Hydro will build a new pumped storage power plant in Sogn and as part of the project establish a new 8 kilometer tunnel from Fivlemyrane (1,018 meters above sea level) to Illvatn (1,382 meters above sea level). (Photo: Bosko Janjusevic/Hydro) November 14, 2025 Hydro invests NOK 1.2 billion to build Illvatn pumped storage power plant
