Upside Group develops, builds and operates energy storage systems in its own portfolio.

We are currently the largest privately owned supplier of energy storage systems for the marketing of primary control power in Germany. Further projects with an output of more than 100MW are currently under development and construction.

The systems presented here are exemplary for the efficiency of such large energy storage systems as a provider of ancillary services.



Langenreichenbach 16.4MW/25MWh

With more than 3 years of experience in providing primary control power, the Upside Group has developed an innovative technical battery concept and successfully implemented it for the first time in the Langenreichenbach project. For this purpose, operating data could be used and evaluated that relate both the state of the transmission and distribution networks and the activity and load of the storage facility at every moment of recording. This enabled components to be selected and precisely dimensioned for future-proof use in the battery system. The result is a battery energy storage system with exceptional performance at a competitive price. The interaction of power components and battery cells is ensured by the superordinated and customized EMS (energy management system). This provides optimum support for the battery management, which is particularly important for the life of the battery. With this product Upside Group is investing intensively in the expansion of the German storage infrastructure and implemented this project as a model for at least 4 further identical projects between March and June 2018.

The Central German region in the Leipzig lowland plain has a long tradition in energy production. In addition to lignite, in particular sun and wind are used to generate electricity. However, the existing power lines are already heavily used today and will be even more so in the future. Upside developed the Langenreichenbach project during 2017 in the 20kV distribution grid of a 110kV substation of the distribution grid operator MitNetz in the district of Mockrehna (Saxony). The open space created by the dismantling of an old switch house in 2015/16 was used to integrate the battery into the medium voltage of the transformer station via two separate grid connection points so that it is ready for operation 24/7. The connection, at the heart of the distribution network as it were, enables not only integration into the standard service network for the power output of the PRL, but also the direct provision of further network services. The Langenreichenbach battery energy storage system thus contributes to grid relief in the entire region.

With the frequency-controlled power output of the PRL, it is important to follow the fluctuating frequency to the second. The Langenreichenbach battery system does this in two medium-voltage rings at two separate network connection points in parallel and independently in 9 inverters with 1.8MVA each, each equipped with its own frequency control. The plant has been fully operational since July 2018 and is currently prequalified for the provision of primary control power (PRL). After completion of the prequalification phase, the large storage facility will be operated in an SPV founded by the Upside Group and the cell supplier Narada.

After evaluating various storage technologies, the Langenreichenbach battery energy storage system relies on proven technologies from renowned manufacturers. The power electronics and the converters come from Siemens and SMA, the world market leader in the field of solar inverters. The battery cells used are lead-carbon dry accumulators in which the electrolyte is bound in a fleece of glass fibre. Connected to a firmly welded ABS plastic housing with outgassing valve, the battery cells can therefore be installed horizontally and even flooded without any substances escaping. The oversizing of the electrical and chemical components typical of Upside Group projects and the low fire load inherent in the technology make the Langenreichenbach battery energy storage one of the safest and most reliable systems worldwide. Apart from this, it is one of the largest battery storage system installed in Europe.

Bennewitz 16.4MW/25MWh

With the good experiences in the context of implementation and operation of the storage facility in Langenreichenbach, there was no doubt for Upside Group that they would also rely on the specially developed concept in the second 16.4MW battery storage project in Bennewitz. The innovative battery concept for the provision of primary control reserve is based on operating data carefully evaluated since 2014, which are used to relate the state of the transmission and distribution networks as well as the activity and load of the battery storage at each moment of operation. This enabled components to be selected and precisely dimensioned in order to be used in the battery system in a future-proof manner. The result is a battery energy storage system with exceptional functional properties. The interaction of power components and battery cells is ensured by the superior and tailor-made energy management system. This provides optimum support for the battery management, which is of particular importance for the service life of the battery. With this project, Upside Group continues to invest intensively in the expansion of the German storage infrastructure and between September and November 2018 realized a reproduction of the storage facility previously built in Langenreichenbach.

