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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Offshore Projects Germany

TenneT is the largest investor in the energy transition

Our Mission: Enabling Sustainable Energy Supply

The energy transition is the biggest project for the future that has ever taken place in Germany. In the future, we want to fundamentally change our energy supply: away from nuclear and fossil fuels towards renewable energies. Their share is expected to rise to to 65 percent in 2030. Offshore wind energy, generated far out at sea, is an essential building block for the energy supply of the future.

In order to achieve this ambitious goal, the German government has set concrete targets: Offshore wind turbines with a capacity of 6.5 gigawatts (GW) are to be connected to the grid by 2020. By the year 2030 it should even be 20 GW. In purely mathematical terms, this corresponds to the output of 20 conventional large-scale power plants.

By 2019, TenneT had already met and even significantly exceeded the Federal Government’s expansion targets of 6.5 GW by 2020 for sustainable North Sea wind power: the twelve completed grid connections in the North Sea already transport more than 7 gigawatts of renewable energy from sea to land. By 2027, TenneT will have completed four more offshore grid connections This will increase the transmission capacity to over 10 GW by then. Enough to supply around 12.5 million households in Germany with renewable energy. Between 2018 and 2028, TenneT will invest around 16 billion euros in the offshore grid, making it the largest investor in the energy transition.

The legal basis for offshore network expansion in Germany

TenneT has been legally obliged since December 2006 to connect all offshore wind farms in the German North Sea to the power grid. As an expert within the TenneT Group, this task is performed by TenneT Offshore. In addition to planning and design, TenneT Offshore is also responsible for the construction and subsequent operation of grid connection lines at sea to the point on land where the energy is fed into the German grid. 

From Sea to Land (4 MB, pdf, 21/04/20)


From Sea to Land Download Download

Overview grid connections Offshore





In operation

alpha ventus









BorWin3 900 2019







DolWin3 900 2018







Nordergründe 111 2017







Ʃ in operation 7,132 MW

In construction

BorWin5 900 2025




DolWin5 900 2024

Ʃ in construction

2,700 MW

To be built by 2027

BorWin6 930 2027
Ʃ to be built by 2027 930 MW
To be built by 2030
BalWin1 2,000 2029
BalWin2 2,000 2030
BalWin3 2,000 2030
Σ to be built by 2030
Ʃ 16,762 MW

State May 2020

TenneT has been implementing grid connections for offshore wind farms in the North Sea since 2006. These include BorWin1, the world's first direct current link between an offshore wind farm and the onshore power grid, which is over 200 kilometres long and has been in operation since 2015. In addition to the twelve grid connections already completed, TenneT will install four more offshore grid connections by 2027, so that more than 10 GW of offshore wind energy from the North Sea will then be available. Clean wind energy for 12,5 million households in Germany.

The following diagram provides an overview with detailed information on the individual projects.