The smart grid project InterFlex has been selected from 28 other candidates to be  part of the largest EU Research and Innovation program, Horizon 2020.

For three years, 20 European project partners will explore new forms of flexibility in the energy market, with the aim of optimizing electrical energy systems at local level.


Interflex is a subsidized project of the European Commission that is part of the Horizon 2020 innovation program. This program aims to stimulate economic growth and create smart and sustainable jobs. The goal of Interflex is to develop the next generation of smart electricity networks and thus accelerate the energy transition. Five network operators from five different countries are participating in this three year project..

The Enexis Group is leading the project Interflex in the Netherlands and works in close cooperation with project partners  ElaadNL and TNO, and various other parties like the municipality of Eindhoven. Moreover Enexis is also keeping close contact with the parties that are the pioneers of the program in other countries such as: Avacon (Germany), E.on (Sweden), Enedis (France) and CEZ Distribuce (Czech Republic).​

Glossary Smart Grid termen


The InterFlex project in the Netherlands is being carried out at Strijp-S, a neighborhood in Eindhoven. This is a sub-project of the European InterFlex project, which is led by Enexis. The focus of the Dutch pilot lies mainly on flexibility from battery storage and electric vehicles charging in combination with a trade system based on flexibility of energy flows. The project is carried out by Enexis, Elaad, TNO and subcontractors Jedlix, Sympower and Croonwolter & Dros.



Use Cases



The purpose of this demonstration is to test technically, economically and contractually whether the smart storage can be used in the form of a commercial storage. The value of centralized storage must be made clear and used optimally by the help of all stakeholders involved: the national network operator, local grid operator, storage manager, prosumers. It demonstrates the applicability of having storage units on a large scale at substations or at street level, in order to control energy demand. The capacity of the central storage unit used is around 310 kWh.

To make interaction among the actors, markets and local sources possible, a "Local Infrastructure Management System" LIMS is created. The goal is to enable a local actor to accommodate and unlock the potential of various flexible energy sources.

This use case enables optimal activation of all available local flexibility offered by the locally available charging stations for congestion management of the electricity network.

The charge point operator (CPO) manages the charging of the electric vehicle by applying different means to free up the potential of the flexibility in electric vehicle. It can aggregate the flexibility and offer it to e.g. the national or local grid operator via a "flexibility aggregator platform" (FAP). This use case conceptualizes, implements and validates the technical aspects of "long term flex purchasing contracts" to facilitate the flexibility needs of the local grid operator. The rest of the flexibility / capacity can be exploited by aggregators and by program responsible parties (BRP) and the national grid operator. This increased local flexibility makes it possible for a large group of consumers to actively offer their flexibility to the energy markets. The local grid operator will communicate with "flexibility aggregator platforms" (FAPs), by requesting flexibility offers to different commercial parties, for the next day (day ahead). This is most likely the situation when it comes to congestion. However, also business models could emerge where program managers (BRPs) and / or the national grid operator take a role too.


This demonstration technically, economically and contractually validates the usability of an integrated flexible energy market based on a combination of static battery storage (Smart Storage unit) and the charging of electric vehicles. One of the aggregators manages the storage and another manages electric vehicles charging stations. The aggregators compete at the flexibility market, both offering flexibility to the various stakeholders (such as grid operators). The two types of flexibility (storage and electric vehicle charging) have different characteristics and most likely different user restrictions (e.g. drivers of electric cars want to have their cars recharged within a certain time). This results in different marginal costs of flexibility and therefore more dynamic earnings and more competition. In this use case, a market mechanism is used to trade flexibility between the aggregators and the grid operator. It is based on financial compensation for flexibility. To prevent predicted congestion in the grid, the network management system purchases the required flexibility from one of the aggregators, based on the price of the flexibility. This results in the most cost efficient solution for the local grid operator.


One of the most important ambitions of this project is scalability. It is because of this reason we focus as much as possible on using existing, open protocols for the different systems to work together. We use the protocols and standards: OCPP1.6, OCPI, EFI and USEF. Some adjustments/improvements will be required for some of the protocols. We then incorporate these adjustments as proposals for improvement for the further development of OCPI, EFI and USEF.



An architecture is built for testing the smart grid on the basis of different roles and functions in the system. The roles are:​

  • Local energy network operator who manages the local grid and can use the Grid Management System (GMS) to predict whether congestions will occur in the near future. In that case, the GMS will ask the aggregators active on the local market for energy flexibility, and  compensate them for lost income from other markets.

  • Flexible Aggregator Platform (FAP). These are commercial aggregators who can offer flexibility in energy demand in exchange of money as compensation. They do this by controlling the Distributed Energy Resources (DERs) such as the electric cars and the battery via:

  • Local Infrastructure Management System (LIMS), which can control solar panels, electrical charging, storage via batteries.

Charge Point Management System (CPMS) manages smart charging and discharging of electric vehicles.

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