Tony Abbott has fired a telling shot across Malcolm Turnbull's bow, warning that any energy package agreed to in cabinet must also pass a party room wary of anything approaching a clean energy target or other subsidy scheme for renewables.

It came as the Turnbull government received more bad news in the fortnightly Newspoll series, prompting Mr Abbott to declare a future return to the leadership was possible but would occur only if he was drafted by colleagues, which he described as "almost impossible to imagine".

Signalling that Coalition MPs will be no rubber stamp on energy, the dumped former prime minister said the backbench deserved "plenty of chance to digest" the formula.

Mr Abbott's blunt message sets the stage for another showdown over a policy area that has divided moderates and conservatives within the Coalition for a decade, and become a constant cipher for simmering leadership rivalries.