Estuary power

A team of researchers from Stanford University recently announced that estuaries around the globe could provide 13% of the world’s energy needs. An estuary is where a river meets the sea, and the team believes that these areas where fresh water and salt water converge could be tapped as a renewable energy goldmine. Whenever river water diffuses into salty seawater there is a slight rise in temperature – this energy could theoretically be captured and harnessed to create electricity.

Traditional systems utilize osmotic power, where salt water draws fresh water through a membrane, causing an increase in pressure. This pressure then turns a turbine to produce electricity — but the Stanford team is working on a new method. As reported by the Royal Society of Chemists, the Stanford team has developed a system that uses a battery to draw energy through a crystal lattice made of manganese dioxide nanorods. This enables a large surface area to be packed into a small space, creating the potential to generate large amounts of energy.

The system would also enable salt to be gathered so it can be converted into molten salt, which we all know can be used in power plants, wastewater treatment, energy generation and hydrogen gas production.

Well, every bit helps!