At a NSW budget estimates hearing on Tuesday, Labor MP Rose Jackson asked Matt Kean about comments made by Premier Dominic Perrottet that "when it comes to meeting our net zero target ... we are completely on track without any additional policy change at all".

"That's wrong isn't it?" Ms Jackson asked.

Mr Kean said Mr Perrottet was referring to achieving a 47-52 per cent reduction in 2005 emissions levels by 2030, which would then put the state on track to meet its net zero 2050 target.

He conceded new policies would have to be made to hit the second target but wouldn't speculate on them, saying there will be new technologies and opportunities to reduce the state's carbon footprint in the future.

Mr Kean said the NSW plan is the most ambitious in the nation and focused on increasing renewable energy and electric vehicles as well as decarbonising the electricity grid.

He would be "interested to see a single policy from Labor" on attracting investment in green technology and energy generation, he said.

Ms Jackson said that was a "ludicrous" answer to the question of when a statewide adaptation plan that the government committed to in 2016, and which every other state already had, would be finalised.

Mr Kean said the plan would be available "as soon as we're ready to make it available".

"You've had from 2016 ... when are we going to see it?" Ms Jackson asked.

Shortly after Mr Kean defended the premier's comments on reaching net zero, Mr Perrottet repeated them at a press conference.

"In relation to net zero, we didn't have to change one policy setting to achieve that aim," he said on Tuesday.

Ms Jackson said the premier didn't understand that policies will need to change.

"Because that's actually quite a fundamental issue if he thinks that we're going to get there on current policy settings, and we're not, that's a pretty significant misunderstanding."

Mr Kean questioned why Chris Minns has been leader for months but "we've seen more environmental policy from known greenie Dominic Perrottet than we have from Labor".

He said he was "proud" that a coalition government was "leading the way" on emissions reduction.

Asked if he'd seen the modelling his federal coalition counterpart Angus Taylor was relying on for federal emissions reduction strategies, Mr Kean said the hearing would be "shocked to hear" that he hadn't.

"No I haven't sought a copy of Mr Taylor's modelling... we've done our own based on our plans and policies,." he said.

Australian Associated Press