You pay for it.

There is - arguably a case for nuclear power in cold miserable places like Canada or Northern Europe because solar - by far the cheapest form of renewable energy, and still with a substantial runway to get cheaper - produces the least amount of energy precisely when those places need it most.

Australia, being a warm, sunny place, has far less seasonal variation in solar production, and at worst bas a grid that needs roughly the same amount of energy in winter and summer peaks.

Even in a net zero scenario things like running a gas turbine on biomethane or synthesised hydrogen for that last few percent of demand will make more economic sense than building nuclear in Australia.

If someone figures how to churn out SMRs for $3.95 each, sure, that would change matters, but that remains a hypothetical possibility that Australia does not have to plan around.