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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News News Project

Hollandse Kust (zuid) Alpha topside installed at the North Sea

The offshore transformer station of the Hollandse Kust (zuid) Alpha platform is successfully installed on the jacket in the North Sea, about 20 kilometers off the coast of The Hague, on Sunday December 26th 2021. The transformer station, also called topside, is one of the two topsides of the Hollandse Kust (zuid) offshore grid, which will connect the offshore wind farm area with the same name to the Dutch onshore high-voltage grid. 

Marco Kuijpers, Director of Large Projects Offshore: "With the installation of the Alpha topside, the offshore grid that TenneT is building in the North Sea is starting to take shape. Hollandse Kust (zuid) Alpha is the first connection of an offshore wind farm to the Maasvlakte, with a capacity of 700 MW. Wind energy plays a crucial role in the energy transition, also in industry, and I am proud that TenneT can contribute to a sustainable future in this way."

From Dubai to the North Sea

Over the past year, contractor Petrofac has been working on the fabrication of two High Voltage Alternating Current (HVAC) transformer stations Alpha and Beta at the Drydocks World fabrication yard in Dubai. Mid-November, Mammoet, a specialist in heavy transport and lifting, took care of the weighing and loading of the 3,830-tonne Alpha topside onto the transport vessel Tai An Kou. From Dubai, the Tai An Kou sailed in one month to the Alexiahaven on the Maasvlakte, where it arrived on Tuesday December 21st. 

Offshore company Allseas carried out the installation

In the Alexiahaven, the Alpha topside was loaded from the transport vessel onto the multipurpose platform installation and removal vessel Pioneering Spirit of offshore company Allseas, which then sailed to the installation location in the North Sea. After completion of preparatory work, Pioneering Spirit accurately positioned the Alpha topside on the substructure, also known as jacket.

"It is great to be involved in an energy project of such strategic importance to the Netherlands," said Edward Heerema, President and CEO of Allseas. "Pioneering Spirit has made a name for itself in recent years with pioneering lifts in the oil and gas industry. The successful installation of the Alpha topside demonstrates the versatility of the vessel and our added value in the energy transition."


Significant milestone in the delivery of this important energy transition project

Sami Iskander, Petrofac Group Chief Executive, adds: “The safe installation of the Alpha topside is a significant milestone in the delivery of this important energy transition project. Everyone involved should be proud of this achievement. Petrofac has been building a successful track record in offshore wind for more than a decade now, which reflects the capability of our engineers and the quality of our delivery. We are collaborating closely with our partners on the upcoming delivery of the Beta topside and successful grid connection.”

The Beta topside - also with a capacity of 700 MW - is expected to follow in the first quarter of next year. When the wind farm area Hollandse Kust (zuid), developed by wind farm developer Vattenfall, is fully operational in 2023, it will generate an amount of renewably energy that is equivalent to the annual consumption of more than two million households. Hollandse Kust (zuid) is the first subsidy-free wind farm area in the world.

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