Nexans has reached two key milestones in its major contract to create the high-voltage power export connection for Scotland’s Beatrice 588-MW offshore wind farm. The first of the two 400-kV onshore cable links and the accessories have been installed successfully and tested on site.
At the same time, the Nexans factory in Norway has completed the manufacturing of the 220-kV offshore cable and loaded the final section onto the Group’s Skagerrak cable-laying vessel for the journey across the North Sea to the Moray Firth. This is where it will be installed and later trenched into the seabed by Nexans’ unique Capjet system.
The Beatrice Offshore Wind project, scheduled to be fully operational by 2019, is a joint venture between SSE, Copenhagen Infrastructure Partners, and Red Rock Power Limited – the UK subsidiary of China’s SDIC Power Holding Co.
To export the energy from the windfarm to the grid, the two offshore cables take a route of 70 km along the seabed to a landfall point to the west of Portgordon on the Moray coast. A transition joint bay then connects them to the onshore cable system, which takes a 20-km route to Blackhillock substation. From there, the 400-kV onshore cables will transmit the electricity to the grid.
Nexans was awarded the turnkey contract to design, manufacture, test, deliver, and install both circuits of the complete power transmission cable system. This included the delivery of a total of 265 km of cables, including 145 km of 220-kV offshore cables, 115 km of 220-kV and 5 km of 400-kV onshore cables and the associated high voltage accessories.
“The Beatrice project perfectly illustrates our capacity to deliver turnkey grid connection solutions for offshore wind farms,” said Vincent Dessale, Senior Executive Vice President for the Subsea and Land Systems business group at Nexans. “For many years Nexans has been committed to facilitating the energy transition in Europe and worldwide, and we are proud to contribute to building Scotland’s largest wind farm.”
Nexans completed the laying and burial of the first offshore cable route in 2017 and connected it to the offshore platform in February 2018. In March 2018, Nexans installed the 400 kV onshore circuits and their outdoor sealing ends using its expertise of carrying out the termination works horizontally prior to connecting them vertically at Blackhillock substation.
The offshore cables for the Beatrice Offshore Windfarm were produced in Halden, Norway and installed by Nexans Norway. The onshore cables were manufactured at Nexans Benelux facility in Charleroi, Belgium and installed by Nexans France. The associated high voltage accessories were delivered by Nexans Switzerland.
For over 15 years Nexans has been a key driver in the development of windfarm technology. It was the first company to manufacture three-core 245-kV submarine cables, as well as the first to manufacture 420-kV submarine cables. To date, Nexans cables have enabled in excess of 3,500 MW of offshore wind farm energy to be integrated into power grids across the world.