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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TenneT and Energinet.dk – the operators of the Dutch and Danish high-voltage electricity grids – are installing a high-voltage direct current submarine cable that will interconnect the electricity grids of the two countries.



  • In the Netherlands: 1 kilometre of onshore cable and a converter station
  • In Denmark: 25 kilometres of onshore cable and a converter station


  • Offshore in the Netherlands, Germany and Denmark: 300 kilometres 

Project status

  • 2016 Start construction
  • 2019 Completion

Interconnection between the Netherlands and Denmark

The COBRAcable will have a capacity of approx. 700 MW, will be around 325 kilometres long, and will run from Eemshaven (the Netherlands) to Endrup (Denmark) via the German sector of the North Sea. Two onshore converter stations – one in the Netherlands and one in Denmark – are needed to connect the cable to the existing grids. 

The construction of the COBRAcable will produce benefits for both countries. More renewable energy can be imported, particularly wind energy generated in Denmark. Safeguarding the security of supply is very important to Denmark. The COBRAcable will make Dutch capacity structurally available to the Danish electricity grid, and vice versa. The connection will also be designed in such a way as to enable the connection of an offshore wind farm at a later stage. This will contribute to the realisation of a sustainable international energy landscape, a key aim of the European Union. 

EU support

The COBRAcable is a cross-border project of European significance. The European Commission has therefore allocated a subsidy to the project under the EU Economic Recovery Plan.


Map COBRAcable (44 KB, jpg, 04/17/2016)

Map COBRAcable Download Download
Business case COBRAcable (2 MB, pdf, 10/05/2018)

Business case COBRAcable Download Download
Procurement for commissioning (39 KB, pdf, 08/30/2019)

Procurement for commissioning Download Download


Service Center

0800 836 63 88

Armine Egberink

Woordvoerder project

+31 (0)6 57 71 15 67

Jeroen Brouwers

Media Relations

+31 (0)26 373 26 00

Related projects


This two-way 1,000 MW high-voltage connection has a length of 260 km and runs from the Isle of Grain (in Kent) to Maasvlakte (near Rotterdam). The operational and technical management of the cable is in the hands of BritNed Development Ltd, a joint venture of British energy company National Grid and TenneT subsidiary NLink International.

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The exchange of power enabled by NordLink will increase security of supply for the German and Norwegian grid and will allow exchange of renewable energies, especially hydroelectric power and wind power, between both countries. In addition it will give more stable electricity prices on both sides and, further on, also will facilitate European market integration.

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The Dutch and Norwegian electricity grids have been interconnected by the NorNed cable since 2008. The NorNed cable is 580 km long and has a capacity of 700 MW, making TenneT and our Norwegian counterpart Statnett the joint owners of the world’s longest subsea high-voltage direct current cable link.

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