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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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.

Inspections and preventive maintenance

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. Our experience over the years has shown what we should do to keep our network in a good condition and how we can keep the maintenance costs affordable, without taking irresponsible risks.

This includes: 

  • Carrying out fewer but targeted inspections
  • Doing less preventive maintenance work in general, but more where necessary
  • Replacing equipment if that is the most efficient option

Fewer, but more focused inspections and replacements

Inspections help us to spot potential problems before failures occur. However, the equipment parts that could potentially be at risk are not always visible. That’s why we target our inspections, which also means we don’t have to conduct as many.

Much of the high-voltage network was built in the 1960s and is approaching the end of its expected technical life. We therefore keep a close eye on the older equipment and replace it as necessary.

In the event of a large disruption, we investigate whether it is better to replace the faulty equipment or repair it. Sometimes repairs can be more expensive or the new equipment is superior. We also look out for trends in faults so that we can take action to prevent larger problems.


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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Grid expansion

To be able to transmit all the electricity generated by these  new power plants, TenneT is carrying out a large-scale expansion programme.

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