Energy minister Greg Barker, who has led the Green Deal for the government, has resigned from his post at the Department of Energy and Climate Change.
In his resignation letter to David Cameron, Mr Barker said he wants to take up new challenges, outside Parliament.
Mr Barker also highlighted the departments achievements which include creating the Green Investment Bank, the establishment of Marine Energy Parks to boost wave and tidal power and introducing the Green Deal.
Tributes were paid to Mr Barker on Twitter.
The prime minister’s official letter of response stated: “You have served continuously on the Conservative front bench for over a decade and I hope you can be enormously proud of all you have achieved over the years covering the related briefs of Environment and, more recently, Climate Change.
“In particular, you have led successful investment into our energy infrastructure, making the UK a world-leader in renewable technology. You have established the Green Investment Bank, and mobilised over £3 billion investment into our renewables sector last year alone.”
REA chief executive Dr Nina Skorupska said: “Greg Barker was the only DECC Minister to have been in post since the last election. Not only did he bring stability to the department, he also brought passion and enthusiasm.
“Although during his stewardship he had to make tough decisions we didn’t agree with, there is no doubt that Greg was a champion for green business. I hope he continues to be an advocate for a low carbon economy, ensuring the UK’s energy is sustainable and secure.
“We look forward to working with Matt Hancock, Amber Rudd, Liz Truss, Penny Mordaunt, Claire Perry and John Hayes, who all landed key positions in the reshuffle, to seize the opportunities for new investments and jobs in renewable power, heating and transport fuels.”
UK Green Building Council chief executive Paul King said Greg Barker provided unstinting support for climate and energy policy in a very difficult political and economic climate and his resignation will leave a big hole in Government. However he said he looks forward to working with the new Parliamentary Under Secretary to transform the energy efficiency and affordability of the UK’s building stock.