfer agreement.

E.ON and RWE in March announced plans to break up Innogy and divide its parts among them in a major overhaul of Germany's corporate energy sector.

(Reporting by Christoph Steitz; Editing by Maria Sheahan)