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 23,000 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. 



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 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.

Project overview Offshore

This is an overview of all TenneT Offshore-Projects

ProjectCapacity (MW)Commissioning
in use:
alpha ventus622009
Under construction / instructed:
Total Ʃ        8.032
build until 2027
DolWin5, BorWin5, BorWin6*2.780
Total Ʃ10.812
*according to the area development plan of the BSH
**handover to TenneT still pending

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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