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

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Grid maps

Maps of our onshore and offshore high-voltage grid.

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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 41 million people.

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We are TenneT

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Overview of market processes

Challenges of the BKV with regard to the BIKO: Participation of the balancing group manager

In the framework of the DSO’s balancing group totals received by the BIKO, the entities responsible for the balancing groups (BKVs) now also obtain, due to the introduction of MaBiS, the obligation to cooperate and the right to object. These are possible, but only to the extent stipulated in MaBiS, and at defined intervals.

Background of the considerations from the perspective of the BNetzA

“…To date, the billing system provided, in the transmission and inclusion of balancing group time series totals, that the DSO should have unlimited opportunity, up to the 29th working day after the delivery month, to unilaterally alter the content of the balancing group time series totals by additional correction reports to the BIKO. This was constantly criticized by those cooperating in the balancing group because, under these framework conditions, situations might still occur in which, shortly before the data stop deadline of the 29th working day, the DSO could make new corrections to balancing group time series totals and the BKV would no longer have time before issuing the balancing group invoice on the basis of this data to examine the data or to object to it. For after the expiration of the 29th working day after the delivery month, there is an absolute stop of data transmission for all participants because the time period from the 29th working day to the 42nd working day is reserved exclusively for the preparation of the balancing group invoice by the BIKO. This results in a unilateral shift of considerable economic risks to the balancing group manager (BKV). Especially in the case of any future conceivable shortfall of the corrected balancing group invoice, this would lead to a case in which data errors that had found their way into the balancing group invoice in the above manner would have to be eliminated and financially settled by the BKV following billing in a decentralized and laborious clearing process involving the DSO and other BKVs...”

Source: German Federal Network Agency, MaBiS resolution of 10-06-2009, Chapter V, Section 3 or Annex 1, Transmission of the BK Time Series Totals by DSOs to the BIKO, Forwarding by the BIKO to the BKV and Review by the BKV.

The illustration shows corresponding exchange processes.

More information

concerning market processes between the BIKO TenneT and the market role of DSO are availabe on the following pages:

Balancing group contract

Balancing group billing