Temelín Nuclear Power Plant to replace key transformers

The Temelín Nuclear Power Plant is preparing to replace its shunt transformers, which provide electricity for the plant's own internal consumption. ČEZ is investing hundreds of millions of Czech koruna to acquire five new units: four for active operation (two on each production block) and one to serve as a standby reserve.

The replacement process is scheduled to take place during planned fuel replacement outages. The second block will undergo the replacement in 2027, followed by the first block in 2028. Each replacement is expected to take approximately five weeks per block.

This modernization is part of a long-term strategy to ensure the plant's operation for up to 80 years, potentially lasting until 2080 or 2082. The new equipment will feature advanced real-time diagnostics and more precise voltage regulation, which will improve maintenance planning and enhance the stability of the internal power supply for critical systems like pumps and ventilation.