Linth–Limmern Power Stations  The Linth–Limmern Power Stations are a system of hydroelectric power stations located south of Linthal in the canton of Glarus, Switzerland. The system uses five reservoirs and four power stations at steep variations in altitude. Works on the complex began in 1957 with the construction of Lake Limmern Dam and the Mutt, Tierfehd and Linthal Power Stations. The dam was complete in 1963 and the power stations were all operational by 1968, with an installed capacity of 340 MW. In 2009, a 140 MW pumped-storage component between Lake Limmern and Tierfehd Reservoir was commissioned. In 2010, construction began on the Linthal 2015 Project, which included the expansion of Lake Mutt and Tierfehd Reservoir, and the addition of the Limmern Power Station, a 1,000 MW pumped-storage component between Lake Mutt and Lake Limmern. Commissioning of the last unit in Limmern was completed by December 2017, bringing the total installed capacity of the system to 1480 MW. The highest reservoir in the complex is Lake Mutt ("Muttsee"), situated at above sea level. It had an original storage capacity of , and was later expanded to during the Linthal 2015 expansion, to hold extra capacity for the new pumped-storage power station. Below Lake Mutt, the main reservoir in the complex is Lake Limmern ("Limmernsee"), which was created by a tall and long arch dam on the Limmern Creek. At an elevation of above sea level, it can store up to of water. At an elevation of above sea level in an adjacent valley, the "Hintersand Balancing Reservoir" has a storage capacity of . The central reservoir in the complex is the "Tierfehd Balancing Reservoir", located at an altitude of above sea level. It was built in 1964 with an original storage capacity of , but was later expanded to during the Linthal 2015 expansion project. Finally, the "Linthal Balancing Reservoir" is located down in the valley at an elevation of above sea level, and withholds of water. It has a direct discharge into the Linth river. Between Lake Mutt and Lake Limmern are the Mutt Power Station, in service since 1965 containing a single 4.4 MW Pelton turbine, and the latest expansion to the complex, the Limmern Power Station, which completed commissioning in late 2017 and has four 250 MW Francis pump-turbine.