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).

Explore our key tasks


TenneT presents Hub and Spoke concept for large scale wind energy on the North Sea.

Read more
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.

Explore our grid

Offshore Outlook 2050

Already by 2030, the originally planned capacity of 15 gigawatts of offshore wind energy will increase to 20 GW.

To Offshore Outlook 2050
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.

Explore the electricity market

Transparency data

We provide transparency data on our operations on our Dutch and German transparency page and on ENTSO-E. 

To transparency pages

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.

Read more

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.

Explore our company

We are TenneT

Meet us

alpha ventus

Departure into the age of offshore wind energy



  • 66 km long and 62 MW capacity
  • 6 km onshore cable
  • 60 km offshore cable

Grid connection point

  • substation Hagermarsch (110 kV)

Status of project

  • in operation since May 2009

About the project

In May 2009, TenneT realised the first grid connection at sea in Germany with alpha ventus. This grid connection marks the beginning of the era of offshore wind energy, because with alpha ventus, energy generated at sea could be fed into the German power grid for the first time. The "alpha ventus" wind farm of the same name was established as a test field around 45 kilometres off the coast of Borkum in 2006 to test and research the generation of wind energy at sea.
Due to its proximity to the mainland and its low output of 62 megawatts (MW), alpha ventus was connected to the transmission grid using three-phase current technology. The 66 kilometre cable runs from the sea via the island of Norderney ashore and from there to the Hagermarsch transformer station. There, 110 kilovolts of the energy generated at sea is fed into the power grid. 

Tim Dampmann

Spokesperson - Projekt Offshore Communication