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 over 22,500 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 41 million people.

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We are TenneT

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Net op zee Borssele

The future grid connection 'Borssele' consistst of two connections of 1,400 megawatts (MW) in total. The connection Borssele Alpha will go into service in 2019 and Borssele Beta in 2020.

About the grid connection

From the platforms there will be a total of four alternating current cables that run to the mainland. The offshore cables will be routed via the Western Scheldt river and will come ashore near the existing high-voltage substation at Borssele, where they will be connected to the substation via underground 220 kV cables. The Borssele substation will be expanded to create extra room for the transformers required to convert the voltage level from 220 kV to 380 kV. The national 380 kV high-voltage grid will then distribute the wind energy to households across the country. 

TenneT has officially been appointed as offshore grid operator in the Netherlands, and will develop -as contribution to the Energy Agreement- at least 3,500 MW of offshore-connections until 2023; all with a standardised concept of 700 MW per connection.

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Borssele offshore grid connection:

Latest developments

Site V

Prior to the subsidy tender Borssele V, expected early 2018, TenneT has published the model agreements applicable to the connection of site V: please download here Model Borssele V agreements.

Questions regarding the offshore grid can be submitted via netopzee(at)tennet.eu

Site III and IV

Prior to the subsidy tender Borssele III and IV in September 2016 TenneT has published a number of updates:

22 June 2016 the Interface Risk Inventory Session was held. This workshop was organised to create an inventory of the main interface risks from the wind farm perspective, to ensure TenneT is aware of all relevant interface topics at an early stage in the development process. TenneT wishes to thank all the participants of the Risk Inventory Session for their valuable contributions. The presentation and the report of the workshop are now available:

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Service Center

0800 836 63 88

Jeroen Brouwers

Media Relations

+31 (0)26 373 26 00


Consultation process for offshore grid development (417 KB, pdf, 12/19/2016)

Category: Downloads Factsheet
Consultation process for offshore grid development Download Download
Connecting wind energy (3 MB, pdf, 11/23/2017)

The offshore grid in the Netherlands

Connecting wind energy Download Download
KCD Net op Zee (Dutch only) (2 MB, pdf, 12/06/2017)

KCD Net op Zee (Dutch only) Download Download


Programme offshore grid

By means of the National Energy Agreement, the Dutch government wants to achieve a substantial increase in the share of wind energy in the Netherlands’ energy mix. To increase offshore wind energy capacity, the government has designated three zones in the North Sea for the development of new wind farms.

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Net op zee Hollandse Kust (zuid)

The grid connection of the future 'Hollandse Kust (zuid)' offshore wind area will be 1400 megawatts (MW), consisting of two connections each of 700 MW.

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Net op zee Hollandse Kust (noord)

The future grid connection 'net op zee Hollandse Kust (noord)' will bring offshore wind energy ashore. It consists of one platform with a capacity of 700 megawatts (MW). It will be connected to the Randstad 380 kV North Ring and will be operational in 2023.

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