UK based 40South Limited is to install a 150 kilowatt wave power module outside Livorno Port in Tuscany.

The device uses two connected buoyant sections that sit one above the other at different depths. The lower section is moored to the seabed. The arms that connect them move inside each other like pistons, generating power as they move.

The whole structure sits below the sea surface and automatically adjusts its vertical position in the water depending on conditions – sinking deeper during large, potentially damaging storms. This also helps the device produce consistent levels of power.