The Chavonne run-of-river hydroelectric power plant went into operation in 1922. Contrary to what one would expect, it is not located close to the riverbed, but halfway up the river in order to discharge the water passing through the turbine into the Grand Eyvia power plant‘s bypass channel, serving the Grand Eyvia plant and the Aymavilles plant. The Chavonne plant derives water from the Grand Eyvia, to which is added the Nomenon and later, through a long tunnel, water of the Savara side valley. The Chavonne plant produces renewable hydropower and is able to deliver 7 m3 every second to the 5 installed Pelton turbines, which together reach a total capacity of 27 MW.

The power plants of Chavonne, Champagne 1, Champagne 2, Grand Eyvia and Aymavilles, hydraulically interconnected, until the 1990s supplied - through their own 50 kV power grid, later decommissioned - the “Cogne” plants in Aosta, under the same ownership.

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