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. 


Energy transition

Wind turbines and solar panels are the physical signs of consumers’ growing desire for clean, renewable energy.

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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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Diemen - Lelystad - Ens

The existing 380 kV Diemen-Lelystad-Ens line will be made suitable to transmit more electricity (including sustainably generated energy). The production of renewable energy, both wind energy and solar energy, exhibits peaks and dips and requires the transmission of electricity over longer distances. This makes it necessary to increase the transmission capacity of the line.



  • Upgrade 380 kV line for transport renewable energy
  • Upgrade substations Lelystad, Diemen en Ens for more transport capacity.


  • Research Winter 2015/2016
  • Results innovation study summer 2016

About the project

Innovation study

TenneT will first conduct a study into smart and innovative yet proven techniques and working methods that will enable the construction work to be completed more quickly. The study is aimed at developing innovative solutions for the pylons, the conductors (i.e. the high-voltage wires), and the performance of work. The results are expected to become available in the summer of 2016.

Field studies

TenneT has begun to make preparations in order to take the necessary measures once an optimal solution has presented itself. In the winter of 2015/2016, TenneT conducted  a number of field studies at the sites of the pylons. By performing these activities, we intend to minimize any damage to crops and harm to local flora and fauna, for instance by taking the breeding seasons of certain bird species into account.

The field studies consisted of soil analyses and cone penetration tests at the pylon sites. The study results are relevant to the performance of the work. TenneT prepares work sites and constructs building site roads for work on pylons and conductors. The detailed lay-out of these sites and roads is determined in part based on the results of the field studies.

Modifications to high-voltage substations

In addition, modifications will be made to the high-voltage substations at Lelystad, Diemen and Ens in order to make them suitable for higher transmission capacities. This requires the replacement of existing components by new ones. TenneT has commissioned field studies into ground water levels, the load-bearing capacity of the soil, and several land management aspects. This approach will minimize the risk of any problems occurring at a later stage, and will enable the area to be restored to its original condition following completion of the work.


Innovation (383 KB, PDF, 05/18/2016)

Category: Position Papers
Innovation Download Download
The Wintrack Pylon (1 MB, pdf, 04/29/2016)

An innovative solution for new high-voltage lines

Category: Brochures
The Wintrack Pylon Download Download

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Service Center

0800 836 63 88

Peggy Steenbergen

Woordvoerder project

+31 (0)6 55 23 64 57

Eefje van Gorp

Media Relations

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