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.

To Offshore Outlook 2050
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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We are TenneT

Meet us


First German DC connection to a wind farm at sea



  • 200 km long und 400 MW capacity
  • 75 km onshore cable
  • 125 km offshore cable

Grid connection point

  • converter station Diele

Status of project

  • in operation since April 2010

About the project

BorWin1 is the first grid connection with which TenneT has connected a wind farm to the grid using direct current technology. Up to 400 megawatts (MW) of clean electricity from the BARD Offshore 1 wind farm will be transported via a high-voltage direct current transmission line (HVDC) through the North Sea and overland by cable to the landside grid connection point - the converter station in Diele. From there, it is fed into the German transmission grid and distributed to consumption-intensive regions. The project name is based on the Borkum wind farm cluster located in the western North Sea.

The cable connection comprises 125 kilometres of sea and 75 kilometres of land cable. With a total distance of 200 kilometres, BorWin1 was back then the longest connection ever built for the grid connection of an offshore wind farm. Efficient HVDC technology is particularly suitable for long distances and high transmission capacities in order to transport the electricity generated at sea into the grid with as little loss as possible. Both are given in the BorWin1 project.

The heart of the BorWin1 grid connection is the BorWin alpha offshore converter platform weighing around 5,000 tons. With the help of the Thialf floating crane - with a length of over 200 metres and a width of around 88 metres the largest floating crane in the world - the platform was towed from its production site in Vlissingen in the Netherlands to its destination in the North Sea. It was then installed there for several months and equipped for operation. BorWin1 has been feeding electricity into the German transmission grid since December 2010.

Cornelia Junge

Spokesperson - Project Communication Offshore