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

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Three-phase grid connection off the coast of Borkum



  • 80 km long and 113 MW capacity
  • 30 km onshore cable
  • 50 km offshore cable

Grid connection point

  • substation Emden/Borßum (220 kV)

Status of project

  • in operation since February 2014

About the project

After alpha ventus, Riffgat is the second offshore grid connection that TenneT has connected to the transmission grid using three-phase current technology. The wind farm of the same name is located within the twelve nautical mile zone of Lower Saxony, about 15 kilometers northwest of the East Frisian island of Borkum and thus about 50 kilometers from the coast. Due to the proximity to the mainland and the installed total output of 113 megawatts (MW), it was technically and economically most efficient to realize Riffgat as an individual three-phase current connection.

The 80 kilometer 155 kilovolt connection (kV) will be connected to the 220 kV grid via the Emden/Borßum substation. The existing transformer station was extended accordingly. Since February 2014, power capacities of up to 113 megawatts (MW) have been fed into the German power grid via 50 kilometers of submarine and 30 kilometers of land cable. Laying the undersea cable off the coast of Borkum was technically extremely demanding, as the route led along a dumping area for World War II ammunition. For more than 18 months, 30 tons of ammunition had to be recovered and disposed of with the utmost care and effort before the grid connection could go into operation.

Tim Dampmann

Spokesperson - Projekt Offshore Communication