Green Energy Investhor Zrt. (GEI) has successfully completed the trial operation of its energy storage development in Paks, and the system has, therefore, begun commercial operation. The energy storage facility connected to GEI’s solar power plant in Paks contributes to the more balanced and efficient use of renewable energy generation, while supporting the stability and flexibility of the electricity system. According to GEI, energy storage facilities may play a key role in Hungary in the operation of a renewable energy-based electricity system in the coming years.
Budapest, 17 June 2026 – Green Energy Investhor Zrt. (GEI) subsidiary MB Sunissimo Primo Kft. has successfully completed the trial operation of its energy storage development in Paks, and the system has, therefore, begun commercial operation. The energy storage facility, with a nominal capacity of 21 MVA/48 MWh, is connected to GEI’s Paks solar power plant, which was commissioned in 2024, and supports its operation by enabling more flexible adaptation to the power grid.
The aim of the development was to further strengthen the operating model and cost-effectiveness of weather-dependent solar power plants. The energy storage facility enables the electricity generated during periods of overproduction – for example, during peak sunshine – to be stored by the system and then fed back into the grid later – for example, during morning and evening consumption peaks – rather than having to curtail output or lose significant amounts of energy. The solution, therefore, contributes to balancing energy production, mitigates fluctuations arising from the cyclical nature of weather-dependent generation, and supports the stability of the domestic electricity system.
According to GEI, energy storage facilities are playing an increasingly important role in the efficient integration of renewable energy generation. “In the coming years, energy storage may gradually become an economic necessity in the renewable energy market. Such systems are playing an increasingly important role in enhancing the flexibility of the electricity system and in managing fluctuations arising from renewable-based energy generation. Energy storage facilities not only make it possible for a higher proportion of the green energy generated to be utilised, but also ensure that electricity is available even when solar power plants are not generating,” said Antal Ritter, CEO of Green Energy Investhor.
Following the completion of the permitting processes, construction work on the energy storage facility began in February 2026. In recent weeks, the necessary charging and discharging tests have also been carried out, and the 72-hour trial operation was successfully completed, meaning that the system is now already operating commercially.
The domestic energy storage market is currently still at an early stage of development: energy storage capacity in Hungary currently stands at approximately 200-300 MW of power / 400-500 MWh of storage capacity, consisting primarily of large, industrial-scale systems. At the same time, market expectations indicate that significant expansion is expected over the next 2-3 years, and domestic energy storage capacity could reach as much as 500-800 MW of power / 1-1.5 GWh of storage capacity. Growth is supported both by state incentive programmes – including the Jedlik Ányos Programme – and by corporate developments implemented as own investments, such as this development by GEI.
Over a longer, 5-10-year time horizon, the emergence and spread of residential energy storage systems may also become a defining trend. Although their individual output is typically lower, their large numbers could enable them to play a meaningful role in increasing the flexibility of the electricity system, particularly with an appropriate support and incentive environment.
Hungary currently has around 8,500-9,000 MW of installed solar power plant capacity in operation, of which approximately 2,000-2,500 MW consists of residential rooftop solar systems. The development of storage capacities is, therefore, playing an increasingly prominent role on both the industrial and residential sides.
Green Energy Investhor (GEI)
Green Energy Investhor (GEI) is an energy development and investment company that contributes to Hungary’s sustainable and competitive energy supply by implementing projects based on renewable energy sources. The company’s main activities include the development, financing and long-term operation of wind and solar-based power plants, as well as related energy storage solutions.
GEI aims to strengthen the country’s energy independence, reduce exposure to imports and contribute to meeting climate goals through innovative, professionally sound and socially accepted investments. Sustainability, transparency and cooperation with local communities are at the heart of its operations. GEI is committed to ensuring that green energy developments contribute responsibly to Hungary’s long-term energy security and sustainable future, while keeping environmental and social considerations in mind.