Mr Goodall thinks no nuclear will mean more coal power stations like Didcot.
An Oxfordshire Green Party member selected as a prospective parliamentary candidate has clashed with his party's leader over nuclear power.
Chris Goodall wrote that more nuclear power stations might have to be built.
He has been chosen to stand for Oxford West and Abingdon at the next election.
Green Party leader, Caroline Lucas, said: "It is of great concern that a candidate should be promoting a policy at odds with the party manifesto. I shall be taking that forward."
Ms Lucas added: "In any party, you have a range of different views, but once selected as a parliamentary candidate, you have a particular responsibility."
On the subject of whether Mr Goodall will face disciplinary action or even de-selection as a parliamentary candidate Ms Lucas said: "We will be taking appropriate measures."
However, Mr Goodall said he stands by the views he first published on his blog: "I have no great liking for nuclear, but we have to be rational.
"The rate of progress on renewables is so slow, it may be inevitable that we have to adopt a programme of constructing new nuclear power stations to keep the energy supply at its current level."
Any decision to deselect Mr Goodall would be taken by the local Green Party.
Cllr Craig Simmons, who leads the Green Party on Oxford City Council, said: "Chris has an enviable record as an environmentalist who is leading the field with his books, none of which promote nuclear.
"He remains our prospective parliamentary candidate."