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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Powerful offshore grid connection for 800 megawatts



  • 200 km long and 800 MW capacity
  • 75 km onshore cable
  • 125 km offshore cable

Grid connection point

  • Diele in Germany

Status of project

  • online since january 2015

About the project


With the BorWin2 project, TenneT has realised a 200 kilometres long, 800 megawatt direct current (DC) grid connection.

The wind farms Veja Mate und Global Tech 1, which are located more than 100 kilometres from the coast, can use this connection to feed large quantities of wind power into the grid.

The land route from Hilgenriedersiel to Diele is about 75 kilometers long and runs parallel to the first route for the BorWin1 Project.

In July 2010, TenneT started the preparatory horizontal drill holes on the island of Norderney and onshore in Hilgenriedersiel to pull in the HVDC cable system. In 2011/2012 the land cables and the underpass beneath the Ems River were laid. 125 kilometers of subersea cable were laid in the summer of 2012. The AC subsea cables for connecting the wind farm Global Tech 1 to the converter platform BorWin beta were laid in 2012 and 2013. The erection of the converter platform BorWin beta offshore took place in April 2014.

At the onshore converter station in Diele, the DC power coming from the sea is converted into AC power and afterwards fed into the transmission system.

BorWin2 was officially put into service on 30 January 2015.

Contact details for the project

Cornelia Junge

Pressereferentin - Projektkommunikation Offshore

0049 (0)5132 89-2357

Project downloads

Factsheet BorWin2 (german) (258 KB, pdf, 05/08/2016)

Project factsheet about our offshore project BorWin2

Category: Brochures
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Restauration of Mittelplate (german) (2 MB, pdf, 05/08/2016)

Eine neue Heimat für zahlreiche Pflanzen- und Tierarten

Category: Brochures
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Also interesting

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 press footage of BorWin2.

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