Greenpeace has slammed the government's go ahead of Hinkley Point claiming it saved the PM "political embarrassment".
Greenpeace's executive director, John Sauven, said there are "huge outstanding, financial, legal and technical obstacles that can't be brushed under the carpet."
He said the new conditions on the deal "changes almost nothing" and he warned that there might be months or even years of wrangling over issues.
Today's decision hasn't been made on the cold, hard facts that show Hinkley will not deliver competitively priced, low carbon energy any time soon. Instead it seems that Hinkley became too big to fail. The potential for political embarrassment for the new Prime Minister was too high.
He added that the government should support renewable power that to provide energy at a competitive price.
Why does the government want a new nuclear plant at Hinkley Point and why has it proved so controversial?
Government officialscan't provide any detail about how a national security test for future critical infrastructure deals will be applied.
The government approved new nuclear power plants back in 2006 but the plan for Hinkley was only given the go ahead 10 years later.