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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Navigant also compares offshore connection systems

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In most European countries where offshore wind farms are constructed, the national Transmission System Operator, the TSO, is responsible for the construction and operation of grid connections for offshore wind farms. This is the case in the Netherlands and Germany (TenneT), but also, for example, in Denmark (Energinet), Belgium (Elia) and France (RTE).

The situation is different in the United Kingdom (UK). There, the wind farm developers are also responsible for the construction ('developer build') of the grid connection. When the offshore grid connection is ready, they sell it to commercial investors and a so-called OFTO is formed; an Offshore Transmission Owner.

On 1 July, Navigant published a study (commissioned by TenneT and the French TSO RTE) comparing the 'TSO Build' and 'Developer Build' models. Which model, the TSO model or the 'Developer Build' model, ensures the lowest costs for electricity consumers, i.e. for society? And which model offers the most qualitative benefits?

The TSO model is favourably presented in the Navigant study. In addition to lower social costs, the TSO model also offers advantages in terms of system integration, security of supply and ecological impact. Think of the coordination when it comes to integrating offshore wind energy into the onshore grid, the responsibility during the operational lifetime and the lowest possible impact on nature during the construction of the offshore grid.

These findings are in line with the report published by DNV-GL on 24 June. This study maps out the costs of grid connections. DNV-GL's main conclusions are that the costs of developing offshore connections (CAPEX) in the OFTO ('developed build') system (UK) are considerably higher than in the Netherlands and Denmark. In its report, DNV-GL also shows that the LCOE1 (Levelized Cost of Energy) of the Dutch and Danish offshore connection systems is lower.

1] LCOE is an economic assessment of the average total cost of constructing and operating an asset during its lifetime, divided by the total energy production/transport of the asset during that lifetime.


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Jeroen Brouwers

Media Relations

+31 (0)26 373 26 00

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