Beznau nuclear power plant: Unit 2 back on grid

06.10.2025 - The Beznau nuclear power plant (KKB) has completed the annual overhaul of unit 2. Following approval by the Swiss Federal Nuclear Safety Inspectorate (ENSI), the plant was reconnected to the grid over the weekend.

Since early August, the overhaul of unit 2 of the KKB focused on maintenance work, recurring inspections and examinations. In addition, integral system tests were carried out as usual. Of the total installed fuel elements, 20 were replaced with new ones and inserted into the reactor core.

As part of the restart, unit 2 underwent various routine tests as usual. Power operation was ramped up gradually.

The Beznau Nuclear Power Plant produces around 6 terawatt hours of electricity, safely and reliably, every year – which meets about one tenth of Switzerland’s power requirements. The two power plant blocks are taken off grid separately in spring/summer for fuel element replacement or revision. They then resume their contribution to Switzerland’s security of supply for around another year, something which is particularly vital in the winter months.