Stock Photo - 19 September 2022, Baden-Wuerttemberg, Unteruhldingen: The inscription ""Solar energy on board!"" can be read on a window pane of an e-ferry. The ship, named after the island of Mainau, is intended to take up to 300 people on each of its trips to the flower island and to the northern shore of the lake. For this purpose, the ferry, which cost 3.6 million euros, has a 1,000-kilowatt-hour battery that is charged during the lunch break and at night. To save energy, the ship travels at 15 kilometers per hour in the water. Photo: Silas Stein/dpa. - Unteruhldingen/Baden-Wuerttemberg/Germany

Stock Photo: 19 September 2022, Baden-Wuerttemberg, Unteruhldingen: The inscription ""Solar energy on board!"" can be read on a window pane of an e-ferry.

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