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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News Corporate Market

TenneT provides free access to valuation tool for large-scale electricity storage

Downloads & Contact
  • Free Electricity Storage Valuation tool provides companies with insight into business case for large-scale electricity storage
  • Flexibility in storage methods is a precondition for a sustainable electricity system 


Flexibility in the electricity system is essential. Grid operators require flexibility to maintain the balance between supply and demand on the high-voltage grid, while market parties need it to accommodate fluctuations in electricity production. The demand for flexibility is growing as the share of renewable sources in the overall electricity supply increases and electrification occurs in many sectors.

Flexibility Roadmap 

In its Flexibility Roadmap, TenneT has already outlined a vision on the role of flexibility in the future electricity system of the Netherlands. The Roadmap provides an overview of various flexibility solutions, including energy storage. 

TenneT has now developed a tool to further facilitate the understanding of key drivers and sensitivities in business cases for large-scale electricity storage.

Free tool

TenneT’s free tool allows users to independently analyse business cases for large-scale electricity storage. The tool uses a powerful method to determine the optimal dispatch of storage assets for specific applications, and includes a comprehensive set of technical and economic parameters for large-scale storage projects. It can also be used to perform financial analyses. Users can select one of the predefined example cases, or define their own projects.

TenneT commissioned consultancy firm Ecofys to develop the tool, and Ecofys also elaborated a number of example cases. These models cover the following technologies:

  • Lithium-ion battery technology
  • Redox flow battery technology
  • Compressed Air Energy Storage (CAES)
  • Electrolysis for sustainable hydrogen production 

The example cases also devote attention to possible market segments in which storage assets can be used, such as ancillary services related to Frequency Containment Reserves (FCR) and automatic Frequency Restoration Reserves (aFRR), as well as the day-ahead market. The tool also includes historic price series for these market segments.

Users of the tool are provided with a comprehensive overview of results, including the Internal Rate of Return (IRR) and a breakdown of the Net Present Value (NPV) at project level, as well as energy cycles, energy throughput, and detailed annual cash flow results.

Downloading and using the tool

TenneT invites anyone to download the tool from the TenneT website and use it for themselves. We will also be present at the Energy Storage Day held on 10 October in Den Bosch, the Netherlands, to present the Electricity Storage Valuation tool and our vision on flexibility in the electricity system.

Do you want to know more?

Franscé Verdeuzeldonk

Media Relations

+31 (0)26 373 26 00

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