Offshore infrastructure

The offshore electrical infrastructure includes the array cables connecting the turbines to each other and the offshore substation, the offshore substation itself and the export cable that carries the electricity to shore.

The wind turbines generate the power and array cables transport the power to the offshore substation. There are 12 rows, or strings, of array cables joining between nine and 10 turbines each. A total of 144 kilometres of array cables are buried in a network under the seabed.

The substation is located 14 kilometres from the Sussex coast. The main role of the substation is to transform the electricity generated by the turbines from 33 kilovolts (kV) up to 150 kV.

It also houses electrical components at the heart of the wind farm including transformers, switchgear and control systems, as well as auxiliary equipment such as cranes, back-up power systems and amenities. The network of underwater array cables that connect the strings of turbines meet at the offshore substation.

The offshore substation is the most complex single component of the wind farm and took almost two years to build at Babcock International Groups facility at Rosyth in Scotland.

Two parallel subsea export cables, each 16 kilometres long, transmit the power from the offshore substation to shore at Brooklands Pleasure Park.

The wind turbines generate power at 33 kilovolts (kV) and the substation transforms this up to 150kV, to reduce any losses when it is transmitted to shore.