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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900 MW DC grid connection for clean wind energy from the North Sea



  • 230 km long und 900 MW capacity
  • 110 km onshore cable
  • 120 km offshore cable

Grid connection point

  • Future converter station Garrel/Ost

Status of project

  • Tendering phase; initial operation planned from 2025

About the project

In addition to BorWin1, BorWin2 and BorWin3, BorWin5 is the fourth project that TenneT is realising off the coast of Borkum using direct current technology. The project is currently in the tendering phase. 

According to the goals of the German government, a total of 15 gigawatts of offshore wind power capacity are to be available in Germany by 2030. With a transmission capacity of 900 MW, the BorWin5 project is an important component in achieving these expansion targets in Germany. BorWin 5 has a total length of approx. 230 kilometres. The starting point will be the offshore converter platform BorWin epsilon.  There, the three-phase current generated by the offshore wind farm EnBW He Dreiht will be converted into direct current and transported to the mainland by a 110-kilometer submarine cable. From the landfall in Hilgenriedersiel, the electricity will be transmitted over a length of 120 kilometres by land cable to the future converter station in Garrel/Ost close to Cloppenburg. In the converter station, the direct current is converted back into three-phase current and from there fed into the onshore extra-high voltage grid.

As with most offshore grid connection systems for wind farms in the western North Sea, the cable route from BorWin5 also runs across the island of Norderney. In order to protect the sensitive natural environment in the Lower Saxon Wadden Sea National Park and to guarantee dike safety, TenneT carries out horizontal drilling on the island, into which cable protection pipes have been inserted. Here the offshore cables for BorWin5 are pulled in during cable laying


Cornelia Junge

Spokesperson - Project Communication Offshore