grid connection project has been handed over to TenneT by general contractors
Siemens and Petrofac. The 900 MW project will convert three-phase electric
power generated by the Hohe
offshore wind farms into direct current and transmit it 160km back to shore.
BorWin3 has been ready for transmission since August 2019. It is the third
project TenneT has implemented in DC technology off the coast of Borkum
and brings its total transmission capacity in the German North Sea to 7,132
The foundation stone was laid for the converter station on land in May
2016. The cables on land were laid in 2015, followed by susbea cable installation
campaigns in 2017 and 2018. In September 2018, the offshore converter station
which was manufactured in Dubai was transported over a 12,000 km route
to the North Sea and installed there in October.
The 18,000 tonne topside was installed using a "float-over-process".
This meant that during installation the platform was pulled over the jacket
foundation and was positioned precisely. It was then ballasted using water
to lower the structure onto the foundation.
In total, the grid connection bridges a distance of 160 kilometres, whereby
the wind power is first transported over a 130 kilometre-long submarine
cable to the west of Borkum to Hamswehrum and, from there, over a 30 kilometre
long underground cable to Emden/East.
For more information on offshore wind developments, click