CTG is paying €2.7bn ($3.5bn) for the Portuguese government’s stake in EDP, which is being sold to raise money for the debt-stricken nation’s coffers.

The Chinese group – which built the world’s largest dam in China – says it will partner with EDP in developing renewable energy projects.

EDP’s renewables subsidiary, EDP Renováveis (EDPR) , claims to be the world’s third-biggest wind-power producer and has about 7.3GW