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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Security of supply

A secure and continuous supply of electricity is the key objective of our operations.

A reliable power supply

The power grid is stable when the electricity that is generated corresponds with the electricity that is consumed. The grid operator is responsible for maintaining the balance. Because electricity producers cannot know exactly how much electricity will be consumed, TenneT must make up the difference with its own energy reserves.  In the Netherlands TenneT is the sole grid operater, in Germany we therefore cooperate closely with the other German TSOs to limit the need for this control power. When we do have to buy electricity we do so on the market in a transparent and non-discriminatory manner. We announce how much power we require on the online balancing power market (www.regelleistung.net), where producers can offer capacity and customers can see the tenders.

About the electricity grid

The high-voltage grid is the backbone of the electricity supply system, connecting electricity producers to consumers, connecting and integrating electricity markets. TenneT manages the high-voltage grid in the Netherlands and large parts of Germany. A secure and continuous supply of electricity is the key objective of our operations. 

50 Hertz: a delicate balance

The entire European power grid depends on a 50 Hertz frequency for the use of all equipment, devices, machines and electrical systems. The European Network of Transmission System Operators for Electricity (ENTSO-E) comprises five synchronous areas, of which the largest is continental Europe – which includes the Netherlands. If the frequency differs significantly within one of these areas – either upwards or downwards – it will lead to power failures and even blackouts with a total loss of power.

TenneT continuously monitors the quality and capacity of the high-voltage grid. Disruptions to the grid must be prevented at all times. To guarantee a continuous flow of electricity, supply and demand have to be balanced 24 hours a day, seven days per week. In areas of high electricity consumption or supply, the grid must have sufficient transmission capacity. An increase in capacity can be achieved by transmitting electricity at higher voltages, or by connections with a higher capacity.

Storing electricity is complicated, especially large-scale storage. To offset fluctuations in supply and demand, TenneT uses tools such as regulating capacity, reserve capacity and emergency capacity.

It is the responsibility of the TSOs to monitor the balance between production and consumption on an international level. Therefore we work with our European counterparts to compensate for electricity surpluses and shortages across national borders.

Grid Code

There are clear rules and procedures in place to ensure the security of the electricity supply. These provide clarity on the tasks and responsibilities of all the parties involved in the transmission of electricity. They define each party’s role, ensure effective communication between all parties, provide transparent tariffs and enable the electricity market to operate freely.

As the network operator, we determine the minimum technical requirements for connecting to our onshore grid, as stipulated in the Energy Act. The minimum requirements for connecting to the onshore grid are set out in the extra-high voltage grid code, while the ‘requirements for offshore grid connections in TenneT’s network’ apply to offshore installations in the North Sea.

Visit the Dutch Grid code


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Visit the German Grid code

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Transport services

TenneT transports electricity along the high-voltage grid from where it is produced to where it is consumed.

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Market facilitation

Our goal is to establish a single market that guarantees consumers a reliable electricity supply at a fair price.

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System services

System services are the services TenneT provides to guarantee the flow of electricity in the Netherlands and large parts of Germany.

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