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Aerial view of the project Linthal 2015 construction site at the Muttsee, pictured July 5, 2011 near Tierfehd in the Canton of Glarus, Switzerland. The power stations belonging to Linth-Limmern AG (KLL) in Glarus were built between 1957 and 1968. They use the water inflow from a catchment of around 140 km2 in the headwaters of the River Linth. With the demand for peak-load energy rising steadily, the KLLs are to be upgraded with an additional high-capacity pumped storage plant, Project Linthal 2015.(KEYSTONE/Alessandro Della Bella)