Two Australian companies are claiming they can turn ocean waves into drinking water at very little cost, thanks to a combination of their technologies.

Energetech's initial aim was to generate cheap electricity using wave power but it realised that in teaming up with desalination specialist H2AU it could use the same power to produce potable water at a low cost. Ocean waves, so abundant and consistent, are a source of energy and energy is the main expense of any desalination process.