A defiant Malcolm Turnbull has insisted he will win the next election, while setting out a laundry list of his government's achievements during the nearly two years he has occupied the nation's top political job.

In a lengthy - and at times heated - interview with the ABC's Leigh Sales on 7.30 on Monday night, Mr Turnbull also said his government had no plans to build a coal-fired power station - despite pressure from within his government to do so - and said he was confident that three Coalition MPs, including deputy Prime Minister Barnaby Joyce, would be found by the High Court to have been validly elected.

The Prime Minister also foreshadowed that his government would make a decision by the end of this year on whether to adopt a clean energy target, as recommended by chief scientist Alan Finkel and backed by power companies again on Monday.

Mr Turnbull will meet power company bosses again on Wednesday to demand action to deliver cheaper prices for consumers. Meanwhile, he is also under pressure from the ramp-up of the same-sex marriage postal survey campaign, and the 18 consecutive Newspolls that show the Coalition trailing Labor.