The Central German region in the Leipzig area is traditionally known for its energy production. In addition to lignite, sun and wind, but also biomass, are used to generate electricity. This means, however, that the existing power lines are already heavily used, so that two 380 kV extra-high voltage lines are currently being planned/built here. Upside developed the Bennewitz project in 2017/18 in the 20kV distribution network of the network operator MitNetz in the district of Leipzig in the direct vicinity of generation and industry. The open space created by the dismantling of an old transformer station building on the substation station site was used to install the battery storage in the immediate vicinity and integrate it into the medium voltage of the transformer station so that it is ready for operation 24/7, 365 days a year. The connection, quasi at the heart of the distribution network, enables not only the integration into the control power network for the output of the PRL, but also the direct provision of further network services. In this way, the Bennewitz battery storage facility contributes to grid relief in the entire region.

With the frequency-controlled power output of the PRL, it is important to follow the fluctuating frequency to the second. This is done by the Bennewitz energy storage system using 9 SMA 1.8MVA inverters, each equipped with its own frequency control. Since November 2018, the plant has been fully functional and was subsequently prequalified for the provision of primary control power (PRL). Since January 2019 the large battery storage is operated in an SPV founded by Upside Group and increases the battery storage portfolio built and managed by Upside to more than 40MW.

After evaluating various storage technologies, the Bennewitz energy storage system relies on proven technologies from renowned manufacturers. The power electronics and the inverters come from Siemens and SMA, the world market leaders in the field of solar inverters. The battery cells used are lead-carbon dry accumulators in which the electrolyte is bound in a glass fiber nonwoven. Combined with a firmly welded ABS plastic housing with an outgassing valve, the battery cells can therefore be installed horizontally and could even be flooded without any substances escaping. The typical oversizing of the electrical and chemical components in Upside Group projects and the low fire load inherent in the technology make the Bennewitz energy storage system, like its predecessor in Langenreichenbach, one of the safest and most reliable systems in the world. Apart from that, it is also one of the largest battery storage facilities installed in Europe.

Groitzsch 16.4MW/25MWh

As previously successfully implemented in the cities of Langenreichenbach and Bennewitz, the Upside Group has now also built and commissioned a 16.4MW battery storage system at the Groitzsch site. Due to the proven network with our partners and the experiences gained during construction and detailed evaluations of the projects currently in operation an even more efficient construction and faster commissioning was possible, compared to the Langenreichenbach pilot project. The operating data, which has now been evaluated for 5 years, was used to parameterize the energy management system even more precisely in order to provide the best possible support for the battery management system. This has a positive effect on the service life of the batteries and thus significantly optimises the sustainability of the project. With this project, Upside Group continues to invest in the strategic expansion of its storage infrastructure.

In immediate vicinity of the Lippendorf power plant, which has been supplying people in the region with electricity and heat since 1926, Upside Group has built its next battery storage system. This means that the latest storage and control technology now stands alongside a traditional producer. With the implementation of the planned power plant deconstruction, a further expansion of renewables such as solar energy and wind energy will become even more important. The region already needs efficient frequency control due to fluctuating electricity volumes. Since this necessity will be even more important in the future, Upside Group together with the distribution network operator Mitnetz has decided to install a further Upside storage system here. In this project, too, the greatest possible proximity to a central network connection point was set. For this reason, the battery is located on an open area directly on the site of the Groitzsch substation, which was created by the dismantling of outdated operating rooms. The substation currently supplies 25,000 people, so that since September 2019 the directly connected battery system has been providing primary control power and other grid services to ensure energy security for people throughout the region. Around the clock, 365 days a year.

Due to the frequency-driven power provision in the PRL, it is important to follow the fluctuating frequency to the second. The Groitzsch battery storage unit handles this with 9 inverters of 1.8MVA each, each equipped with its own frequency control. The system has been fully functional since August 2019 and has subsequently been successfully prequalified for the provision of primary control power. Since September 2019, the large storage facility has been operated in an SPV founded by Upside Group and increases the battery storage portfolio built and managed by Upside to over 56 MW.

