TenneT contracts cable suppliers for 2 GW system
TenneT has contracted eight cable suppliers to develop a new standard for
a submarine cable system. This new cable system is required for the planned
2 GW offshore grid connections in the Netherlands (IJmuiden Ver) and Germany
(LanWin and Balwin), which set a new standard for connecting offshore wind
farms to the onshore grid.
A 525 kV High Voltage Direct Current (HVDC) extruded submarine cable system
with a 2 GW capacity has not yet been implemented in any project worldwide.
The development programme should result in a certified cable system that
TenneT can apply in the IJmuiden Ver, BalWin and LanWin projects and in
others using the same power output and voltage. This is expected to reduce
costs and minimise spatial impact.
The participating suppliers include: Hellenic Cables SA (Greece), LS Cable
& System Ltd. (Korea), Nexans Norway AS (Norway), Ningbo Orient Wires
& Cables Co., Limited (NBO) (China), NKT HV Cables AB (Sweden), Prysmian
Powerlink Srl (Italy), Sumitomo Electric Industries, Ltd (Japan) and Zhongtian
Technology Submarine Cable Co., Limited (ZTT) (China).
"It is very positive to see that multiple international cable suppliers
are participating in this programme. It shows that the sector is keen to
innovate together to produce a new standard for submarine cable systems
substantially reducing cost for society," said Marco Kuijpers,
Director Offshore Projects at TenneT.
To link 2 GW offshore grid connections to the onshore grid system, a suitable
(new) certified cable system is required. This cable system will connect
a 2 GW platform and a land station. To transport the required 2 GW power,
a submarine cable system operating at a voltage level 525 kV DC using extruded
insulation types is needed. All the participating cable suppliers will
develop and test the cable system within the time frame for the 2 GW projects
and TenneT will be in close contact with them during the entire process.
TenneT expects that the development of the 525 kV DC submarine cable system
will result in a certified cable system in Spring 2022.
The need to develop this submarine cable system is derived from the expectation
that it will reduce manufacturing and installation costs, not only for
the cable system itself but also for the entire grid concept, including
the High Voltage Direct Current (HVDC) offshore platform and the HVDC land
station. TenneT expects the bundled installation to achieve significant
Besides reducing installation costs, it is also expected to reduce dredging
costs because all cables can be put in a single trench. This approach also
results in fewer platforms and land stations, which is not only interesting
in financial terms but also ensures that TenneT causes lower emissions
and has less spatial and environmental impact.
TenneT currently operates a total of twelve offshore grid connection systems
for the transmission of wind energy from the German North Sea to land.
It now delivers a total capacity of 7,132 MW of offshore wind energy.
For more information on offshore wind
farms worldwide, click