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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About offshore projects Germany

TenneT is investing heavily in Germany to connect offshore wind farms in the North Sea to the German high-voltage grid.


The German government is planning the construction of offshore wind farms with a total capacity of 6.5 GW, and TenneT plays a role in connecting these to the grid by 2020.

As the first European cross-border grid operator, TenneT is working on connected systems and markets in order to continue safeguarding the security of supply and to connect renewable energy sources to the grid to ensure a future-proof energy supply. Offshore wind energy is responsible for a considerable share of the Energiewende strategy. The German government is planning the construction of offshore wind farms with a total capacity of 6.5 GW, and TenneT plays a role in connecting these to the grid by 2020. To that end, technically complex projects in AC and DC technology in the North Sea and major works – both onshore and offshore – are being accelerated.

The grid connections realised so far can already transport over 4 GW of offshore wind energy to the mainland. With the infrastructural projects in the North Sea already under construction or in the pipeline, TenneT will have a transmission capacity of over 7 GW of electricity from renewables at its disposal by 2019.

Offshore wind energy in Germany

Further to statutory provisions, TenneT has been tasked with the development and operation of grid connections to offshore wind farms in its German transmission grid area since December 2006. Within the TenneT Group, TenneT Offshore GmbH is responsible for this. Acting on behalf of TenneT, TenneT Offshore takes care of the design, planning, construction and operation of offshore connections to onshore grid connection points, while TenneT itself is responsible for the connection procedure and grid control.

alpha ventus

First German offshore grid connection

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First DC power link between an offshore wind park and the high voltage grid

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Powerful offshore grid connection with a capacity of 800 megawatts

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160 kilometres long 900 megawatt DC connection

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165 kilometres of cable for a grid connection with a capacity of 800 MW

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916 megawatt power line to connect three offshore wind farms



A 900 MW grid connection for offshore wind farms

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A new substation with two converterstation at Wykhoffweg

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First grid connection for offshore wind farms in the eastern section of the North Sea.

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Direct current grid connection of wind farms in the eastern North Sea

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Our third AC grid connection

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Norderney crossing

major routes for the previously-planned offshore wind farm transmission lines were bundled through Norderney

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155 kilovolt AC grid connection

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160 kilometer long subsea cable for the connection of wind farms off the coast of Sylt

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Project overview Offshore

This is an overview of all TenneT Offshore-Projects

ProjectCapacity (MW)Commissioning
in use:
alpha ventus622009
Under construction / instructed:
Total built / instructed:        7.132
build until 2025 in line with O-NEP 2025 (Scenario B)
Three DC-Connections2.700
standing: January 2016

Related Pages

Onshore Projects Germany

Our onshore Projects in Germany

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Onshore projects Netherlands

Our Onshore projects Netherlands

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International Connections

Our International Connections

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