The head of the expert board advising the federal Coalition on its signature energy plan says it would not be a "big drama" for the electricity industry if a future Labor government enforced far stronger cuts to greenhouse gas emissions.

Labor states say they will withhold final support for the Turnbull government proposal to merge climate and energy policy - known as the national energy guarantee - until they are assured a successive government will not be blocked from ratcheting up carbon savings.

Dr Kerry Schott is advising the federal government on the energy plan Credit:Alex Ellinghausen

Kerry Schott, the chair of the Energy Security Board, which is devising the policy, told Fairfax Media that such a change was "part of your normal course of business".

"If you are in the market and you have the mechanism there then you know you are always subject to changes in legislation, and you are also subject to changes in fuel cost and changes in technology," she said.