IElectrix - shaping the future of energy systems

E.ON and mobile Battery systems. Empowering Europe’s energy transition.


  • Mobile Battery systems can support the connection and integration of new distributed renewable plants more quickly and at a lower cost.
  • DSOs are a key enabler for the development of energy communities, worldwide.
  • DSOs can help to develop a universal standard for substation ready plug-and-play battery systems.

The Challenge

Our challenge in Europe is to integrate millions of new distributed renewable assets into existing networks. These were built in the past 20-50 years with a different purpose, namely to bring power from big central plants to customers. Consequently, as a result of renewable generation connected close to or at the consumer’s premises, some systems can suffer from issues with peak load and voltage violations.

In some cases, the mitigation measures needed for these technical challenges could cost several millions of Euros and take years to be implemented, as shown in our pilot site “HELGA” in Zánka, Hungary.

On top of that, our energy system has been built on the premise that power generation always follows and matches demands. In a future energy world, with high shares of volatile renewable power, proceeding to follow this principle will lead to the unwanted curtailment of renewable generation, as shown in our pilot “moew.e” in Friedland, Germany. In order to avoid curtailment of renewable power and to guarantee that renewables can be connected to the network faster and more cost-effective, IElectrix proposes technical and commercial concepts.


integrate millions of new distributed renewable assets

into existing networks

to showcase that 100% renewable energy is possible

The Solution

We designed and installed innovative mobile Battery Energy Storage Systems (BESS) facilities that help DSOs to connect renewable energy sources faster and more efficiently. The mobile BESS mitigates the technical disruptions generated by the newly connected renewable plants.

In areas experiencing a fast transition of their energy system, mobile Storage Systems can help the region save millions of Euros. This is achieved by allowing the DSO to quickly accommodate these BESS where new requests for the connection of the renewables are being asked.

In our demonstration site in Hungary, mobile Battery Systems have proved to be up to 80% more cost-effective than the alternative conventional measure.

Complementary a Direct Load Control system is used to help steer a subset of household loads to provide grid services and to optimise consumption from renewable energy sources (RES). The technological inclusions in these demo sites, set the foundation for the creation and development of citizen energy communities. In these communities, citizens can benefit from the renewable energy generation of their local plants, leading to a higher engagement and to the possibility for them to actively contribute to a faster, more affordable and just energy transition.


Battery Energy Storage Systems (BESS)

to connect renewable energy sources faster

and more efficiently

The Results

The creation of IElectrix has set a strong foundation for a pan-European market for mobile BESS. With the involvement of Enedis and E.ON, who own and operate more than 3 million km of distribution network infrastructure, the right partners and experience have been chosen to come aboard.

In Hungary we will have developed and implemented an Energy Management System (EMS) that controls and optimises energy flows, the battery as well as flexible loads. The achieved flexibility is utilised to help integrate renewables such as PV faster and cost-efficient. Furthermore, with the Hungarian case alone the RES hosting capacity can be increased by 500kW locally.

In our moew.e pilot in Friedland (Germany) we are taking care that renewable energy from available resources is efficiently used. An algorithm will be developed that reduces curtailment of renewables. The local BESS will be able to relieve the transformer by 1000 kWh for 2hrs.

Furthermore, we will have come up with conclusions about investment deferral. The pilot will demonstrate how a mobile BESS can allow investment deferral in conventional grid infrastructure update and thus boost energy transition in specific countries.

Finally, we will have upgraded the old legacy system to a demand response (DR) system, which allows an optimized and more active control of the DR assets and flexible loads.

Not every country will be able to invest tens of billions per year into the energy transition. Cost efficient infrastructure reinforcement will thus be essential. IElectrix is a project in which we will prove how to operate our networks digitally much smarter resulting in lower cost for consumers.

Dr.-Ing. Leonhard Birnbaum, Chief Operating Officer – Integration

Hungarian demo-sites: HELGA – Hungarian Energy Storage: Local Communities for Global Advantage

In Hungary – as in many parts of Eastern Europe – the expansion of renewable energies is slowed down, because new renewable plants, requesting to be connected to the grid, exceed the currently available connection capacities. As grid reinforcement needs time, the aim of the two demo-sites in Hungary is to provide battery energy storages as an interim solution which allows for fast and affordable installation of new PV farms already today. The mobile storage systems will lead to significant cost savings as the solar panels can be connected to the grid at the closest connection point. This way costly and time-consuming work that would be needed to connect at a more distant point which has available capacities, is avoided. By combining the storage solution with active energy management and smart metering systems in residential houses E.ON Innovation is also planning to enable the development of new energy communities.

German demo-site: moew.e – Mobile Energy with E.DIS

The first mobile storage system of the IElectrix project is located in Friedland Germany, in the network area of E.ON´s subsidiary E.DIS. In the small town twice as much renewable energy is generated as is consumed. Due to limited grid capacities this surplus of renewable power cannot be fed in which frequently results in curtailment. To integrate wind power and photovoltaic systems into the networks in an automated and efficient manner, intelligent algorithms take over the independent and active communication between the energy storage system and the large transformer in the substation. When the transformer has reached its capacity limit, an algorithm sends a signal to the storage system to start storing energy. And vice versa it makes the green power locally available again, when demanded – for instance in the evening when the production of renewable energy is low, but consumption is high. Moreover the intelligent system helps to balance peak loads, thus increasing grid stability.