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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The increasing amount of renewable energy fed into the grid in Schleswig-Holstein has made it necessary to expand the existing grid structure. The district of Schleswig-Flensburg numbers among the regions of the country that produces the most wind energy. The existing high-voltage line here has long since reached its load limit. In the Power Grid Expansion Act (EnLAG), the Bundestag called for the 380 kV grid expansion from Dollern in Lower Saxony to Kassö in Denmark already in 2009. The existing 220 kV overhead line must therefore be replaced by a higher-capacity 380 kV overhead line. The Audorf-Flensburg project represents a portion of the grid expansion between Lower Saxony and Denmark. TenneT is also realizing grid expansion projects between Hamburg/Nord and Dollern and between Audorf and Hamburg/Nord, which together constitute the entire central axis measures. These lines will be critical in the future for the success of the energy transition and contribute to the associated transport of renewable energies into southern Germany.

About the project

The planned Wahle-Mecklar extra high voltage line should connect the transformer substation in Wahle bei Braunschweig in Lower Saxony with the Mecklar bei Ludwigsau transformer substation in Hesse at a voltage of 380 kilovolt (kV). The roughly 230 kilometre long line will significantly increase the capacity of the transmission grid, making a critical contribution to the security of supply and grid stability in Germany. The transformer substations are important energy nodes along the planned Wahle-Mecklar high-voltage route. The lines of the various voltage levels intersect and are connected together at these transformer substations. This is where, for example, the electricity from the transmission grid is transformed for the next lower voltage level of the subordinate distribution grid and carried farther into the regions to the consumers. Conversely, renewable energy from the regions is received from the regions via transformer substations, transformed and transported into the high-voltage grid.

More information

See the

German language page

for detailed information on Wahle-Mecklar

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