Hungary’s sole nuclear power station will cut output from one block by half starting April 29. The nuclear energy authority said the reduction stems from needed repairs to a generator support system. This move brings immediate supply constraints to the national grid and signals a temporary dip in the country’s renewable mix for energy production levels.

Reducing Block 2 output by 50 % will shave roughly half a gigawatt from Hungary’s total generating capacity. While the plant has long supplied a stable base load, the shutdown could trigger a modest uptick in electricity imports until repairs finish. Energy traders will monitor the grid’s response closely for the next weeks as operations resume overnight.

The decision underscores the vulnerability of a single-source nuclear supply. Operators face a tight window to complete the generator support repairs, likely within a few weeks. Until then, Hungary’s energy mix will lean more heavily on fossil and hydro sources, nudging short-term prices higher across the Central European market for the next month ahead of.

Investors in Hungary’s electricity sector will track the repair timeline closely, as any delay could squeeze profit margins for the state‑owned operator. Meanwhile, transmission operators will adjust load flows to accommodate the reduced capacity, ensuring grid stability while the plant works to restore full output as the end of June as maintenance wraps up and operations.