So, will net zero really cost $9 trillion to Australia?
In a word: no.
The figure, now commonly cited by right-wing outlets like the IPA, originally came from a 2023 report from Net Zero Australia, a partnership of three universities that conducts research into net zero pathways.
Their 2023 study did say that achieving net zero required Australia to “attract and invest $7-9 trillion of capital to 2060 from international and domestic sources”. But it is nonsensical to use this number in the way Littleproud has, for three main reasons:
1. This is total capital investment, not government spending
The $7-9 trillion is the total of all the money invested my private companies building wind farms, homeowners installing rooftop solar, and someone switching to an electric vehicle when they’re due for an upgrade.
This money is also an investment, so Australia will get trillions of dollars worth of assets out the other end.
It’s pretty misleading to pretend this will cost government budgets $9 trillion, so net zero will not, as Littleproud claimed, “put things like Medicare at risk”.
2. Net cost not gross cost
The $7-9 trillion figure is only the “cost” of net zero if the alternative is zero spending on energy infrastructure, by anyone. That would mean no spending on energy generation, power lines, or even cars (including petrol) – not a realistic scenario.
Perhaps realising that their $7-9 trillion figure was easy to use in bad faith by those opposed to renewable energy, Net Zero Australia updated the figure in their 2025 report. Accounting for the capital costs of doing nothing, they now estimate that “$1.6 trillion capital investment must be unlocked to achieve net zero by 2050”. This is a fraction of the number Littleproud has been using.
According to the 2025 figure, Australia would only need an additional $64 billion in investment per year – an eminently achievable task in a country with a $1.8 trillion GDP and $735 billion government revenue annually.
3. It does not account for the costs of unmitigated climate change
Even this price tag does not take into account the costs of inaction, such as managing climate disasters. The National Climate Risk Assessment released earlier this year estimated that increased natural disasters alone would cost the Government $40 billion dollars annually.
Verdict: Gross misrepresentation.
You can read the full fact-check here.