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 22,000 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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Net op zee Hollandse Kust (zuid)

The future grid connection 'Hollandse Kust (zuid)' consists of two connections of 1,400 megawatts (MW) in total. The connections will be operational in respectably 2021 and 2022.

About the grid connection

From the platforms there will be a total of four alternating current cables that run to the high-voltage substation De Maasvlakte on the mainland. 

Onshore they will be connected to the the Randstad 380 kV South Ring.. Hollandse Kust (zuid) Alpha will go into service in 2021 and Hollandse Kust (zuid) Beta in 2022.

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.

Visit our website for more information.

Hollandse Kust (zuid) offshore grid connection:

Connecting HKZ (77 KB, jpg, 07/17/2017)

Connecting HKZ Download Download

Latest developments

  • Model agreements and General Terms and Conditions for a connection to Hollandse Kust (zuid)Alpha, in Dutch and English (for information only)
  • Annexes to the model agreements: download here
  • Memo on root loci HKZ: download here
  • Q&A document 15 december 2017: download here

General questions can be submitted to netopzee(at)tennet.eu; please note answers will be published in an anonimised format.

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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 Borssele

The grid connection of the Borssele offshore wind area will be 1400 megawatts (MW), consisting of two connections each of 700 MW. The Borssele grid connection will comprise two platforms that TenneT will build (called Alpha and Beta).

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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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