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The installations are designed to improve grid flexibility, regulate voltage and accommodate more renewable energy.
The systems, located in Sáregres, Devecser, Erdőkertes and Püspökszilágy, have sufficient combined capacity to manage production from approximately 1,000 residential solar installations, according to E.ON. They can store energy equivalent to the daily consumption of up to 2,000 households.
The project also included an energy management system that continuously monitors grid conditions and automatically determines when the batteries should charge or discharge. This allows the installations to respond to changes in electricity production and consumption while maintaining appropriate voltage levels.
When solar panels generate more electricity than is needed, the batteries store the surplus. They can then return that electricity to the grid when consumption rises or solar output falls, including during changes in weather.
E.ON said the growth of renewable generation, electric vehicles and heat pumps is placing new demands on electricity networks. Storage can help grid operators adapt to these changes while allowing a greater share of renewable energy to be integrated into the system.
“The energy system of the future will increasingly rely on renewable energy sources, which requires a grid that can flexibly adapt to changes in production and consumption. Energy storage allows us to use energy from renewable sources when it is needed most,” E.ON Hungária Group Deputy CEO Zsolt Jamniczky said at the official inauguration in Püspökszilágy.
András Tótth, a state secretary at the Ministry of Economy and Energy, said secure energy supplies were a government priority and highlighted the role of storage in balancing production and consumption.
“Such investments not only increase the flexibility of Hungary’s energy system but also create engineering and operational expertise that can be applied to subsequent developments,” he said.
The installations also supported the network during what E.ON described as the summer energy crisis in July and August.
Engineers introduced a test operating schedule for the systems, which had already been commissioned. The batteries were reprogrammed to absorb electricity during periods of lower demand and discharge it during the critical evening peak.
According to E.ON, the adjustment demonstrated that the equipment could provide a flexible reserve to ease pressure on the network alongside its regular voltage regulation duties.
The investment forms part of E.ON’s Matesz project, supported by nearly HUF 3 bln through the Ministry of Economy and Energy and administered by the National Energy Agency. Funding comes from the EU Modernization Fund under a program supporting grid-integrated energy storage investments.
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