TenneT develops innovative submarine cable with suppliersEngineering360 News Desk | April 22, 2020
Electricity transmission system operator TenneT is preparing to implement grid connections for new offshore wind farms which will supply 40% of electricity for the Netherlands. Eight 0.7 GW AC grid connections are already planned and two 2 GW offshore grid connections will be built in the IJmuiden Ver wind energy area. Three additional 2 GW offshore grid connections in the LanWin and Balwin area will lift TenneT’s offshore grid connection capacity in Germany to more than 17 GW until 2030.
The company has contracted eight cable suppliers to develop a new standard for a submarine cable system, as a 525 kV high voltage DC extruded submarine cable system with a 2 GW capacity does not currently exist. The development initiative should result in a certified cable system which TenneT can apply in the IJmuiden Ver, BalWin and LanWin projects as well as projects using the same power output and voltage, resulting in reduced costs and spatial impacts.
In addition to reducing installation costs, the new system is also expected to reduce dredging costs because all cables can be put in a single trench. This approach translates into fewer platforms and land stations, which ensures that TenneT operations lower emissions and environmental impacts.
TenneT expects that the development of the 525 kV DC submarine cable system will result in a certified cable system in spring 2022. The participating suppliers are Hellenic Cables SA (Greece), LS Cable & System Ltd. (South Korea), Nexans Norway AS (Norway), Ningbo Orient Wires & Cables Co. (China), NKT HV Cables AB (Sweden), Prysmian Powerlink Srl (Italy), Sumitomo Electric Industries Ltd (Japan) and Zhongtian Technology Submarine Cable Co. (China).