Sinn Féin has proposed a package of €6.8 billion in its alternative 2024 Budget.
The party said it would deliver €1.35bn in cost-of-living measures to give households certainty this winter.
This includes a cut to the price at which electricity suppliers can charge households.
The change would keep prices at pre-crisis levels until April at a cost of €642m.
The party would extend the reduced excise duty rate for petrol and diesel and it would scrap the carbon tax increase planned for October.
The spending plan proposes up to €1,500 in targeted temporary mortgage interest relief for households worst hit by European Central Bank rate hikes.
It would provide a double Christmas child benefit payment along with a doubling of Christmas welfare and pension payments.
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Targetting energy suppliers
Sinn Féin's Spokesperson on Finance Pearse Doherty said the party's alternative budget was framed without an increase in carbon tax as this would hurt families and workers.
Speaking on RTÉ's Morning Ireland, he said: "And that investment for the future, a large part of that is actually on the issues of climate change."
In relation to household electricity bills, Mr Doherty said his party is proposing reducing the price that suppliers can charge, and then reimbursing suppliers, which is "the approach that's used in most countries across Europe."
He said Germany and the Netherlands, and many other countries across Europe use this approach and have reduced tariffs for consumers.
On a plan for targeted mortgage interest relief, Mr Doherty said all mortgage holders who have seen an increase in their mortgage interest would be able to benefit from this.
"It is costed by the independent Parliamentary Budget Office and we know from the Central Bank, 40% of households are paying €3,000 more in mortgage interest than they were this time last year, 20% of them paying €5,700 and the Government is coming up with nothing," Mr Doherty said.
Speaking on RTÉ's Drivetime this evening, Sinn Féin's spokesperson on Public Expenditure Rose Conway Walsh added: "Our number one priority is housing, as was said today, and after housing and health that is climate action is one of our biggest areas of investment.
"We absolutely need to make life more affordable in the soaring cost of living. At the moment, so many things are totally unaffordable."
Also speaking on RTÉ's Drivetime, Fine Gael's Peter Burke, Minister of State with responsibility for EU Affairs and Defence, described the Sinn Féin proposals as a "bogus budget" and "cuckoo-land economics".
"Sinn Féin are proposing to double Stamp Duty on your average house is what it looks like to me, raise it up to 2%," he said.
"They are also removing the Help to Buy scheme, which helped 40,000 families get their first home."
Ms Conway Walsh said the Help to Buy scheme was not the best way to allocate resources in a housing emergency.
"We also know that 30% of people who avail of it do not need it at all," she said.
"We also think that adds to inflation in the cost of housing, so if we are driving house prices further and further all the time we see what they have increased in the last 12 years, we are making it unaffordable for the vast majority of the population, and that is why that young people are cramming in and living with parents."
€1 off-peak public transport fare under Soc Dem proposal
Meanwhile, Social Democrats have proposed a €5 billion fund to invest in renewable energy to address the challenges posed by climate transformation.
In its alternative Budget, the party said it would introduce a €1 off-peak fare for public transport.
It is also calling for a €25 hike in core welfare rates and wants to increase targeted payments to vulnerable children by 30%.
It would increase the minimum wage by €2 to €13.30 an hour and wants to introduce a "cost of disability payment "of €30 a week.
Meanwhile, the Rural Independent Group of TDs is seeking an increase to the carer's grant of €650.
The group said it would increase welfare payments by €30 a week and households would receive an energy credit of €600 this winter.
It wants a review of the pay of ministerial advisers to potentially save €2 million annually.
The RIG would redistribute the TV licence fee to all broadcasters, including local radio stations, and it will push for a referendum on the future of public service broadcasting.
