One of Norway’s largest hydro-electric power plant projects

One of Norway’s largest hydro-electric power plant projects

Works at Lyse are well underway. Photo: Fredrik Ringe. 

Lysebotn II

Implenia is building the new hydro-electric power plant Lysebotn II, for Lyse Produksjon in Rogaland county. This is one of Norway’s largest hydro-electric power plant projects and will increase the power production by 15 % - using the same basin and reservoir as the existing power station.

Lysebotn II

Project scope. This project includes construction of a waterway between Lyngsvatn/Strandvatn and the power plant, this consists of an inflow tunnel from Lyngsvatn to Strandvatn, including an access tunnel at Strandvatn. Shafts for intakes at both Strandvatn and Lyngvatn will be built, as well as an intake gate at Strandvatn and a surge tunnel. Additionally a short vertical pressure shaft between the inflow tunnel and the pressure tunnel will be built, as well as sand/rock trap and two steel lined tunnels to the power plant.

Additionally there will be constructed a new access tunnel to the portal building, as well as a power plant with machine hall, inclined drift, cooling pond, transformer hall and transportation tunnels to the pressure and waste tunnels.

The new hydro-electric power station, which will replace an existing power station, will have an expected annual production of 1.5 TWh. This is an increase of 14 % (180 GWh). The hydro-electric power station will have an installed capacity of 370 MW, which represents an increase of approximately 160 MW compared to today’s levels. The increase in production is due to better utilization of the available drop height and improved efficiency of new units. The hydro-electric power station will use the same basin and reservoir as the existing power station.

Project details:

  • Contract type: Prime contract
  • Contract sum: NOK 610 million
  • Construction time: May 2014 to February 2018
  • Developer: Lyse Produksjon AS
  • Client: Lyse Produksjon AS

Technical information:

  • Blasting and supporting ca. 11 km of tunnels with cross-section from 20 to 54 m2
  • Blasting and supporting ca. 50 000 m3 caverns (power house, transformer hall etc)
  • Concrete works:
  • Ca. 18 000 m3 of concrete
  • Ca. 24 000 m2 of formworks
  • Ca. 1 200 tonn of post-tensioning steel
  • Ca. 12 200 m3 of shotcrete
  • Ca. 36 000 rock bolts