Malcolm Turnbull's popularity with voters has taken a dive in the wake of Super Saturday, according to the latest Newspoll.

His standing as “Better Prime Minister” has tumbled four points to 44 percent, while Bill Shorten's has risen three points to 32 percent, the Australian reports .

The Coalition's primary vote is down dropping two points and Labor slightly down as well.

In the two-party preferred vote, the Coalition continues to trail Labor 49 to 51 percent.

Malcolm Turnbull's popularity with voters has taken a dive in the wake of Super Saturday, according to the latest Newspoll. (AP)

This marks the 38th consecutive Newspoll in which the Coalition has trailed Labor.

The worrying figures come as Mr Turnbull faces a showdown with rebel MPs tomorrow on the future of energy supplies and prices.

It will be the last roll of the dice to get the government's company tax cuts through.

Malcolm Turnbull is still ahead as preferred Prime Minister but the gap is narrowing. (Supplied)

Mr Turnbull is reportedly pushing Energy Minister Mr Frydenberg and Treasurer Scott Morrison for the release of a new plan for a subcommittee cabinet members convened to discuss energy.

That cabinet would have the power to approve government underwriting of new-generation power sources.

Meanwhile, the ALP's primary vote has fallen one percentage point to 35 per cent, the Newspoll suggests.

One Nation's primary vote has jumped two percentage point to nine percent.

Bill Shorten and Labor have had a boon following super-Saturday by-elections (AAP)

In the Super Saturday by-elections on July 28 the Coalition particularly struggled in the Queensland seat of Longman, recording a primary vote of just 29.6 percent, while One Nation picked up 15.9 percent of first preferences.

Labor's Susan Lamb retained the seat, securing almost 40 percent of the primary vote.