The Linth–Limmern Power Stations are a system of
hydroelectric
Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...
power stations located south of
Linthal in the
canton of Glarus
The canton of Glarus ( ; ; ; ) is a cantons of Switzerland, canton in east-central Switzerland. The capital is Glarus.
The population speaks a variety of Alemannic German.
The majority of the population (81%) identifies as Christianity in Switzer ...
,
Switzerland
Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. 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
Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing.
A PSH system stores energy in the form of gravitational potent ...
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.
Design and operation

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. A 2.2 MW
solar farm was added to the Muttsee dam in 2021, supplying 3.3 GWh per year.
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 middle 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
The Pelton wheel or Pelton Turbine is an impulse-type water turbine invented by American inventor Lester Allan Pelton in the 1870s. The Pelton wheel extracts energy from the impulse of moving water, as opposed to water's dead weight like the t ...
, 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. These four reversible pump-turbines are of
slip energy recovery variable-speed type. During periods of low demand, water can be pumped from Lake Limmern to Lake Mutt and when energy demand is high, the water is released down for generation. The same turbines that pump the water to Lake Mutt reverse into generator mode. The difference in elevation between the two lakes affords a net
hydraulic head
Hydraulic head or piezometric head is a measurement related to liquid pressure (normalized by specific weight) and the liquid elevation above a vertical datum., 410 pages. See pp. 43–44., 650 pages. See p. 22, eq.3.2a.
It is usually meas ...
of .
Lake Limmern also provides water to the Tierfehd Power Station further down in the valley for conventional hydroelectric generation and pumped-storage. This power station includes three 87 MW Pelton turbines, in service since 1964, and one 140 MW Francis reversible pump-turbine, that was added to the complex in 2009. Additionally, the Hintersand Balancing Reservoir provides water to two 20 MW Pelton turbines also within the Tierfehd Power Station. Also in this Power Station, a 34 MW
electrically driven pump allows the transfer of water from Hintersand Reservoir up to Lake Limmern.
Water used for power generation at Tierfehd is discharged into the Tierfehd Balancing Reservoir. The water in this reservoir can either be pumped back up to Lake Limmern or directed down to the Linthal Power Station, which has two 17.2 MW Pelton turbines. From there, the Linthal Power Station discharges the water into the Linthal Balancing Reservoir and into the Linth river.
Standseilbahn Linth-Limmern is a funicular from Tierfehd to the Limmern Power Station.
See also
*
List of pumped-storage hydroelectric power stations
The following page lists all pumped-storage hydroelectric power stations that are larger than in installed generating capacity, which are currently operational or under construction. Those power stations that are smaller than , and those that are ...
*
List of tallest dams in Switzerland
*
List of power stations in Switzerland
Notes and references
External links
Linth-Limmernat Axpo AG
Drone video
{{DEFAULTSORT:Linth-Limmern Power Stations
Dams completed in 1963
Energy infrastructure completed in 1968
Dams in Switzerland
Arch dams
Hydroelectric power stations in Switzerland
Pumped-storage hydroelectric power stations in Switzerland
20th-century architecture in Switzerland