Deutsche Bahn (DB) have renewed their commitment to green energy across the network by signing a Power Purchase Agreement, with the Nordsee Ost wind farm, for the next five years.

100% Green by 2038

Already the largest consumer of green-power in Germany, DB has set itself the goal of powering the entire rail network with renewable energy by 2038. The company already covers 57% of its requirements from renewables.
source= https://railway-news.com/more-green-energy-for-deutsche-bahn/