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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Clean wind energy for around one million German households



  • 165 km long and 800 MW capacity
  • 90 km onshore cable
  • 75 km offshore cable

Grid connection point

  • converter station Dörpen/West

Status of project

  • in operation since July 2015

About the project

DolWin1 is the first offshore project that TenneT has realized off the bay of Dollart - in the so-called DolWin cluster. Since 2015, up to 800 megawatts (MW) of electricity have been transported over a distance of 165 kilometers through the North Sea and across the mainland using the powerful DolWin1 high-voltage direct current connection. The network connection runs 75 kilometers at sea and another 90 kilometers over land to the converter station in Dörpen West (Heede). Here, the wind power generated at sea is converted from direct current into three-phase current and fed into the grid.

DolWin1 connects three wind farms with a total of 184 wind turbines to the German transmission grid. In purely arithmetical terms, around one million households can be supplied with clean energy from the North Sea. From 2019, another 40 wind turbines will feed their electricity into the grid via DolWin1. DolWin1 was already the fifth grid connection that TenneT put into operation in 2015.

Anjuli Walter

Pressereferentin - Projektkommunikation Offshore für DolWin5 und DolWin