Ocean Salinity Gradient Power Prototype Station Goes Live in Norway: Zero-Emission Energy Where Freshwater Meets Seawater
Norway's Statkraft has commissioned the world's first commercial-scale ocean salinity gradient power prototype station in Tofte, generating electricity from the osmotic pressure difference between freshwater and seawater, with daily output sufficient for 200 households.
Ocean Salinity Gradient Power Prototype Station Goes Live in Norway: Zero-Emission Energy Where Freshwater Meets Seawater
Norwegian state power company Statkraft officially commissioned the world's first commercial-scale ocean salinity gradient power prototype station on June 11 in Tofte, Norway. The station harnesses the osmotic pressure difference between freshwater from the Glomma River flowing into the North Sea and seawater to drive turbine generators, with an installed capacity of 2 megawatts and daily output of approximately 32,000 kilowatt-hours — enough to power about 200 Norwegian households.
The principle behind salinity gradient power is to separate freshwater and seawater with a semi-permeable membrane. Freshwater naturally migrates through the membrane toward the seawater side due to osmotic pressure, driving water flow through a turbine. Each cubic meter of freshwater mixing with seawater releases approximately 1.5 kilojoules of free energy.
Statkraft estimates that the theoretical total salinity gradient energy available at river mouths worldwide is approximately 2 trillion kilowatt-hours per year, equivalent to 12% of global electricity demand. However, the cost and durability of semi-permeable membranes remain the primary bottlenecks to scaling the technology.
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