A subsea turbine which uses tidal power to generate electricity has successfully completed initial tests off Orkney.
The turbine was lowered into position during winter storms and Scottish Power Renewables said it was performing well.
The 100ft-high 1MW (megawatt) Hammerfest Strom HS1000 device is already powering homes and businesses on the island of Eday.
There are plans to create a 10MW tidal power array in the Sound of Islay.
Testing began in December and has been designed to finalise the timetable for the Islay project, with machines being installed “as early as feasible” between 2013 and 2015.