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 23,500 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. 



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 42 million people.

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We are TenneT

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Blockchain Technology

Can interconnected home storage systems or electric car loading stations contribute to power grid stabilisation? TenneT is using innovative blockchain solutions in pilot projects in Germany and the Netherlands to facilitate flexible access to decentralised capacities.

Challenges inherent to the energy transition

The increasing proportion of renewable energy in electricity production poses growing challenges for transmission system operators. Since solar and wind power are subject to weather-dependent fluctuations, TenneT is looking for options for controlling infeed in a more flexible way and avoiding expensive network interventions to stabilise the power grid. 

Storing renewable energy

If more wind power is generated than can be transported, wind turbines need to be locked. To date, the energy remains unused since there are no individual storage systems available for large volumes of power. By contrast, the number of home-based storage systems for private solar equipment and e-vehicle charging stations is continually growing. However, these capacities are scattered across wide distances.

Blockchain technology

A ‘blockchain’ is a database whose records, or blocks, are linked and secured cryptographically. It ensures an especially high level of transparency and enables transactions between market participants to be verified. Sounds complicated? It is. The most important aspect for TenneT: the innovative technology enables decentralised data exchanging which is as quick as it is secure.

The blockchain as a virtual power station

A pilot project is underway in the Netherlands with the energy company Vandbebron. This Amsterdam start-up is providing TenneT with flexible capacities from an interconnected pool of electric vehicles and charging stations. In a pilot project in Germany, sonnen from Allgäu, is providing TenneT with flexible capacities from interconnected home storage systems. The sonnen e-services control centre links home storage systems and adjusts charging management in line with the individual grid situation.

Pilotproject with sonnen

What expectations does TenneT have for the project?

The pilot project should show how interconnected home storage systems can help manage bottlenecks in the grid and limit the amount of expensive wind farm locking that needs to take place. 

How does it work exactly?

The linked battery storage devices can absorb or emit any excess power in a matter of seconds where required. It thus contributes to reducing transport bottlenecks in the grid

How long will the pilot project be running?

It is still in the first test phase. By autumn 2017, it should be possible for linked home storage batteries to be continually utilised in congestion management. The results will be evaluated six months later and any necessary process improvements can be made and additional market participants can be included.

Why sonnen?

The sonnen Group, which also includes sonnen e-services, is the world’s leading manufacturer of home energy batteries. The company also has extensive experience in linking and managing decentralised batteries.


Turning electric cars and household batteries into distributed energy sources (324 KB, pdf, 01/15/2018)

Source: IBM. Interview with René Kerkmeester on blockchain technology.

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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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