Mjeldeelva power plant

Mjeldeelva is located on Kvaløya in Tromsø municipality. Waterfall rights are owned by 2 farms. The landowners were aware that the river could have a good potential for power production.

Realisation of the value creation from the river was the subject of negotiations. In 2007, the landowners chose to enter into an agreement on project development with the Blåfall company, which followed the project through to the licensing decision. When the power plant was to be built, the landowners decided to continue with construction and operations through an agreement with Småkraft.

NVE granted a license in the spring of 2012. In the summer of 2014, a contract was signed with Småkraft, which assumed the risk and the work with the development itself. Excavators arrived that autumn. At the turn of the year in 2015/2016, the power plant was ready to deliver its contribution in the form of new, renewable energy and local business revenue. In the spring of 2016, the power plant was connected to the grid and the first kWh were delivered as local electricity.

The Mjeldeelva power plant blends well with the terrain and stands secluded from the rest of the settlement.

The project

The realisation of Mjeldeelva power plant has largely proceeded according to plan.
Collaboration with the local contractor and other suppliers has been good and the project has maintained excellent progress. This, in addition to an operational project team and favourable weather conditions, ensured that the project would be completed by the deadline.
Collaboration with the landowners has also been good. Their contribution in the form of local knowledge and their presence during the construction phase has enabled a smooth project implementation.

The Mjeldeelva power plant has inflow from a catchment area of 10.7 km². Minimum water flow in winter is 50 l/s, while in summer it is 200 l/s. The intake at elevation 160 and the power station at elevation 20 gives it a fall height of 140 metres. Power production is an estimated 5.7 GWh in a normal year. This corresponds with electricity consumption for 285 households.

The Pelton turbine has a maximum discharge capacity of 1,420 l/sec and drives an 1800 kVA, 690V generator. All electricity is transformed up to 22 kV and delivered to the grid.
The intake is built as a concrete threshold with an overflow. The intake structure itself is Småkraft’s own, with a prefabricated “shark fin”. The intake is well adapted to the terrain on site and appears as a modest intervention.

The pipeline is made of GRP and is buried from the intake to the station. The length is 581 m and the diameter is 800 mm.

The power station building is constructed in the well-known Småkraft style, is 80 m², built above ground and well integrated into the terrain. The outlet pipe leads into the Mjeldeelva river just above the intake to the old smolt facility.

Technical data

Rainfall field

10,7 km²

Minimum water flow

Summer: 200 l/s
Winter: 50 l/s

Intake elevation

160,0 m

Power station elevation

20,0 m

Drop height

140,0 m

Production

6,3 GWh
This corresponds to electricity for 394 households.