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 24,500 kilometres of high-voltage lines, we cross borders and connect countries.

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Offshore Outlook 2050

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

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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 42 million people.

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We are TenneT

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Information for wind farm developers

The offshore grid transports wind energy generated offshore to the mainland’s electricity grid. Construction of the offshore grid contributes to TenneT’s ambition to be a driving force behind the energy transition.

In addition to the 3.5 GW laid down in the ‘Roadmap for offshore wind energy’ (2015), TenneT will connect another 6.1 GW of offshore wind energy to the Dutch high voltage grid according to the ‘Roadmap for offshore wind energy 2030’ (2019). TenneT will establish eight standard alternating current (AC) connections, each with a capacity of 700 MW, up to and including 2026. Wind farms will be built further away from the coast in the IJmuiden Ver wind energy region from 2027. Given the large capacity (2 GW per connection), and to limit the loss of energy during transport, TenneT is carrying out this connection as a direct current (DC) connection.

In 2029 a total of 9.600 MW wind energy connected:

  • Commissioning 2019: 700 MW (AC) - Borssele Alpha
  • Commissioning 2020: 700 MW (AC) - Borssele Beta
  • Commissioning 2021: 700 MW (AC) - Hollandse Kust (zuid) Alpha
  • Commissioning 2022: 700 MW (AC) - Hollandse Kust (zuid) Beta
  • Commissioning 2023: 700 MW (AC) - Hollandse Kust (noord)
  • Commissioning 2024: 700 MW (AC) - Hollandse Kust (west) Alpha 
  • Commissioning 2025: 700 MW (AC) - Hollandse Kust  (west) Beta
  • Commissioning 2026: 700 MW (AC) - Ten Noorden van de Waddeneilanden
  • Commissioning 2027: 2.000 MW (DC) - IJmuiden Ver Alpha
  • Commissioning 2029: 2.000 MW (DC) - IJmuiden Ver Beta

Discover the programme Dutch offshore grid.

Developing together

TenneT is not developing the offshore grid alone. TenneT thus undertook an intensive consultation process with various stakeholders, from the end of 2014 to the end of 2015. The consultation focused on the technology and planning associated with the design, construction and realisation of the offshore grid up to and including 2023.

The overarching goal was to work with the stakeholders to optimise the offshore grid at the lowest possible cost to society, together with the stakeholders. All the topics discussed, and the supporting documents, are listed below.

Standardisation in technology

In TenneT’s view, the best way to connect wind farm areas located relatively close to the Dutch coast to the grid is to use Alternating Current (AC) technology. The energy produced in these areas can be transmitted via a standard TenneT transformer platform that is connected to an onshore high-voltage station located near the coast via 220kV AC cables buried in the seabed.

This standardised connection system with a capacity of 700 Megawatts (MW) each is used by TenneT for the wind energy areas of Borssele (2 x 700 MW), Hollandse Kust (zuid) (2 x 700 MW), Hollandse Kust (noord) (700 MW), Hollandse Kust (west), and the area Ten Noorden van de Waddeneilanden.

The efficient connection of the wind energy areas further away from the North Sea, such as IJmuiden Ver, partly requires other techniques, such as a direct current connection rather than alternating current. A guiding principle is to develop the connections for these areas at the lowest possible societal costs, with the least disruption to the environment.

Consulted topics


All consulted technical topics are to be found here.

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All consulted legal topics are to be found here.

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Planning and other

All consulted planning and other topics are to be found here.

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Questions received

Questions can be submitted via Netopzee(at)tennet.eu. TenneT can only engage in discussions to further clarify the process, or interpretation of items, directly related to the offshore model agreements. Download the latest version of the FAQ here.

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Expert meetings

Agenda en minutes of meetings

Expert meetings have been organized every month and attended by a selected group of expert and by invitation only. Two weeks prior to the meeting, the agenda and all relevant background information to the topics discussed are made available online. Background information may include: a document defining the scope (summary of content and considerations), one or more external reports, and a position paper (TenneT's position on the topic at hand). In order to have the expert meetings as efficient as possible, present stakeholders are expected to have read these papers and documentation. This will be the starting point of the consultation.

Expert meeting November 9, 2015
Joint concluding technical and legal meeting November 9
- Report of meeting November 9

Expert meeting October 21, 2015
Agenda Expert meeting 21 October 2015
- Presentation Expert meeting 21 October 2015
- Minutes of meeting 21 October 2015

Expert meeting September 24 2015
Agenda Expert meeting September 24 2015
- Minutes of meeting
- Blue Print - Technical topics v1

Expert meeting July 2 2015
Agenda Expert meeting July 2 2015
- Minutes of meeting
- Presentation: Offshore legal framework
- Presentation: Stakeholder engagement and Consultation Process OWFs

Expert meeting May 12 & 13 2015
- Minutes of meeting
- Presentation day 1
- Presentation day 2
- Agenda Expert meeting May 12 & 13

Expert meeting April 15 & 16 2015
- Minutes of meeting
- Offshore legal framework combined
- Presentation day 1
- Presentation day 2
- Agenda Expert meeting april 15 & 16

Expert meeting March 18 2015
- Minutes of meeting   
- Presentation by TenneT - Stakeholder engagement and Consultation Process
- Abstract of RfG code
- Agenda Expert meeting March 18

Expert Meeting 29 januari 2015
- Agenda and presentation by TenneT
- Presentation by DNV GL
- Minutes of meeting

Expert Meeting 27 november 2014
- Agenda
- Presentation by TenneT
- Minutes of meeting


Consultation process for offshore grid development (417 KB, pdf, 19/12/16)

Category: Downloads Factsheet
Consultation process for offshore grid development Download Download
KCD Net op Zee (Dutch only) (2 MB, pdf, 06/12/17)

KCD Net op Zee (Dutch only) Download Download


Net op Zee

We invite offshore windfarm developers to contact us via:

Jeroen Brouwers

Media Relations