The Groitzsch battery system, like the identical storage facilities in Langenreichenbach and Bennewitz, relies on proven technologies from renowned manufacturers. The power electronics and the inverters come from Siemens and SMA, the world market leader in the field of solar inverters. The battery cells manufactured by Narada Power Source are lead-carbon dry accumulators in which the electrolyte is bound in a glass fiber fleece. Combined with a tightly welded ABS plastic housing with an outgassing valve, the battery cells can therefore be installed horizontally and could even be flooded without any substances escaping. As in all Upside projects, special attention was paid during construction to ensure sufficient reserves of electrical and chemical components. In conjunction with the low fire load inherent in the cell technology, the Groitzsch battery storage system is one of the safest and most reliable storage projects in the world, just like its predecessors in Langenreichenbach and Bennewitz. Apart from that, it is also one of the largest battery systems installed in Europe.

Neuhardenberg 5MW/5MWh

The energy storage Neuhardenberg is located in close proximity to Germany's largest solar power plant (145 MWp). The project was funded by the ERDF and supported by the State of Brandenburg and has been in operation since April of 2015. The plant is prequalified for the provision of primary control power and is part of Upside Group’s inventory as the first self-developed large scale storage system.

An old aircraft hangar at the edge of the solar park. Where the National People’s Army of the GDR used to maintain their fighter planes, now is where one of the most advanced energy storage systems of all is located. Even though it is right next to the old airfield, thus situated right by Germany's largest solar park, the storage system has an own grid connection point and is ready for operation 24 hours a day and in all weather conditions. This permits the inclusion into the operating reserve network for the frequency-controlled output of the primary control power. This way, the energy storage system Neuhardenberg contributes to the grid relief of a region, which clearly generates more power through wind and solar energy than it consumes – thus evidently reaching the limits of grid compatibility.

Work is the product of power and time. In the frequency-controlled output of primary control power, it is important to follow the shifting frequency exact to the second. This occurs in the energy storage Neuhardenberg simultaneously and independently in 20 converters, each equipped with its own frequency control. 4 of these converters are brought together on one transformer at a time. When combined with an active battery management system (BMS), ensuring the necessary energy balance on a cellular level, the result is an extremely robust and failsafe integral system with maximum efficiency.

The energy storage system Neuhardenberg utilizes the latest technology by renowned and innovative manufacturers. The power electronics of the converters draws on the Siemens technology SINAMICS. The battery cells are made up of lithium iron phosphate, a technology, which is well established and frequently employed for decades. These cells are constructed fail safe and accordingly flame resistant. In addition, the technical components are all significantly oversized and the performance rate is 1C at max., making the energy storage system Neuhardenberg one of the world's most reliable systems of its size.

Alt Daber 2MW/2MWh

The energy storage Alt Daber is located in close proximity to one of the largest solar plants in Germany (67.8 MWp). The storage project was funded by the ERDF and the State of Brandenburg and has been in operation since October of 2014. The plant is part of Upside Group’s inventory and is prequalified for the provision of primary control power.

The former military airbase Alt Daber in northwestern Brandenburg was converted for new utilization in 2011. On an area of around 147 ha one of Germany’s largest solar parks was built with a power of 67.8 MWp. During the construction of the energy storage system, a concept for hybrid utilization was implemented, making it one of the most innovative projects in Germany that has ever been realized. This type of hybrid application drawn from wind or photovoltaic energy combined with mass energy storage can be deployed both in weak grid areas as well as provide ancillary services for grid stabilization.

The energy storage Alt Daber is designed using a hybrid controller for hybrid applications with renewable power plants, so that it can also be used in weak grid areas as well as alternatively in order to compensate for fluctuations in the volatile energy supply of a neighboring wind or solar plant. Currently the application is focused on the provision of ancillary services as part of the marketing of primary control power.

The energy storage system Alt Daber is based on a holistic systemic approach of an "Energy Buffer Unit". The lead-acid battery cells, which have been adjusted to be utilized in mass storage systems are the backbone of the robust system architecture. All system components are designed for permanent use in wind or solar power plants as well as the provision of ancillary services. The container design allows for quick and easy installation even in areas with poor infrastructure.