The government's clean power regulator has recorded a jump in investor interest and Environment Minister Greg Hunt says there is "no excuse" not to embrace renewable energy, underlining the Coalition's new enthusiasm for the sector since Malcolm Turnbull became Prime Minister.

Mr Hunt said Australia's recent greenhouse gas emissions targets must be "flexible", which leaves the way open for deeper cuts in future, and said the government will push for its Asia Pacific rainforest protection measures to be adopted globally at international climate talks in Paris in December.

Mr Turnbull and his ministers have sent positive signals to renewable energy operators since the leadership change a month ago, in a departure from the Abbott government, which at times appeared to wage war on the sector.

Speaking at a green technology conference in Canberra on Wednesday, Mr Hunt said the renewables sector offered "significant investment opportunities".