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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Scheduled maintenance

We only carry out maintenance work when the availability of the transmission grid permits this. We therefore have a coordinated plan for carrying out preventive maintenance work.

Redundancy and ring structure

The high-voltage transmission grid is designed so that parts of the network can be switched off for scheduled maintenance without impacting the electricity supply for our users. Certain grid components are serviced in this way every week .

Our transmission system has redundancy built in. This means the critical components are duplicated: there are two circuits for each high-voltage connection and extra transformers in the high-voltage substations. This redundancy allows us to continue transmitting electricity while we are doing maintenance work. 

In addition, the grid is structured in a ring shape. If there is a disruption somewhere, we can reroute the electricity along an alternative path. 

Planning maintenance

We only carry out maintenance work when the availability of the transmission grid permits this. We therefore have a coordinated plan for carrying out preventive maintenance work, so we are sure the system can also cope with any unscheduled disruptions during the planned service outages. We determine beforehand whether it is safe to proceed with the scheduled maintenance. 

Work safety

The safety of our employees during maintenance work is paramount. That is why it takes several people to shut down parts of the high-voltage grid and everyone involved has to follow strict procedures and wear protective clothing.


Maintenance strategy

The upkeep of the high voltage network is one of TenneT’s most important tasks. It reduces the risk of disruptions and ensures the security of the electricity supply.

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Our infrastructure

The infrastructure that TenneT manages makes it possible to transport electricity via high-voltage power lines and substations, in almost all weather conditions.

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TenneT is aware of its responsibility for the living environment of people, animals and plants. We want to reduce the impact of our activities and our high-voltage grid on the surrounding area as much as possible.

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