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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155 kilovolt AC grid connection



  • 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

  • online since february 2014

About the project


In addition to alpha ventus, Riffgat is the second offshore grid connection completed by TenneT using three-phase alternating current (AC) technology. This grid connection consists of an 80 kilometres long 155 kilovolt (kV) connection which is integrated into the 220 kV grid at the substation Emden/Borssum. For this purpose the existing substation has been expanded. Riffgat is located within Lower Saxony's twelve nautical mile zone and about 15 kilometres to the north-west of the East Frisian North Sea island of Borkum. As a result, the wind park is located 50 kilometres from the mainland and therefore quite near to the coast. Due to this small distance to the mainland and an installed capacity of 113 MW the most efficient method to realise the project from a technical as well as from an economic perspective is  a three-phase AC technology.

The In February 2014, the wind farm has been connected to the transmission grid.


Henrike Lau

Pressereferentin - Projektkommunikation Offshore

0049 (0)5132 89-2265

Riffgat project

Built 50km from the german coast.

Project downloads

Factsheet Riffgat (german) (305 KB, pdf, 05/16/2016)

155-Kilovolt-Verbindung in Drehstromtechnik

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

Eine neue Heimat für zahlreiche Pflanzen- und Tierarten

Category: Brochures
Download Download

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 pressfootage about Riffgat