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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Third AC grid connection



  • 32 km long and 111 MW capacity
  • 4 km onshore cable
  • 28 km offshore cable

Grid connection point

  • substation Inhausen (220 kV) Germany

Status of project

  • commissioning planned for 2016

About the project


In the Nordergründe project within Lower Saxony's twelve nautical mile zone TenneT is realising the third AC grid connection for an offshore wind farm. The project consists of a 32 kilometres long 155 kilovolt (kV) connection with a capacity of 111 megawatt (MW). The grid connection point is the substation Inhausen (to the north of Wilhelmshaven), where the power generated offshore is fed into the 220 kV grid. For this purpose the present substation was expanded. Since the substation of the wind farm is only 28 kilometres from the coast and the installed capacity constitutes 111 MW, the most efficient method to connect the wind farm from a technical as well as from an economic perspective is an AC grid connection. The horizontal drillings below the dyke at the landing point near Hooksiel are completed, the four kilometres of land cable have been laid and the works at the substation in Inhausen have been completed. The laying of the 28 kilometres long subsea cable and the start of operation are planned for 2016. This date results from the changed project schedule of the wind farm.


Henrike Lau

Pressereferentin - Projektkommunikation Offshore

0049 (0)5132 89-2265

Nordergründe project

The laying of the 28 kilometer long undersea cable and the implementation are planned in 2016.

Project downloads

Factsheet Nordergünde (german) (297 KB, pdf, 05/16/2016)

Einzelanschluss in Drehstromtechnik

Category: Brochures
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Die Naturschutzprojekte von TenneT (german) (785 KB, pdf, 08/02/2016)

Aufwertung der Lebensräume von zahlreichen Pflanzen- und Tierarten

Category: Brochures
Die Naturschutzprojekte von TenneT (german) Download Download

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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.

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