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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News Congestie

TenneT expects structural congestion, as referred to in Article 9.5 of the Electricity Grid Code, in the 150kV grid in Flevoland and Gelderland during the period 2021-2029

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The expected congestion is caused by the rapid growth of solar and wind production in the grid of the regional grid operator (Liander) and in TenneT's grid. The resulting higher transport demand cannot be fully facilitated due to the limited available transport capacity in the high-voltage grid. 

What is the contracted and available transmission capacity?

The congestion area covers all 150kV-stations in the province of Flevoland (Flevopolder) and all 150kV-stations in Gelderland. In this congestion area, the total contracted transmission capacity is approximately 5,600 MW. The total available transmission capacity (stations Lelystad, Dodewaard, Doetinchem) amounts to approximately 3350 MW. This capacity is fully allocated in signed tenders for contracted transmission capacity. There are no restrictions with regard to consumption; only with regard to feed-in.

Planning the grid reinforcement

The structural solution consists of splitting the meshed 150kV Flevoland-Gelderland-Utrecht grid into at least four grid sections, each with its own connection to the 380kV grid, increasing the 150/380kV transformation capacity and possibly upgrading 150kV connections. The increase in transformation capacity will be completed in phases during the period 2026-2029.


TenneT is to start a study into the possibilities for applying congestion management in the area mentioned in Article 9.5(5) of the Electricity Grid Code. After its completion, the study will be published on TenneT's website.


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