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).

Explore our key tasks


TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.

Read more
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 24,500 kilometres of high-voltage lines, we cross borders and connect countries.

Explore our grid

Offshore Outlook 2050

Already by 2030, the originally planned capacity of 15 gigawatts of offshore wind energy will increase to 20 GW.

To Offshore Outlook 2050
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.

Explore the electricity market

Transparency data

We provide transparency data on our operations on our Dutch and German transparency page and on ENTSO-E. 

To transparency pages

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.

Read more

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.

Explore our company

We are TenneT

Meet us

Horizontal drilling

The necessary energy transition brings us many challenges. For TenneT this means, for example, expanding and reinforcing its grid in order to maintain high security of supply. At least 3,000 kilometres of (underground) cable must be laid in Germany and the Netherlands in the next 10 years. We want to carry out this work with as little impact as possible on the environment: people and (vulnerable) nature.

Undergrounding of cables by means of drilling can be a good solution. This is currently only possible over a limited length. Together with our contractors, we want to develop the techniques further and investigate in the Netherlands which maximum horizontal drilling lengths are possible in order to realise connections faster and with less inconvenience to the surroundings. The aim is to further develop our construction techniques for underground cable routes to minimise the impact on people and the environment. 

Open excavations like this cause a lot of inconvenience. With horizontal drilling, this is prevented as much as possible.

Joint efforts

Together with various market parties, we have successfully worked on possible solutions in recent years. Together with cable supplier Prysmian and contractor Heijmans, various techniques have been studied that should make horizontal drilling possible up to a maximum of 5 kilometres in one go. The major advantage is that the use of these techniques causes less inconvenience to local residents and routes are often shorter. Not only can the work be done more quickly than open excavation, it also places less burden on nature and the landscape. Permit procedures are also expected to be shorter. 

Multiple methods

The study of various drilling techniques shows that there is no "holy grail" in the field of innovative drilling methods for long distances: The various aspects of each situation, such as the environment and the soil , as well as the diameter of the cable, must be considered in order to apply the most optimal drilling technique. And also consider aspects such as accessibility of the cable in the event of failure, the diameter of the cable (and therefore the size of the reels), the transport of cables and conduits and the manufacture of conduits on site. 


We have successfully completed the first pilots with the E-Power-Pipe method, developed by Herrenknecht. Using this method, we drilled a distance of 2 kilometres horizontally in one go for the first time. A length that counts as a prelude to the desired 5 kilometres.

Shorter repair time

The most important advantage of this technique compared to other drilling techniques is the repair time. This is due to the shallow location of the cable of 2 to 3 metres below ground level, in contrast to cables that are now often 5 to even 25 metres deep (depending on their length).

Because of its shallow location, the cable is much easier to approach and can be repaired within two weeks. As a result, the potential maintenance costs are considerably lower. In addition, drilling with EPP has less impact on the environment and (vulnerable) nature. We applied this technique for the first time in the Tilburg Noord - Best project. 

Watch the animation by Herrenknecht

Watch the animation on the website of Herrenknecht if you are curious how this works. The implementation of the pilot project in Tilburg Noord-Best is expected to start in October 2021. This will be the first time in the Netherlands that such a length will be drilled underground, using this technique.