Unite union national officer Kevin Coyne said: "At last the Government has provided the stability and certainty the UK needs to begin to meet the huge energy challenge facing us.
"Nuclear power is a key part of a balanced, low-carbon energy policy.
"The go-ahead at Hinkley Point will deliver thousands of skilled jobs in construction, manufacturing and the operation of the power station.
"The deal will hopefully pave the way for more power stations which will in turn generate more skilled jobs."
More top news
West Ham United have confirmed Sam Allardyce will not continue as their manager next season.
A goalless draw at home to Manchester United condemned Hull to the Championship next season.
Steven Gerrad's final Liverpool game ended with him scoring, but overall embarrassment for the team.