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 over 22,500 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. 


Energy transition

Wind turbines and solar panels are the physical signs of consumers’ growing desire for clean, renewable energy.

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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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165 kilometres of cable for a grid connection with a capacity of 800 MW



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

Grid connection point

  • converterstation Dörpen West Germany

status of project

  • online since july 2015

About the project


DolWin1 is a 165 kilometres long direct current (DC) grid connection with a capacity of 800 megawatt (MW), which TenneT put into service in July 2015. In the offshore platform DolWin alpha, the alternating current (AC) generated by the wind farms is converted into DC power and transmitted via 75 kilometres of subsea cable  and 90 kilometres of land cable to the corresponding converter station in Dörpen West in Emsland. In Dörpen/West the DC power is re-converted into AC power and fed into the onshore transmission system.


Henrike Lau

Pressereferentin - Projektkommunikation Offshore

0049 (0)5132 89-2265

DolWin1 project

165 kilometres of cable for a grid connection with capacity of 800 MW.

Project downloads

Factsheet DolWin1 (300 KB, pdf, 09/07/2016)

75 Kilometer von See an Land

Factsheet DolWin1 Download Download
Restauration of Mittelplate (german) (2 MB, pdf, 05/08/2016)

Eine neue Heimat für zahlreiche Pflanzen- und Tierarten

Category: Brochures
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TenneT Offshore brochure

"Energie von See an Land" brochure about TenneT offshore projects and technology (german only)

Offshore projects in Germany

Our other german offshore projects.

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Media footage

Your way to our pressfootage about DolWin1.

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