Norway’s Ministry of Petroleum and Energy gave approval November 28 for Norsk Hydro to divert water from Holsbruvatn Lake to increase generation by 74 gigawatt-hours at the 375-MW Tyin hydroelectric project.
Norsk Hydro Executive Vice President Jorgen C. Arentz Rostrup said plans to use water from Holsbruvatn Lake for power production at Tyin represent one of several projects in Norsk Hydro’s program to extract more capacity from existing plants and regulated water systems. He said the plans mainly concern plants in Sogn and Roldal/Suldal.
ï¿½An expansion at Holsbru will be a small but important step toward the achievement of our goal in Hydro of increasing power production by .5 to 1 terawatt-hour,ï¿½ Rostrup, head of Norsk Hydro’s energy operations, said. ï¿½We will do this partly by building new power and pump stations, and partly by speeding up the replacement of turbine runners and associated equipment that will result in greater efficiency.ï¿½
Tyin was completed in 2004 to replace the 192-MW Tyin hydro plant that was built in 1944. Developed at a cost of 1.3 billion kroner (US$213 million), the new Tyin was to generate 1.4 TWh annually. However, there was not enough water for the project to operate continuously.
By better exploiting the catchment area of the old Tyin station, and with the help of new transmission facilities, Norsk Hydro expects to increase power production from the same water resources. An expansion of Holsbru is to increase total hydro production from Tyin to more than 1.6 TWh.