Hornsea construction chalks up a world-first with 4,000 tonne offshore addition

By Grimsby Telegraph | Posted: 29 Jun 2018

A first ever in offshore wind has been racked up out of the Humber.

Hornsea Project One's offshore reactive compensation station (RCS) has just been installed, required due to the sheer distance of the wind farm from the shore

Weighing around 4,000 tonnes, the rig-like structure allows transmission of the green electricity with High Voltage Alternating Current through much longer cables than would otherwise be possible.

The reactive compensation station.

The green power is already ramped up from medium to high voltage by the 'traditional' offshore substations within the array of 174 turbines located 120km off the coast.

Read more: Hull's biggest blade order yet is signed off as Orsted partners with Siemens Gamesa

The RCS is roughly equidistant between the wind farm and the shore, with power hitting landfall at Horseshoe Point and skirting North East Lincolnshire to a £25 million onshore substation at North Killingholme. 

Where the projects are located.

Featuring a heli-pad for easy access from Humberside, it is made up of a jacket foundation and a topside which weigh 1,500 tonnes and 2,500 tonnes respectively.

When completed in 2020 Hornsea Project One will be the biggest offshore wind farm in the world, capable of supplying electricity to well over one million homes.

Read more: First quarter energy stats underline wind's role in the mix

The current world’s largest offshore wind farm is London Array, 630MW, which will be over taken by Ørsted’s Walney Extension (at 660MW) later this year. Hornsea Project One will have a capacity of nearly double that 1.2GW – and will be the first wind farm ever with a capacity above 1GW.

Work to bring the cable ashore at Horseshoe Point. Picture: Guy Lister. 

It will be immediately followed by Hornsea Project Two, which will break the record for the largest, once again, all controlled out of Grimsby. The nearest, and furthest turbines will, however, be closer to shore. 

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