The Abbott government's carbon tax repeal bills are heading back to the upper house with Palmer United Party amendments.
The bills passed the House of Representatives after the coalition fast-tracked debate on Monday.
There was muted celebration in the chamber from the coalition.
PUP leader Clive Palmer has vowed to give his party's backing for the repeal in the Senate after demanding amendments that ensure cost-savings are passed on to consumers.
Only gas and electricity firms and bulk suppliers of synthetic greenhouse gases face penalties of up to 250 per cent to any savings they fail to pass on.
They have 30 days to inform the consumer watchdog of how prices will be cut.
Smaller importers of items such as refrigerators, cars and air conditioners will not be affected.
The government said the changes will clarify who is covered and how business can pass on the savings.
The bills are expected in the Senate on Tuesday, Mr Hunt later added on Twitter.
There was muted celebration in the chamber from the coalition.
PUP leader Clive Palmer has vowed to give his party's backing for the repeal in the Senate after demanding amendments that ensure cost-savings are passed on to consumers.
Only gas and electricity firms and bulk suppliers of synthetic greenhouse gases face penalties of up to 250 per cent to any savings they fail to pass on.
They have 30 days to inform the consumer watchdog of how prices will be cut.
Smaller importers of items such as refrigerators, cars and air conditioners will not be affected.
The government said the changes will clarify who is covered and how business can pass on the savings.
The bills are expected in the Senate on Tuesday, Mr Hunt later added on Twitter.
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