A deal to build Britain's first new nuclear plant in a generation is due to be announced today.
The government has been in negotiations with French-owned EDF Energy over the Hinkley Point C project for more than a year.
However, ministers are now believed to have agreed on a "strike price" - the guaranteed rate to be paid for electricity produced at the Somerset site.
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Labour strongholds tended to remain so - apart from a major loss for the party in Dudley.
Labour suffered a "terrible" defeat in Rhondda but has already won 16 Welsh Assembly seats as it looks to record a fifth term in office.
UKIP have made further gains in the local elections in the Anglia region and the Conservatives have won back control in Peterborough.