Sweden Gets 864 MW Pumped Hydro Storage Boost

Sweden is taking a giant leap toward reliable renewable energy with two new pumped hydro storage projects that could transform how the country powers itself.

Energy company Fortum submitted permits for facilities in Bastvålen and Lekstjärnen that would add 864 megawatts of storage capacity to Sweden's grid. That's enough to store power for hundreds of thousands of homes when the sun isn't shining and the wind isn't blowing.

Pumped hydro works like a giant battery. When renewable energy is abundant, it pumps water uphill to a reservoir. When power is needed, the water flows back down through turbines to generate electricity.

The larger facility in Bastvålen would deliver 514 MW, while Lekstjärnen would add 350 MW. Together, they represent a nearly tenfold increase from Fortum's current 90 MW of pumped storage in Sweden.

"Pumped hydro storage provides large-scale, long-duration flexibility that is essential for a resilient and reliable power system," said Mikael Lemström, Fortum's Head of Hydro Power. He called the permit applications an important milestone in creating projects with clear system value.

The Ripple Effect

These storage projects solve one of renewable energy's biggest challenges: what to do when nature doesn't cooperate. Solar panels go dark at night. Wind turbines stall in calm weather. Storage bridges those gaps.

Sweden already runs 111 hydropower plants through Fortum, making the country a leader in clean electricity. These new facilities would cement that position while helping neighboring countries transition away from fossil fuels.

The company isn't just focused on storage. Fortum operates Europe's largest battery recycling facility in Finland, giving old electric vehicle batteries new life and recovering precious materials for future use.

The Swedish Land and Environment Court will review the applications before any construction begins. Fortum hasn't made final investment decisions yet, but the permits mark a crucial first step toward a more stable renewable grid that works around the clock.

Clean energy that's always available when you need it is getting closer to reality.