As per the 15-year supply contract, RWE will provide Deutsche Bahn with electricity generated by RWE Innogy’s hydroelectric power plants in Germany.

RWE CEO Juergen Grossmann said RWE is generating electricity for Deutsche Bahn in the company’s own hydropower plants at the rivers Mosel, Saar, Rhine, Ruhr and Rur.

"We are supplying a long-standing, important customer with large volumes of electricity from renewables, which is proof that we are well positioned in this area," Grossmann said.

"By 2013 alone, we will have invested just under EUR4bn in expanding our capacity from renewables".

Overall, annual electricity supply to Deutsche Bahn is around 900GWh, enough to supply around 250,000 households with electricity annually or to run around one-third of the long distance train fleet for one year.

Through certified proofs of origin, RWE guarantees that their hydropower plants will feed the quantity of electricity into the grid required for the physical supply of electricity to Deutsche Bahn.