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

Innovation

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 2030

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

To Offshore 2030
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
E-Insights

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. 

E-Insights

E-Insights

Facts & figures related to TenneT facilitating the market can be found here.

Read more
Company

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 News Project

Update repairs COBRAcable

Downloads & Contact

The COBRAcable is a 325 km long submarine direct current (interconnector) that directly connects the Dutch and Danish electricity networks since 2019. The cable allows import and export of renewable electricity between Denmark and the Netherlands.  Ensuring security of supply is of great importance for Denmark and the Netherlands. The cable will structurally make Dutch capacity available to the Danish grid and vice versa. Furthermore, the cable connection has been designed in such a way that it is possible to connect a wind farm to the sea at a later stage. In this way, the cable contributes to the creation of a sustainable international energy landscape, an objective of the European Union.

Since the end of September TenneT has been working hard to get the COBRAcable up and running as soon as possible after a defect in the cable was discovered.

We first investigated whether the failure occurred onshore in or around the high-voltage substation. This turned out not to be the case. We started the first indicative measurements from land. We do this with special equipment in which a tone or a pulse is sent through the cable to investigate where approximately the defect is in the cable. Then a vessel sailed out close to the suspected fault location to send another tone or pulse through the cable to determine the exact fault location. It also needed to be determined whether an internal or external cause has caused a defect. 

At this moment, a team is working at sea from a ship.  The cable is cut at a depth of 40 metres on the seabed and lifted up. On both sides of the cut cable, the cable is measured 200 metres long to find the exact fault location(s). As soon as this has been done , more can be said about the recovery operation in the next weeks based on the new weather forecasts. 

For the repair operation, the piece of cable where the fault is located will be removed and a new piece of cable will be installed and reconnected to the cable. The cable will then also be tested immediately. If the test is successful, the cable will be laid back on the seabed and finally buried at a depth of 2 metres in the seabed.

Everything depends on the weather. We hope that the COBRAcable will be operational again at the beginning of 2021. TenneT has organised everything to meet this schedule. But that requires good weather at sea.

Share this:

Do you want to know more?

Eefje Van Gorp

Media Relations

+31 026 373 26 00

press@tennet.eu

Do you want to stay informed?

Like the

facebook page

Go to Facebook page