SMA Altenso Commissions Its First In-House Developed Large-Scale Energy Storage System For MEAG In North Rhine-Westphalia

SMA Altenso has marked a major milestone in Germany’s fast-expanding storage sector with the successful commissioning of its first internally developed, large-scale battery energy storage system for Munich-based asset manager MEAG. The installation, located in Metelen in North Rhine-Westphalia, is now fully operational and ranks among the country’s largest battery storage facilities.

With this achievement, Altenso strengthens its position in the international battery-storage market, having already implemented 2 GW of storage capacity and advancing a development pipeline exceeding 4.5 GW. The new Battery Park Metelen delivers 92.5 MW of power and 231 MWh of capacity, providing critical balancing services that support frequency regulation and grid stability.Serving as the engineering, procurement and construction contractor, Altenso delivered the entire split-site system, including medium-voltage infrastructure and advanced inverter technology.

The facility features a 110 kV substation equipped with a 100-ton high-voltage transformer, 31 Medium Voltage Power Stations fitted with SMA Sunny Central Storage UP inverters, and 62 battery platforms using lithium iron phosphate technology. A newly constructed 600-meter power link connects the substation with the battery park site. Through SMA’s sophisticated control systems, the installation participates across multiple electricity markets, including day-ahead and intraday trading, while also supporting ancillary services that help maintain system reliability.

Altenso has now formally transferred ownership of the Battery Park Metelen to MEAG, with the investor assuming responsibility for the long-term operation of the asset. Despite the handover, Altenso will remain closely involved, taking charge of operations and maintenance activities to ensure dependable performance throughout the system’s lifecycle. According to Wiebke Krüger, Head of Operations at SMA Altenso, the project represents both technological progress and a clear commitment to shaping future-oriented energy solutions.

She emphasized that large-scale battery systems like Metelen enable the efficient integration of renewable energy into the grid and provide essential stability services, while expressing appreciation for MEAG’s partnership in advancing the energy transition.Beyond its technical specifications, the Metelen storage system illustrates the broader strategic importance of battery assets in modern electricity networks. By offering rapid response capabilities and flexible energy delivery, such systems play a key role in supporting renewable integration and managing fluctuations in power generation.

The facility’s storage capacity of 231 MWh would theoretically be sufficient to supply the equivalent electricity needs of approximately 140,000 households for four hours, underscoring the scale and real-world impact of the installation.The collaboration between Altenso and MEAG is continuing to expand. At a second site in Hoexter, also in North Rhine-Westphalia, Altenso is constructing another utility-scale storage facility for the investor.

This project will provide 130 MW of power and 354 MWh of capacity and will incorporate SMA’s next-generation SiC MOSFET inverter technology. It will also include the development of two high-voltage grid connections, enabling the deployment of two identical yet fully independent storage systems. The Hoexter project reflects the partners’ long-term commitment to accelerating the rollout of flexible, high-performing battery infrastructure across Germany.