FILE PHOTO: E.ON headquarters in Essen, Germany, March 15, 2017. REUTERS/Thilo Schmuelgen/File Photo

FRANKFURT (Reuters) - German energy group E.ON said it had entered a strategic partnership with Nissan to explore business opportunities in the field of electric vehicle charging, storage solutions and vehicle-to-grid services.

The cooperation has already been started in Denmark and will be expanded to other European countries soon, E.ON said on Tuesday.