South Korea’s largest power company is in talks with Toshiba to prop up its plans to build Europe’s largest new nuclear plant in the UK.

Jong-hyuck Park, an executive from Kepco, confirmed the group’s interest in buying a stake of the embattled Moorside nuclear project on the sidelines of an industry event, but said Kepco would want to use its own reactor design.

The South Korean state-backed utility is one of the world’s strongest nuclear developers and has harboured an interest in Moorside since 2013. Its appetite for a UK nuclear project was revived following the collapse of Toshiba’s US nuclear business, Westinghouse, which was supposed to provide the reactor design for the project.

A deal with Toshiba, the last remaining group behind the NuGeneration venture, could rescue the £10bn project. But a change in reactor design would also derail the 2025 start date by at least two years in a further blow to the UK’s new nuclear ambitions.