In a field in a remote part of north-west Wales, a lone farmer cuts the grass, parcelling it up into hay bales which can be sold for a modest profit. His farm, and even the hill on which it sits, will soon be demolished by the Japanese-owned company Horizon — ground zero in an ambitious scheme to build one of a string of nuclear power stations across the UK.

Wylfa, on the island of Anglesey, is one of several sites designated for the plants, which could cost up to £100bn and, if all goes to plan, will replace the UK’s ageing coal power stations. But despite the billions of pounds about to be poured into nuclear energy in Britain, only some is likely to stay in the UK. Of the six plants being planned, none will be owned by a British company.

For nuclear power groups from France, China, the US and Japan, the UK’s ambitious plans represent a ripe opportunity in an otherwise difficult global market. Following the meltdowns at the Fukushima plant in Japan in 2011, several countries, including Japan and Germany, scaled back or cancelled their nuclear energy plans.