The HUF 784.52 million investment was carried out partly with non-repayable funding from the European Union’s Recovery and Resilience Facility (RRF) and partly from E.ON’s own resources.
The project falls under the RRF-6.5.1-23 call for proposals on installing network energy storage for market participants.
The storage system has a capacity of 5.5 megawatt-hours and a power output of 2.5 megawatts, spread across 16 outdoor cabinets. Each cabinet, weighing 3.6 tons, contains liquid-cooled lithium iron phosphate (LFP) batteries. The system also includes two 1.25 MW converters and a 3,150 kVA transformer. Operated remotely as part of a smart grid, it requires no on-site supervision.
E.ON said the facility can store the daily output of 350 household solar systems. That amount of energy could power an electric car for 43,000 kilometers — enough to circle the Earth at the equator — or fully charge 370,000 mobile phones in one discharge cycle.
The storage unit helps balance supply and demand by charging during times of surplus generation and discharging during shortages, thereby reducing voltage fluctuations and potential outages. It also indirectly allows more solar panels to connect to the grid, supporting Hungary’s National Energy and Climate Plan.
With this new addition, E.ON’s Soroksár substation now houses a combined 12.5 MW of power and 11.5 MWh of capacity, including Hungary’s first large-scale battery system installed there in 2018.
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