|Location||Grimsel, Bernese Oberland|
|Catchment area||16.0 km2 (6.2 sq mi)|
|Surface area||0.645 km2 (0.249 sq mi)|
|Max. depth||48 m (157 ft)|
|Water volume||13 million cubic metres (11,000 acre⋅ft)|
|Surface elevation||1,850 m (6,070 ft)|
Gelmersee (or Lake Gelmer) is a reservoir in Bernese Oberland, Switzerland. The hydroelectric reservoir was completed in 1932, at about the same time as the Grimselsee reservoir, and both are operated by Kraftwerke Oberhasli. The reservoir's volume is 13 million m³ and its surface area 64.5 ha (159 acres).
The reservoir may be reached by the Gelmerbahn from Handegg, Guttannen at 1,412 m. The funicular's track with a length of 1,028 m has a maximum inclination of 106%.
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The Grande Dixence Dam is a concrete gravity dam on the Dixence at the head of the Val d'Hérémence in the canton of Valais in Switzerland. At 285 m (935 ft) high, it is the tallest gravity dam in the world, fifth tallest dam overall, and the tallest dam in Europe. It is part of the Cleuson-Dixence Complex. With the primary purpose of hydroelectric power generation, the dam fuels four power stations, totaling the installed capacity to 2,069 MW, generating approximately 2,000 GWh annually, enough to power 400,000 Swiss households.
Lake of Gruyère is an artificial lake in the La Gruyère region of the Canton of Fribourg, Switzerland.
The Grimselsee or Lake Grimsel is an artificial lake near the Grimsel Pass in the Canton of Berne, Switzerland. With a volume of 95 mio m³, it is larger than other hydroelectric reservoirs in the region: Oberaarsee, Räterichsbodensee and Gelmersee. The dam was completed in 1932 and is operated by Kraftwerke Oberhasli AG (KWO). It is located in the municipality of Guttannen.
Zervreilasee is a reservoir located south-west of Vals in the canton of Graubünden, Switzerland. The lake has a surface area of 1.61 km² and an elevation of 1,862 m. The maximum depth is 140 m.
Lac d'Émosson is a reservoir in the canton of Valais, Switzerland. It is located in the municipalities of Salvan and Finhaut. The closest small city in Switzerland is Martigny. The lake has a surface area of 3.27 km² and an elevation of 1,930 m. The maximum depth is 161 m. The purpose of the Émosson Dam is hydroelectric power generation. Water from the reservoir first powers the 189 MW Vallorcine Power Station downstream and just over the border in Vallorcine, France. Water is then sent through a headrace tunnel to the 162 MW La Bâtiaz Power Station, 12 km (7 mi) to the east in Martigny, Switzerland. The drop between the dam and La Bâtiaz Power Station is 1,400 m (4,593 ft).
Lac de Moiry is a reservoir in the municipality of Grimentz, Switzerland. The lake has a surface area of 1.40 km² and an elevation of 2,249 m. The maximum depth is 120 m.
Lago Ritom is a lake in the Piora valley, Ticino, Switzerland. The natural lake is used as a reservoir by the Swiss Federal Railways (SBB-CFF-FFS) to generate hydro-electric power for the Gotthard line. The first dam was built in 1918 and, in 1950, its height was increased by 23 m.
Limmernsee is a reservoir in the Canton of Glarus, Switzerland, between the peaks of Muttenchopf, Selbsanft and Kistenstöckli. It may be reached by aerial tramway or by foot from Linthal.
Lac de Mauvoisin is a reservoir in the canton of Valais, Switzerland. The reservoir is formed by the Mauvoisin Dam, which is 250 m high. The dam is currently the 11th highest in the world, and the 6th highest arch dam. It was built in 1951–1957, and raised by 13.5 m in 1991.
Lago Bianco is a reservoir at the Bernina pass in the Grisons, Switzerland. Its elevation is 2,234 m (7,329 ft); its surface area is 1.50 km2 (0.58 sq mi). The current reservoir was formed by the two dams Scala and Arlas on the site of two natural lakes. Its narrow-gauge railroad is the sole rail link from the St. Moritz region to Italy, providing the highest regularly scheduled train service in Europe at this site.
Lago di Luzzone is a reservoir in Ticino, Switzerland. The reservoir has a volume of 108 million m³ and a surface area of 1.27 km2 (0.49 sq mi). It is located in the upper Blenio valley, in the municipalities of Ghirone and Aquila.
Lago di Livigno or Lago del Gallo is a reservoir in the Livigno valley. The reservoir is mostly in Italy whereas the Punt dal Gall arch dam is crossed by the border with Switzerland.
Lac du Vieux Émosson is a reservoir in Valais, Switzerland, in the municipality of Finhaut at an elevation of 2205 m. The lake drains into the reservoir Lac d'Émosson, 300 m below.
The Tieralplistock is a mountain of the Urner Alps, located on the border between the Swiss cantons of Bern and Valais. It lies between the Trift Glacier and the Rhone Glacier, just east of the lake of Gelmer.
Kraftwerke Oberhasli AG (KWO) is a Swiss energy supply company, based in Innertkirchen and operating several hydroelectric plants in the Oberhasli area of the Canton of Berne. It also operates a number of tourist attractions in the same area, mostly with some relationship to its energy supply business. It uses the brands Grimselstrom and Grimselwelt, the latter specifically for its tourism ventures. Both brands are named after the Grimsel Pass that forms the upper end of its operating area.
Handegg (Handeck) is a village in the municipality of Guttannen, Switzerland, near the lake Gelmersee. The lake may be reached by Gelmerbahn from Handegg.
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.