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From its creation, the mission of Energie de l'Ouest-Suisse (EOS), founded in 1919 by the electricity companies of Western Switzerland as a limited company, was to exploit the hydropower of the region rationally and intensively.
Having become a holding company in 2002, EOS today is active in the fields of hydropower generation, high voltage and very high voltage transmission and the marketing of electricity,

on its own behalf and on behalf of its shareholders who are the main electricity companies in Western Switzerland.