Møsvatn or Møsvann is a lake in Vinje Municipality in Vestfold og Telemark county, Norway. It is the tenth-largest lake in Norway with a surface area of and a volume of . The lake lies just east of the Hardangervidda National Park, in Skien watershed (Skiensvassdrag) catchment area. The lake discharges into the Måna river at a dam located on the Vinje-Tinn municipal border (so a very small part of the lake crosses into Tinn Municipality too). The lake has an irregular shape with three arms. The longest length across the lake is about . Møsvatn is a shallow mountain lake by Norwegian standards, reaching a maximum depth of .
From 1904 to 1906 dam was constructed and the lake was filled to begin hydroelectric power production. The lake's surface now sits at an elevation of about above sea level with the dam on the southeast end of the lake regulating the water level. Møsvatn is Norway's fourth largest hydroelectric power reservoir with an energy content corresponding to approximately .
There are a few islands located in the lake. The main island of Hovdeøyi is the location of the village of Møsstrond where Møsstrond Church is located. There are several small, isolated farm communities located along the borders of the lake, most of which do not have road connections, so the main mode of transportation is by boat. Some of Norway's highest mountain farms can be found around the lake. The museum and visitor's centre Hardangervidda Natursenter is located close to the lake. Boat trips on the M/B Fjellvåken II can be taken from Skinnarbu to Mogen along the border with Hardangervidda. Along the shores of the lake, many traces of Stone Age settlers can be found.
On 19 November 1942, as part of the efforts to sabotage German heavy water production, glider-borne troops were to land on the frozen lake Møsvatn near the Vemork hydroelectric plant, run by Norsk Hydro, near the town of Rjukan. This effort was not successful; however ultimately the Norwegians stopped the heavy water production activities and helped limit the German nuclear weapons research program.
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Vemork is a hydroelectric power plant outside Rjukan in Tinn, Norway. The plant was built by Norsk Hydro and opened in 1911, its main purpose being to fix nitrogen for the production of fertilizer. At opening, it was the world's largest power plant with a capacity of 108 MW. Vemork was later the site of the first plant in the world to mass-produce heavy water developing from the hydrogen production then used for the Haber process. During World War II, Vemork was the target of Norwegian heavy water sabotage operations.
Tinn is a municipality in Telemark in the county of Vestfold og Telemark in Norway. It is part of the traditional regions of Upper Telemark and Øst-Telemark. The administrative centre of the municipality is the town of Rjukan. The parish of Tin(d) was established as a municipality on 1 January 1838 (see formannskapsdistrikt). The area of Hovin was separated from the municipality of Tinn in 1860, but it was merged back into the municipality of Tinn on 1 January 1964. Krossobanen is the oldest aerial tramway in Northern Europe.
Rjukan (ˈrʉ̀ːkɑn) is a town and the administrative centre of Tinn municipality in Telemark, Norway. It is situated in Vestfjorddalen, between Møsvatn and Lake Tinn, and got its name from the Rjukan Falls west of the town. The Tinn municipality council granted township status for Rjukan in 1996. As of 2022, the town has 3,003 inhabitants. The town was essentially "built from scratch" with industrial developments by Norsk Hydro in the 1910s and 20s. At its peak, Rjukan was a significant industrial center of Telemark.