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TenneT and Vattenfall ink grid agreement

By: Tom Russell 15/01/2019 TenneT

Cables Converters General Substations Windfarms

Dutch-German transmission system operator TenneT and Swedish wind farm developer Vattenfall have signed agreements for the offshore grid connection for the Hollandse Kust Zuid I&II wind farms. The agreements concern the realisation of a connection and the transmission of electricity between the 700 MW wind farm and the Hollandse Kust Zuid Alpha offshore platform.

Vattenfall won the rights to the project in the first subsidy free public tender issued by the Dutch government in March 2018.

Marco Kuijpers, Senior Manager Offshore Nederland at TenneT: "This agreement is another fantastic step towards making the Dutch electricity system sustainable. The offshore grid is now really taking shape, first with 1,400 MW in the Borssele wind area, followed by Hollandse Kust Zuid and finally Hollandse Kust Noord in 2023. In the meantime, we’re preparing for the next North Sea projects in consultation with the Ministry of Economic Affairs & Climate."

"This is a big milestone for the project and we’re glad that it is advancing well," says Gunnar Groebler, Head of BU Wind and member of the EGM of Vattenfall. "Contracts are signed well ahead of the deadline in March this year. We are looking forward to continue our cooperation with TenneT and materialize this project as a big contribution to the Dutch energy transition."

The offshore grid system for the Hollandse Kust Zuid site comprises two transformer platforms at sea, one for Hollandse Kust Zuid I&II and another for Hollandse Kust Zuid III & IV, each with a 700MW capacity. It also features two 220 kV alternating current cables per platform, a yet-to-be-constructed onshore substation and an expansion of the existing ‘Maasvlakte’ onshore high voltage substation where offshore wind power is connected to TenneT’s Randstad 380 kV Zuidring.

The Netherlands Enterprise Agency (RVO) also recently scheduled a tender submission window for the Hollandse Kust Zuid III & IV wind farm zone. Interested parties are to submit their application between 1-14 March 2019.

The RVO is aiming for another subsidy free contract for the 700MW tender. In the event this tender procedure fails to attract an acceptable zero subsidy bid, a tender procedure including subsidies will be initiated.

The wind farm zone up for tender covers an area of 100km² in water depths ranging between 18-25m. Once the winner is selected, commissioning is anticipated by 2023.

TenneT has been officially designated by the Dutch government as offshore grid operator. This entails realising grid connections at sea with a total capacity of at least 3,500 MW, in accordance with a standardised concept of 700 MW per grid connection. The two connections from the Hollandse Kust Zuid offshore grid, which have a joint capacity of 1,400 MW, will become operational a year apart, in 2021 and 2022, in accordance with the Energy Agreement.

For more information on offshore wind farm transmission systems, click here.

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TenneT and Vattenfall ink grid agreement

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