Altendorf is a municipality in March District in the canton of Schwyz in Switzerland. Altendorf is first mentioned in 972 as Rahprehteswilare. …Altendorf is a municipality in March District in the canton of Schwyz in Switzerland. Altendorf is first mentioned in 972 as Rahprehteswilare. In 1932, construction started on the Etzelwerk, a hydro-electric power station to generate power for the Swiss Federal Railways. By 1937, the power station was complete and in operation. The plant continues in use today, and takes its water supply from the Sihlsee reservoir that lies 5 kilometres to the south-west.
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