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Remedial works underway for Thanet

By: Tom Russell 07/10/2016 4C Offshore

General Grid Windfarms

Repair work is underway onshore for one of the Thanet offshore wind farm's export cables. A full outage is planned for four weeks across September to October in order to conduct a full repair. The work is estimated to have cost the system operator £0.6m to complete.

On the 5th March 2016 one of the two export cables connecting the project to the onshore grid failed. The cause of the failure was found to be a short-circuit inside the cable and the automatic system protection isolated the fault to ensure no other elements were affected.

After investigation, the cable fault was determined to be located onshore, near a site of special scientific interest.

With the cable system down and only one cable in operation, transmission availability slipped to 150MW. Thanet OFTO ltd, the system operator, explained that is level of availability deductions it will incur are minimal due to the cause being out of its control.

Temporary measures were put in place to facilitate the export of power generate from the offshore site with minium delay. Following the grant of consent for land access, full repair is underway.

Vattenfall installed the Thanet project’s two 26km cables in 2009 and the project started exporting power to the National Grid in 2010. It is located off the Kent coast and comprises 100 Vestas V90-3.0 turbines. With an overall capacity of 300MW, the project generates enough electricity for approximately 200,000 homes each year.

Back in February 2015, a fault was discovered in the project's other export cable and as a result, the system operator could only offer 150MW of transmission capacity. Cable recovery started on the 24th of April and was completed within two weeks.

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Remedial works underway for Thanet

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