The deputy chief executive of RenewableUK - a trade association for the renewables industry - has said he is "disappointed" by Mr Hayes' comments.
Maf Smith told the BBC Radio 4 Today programme that his comments do not sit comfortably with what he said at a renewables conference last night.
At our conference he was talking about the importance of renewables in the mix, the importance of wind, the importance of jobs and securing benefits for renewables.
What we would like is clarity about those views. We understand some of those things that have been said in print this morning are not Government policy.
More top news
Huge busts of the Grand Tour presenting trio's heads have been spotted being wheeled through the US West Coast and later Sydney.
The mother of the accused had a heart attack after hearing graphic details of the bloody Charleston massacre.
Donald Trump has discussed the "long-standing relationship between Scotland and the United States" in a call with Nicola Sturgeon.