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 23,000 kilometres of high-voltage lines, we cross borders and connect countries.

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Grid maps

Maps of our onshore and offshore high-voltage grid.

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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 41 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

DolWin6 is the latest offshore grid connection project of TenneT: In July 2017 TenneT commissioned the construction of the project. Completion is scheduled for 2023. Like the other two DC projects currently under construction from TenneT, 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 undersea cable. At sea, the island of Norderney is crossed under by horizontal drilling. From the Hilgenriedersiel landing point, the electricity is transmitted to Emden/East via another 45 kilometre underground 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.

Offshore wind farms are competing in an auction procedure at the Federal Network Agency for a connection to DolWin6 and the offshore wind farm Gode Wind 3 has already been awarded a contract. Further offshore wind farms will be determined in future auction rounds.



Cornelia Junge

Press Referent - Project Communication Offshore

0049 (0)5132 89-2357