E.ON has introduced a mobile series voltage regulator on Hungary’s medium-voltage grid to address growing voltage fluctuations linked to the rapid expansion of rooftop solar. The first unit, installed between Letenye and Nagykanizsa on a rural feeder near Rigyac, represents an investment of 800,000 euros.
Solar generation often peaks during the day when household demand is low, while consumption rises in the morning and evening. This imbalance puts stress on feeders located far from high-voltage backbones and substations. The newly deployed regulator helps stabilize voltage along the line, improving power quality and reducing unwanted outages without the need to build additional circuits.
Mounted on a skid, the device can be quickly installed and moved as grid conditions evolve. Its flexibility makes it a cost-effective interim solution in areas where conventional reinforcements would take longer, require higher spending, or cause greater environmental impact. By increasing hosting capacity, the regulator enables the connection of more rooftop and utility-scale solar systems while ensuring stable service for local users.
E.ON plans to purchase more units and redeploy them as grid upgrades move forward. The company sees the technology as a tool to ease network bottlenecks, connect new renewable generation, and postpone large-scale line construction, supporting its broader goals of expanding renewable energy use and reducing the cost and environmental footprint of grid development.
