Westermost Rough (WMR) Offshore Wind Power Project, Yorkshire, United Kingdom


Westermost Rough

The Westermost Rough offshore wind farm, the first facility of its kind to deploy the next-generation Siemens SWT-6.0-154 wind turbines commercially, is located 8km from the Holderness coast in Yorkshire, north of Hull, UK.

The wind farm is owned and operated by the joint venture of Dong Energy (50%), Marubeni Corporation (25%) and the UK Green Investment Bank (GIB 25%).

Commissioned in July 2015, the wind farm contributes to realising UK's target of installing 33GW of wind power by 2020. The 800GWh of net renewable electricity a year generated by the wind farm will be sufficient to power more than 150,000 UK homes and offset 264,429t of CO² emissions a year over its estimated operational life of 25 years.

The required construction approval from the UK Department of Energy and Climate Change was granted in November 2011, construction works began in January 2014 and first power was generated in September 2014. The project generated approximately 900 construction jobs and the wind farm's operations and maintenance base, located at the Royal Dock in Grimsby will employ 100 people.

Westermost Rough offshore wind farm financing



The Burbo Bank offshore wind project is located off the cost of the River Mersey in Liverpool Bay, Wales, UK.


The project was funded by WMR JV Investco, a UK company jointly owned by Marubeni and GIB, through funds from a consortium of lenders comprising Japan Bank of International Corporation (JBIC), The Bank of Tokyo-Mitsubishi UFJ ((BTMU), Mizuho Bank, Siemens Financial Services and Societe Generale Corporate & Investment Banking.

Westermost Rough wind farm make-up and construction

Covering an area of approximately 35km², the offshore wind farm is equipped with 35 Siemens 6MW direct drive wind turbines with a rotor diameter of 154m. The turbine's blade length is 75m, touted to be the world's longest, the swept area of each turbine is 18,600m² and the height from sea level to blade tip is 177m.

The wind farm is also equipped with an offshore substation featuring steel topside fixed on a four-legged steel jacket supported by piles. It integrates two main transformers, nine MV switchgears, two auxiliary transformers, two earthing resistors, and ancillary equipments.

Onshore construction works began in April 2013, whereas offshore construction works began in January 2014. The substation installation was completed in June 2014, the first turbine was installed in August 2014 and the final turbine was installed in March 2015, deploying A2SEA's Sea Challenger vessel.

The monopile installation works were completed in May 2014, deploying HGO Solutions' vessel named Innovation. Each monopile weighs up to 800t and has a diameter of 6.5m. Onshore activities primarily involved the installation of underground cables, with the cable ducts laid to a depth of 12m underground.

Westermost Rough grid connection details

"Commissioned in July 2015, the wind farm contributes to realising UK's target of installing 33GW of wind power by 2020."

The electricity generated by the renewable power plant is conveyed to the offshore substation via a 33kV inter-array cabling system, where the voltage is converted from low-voltage to high-voltage.

The output is then conveyed to the landfall at Tunstall via a submarine cable and further to the new Ferndale substation, before being fed to the national grid.

Contractors involved with the UK offshore wind farm

Siemens has been given the additional responsibility for the service and maintenance of the turbines for the first five years of operation.

The contract for the design of the offshore substation was awarded to Ramboll in 2011. Seaway Heavy Lifting was contracted to install the offshore substation, which was fabricated by STX France. Powell Engineering was subcontracted by Alstom to provide two 275/132kV harmonic filters and a 275kV HF AIS feeder bay for the onshore substation.

Fugro Seacore performed the drilling activities for the installation of the turbines, using its T120 pile-top rig, GeoSea installed the mono-pile foundations for the wind turbines, while MCC was subcontracted to provide the sea fastening works required for the installation of the turbine foundations.

The fabrication works for the foundations were performed by Bladt. Combilift transported the subsea cables to the wind farm.

Nexans supplied approximately 53km of medium-voltage submarine cables for the wind farm, whereas LS Cable & System supplied the submarine and extra high-voltage cables.

Technip performed the installation of the inter-array cables, VMSC was involved in laying and burying approximately 11km of export cables connecting the onshore grid, and VBMS was contracted to lay 14km of export cables. The detailed design of the cable route between the cable landfall at Tunstall and the onshore HV substation was provided by Kelvin Energy.

Cwind performed the corrosion protection works for the offshore facilities, whereas the infield and export cable protection works were performed by Tekmar, using its Teklink cable protection system.

The SCADA / vessel traffic management system (VTMS) for surveillance of vessels in and around the wind farm site was supplied by Grontmij.