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A tidal energy turbine installed in the sea off Orkney last year has already generated more electricity in its first 12 months than Scotland's entire wave and tidal sector before it.

The BBC said the 2MW prototype turbine Scotrenewables SR2000 has generated 3GWh (gigawatt hours) of electricity.

According to the European Marine Energy Centre in Orkney 30 different devices tested by them have generated a combined 2.8GWh of electricity.

The SR2000 is different from older prototypes - which were machines similar to wind turbines fixed to the seabed - in that it more resembles a boat.

Andrew Scott, chief executive officer of Scotrenewables Tidal Power, told the BBC the 63m prototype's result was "phenomenal".

He said: "We've generated over three GWh into the Scottish grid. That's more than three times any prototype system that's come before us and, in fact, cumulatively that's more power generated in 12 months from this single turbine than the entire wave and tidal energy sector has done in Scotland in the 12 years preceding the launch of this turbine."

The SR2000 was installed in the Fall of Warness in August 2017.

At points it has been able to power more than a quarter of Orkney's homes.

Jonathan Lindsay, from Emec, said: "Wind has had about 50 years from when it first started, whereas wave and tidal has really been over the last 10 years or so and has actually made quite a lot of progress in that time.

"As we move forward we will see bigger and bigger machines coming along."