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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North Sea Wind Power Hub

During 2017, being designated as offshore grid operator in Germany and the Netherlands, TenneT also intensified explorations of the long term offshore grid development vision, based on the Paris Agreement. In June 2016, TenneT presented its long term "Hub & Spoke" vision for large scale far offshore wind energy roll out against cost levels comparable to current small scale near shore locations.

To safeguard grid stability and system flexibility and to facilitate a cost-efficient long-term future roll-out on the North Sea, a fundamentally new approach to long term offshore grid planning is required, combining wind power in-feed, interconnection and potential sector coupling and storage; characterized by an internationally coordinated roll-out of the North Sea Infrastructure.

On the long term (after 2030), once large scale, far offshore wind areas are ready for development, an artificial island, instead of a platform, could be developed as a central hub to support the necessary energy evacuation infrastructure e.g. electrical or power to gas conversion.  The island could also host installation and O&M activities for OWF developers, as well as linking interconnectors and offshore wind farms to several countries. This concept, the North Sea Wind Power Hub (NSWPH), is further being explored by a consortium existing of TenneT Germany, TenneT Netherlands, Energinet, Gasunie and the Port of Rotterdam. The NSWPH has been submitted to ENTSO-E to be included in the next TYNDP as "under consideration".  If realized, the NSWPH would be a key piece in the European energy infrastructure system and a prime enabler of the EU's goals of market integration and renewable energy source development.

Building upon the positive experiences from TenneT's offshore grid consultation process in 2015 and early 2016, this again takes place in close cooperation with our main stakeholders the government, NGO's and offshore wind developers.  A joint fact-finding process was initiated with NGO’s during a kick-off event in Brussels in November 2017. Shortly followed by a first consultation session with developers and supply chain to create a common understanding, present first findings and gather feedback.  Input from stakeholders is essential in moving forward. The NSWPH consortium will approach stakeholders again in 2018 for further consultation in an open and transparent process in an effort to establish a common view on required first steps for the longer term.

In 2017, the following studies were undertaken to feed the debate on urgency, required system changes, hurdles and potential benefits to facilitate the NSWPH project:

  • Offshore wind capacity Dogger Bank, the offshore capacity of the different scenario’s in the English, Dutch, German and Danish part of the Dogger Bank are estimated. In total there is up to estimated 100 GW available on the Dogger Bank.
  • Translate COP21,  in order for the North Sea region to meet the Paris Agreement by 2045, an offshore wind capacity target of 230 GW the North Seas countries would be required: 180 GW of the total should be deployed in the North Sea and another 50 GW in the Baltic, Irish and Atlantic Seas.  This estimate is based on a 50% reduction in total energy demand by 2045 (relative to 2010), full de-carbonization of electricity generation and an electrification level of 45%.
  • Gap analysis ecological monitoring Dogger Bank, this report provides an explanation of the ecological significance of the Dogger Bank and the possible impact on the environment of power hub islands and windfarms. It includes an overview of the knowledge gaps and monitoring requirements.

Further information on these publicly available studies can be found at the website northseawindpowerhub.eu.


Connecting wind energy (3 MB, pdf, 11/23/2017)

The offshore grid in the Netherlands

Connecting wind energy Download Download



TenneT is participating in two major European research programmes: PROMOTioN and MIGRATE. These programmes were initiated in response to new challenges related to the development of offshore power grids and the increasingly important role of solar and wind energy.

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Offshore projects Germany

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

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The project will be a world first: a section of superconducting cable of this length has not yet been installed anywhere else in the world. 

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