The Gressoney hydroelectric power plant is a reservoir plant capable of producing hydroelectric power and is located in the municipality of Gressoney-La-Trinité, at the beginning of the Lys stream valley, a name derived from the high peaks of the Monte Rosa massif: Western Lyskamm (4,481 m asl) and Eastern Lyskamm (4,527 m asl), which feed it.

The valley is home to the Walser community of Germanic origin, which settled in the 12th-13th centuries in the Italian, Swiss and Austrian Alps and still speaks Titsch, a dialect of German origin. The Gressoney plant was built at the same time as the Gabiet dam in 1921. Upgraded in 2012, it has always ensured the security of continuity of power supply to utilities, even in the event of a power grid blackout. Construction work to replace the penstock (built in 1918) with a new one that was installed on an alternative route to the existing one began in late 2014. The work was completed in 2017

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