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 23,000 kilometres of high-voltage lines, we cross borders and connect countries.

Explore our grid

Grid maps

Maps of our onshore and offshore high-voltage grid.

To grid maps
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 41 million people.

Explore our company

We are TenneT

Meet us
News News

DNV-GL compares costs of offshore connection systems

Downloads & Contact

In most European countries where offshore wind farms are constructed, the national grid operator, the TSO (Transmission System Operator), is responsible for the construction and operation of grid connections for offshore wind farms. This is the case in the Netherlands and Germany (TenneT), but also, for example, in Denmark (Energinet), Belgium (Elia) and France (RTE).

The situation is different in the United Kingdom (UK). The wind farm developers are also responsible for the construction of the grid connection there. When the offshore grid connection is ready, they sell it to commercial investors and a so-called OFTO is formed; the Offshore Transmission Owner.

Which model, the TSO model or the OFTO model, ensures the lowest costs for electricity consumers, i.e. for society? DNV-GL mapped this out. Main conclusions by DNV-GL: In the OFTO system (UK), the costs of developing offshore connections (CAPEX) are significantly higher than in the Netherlands and Denmark.
Furthermore, DNV-GL's report shows that the LCOE1 (Levelized Cost of Energy) of the Dutch and Danish offshore connections is quite a bit lower.
You can download DNV-GL's presentation with results here.

Next week, Navigant will present a further analysis. The analysis also highlights other than financial-economic benefits of the TSO model. Think of the coordination when it comes to integrating offshore wind energy into the onshore grid and the responsibility during the operational lifetime.

[1]LCOE is an economic assessment of the average total cost of constructing and operating an asset during its lifetime, divided by the total energy production/transport of the asset during that lifetime.

Do you want to know more?

Jeroen Brouwers

Media Relations

+31 (0)26 373 26 00

Do you want to stay informed?

Like the

facebook page

Go to Facebook page