Fourteen years. That is the shortest credible timeline any serious analyst has put on a first Australian nuclear reactor reaching commercial operation, and even that figure assumes a regulatory framework that does not yet exist, a workforce that has not been trained, and a site that has not been selected. The Coalition’s nuclear policy, taken seriously on its own terms, is a 2038-at-the-absolute-earliest proposition for a grid that AEMO’s own Integrated System Plan has already blueprinted out to 2050 without one.
So: does Australia actually need nuclear power?
The honest read is that the question is genuinely harder than either side admits, and both sides are being dishonest in their own particular way.
What the Coalition’s plan actually proposes #
The Opposition’s nuclear policy — detailed enough that we’ve spent real time pulling it apart here at Energy Supply Australia — centres on seven sites, most of them at or near retiring coal stations. The logic is not stupid: existing grid connections, cooling water, and communities that have lived beside large power infrastructure for decades. You can see why it appeals as a map.
The cost figures, though, are where it gets uncomfortable. The Coalition cited capital costs from American and South Korean reference builds that have not been replicated anywhere in the Anglophone world at those price points. The UK’s Hinkley Point C, which is arguably the closest comparable, has blown through its original estimates several times over. South Korea’s domestic programme is genuinely cheaper — but South Korea has built reactors continuously for forty years and has a domestic supply chain that Australia simply does not have. Citing Kepco costs for an Australian programme is like quoting Ikea flatpack prices for bespoke joinery. It’s the same raw material; the labour context is completely different.
What the renewables-plus-storage case actually requires #
The other side of the ledger deserves the same scrutiny, and this is where I’ll admit the consensus frustrates me.
The standard pro-renewables argument — that solar, wind, and storage can do the whole job — tends to wave past the firming problem with an ease that the engineering does not quite justify. AEMO has been candid, in its published ISP work, that the transition requires massive investment in transmission, dispatchable capacity, and long-duration storage. The pumped hydro versus batteries debate is not settled. Snowy 2.0 is years behind schedule and significantly over its original budget. That matters.
Offshore wind, which features heavily in the long-term capacity mix, is not yet commercially deployed in Australian waters. The fixed-bottom versus floating question is still being worked through; we’ve covered that in some depth. Queensland’s pumped hydro ambitions are politically appealing but operationally complex. None of this means the renewables pathway fails — I don’t think it does — but the people telling you it’s a solved problem are running ahead of the evidence.
The actual case for nuclear (it’s not the one you hear most often) #
Here’s the argument for nuclear that I think deserves a fair hearing, and that gets less airtime than the political theatre around it.
Australia’s grid is dealing with an accelerating rooftop solar problem. Rooftop penetration is extraordinary by global standards — genuinely world-leading — and it is pushing midday wholesale prices toward zero and sometimes negative. That is good for consumers on a sunny Tuesday in October. It is a different story for the economics of any large, capital-intensive generator that needs to run continuously to recover its fixed costs. Coal plant retirements are being pulled forward precisely because the revenue stack no longer works. Gas peakers are increasingly the marginal setter at the edges of the day.
Nuclear, if it could be built at scale, would address a specific and real problem: the need for large, zero-carbon, weather-independent baseload that can earn revenue in a market that increasingly doesn’t value midday electrons. The argument isn’t ‘nuclear instead of renewables.’ The serious version of the argument is ‘nuclear alongside renewables, as the dispatchable backbone that lets you run very high renewable penetration without needing heroic amounts of long-duration storage.’
That is actually a coherent grid design argument. I’d take it more seriously if the people making it were also supporting the transmission investment and storage build that would be needed in the interim decade-plus before a single reactor comes online. They mostly aren’t.
Follow the money #
Follow the money, and the nuclear debate looks a little different again.
The Capacity Investment Scheme — which we’ve argued is already picking winners in ways the market won’t necessarily thank us for — has been directing revenue support toward renewables and storage projects. That’s a policy choice with real distributional consequences. If you’re an investor who missed the CIS allocation rounds, or a company whose gas peaker is being slowly strangled by cannibalised margins, the nuclear conversation becomes attractive not because of the physics but because it represents a political lever to slow the transition and protect incumbent positions.
I am not saying that’s the only motivation behind nuclear advocacy. It isn’t. But the honest read is that some of the corporate enthusiasm for ‘keeping nuclear on the table’ is less about grid reliability and more about regulatory uncertainty as a business strategy. Sowing doubt about whether the renewables pathway will work keeps optionality open. It’s a play the fossil fuel sector has run before, in different forms.
Small modular reactors: the wildcard #
The small modular reactor case deserves a separate paragraph because it’s different in kind from the large-reactor argument.
SMRs are not yet commercially deployed anywhere in the world at scale. The NuScale project in the United States — the furthest along of the Western SMR programmes — was cancelled in late 2023 after cost estimates rose well past the point of economic viability for its prospective utility buyers. That’s history now, and the position has moved on; other programmes continue, including efforts in Canada and the UK. But anyone telling you SMRs are ‘almost ready’ should be required to name a commercial reference plant and a levelised cost. As of now, neither exists.
That doesn’t mean SMRs will never work. It means they are a genuine mid-2030s-to-2040s bet at the earliest, and Australia betting on them as a near-term solution is punting on a technology that is, to put it plainly, not there yet.
The question the debate keeps avoiding #
Here is what I think both camps consistently avoid saying out loud: Australia’s energy transition is going to be expensive, lumpy, and politically uncomfortable regardless of the generation technology mix. The people promising you a smooth, cheap, fully-renewable grid by 2035 are glossing over the firming costs and the transmission bill. The people promising you affordable, reliable nuclear by 2038 are glossing over the regulatory lead times, the workforce gap, and the capital cost uncertainty.
The AEMO Integrated System Plan is the closest thing we have to an honest national accounting of what the grid actually needs. It is not a political document; it is an engineering one. And its answer — more transmission, more storage, more offshore wind, more demand flexibility — does not include nuclear, not because of ideology but because the timeline and cost arithmetic don’t resolve in nuclear’s favour before the coal fleet retires.
That said, the ISP is a twenty-year plan in a sector where technology costs have repeatedly surprised even the most sophisticated modellers. Ruling nuclear out permanently is as intellectually overconfident as ruling it in. The Energy and Climate Change Ministerial Council has a role here in setting a long-term framework that doesn’t foreclose options it may want in twenty years.
My own read, for what it’s worth: Australia does not need nuclear to hit net zero by 2050, and the Coalition’s specific plan as it stood before the last election had enough cost and timeline problems that it would have struggled to survive contact with Treasury. But the grid in 2040, running at 90-plus percent renewables with the fossil backstop largely gone, may well benefit from a technology that provides continuous, dispatchable, zero-carbon output. Whether that technology is nuclear, or very long-duration storage, or something else we haven’t yet deployed at scale, is a genuinely open question.
Anyone who tells you it’s already settled — in either direction — is selling you something. In my experience, the Australian energy market has an excellent record of humbling confident predictions. Ask anyone who modelled battery costs in 2015.
— Marcus Wren, Editor