The Fiskløysa power plant is located in Muru common forest, in the eastern part of Lierne municipality, where Statskog SF is the landowner and Nordli Mountain Council administers and manages user rights such as hunting, fishing, and grazing.
The area borders Lierne National Park to the south, with a high density of game and an intriguing geology that makes it attractive for hunting, fishing, outdoor recreation, and hiking. The species diversity is rich, varied, and partly unique in a regional and national context.
Here there are long traditions of utilizing and harvesting natural resources in the form of forestry, pastures, hunting, trapping, fishing, and berry picking. The entire area is utilized in connection with Sámi reindeer herding.
Lower parts of the area consist of highly productive forest, which gradually transitions into a more mountainous forest landscape further up in the terrain. The upper part of the hillside consists partly of genuine primeval forest.
The Muru area is in the watershed between the Norwegian Sea and the Baltic Sea, where the Fiskløysa river drains into Lake Muru and eastward into Sweden. Lake Muru has a diverse fish fauna, with species such as trout, char, lake trout, pike, whitefish, grayling, and European bullhead.
The project was developed under the auspices of NGK Utbygging AS after they took over the project from NTE and Statskog Energi, who failed to find profitability in the project. The technical plans were revised to find profitable solutions, and this led to the decision to realize the project.
The construction generally went smoothly, even though some challenges were encountered, which is not uncommon when building in natural conditions and surroundings, both with regard to local ground conditions and varying climatic conditions. In such cases, it is reassuring to have an experienced project team and experienced and skilled contractors who are able to find good solutions and avoid major delays. In this project, everything from a mobile crane overturning on the access road, deep mud holes that had to be drained with subsequent massive mass replacements, and temperatures down to -30 degrees Celsius that created challenges with frost in the pipe trench had to be dealt with.
The power plant receives inflow from a catchment area of 58 km². The minimum water flow is 300 l/s in summer and 100 l/s in winter. An intake at elevation 506 and a station at elevation 318.4 provide a head of 187.6 meters. Production is estimated at 17.9 GWh in a normal year. This corresponds to the electricity consumption of 895 households.
The Pelton turbine has a maximum discharge capacity of 3.25 m³/s and drives a generator of 5632 kVA, 6600 V. Electromechanical equipment was supplied by Spetals verk. Construction work was carried out by Namsskogan Bygg AS.
The penstock consists of GRP pipes and has a length of 2360 meters and pipe diameters of 1200, 1300, and 1400 mm, with 1/3 of each diameter. Pipe material was supplied by Brødrene Dahl AS, and the construction work was carried out by Kolbjørn Nilsskog AS. The intake dam is built on loose masses as an embankment dam with a concrete core for sealing. Fiberglass reinforcement was used in the concrete core.
The voltage is stepped up to 22 kV before the power is delivered to the grid. 2.6 km of 22 kV cable was buried up to NTE’s grid. From there, NTE buried 22 kV cable up to Nordli transformer station to replace the old overhead line.
