Daladalen

In the Daladalen project an application has been submitted to transfer the inflow from three small lakes in the upper part of Dalaåna to the reservoir Lyngsvatn to increase the generation of renewable energy in Lysebotn power plant. This will give 21 GWh (millions of kWh) of new renewable energy.

The three small lakes that are affected by the project are Longatjørna, Hefteholstjørna and Grønakråtjørna. The small lakes lie to the west of Lyngsvatn and the other reservoirs for the Lysebotn power plant.



Illustration showing Longatjørna with barrier at the outlet

Facts

 

Plan area 4,9 km2
Dam/barrier 3
Road 0 km
Water tunnels 3
Annual generation 21 GWh

 

The three small lakes that are affected by the project are Longatjørna, Hefteholstjørna and Grønakråtjørna. The small lakes lie to the west of Lyngsvatn and the other reservoirs for the Lysebotn power plant. Low concrete dams of 0.5 m, 1 m and 3 m are planned in the natural outlets of the three lakes.

With the exception of flood events, the water level will lie at the level of these intake thresholds. There will not be any active control of the water level as takes place in larger reservoirs, but a flood control in which the water varies naturally within the specified regulation height in flood situations.

A 450 metre long water tunnel was drilled to transfer the inflow from Longatjørna to Hefteholstjørna. This was followed by partly drilling and partly blasting a tunnel extending 2,050 metres from Hefteholstjørna to Lyngsvatn. In addition a 1,050 metre long tunnel was blasted from Grønakråtjørna to Lyngsvatn.

There is no need for further infrastructure or technical installations for the transfer. The project will be built without a road.

Impact assessments for the transfer have been conducted within the specialised fields of hydrology, fishing, natural environment, cultural heritage, landscape, outdoor recreation, society and natural resources. According to the impact assessments the overall impact of the initiative is insignificant to slightly negative.

The project is calculated to cost NOK 87.3 million.

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