The Greens are set to move a motion in the Senate on Monday seeking to pull back the curtain on the calculations behind the federal government's energy promises.
Senator Richard Di Natale will call on the government to release the full modelling for the proposed final design of the National Energy Guarantee to enable scrutiny of the government's claim that it will result in lower emissions and power bills.
Greens energy spokesman Adam Bandt MP said the government was yet to provide sufficient detail on the plan, which aims to guarantee the reliability of the power network and curb rising prices while cutting emissions.
"We need to see the full modelling behind these outlandish claims before decisions get made about the NEG," Mr Bandt told Fairfax Media on Sunday.
"The government has only produced a spreadsheet and chart pack, which really doesn't cut it."
Some critics of the NEG have questioned the government's claim that wholesale electricity prices will fall by a further 20 per cent under the policy, and its assertion that greenhouse emissions will fall further than they would in its absence.
Federal Labor wants a 45 per cent emissions reduction target, rather than the 26 per cent target the government says would be reviewed in 2024.
The Greens were on Sunday canvassing support among the minor parties for Senator Di Natale's motion, which Labor is expected to support.
"Malcolm Turnbull is promising a $550 power bill drop from the NEG, exactly the same amount Tony Abbott promised from the repeal of the carbon price, which instead led to a doubling of wholesale power prices," Mr Bandt said.
Environment Minister Josh Frydenberg declined to say whether the government would oppose the Greens motion.
Mr Frydenberg, who will present the NEG legislation to the Coalition partyroom when Parliament resumes this week, said on Sunday that he was confident the majority of his colleagues would support the policy.
“My colleagues are focused on one thing, which is to reduce people’s power bills, and rightly so, and we have turned the corner," he told Insiders.
Detailed modelling of the NEG was prepared by ACIL Allen Consulting on behalf of the Energy Security Board, which falls under the COAG Energy Council.
A 14-page summary of the modelling appears in a document released for public consultation earlier this month, but the full detail has been withheld despite calls from a coalition of energy academics, who have written to energy ministers calling for its release.