Nedre Otta hydropower plant in Norway
A contract of 85MW Nedre Otta hydropower plant in Sel and Vågå, Norway has been signed, which is worth NOK 657M (US$81 million).
The hydropower project involves about 12,000m of tunnel work, construction of the power station and transformer hall and concrete work around the intake, power plant area, outflow and portal.
Nedre Otta power plant will use the existing intake dam at Eidefossen power plant. The water will travel through tunnel from the intake to the new power plant. It will have an installed capacity of 85 MW and the annual production from the plant will be about 315 GWh.
The construction work will be commenced in October 2016 and completed in the spring in 2020. It will also be ensured that the practice of rafting, canoeing and fishing basically can be continued as before in the area during summer.
The power plant is mainly built in the mountain and the impact of nature will be limited. While construction difficulty will be determined by complexity of geological condition. During hydropower plant construction, SDA bolt can be used not only for slope protection, but also for tunnel reinforcement. Through drilling, grouting and anchoring effect, close joint can be formed between Self drilling anchor bolt and structural body, which then can reach to the goal of permanent support and deformation prevention.