Malcolm Turnbull convinced his party room to support his national energy plan, but now he needs to do it all over again with some new measures attached.
Parliament returns on Monday with potential leadership tension also afflicting the coalition after reports Home Affairs Minister Peter Dutton was considering challenging Mr Turnbull for the top job.
But frontbenchers rejected the claims Mr Dutton would challenge over the National Energy Guarantee, which is proving controversial within the coalition.
Coalition frontbencher Christopher Pyne said the leadership was listening to concerns about keeping power prices down.
"That's why the prime minister and the cabinet will propose a big stick approach to electricity prices next week, because we want to bring prices down too," Mr Pyne told the Nine Network on Friday.
The government said the legislation for the guarantee would be introduced into parliament in August, but that was before the cabinet agreed to include elements designed to bring down prices.
The Senate will also deal with corporate tax cuts, which appear doomed to fail unless the government can win more crossbench support.
"We would like to see the Senate pass the legislation but we don't take anything for granted," Finance Minister Mathias Cormann told Sky News on Friday.
"We are open to engage constructively with the crossbench on any suggestions, right up until the last minute."
The government needs at least eight of the 10 crossbenchers to get the unpopular corporate tax cuts through, but so far only four have agreed.
The draft laws, which slash the tax rate for all businesses from 30 to 25 per cent, have been listed for debate in the upper house on Monday.
The lower house will debate a bill giving extra support to farmers doing it tough in the drought, as well as draft laws banning modern slavery.
Labor is looking to amend the modern slavery bill to split out reporting of forced marriage, which the party believes should be a separate law.
Pauline Hanson will continue her push in the Senate for a plebiscite on Australia's migration levels, while senators will continue debating the government's cashless welfare card trial.
Following a week in which Katter's Australian Party senator Fraser Anning called for a ban on Muslim migration, Australia's first female Muslim senator Mehreen Faruqi will be sworn in on Monday.
