ISC carries out the detailed design of the world’s biggest offshore substation Hornsea 2.

Ørsted develops the Hornsea 2 Offshore Wind Farm (HOW02) located in the UK sector of the North Sea, 115km to 155km off the coast of Yorkshire. The wind farm is to include a High Voltage Alternate Current Offshore Substation (OSS) as well as a Reactive Compensation Station (RCS).

Ørsted awarded ISC with a contract at the end of 2017 to perform the detailed engineering design of the Hornsea Two offshore substation station platform (OSS) and the Reactive compensation platform (RCS). The position of the substation is planned to be in the centre part of the wind farm.

The water depth in the area is approximately 36 m with reference to LAT. The planned substation consists of a topside in steel installed on a six-legged rectangular steel jacket fixed to the seabed by piles driven into the seabed at the four corners of the jacket.

Once completed, the project’s substation is expected to set a record with a 1,320MW capacity and a 7,500 ton topside installed on the six-legged jacket foundation. The 1.4GW Hornsea Project Two offshore wind farm will feature 165 Siemens Gamesa 8MW turbines. The offshore substation shall carry equipment for high-voltage transmission and distribution and other facilities such as emergency generator, batteries and panels for wind turbine control, etc. The topside includes a helideck.

It will become the world’s biggest offshore wind farm when operational in 2022, leapfrogging the 1.2GW Hornsea Project One, currently being constructed 120km offshore Yorkshire. The fabrication of the two structures will take place at Sembcorp Marine’s integrated yard facilities in Singapore.

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