Actemium Germany has developed a unique solution for connecting renewable energy production systems to the power supply network – a standardised 4.6 MVA mobile energy container. This flexible, modular solution is highly adaptable to the specific needs of different energy projects, making it a key asset for accelerating energy transition.
©Actemium Germany
What is the best way to connect renewable energy production (wind, solar, hydrogen electrolysis or even battery storage) systems to the public power supply network quickly, easily, inexpensively and safely? Actemium Germany has answered that question with the benefit of huge internal support, including from its Kassel unit. Drawing inspiration from an idea floated in late 2022, Actemium launched the development of its own distribution network connection solution.
A year later, it trialled a prototype of its standardised 4.6 MVA energy container (MVA – Megavolt-Ampere – is the measurement unit of apparent power). Then in May 2024, three of these power containers were sold to BLG, a company specialising in the installation and maintenance of solar farms, as part of its BLG Puttkammer project. Commissioning of this facility and its connection to the Westfalen Wesern energy distribution network, which operates in the East Westphalia‑Lippe and Weserbergland regions, took place in July 2024.
In May 2025, another energy container was integrated into the existing medium-voltage grid at an industrial customer’s site, thereby helping to maximize the self-consumption of self-generated renewable energy sources.
Easy and inexpensive to install
The solution is equally well suited to small-scale production facilities, where it can be used to transform low-voltage electricity such as that generated by a solar installation into medium-voltage electricity. The energy can then be temporarily stored in a battery storage or transmitted directly to the nearest substation. From there, it is injected into the 110 kV network. The storage batteries and electrolysers for producing hydrogen can also be connected directly to a substation via the energy container.
“The energy container can be transported quickly and easily to any location”
Martin Koch, Head of Infrastructure Projects at the Kassel BU, explains: “Thanks to its compact dimensions (6 m) and modest 14-tonne weight, this energy container designed for low and medium voltages and transformers can be transported quickly and easily for installation in any location. Its containerised design and its prefabrication also shorten the construction phase considerably.”
A secure and sustainable solution
On 2 July 2024, this innovative solution underwent successful compliance testing for the IEC 62271‑202 A and B standards. The standardised energy container is fully compliant with the regulations governing protection for operators and passers-by against electrical arcing, a level of safety hitherto never achieved in container solutions. Because of this, the system requires no other enclosure.
Its environmental compatibility and sustainability are additional advantages. The medium-voltage switchgear – designed with zero SF6 (which is a greenhouse gas) – and the power transformer are filled with environmentally friendly bio-oil. In addition, an oil collection vessel with anti-splash protection and certified oil filtration system ensure that no oil is ever discharged into the environment.
Actemium’s standardised energy container can therefore ensure an energy supply compliant with Germany’s EEG Law on renewable energies, which imposes certain obligations on electricity supply companies. Initially introduced in 2000, this law governs the development of electricity produced in Germany from renewable sources such as wind and solar. The aim is to accelerate expansion in these energies and help reduce CO2 emissions. It includes fixed feed-in tariffs and market premiums for producers, and promotes cost-effective development through calls for tender.
One model, several versions
Designed without forced ventilation for the transformer, the standard version of this solution developed by Actemium makes it possible to connect a solar farm, depending on the voltage, of up to 30 MVA using medium-voltage 630 A switchgears and with several energy containers connected in series. This flexible, modular solution is highly adaptable to the specific needs of different energy projects.
Actemium has developed several different versions of energy containers tailored to the varied configurations found in different energy production facilities. The standardised versions available include a 10, 20 or 30 kV container for transfer from energy production plants containing up to five medium-voltage switchgear panels.
Actemium also offers a 10 or 20 kV transfer container that contains up to three medium-voltage switchgear panels and a 10 or 20 kV metering panel for direct connection to the power supply network.
In spring 2025, Actemium’s new container concept was officially presented to its customers at EM‑Power Europe 2025 in Munich, Germany – the world’s largest solar industry conference. The event will be an opportunity for Actemium to demonstrate the extent of its expertise and its connectivity solutions for solar farms, while consolidating its position in the international solar energy market.
With its diverse range of modular containers, Actemium is effectively offering a solution perfectly tailored to the needs of a constantly evolving industry, where flexibility and efficiency are essential criteria for any successful large-scale energy project.
12/15/2025
