The upgrade will modernize power production and contribute with increased flexibility and pumped storage for the power system in Norway.

An expansion could provide up to 750 MW of increased capacity at maximum production and pumping. The gross annual production in the Rjukan section of the Måna river is expected to increase by up to 50 percent, while net production will stay almost the same due to the effects of pumping and reduced water loss. This will optimize the current annual production of approximately 3 TWh of power from Hydro’s power plants in Rjukan.

The power plant will better utilize water resources and deliver power during periods of high demand from society. The project will create a basis for positive ripple effects and value creation in the region, and seek good solutions for land use, nature, and mass handling. Additionally, an upgrade could reduce the flood risk.

"The work to upgrade power production is part of our long-term commitment to renewable energy and Norwegian industrial development," says Kari Thørud, Executive Vice President of Hydro Energy.

During the second quarter of 2025, Hydro will start field studies and conduct an impact assessment, with the aim of submitting a concession application in the beginning of 2026.

"We are looking forward to continuing with these plans. We want broad involvement and close dialogue with local communities and municipalities. We are committed to working together to find good solutions, where we minimize the impact on nature and the environment," says Pål Thorud, Plant Manager at Rjukan

Hydro's power production in Rjukan consists of the Frøystul, Vemork, Såheim, Moflåt and Mæl power plants. Hydro has considered various options for upgrading, with all alternatives involving the continued operation of the current power plants. The alternative Hydro wants to proceed with involves a new pumped storage power plant with a new tunnel between Møsvatn and Tinnsjøen.

The power plants at Rjukan have been crucial for Norway's industrial development, where renewable energy combined with the forefront of knowledge has created the foundation for an everlasting competitive advantage for Norwegian industry.

The work to upgrade hydropower production at Rjukan is a result of Hydro's ambition to secure enough power and competitive power prices for Norwegian industry.