The world's biggest and most powerful tidal turbine has arrived in Orkney.

The 550-tonne machine will be installed at the European Marine Energy Centre (EMEC) later this year.

Kirkwall-based Scotrenewables Tidal Power revealed the SR2000 last month after more than 12 years of design and engineering work.

It has been specially designed to cope with fast tides in places like Scotland, northern France and Canada.

The development process has cost more than £25m, including more than £1.25m from the Scottish Government.

Simon de Pietro, chief executive of investor DP Energy, said: "The sector is now beyond its emerging phase and the SR2000 device is a bold step forward proving the viability of tidal as a sustainable, reliable and predictable energy source."