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 over 22,000 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 high-voltage grid

The high-voltage grid is the backbone of the electricity supply system, connecting electricity producers to consumers, connecting and integrating electricity markets.

Germany and the Netherlands

TenneT transmits electricity at 110,000 volts (110 kV) and higher. In Germany, the operators of the high-voltage grids, i.e. the 220 and 380 kV grids, are designated as Transmission System Operators. Our high-voltage grid has a frequency of 50 Hz, in line with European standards. It is our task to maintain this level at all times and ensure supply and demand are in balance.

TenneT transmits electricity directly from the source to regional distributors, which in turn supply power to consumers. We also supply directly to large customers. We connect the high-voltage grid and the distribution grids at high-voltage substations or switching substations. At these ‘nodes’, transformers convert the high voltage to low voltage, suitable for use by households, businesses and organisations.

Sources of electricity

This electricity flowing through our grid is generated from various sources, including fossil fuels (natural gas, coal, lignite, oil), renewable sources (wind, solar, biomass, geothermal) and nuclear energy. In Germany, TenneT transports the biggest share of green energy of Germany. Electricity can also be produced in combined heat and power (CHP) plants. The heat released in the plant can be reused to heat rooms or to generate electricity, which may be supplied back to the grid.

Grid map

High-voltage grid

Our grid map shows our high-voltage grid, substations and interconnectors in the Netherlands and Germany.

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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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Transport services

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

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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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