The Chinese firm helping to build the new nuclear power station at Hinkley Point said it was now "able to move forward and deliver" nuclear capacity at other UK sites after the Government go-ahead for the £18bn project.
Ministers ended uncertainty over Hinkley by saying it had reached a "new agreement" with French energy giant EDF, imposing "significant new safeguards" for future foreign investment in critical infrastructure.
Chinese state-owned company CGN, which has a third stake in the scheme, said it was "delighted" with the decision.
The firm is hoping to win contracts to build new nuclear power stations at Bradwell in Essex and Sizewell in Suffolk.
A statement said: "We are now able to move forward and deliver much needed nuclear capacity at Hinkley Point, Sizewell and Bradwell with our strategic partners, EDF, and provide the UK with safe, reliable and sustainable low-carbon energy.
"CGN and EDF have worked together in close cooperation for decades and this has laid a solid foundation for these three new nuclear projects.
"CGN looks forward to leveraging its 30 years' experience in nuclear construction and operation and playing an important role in meeting the UK's future energy needs."
The government said: "Following a comprehensive review of the Hinkley Point C project, and a revised agreement with EDF, the government has decided to proceed with the first new nuclear power station for a generation.
"However, ministers will impose a new legal framework for future foreign investment in Britain's critical infrastructure, which will include nuclear energy and apply after Hinkley."
Greg Clark, secretary of state for business, energy and industrial strategy, said: "Having thoroughly reviewed the proposal for Hinkley Point C, we will introduce a series of measures to enhance security and will ensure Hinkley cannot change hands without the Government's agreement.
"Consequently, we have decided to proceed with the first new nuclear power station for a generation.
"Britain needs to upgrade its supplies of energy and we have always been clear that nuclear is an important part of ensuring our future low-carbon energy security."