Mochovce: Unit 3 connected to the power grid

Mochovce: Unit 3 connected to the power grid
The line will serve as power source for construction and commissioning. After that, it will deliver electricity from Unit 3 to the Slovak power grid.

Slovenské elektrárne successfully connected Unit 3 of the Mochovce Nuclear Power Plant to the Slovak Power Grid. The connection will serve as the main power source for unit construction and commissioning. Upon completion of Unit 3, the line will deliver electricity produced by the unit to the country’s transmission system.

"We have reached  a major milestone towards the commissioning of Mochovce nuclear plant. The completion of Unit 3 grid connection confirms the significant progress achieved on site and our next step is to focus on finalising the cold hydro tests as well as starting pre-operational hot functional testing. Once Unit 3 is up-and-running, its power output will be delivered through the 400 kV transmission line to the substation in Velky Dur before reaching Slovak consumers. The cooperation with Slovak transmission system operator SEPS and other technical partners was extremely successful and may serve as a benchmark for other similar major power generation projects," said Francisco José Morejón Verdú, project director of Mochovce 3 and 4. 

The 400 kV line will serve as the primary power source for the final stages of the unit’s construction and its commissioning. The line will power all of the nuclear unit’s electric systems and equipment through transformers and the busducts delivering electricity to four main 6 kV switchboards. Backup will be provided by a 110 kV line already in operation.

The transmission line was powered in close cooperation with the Slovak Electricity Transmission System Operator (SEPS – Slovenská elektrizačná a prenosová sústava, a.s.). The overall connection proces was carried out in line with all relevant national and international legislation as well as standards, including IAEA guidelines.

In line with the strategic plan of Slovenske elektrarne, approved in March 2017 by the company’s shareholders, the start of operations of Mochovce’s Unit 3 is expected by the end of 2018 and Unit 4 by the end of 2019. At the end of 2017, Mochovce 3 was 96.1% complete and Mochovce 4 was 84.5% complete.