Japan pilots osmotic power generation using saltwater and freshwater

Japan has piloted a project to generate renewable electricity from the natural interaction between saltwater and freshwater, BGR reported. The system uses osmotic power technology to create energy for coastal locations. [1]

The power plant operates by placing a specialized membrane between saltwater and freshwater sections. According to BGR, the membrane permits water molecules to flow from the freshwater side to the saltwater side while blocking most salt contents. [1]

The continuous movement of water across the membrane increases the liquid volume on the saltwater side. BGR reported that this process, called osmosis, generates water pressure that can be converted into usable electrical energy. [1]

Japan remains a major global energy consumer that relies heavily on foreign imports, as domestic resources are limited. Fossil fuels accounted for 67 percent of Japan's primary energy in 2023, while the nation imported 97 percent of its oil as of 2022. [8]

Emerging osmotic technology offers another renewable alternative for nations with extensive coastal infrastructure. The pilot plant demonstrates a operational method for generating power alongside established wind and solar installations, BGR reported. [1]