Dutch transmission system operator TenneT is to build 2-GW convertor stations and install cables with the same capacity in a bid to reduce their number and to reduce costs.
The company is currently planning the grid connection for offshore windfarms due to be brought online between 2024 and 2030 and said it plans to use 2-GW connections for the IJmuiden Ver wind area.
The transmission system operator (TSO) is to connect 6.1 GW of offshore wind to the Dutch high-voltage grid in that period. It wants to use technology that is as cost-efficient and as ‘future-proof’ as possible while protecting the environment during construction.
TenneT chief executive Manon van Beek said the plan would help accelerate the energy transition. “Based on our experiences with innovative technology in Germany, we can achieve Dutch ambitions for the development of offshore wind with fewer cables and fewer platforms and less impact at sea and on land,” she said.
TenneT’s standardised concept based on 700-MW offshore transformer stations will be used in the Hollandse Kust (West) and North of the Wadden Islands areas to ‘bundle’ electricity from the windfarms there and transmit is ashore using 220-kV cables.
In the IJmuiden Ver wind energy area, which is further out at sea, two direct current connections consisting of cables and converter stations will be used with a capacity of 2 GW. The cables used here will be 525 kV.
By scaling up to 2 GW, only two cables instead of six will be required, reducing costs overall, and they will require less space. Fewer cable routes on land will also be required.
The TSO said a connection from IJmuiden Ver to the UK could be used as an interconnector.
Ms van Beek said the plan will have a number of other benefits. “It will not only give us a lot of sustainable electricity, but in the long term it will also be an important source for green hydrogen with which sectors other than the electricity sector can take the necessary step towards sustainability,” she said.