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 23,500 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
News Corporate Dutch Market Project

COBRAcable back in operation on January 8

Downloads & Contact

The COBRAcable is planned to be back in operation on January 8, at 12:00. The COBRAcable directly connects the Dutch and Danish electricity networks since 2019, but was out of operation due to a failure in the cable since the end of September. The repair operation has been successfully performed. This re-enables the import and export of renewable electricity between Denmark and the Netherlands via the 325 kilometres long submarine interconnector.  

Since the end of September TenneT has been working hard to get the COBRAcable up and running as soon as possible after a failure in the cable was discovered. The last few weeks, a team has been working at a vessel at sea. The cable was cut at a depth of 40 metres on the seabed and lifted. On both sides of the cut cable, the cable was measured 200 metres long to find the exact fault location. 

The piece of cable where the fault has been located was removed. A new piece of cable has been installed and reconnected to the cable. The last few days, the cable has been successfully tested and laid back, buried two metres deep in the seabed. The COBRAcable connection is back in operation on Friday 8th, which means that the 700 MW connection can be used again to transport electricity between Denmark and the Netherlands. 

About COBRAcable (COpenhagen-BRussels-Amsterdam cable)

COBRAcable is a 320 kV, 700 MW HVDC submarine power cable pair between Eemshaven,  the Netherlands and Endrup near Esbjerg, Denmark. The cable is jointly owned by Energinet.dk and TenneT. Its purpose is to improve the European transmission grid and thus increase the amount of variable wind power in the system while improving supply reliability. 

The interconnector has a length of 325 kilometres (202 miles), consists of two parallel cables each with a diameter of 13 cm (5.1 in) and includes fiber-optic communication. The connection has been designed in such a way as to enable the connection of an offshore wind farm at a later stage. This contributes to the realisation of a sustainable international energy landscape, a key aim of the European Union. 

Share this:

Do you want to know more?

Jorrit de Jong

Media Relations

+31 026 373 26 00


Do you want to stay informed?

Like the

facebook page

Go to Facebook page