Our key tasks

We are primarily tasked with providing power transmission services, system services and facilitating the energy market. Our core tasks follow from our appointment as grid operator under the Dutch 'Elektriciteitswet' (E-wet) and the German 'Energiewirtschaftsgesetz' (EnWG).

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TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.

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Our grid

TenneT manages the high-voltage grid in the Netherlands and large parts of Germany. TenneT transmits electricity at 110,000 volts (110 kV) and higher. With around 24,500 kilometres of high-voltage lines, we cross borders and connect countries.

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Offshore Outlook 2050

Already by 2030, the originally planned capacity of 15 gigawatts of offshore wind energy will increase to 20 GW.

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Electricity market

The energy sector is developing rapidly. The process of European market integration began some years ago. Its purpose is to create a single European market that enables market parties to trade gas and electricity across national borders easily and efficiently.

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Transparency data

We provide transparency data on our operations on our Dutch and German transparency page and on ENTSO-E. 

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Our vision is to be one of the most transparent Transmission System Operators (TSO) in Europe and thereby creating value for society. In this Energy Insights section we present selected energy related topics and show data, information and valuable insights. 



Facts & figures related to TenneT facilitating the market can be found here.

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TenneT is a leading European electricity transmission system operator (TSO), with activities in the Netherlands and in Germany. We strive to ensure a reliable and uninterrupted supply of electricity in our high-voltage grid for some 42 million people.

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We are TenneT

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More wind power from the North Sea from 2023



  • 90 km long and 900 MW capacity
  • 45 km onshore cable
  • 45 km offshore cable

Grid connection point

  • converter station Emden/Ost

Status of project

  • initial operation planned for 2023

About the project

In July 2017 TenneT commissioned the construction of the project DolWin6. Completion is scheduled for 2023. Like the preceding projects DolWin3 and BorWin3 DolWin6 is a 900 megawatt DC connection.

On the associated offshore platform DolWin kappa, the three-phase current generated by the offshore wind farms is converted into direct current and transported to Hilgenriedersiel on the mainland by an approximately 45 kilometre long sea cable. From the landfall in Hilgenriedersiel the electricity is transmitted to Emden via another 45 kilometre land cable. Here, TenneT is building a converter station and a transformer station to convert the direct current back into three-phase current and feed it into the power grid onshore.

Like most of the offshore grid connection systems linking wind farms in the Western part of the North Sea to the onshore grid the cable route of DolWin6 leads across the island of Norderney. In order to protect the sensitive nature in the Wadden Sea National Park and to ensure the integrity of the dykes TenneT carried out horizontal directional drillings with a length of up to 1.300 metres on the island. TenneT has pulled protective conduits into the bore holes where the DolWin6 sea cables will be pulled in within the next years.


Tim Dampmann

Spokesperson - Projekt Offshore Communication