Nuclear power struggling to maintain current level of stagnation, let alone achieve any growth

The current push in Australia to deploy nuclear power reactors once again contrasts an excessive optimism by nuclear proponents against the continuing stagnant situation of nuclear power worldwide. That contrast is the subject of our new report for the EnergyScience Coalition.

The latest nuclear proposals are built on three speculations. 

First, projected AI-related energy demand where – as with nuclear power proponents in the 1970’s who projected huge demand that never eventuated – there are already signs demand is overblown. For example the new leading AI entrant DeepSeek requires just 10 per cent of the energy of competitors.

Second, speculative techno-optimism that new technologies such as small modular reactors will resolve industry project management issues. Yet these small reactors are unproven. 

Third, prospective wish-fulfilment, where dozens of nuclear ‘newcomer’ countries are offered as saviours, despite not having reactor approvals and funding in place in a large majority of cases.

So what is the state of nuclear power in 2024? A review by the World Nuclear Industry Status Report notes that seven new reactors were connected to grids last year while four reactors were permanently closed. The net increase in operating nuclear capacity was 4.3 gigawatts (GW).

Worldwide nuclear power capacity was 371 gigawatts (GW) at the end of 2024. That figure is near-identical to capacity of 368 GW two decades earlier in 2005.

As of 1 January 2025, the mean age of the nuclear power reactor fleet was 32.1 years. In 1990, the mean age was just 11.3 years. Due to the ageing of the reactor fleet, the International Atomic Energy Agency projects the closure of 325 GW of nuclear capacity from 2018 to 2050 – that’s 88 per cent of current worldwide capacity. Thus the industry faces a daunting challenge just to maintain its pattern of stagnation, let alone achieve any growth.

There were no ‘small modular reactor’ (SMR) startups in 2024. Indeed there has never been a single SMR startup unless you count so-called SMRs not built using factory ‘modular’ construction techniques, in which case there is one each in China and Russia.

The SMR sector continues to go nowhere with setbacks in 2024 including the suspension of the Nuward project in France (following previous decisions to abandon four other SMR projects) and the bankruptcy of US company Ultra Safe Nuclear. 

Nuclear growth dwarfed by renewables

In striking contrast to nuclear power’s net gain of 4.3 GW in 2024, the International Energy Agency’s October 2024 ‘Renewables 2024’ report estimates 666 GW of global renewable capacity additions in 2024. Based on the Agency’s estimate, renewables capacity growth was 155 times greater than that of nuclear power.

The International Energy Agency expects renewables to jump sharply from 30 per cent of global electricity generation in 2023 to 46 per cent in 2030.

Conversely, nuclear power’s share of global electricity generation has fallen steadily since the 1990s. As of 1 January 2025, nuclear power accounted for 9.15 per cent of global electricity production, barely half of its peak of 17.5 per cent in 1996.

A Bloomberg analysis finds that renewable energy investments reached $A1.17 trillion in 2024, up 8 per cent on the previous year, whereas nuclear investment was flat at $A55.1 billion. Thus renewable investments were 21 times greater than nuclear investments.

In contrast to massive cost overruns with nuclear projects, renewable costs have fallen sharply.

Lazard investment firm data shows that utility-scale solar and onshore wind became cheaper than nuclear power from 2010-2015. From 2009-2024, the cost of utility-scale solar fell 83 per cent; the cost of onshore wind fell 63 per cent; while nuclear costs increased 49 per cent.

Nuclear newcomer countries

Claims that 40-50 countries are actively considering or planning to introduce nuclear power, in addition to the 32 countries currently operating reactors, do not withstand scrutiny.

As of 1 January 2025, reactors were under construction in just 13 countries, two less than a year earlier. Seven percent of the world’s countries are building reactors; 93 percent are not.

Of the 13 countries building reactors, only three are potential nuclear newcomer countries building their first plant: Egypt, Bangladesh and Turkiye. In those three countries, the nuclear projects are led by Russian nuclear agencies with significant up-front funding from the Russian state.

The World Nuclear Association observes that apart from those three countries, no countries meet its criteria of ‘planned’ reactors, i.e. “approvals, funding or commitment in place, mostly expected to be in operation within the next 15 years.”

The number of potential newcomer countries with approvals and funding in place, or construction underway, is just three and those projects are funded heavily by the Russian state. That is the underwhelming reality underlying exaggerated claims about 40-50 countries pursuing nuclear power.

There is no evidence of a forthcoming wave of nuclear newcomer countries in the coming years and decades. At most there will be a trickle as has been the historical pattern with just seven newcomer countries over the past 40 years and just three this century.

The number of countries operating power reactors in 1996–1997 reached 32. Since then, nuclear newcomer countries have been matched by countries completing nuclear phase-outs and thus the number is stuck at 32. And less than one-third of those countries are building reactors (10/32).

It is doubtful whether the number of nuclear newcomer countries over the next 20-30 years will match the number of countries completing phase-outs.

Capital strike

Alongside the risk of Fukushima-scale disasters, the weapons proliferation risks, the risk of attacks on nuclear plants (and the reality of attacks on nuclear plants in Ukraine), and the intractable nuclear waste legacy, the reality is that nuclear power just can’t compete economically.

The industry’s greatest problem at the moment is a recognition of this by investors, resulting in a capital strike. Even with generous government/taxpayer subsidies, it has become difficult or impossible to fund new reactors – especially outside the sphere of China and Russia’s projects at home and abroad.

Who would bet tens of billions of dollars on nuclear power projects when the recent history in countries with vast expertise and experience has been disastrous?

In France, the latest cost estimate for the only recent reactor construction project increased seven-fold to A$39.4 billion for just one reactor. Construction took 17 years. No reactors are currently under construction in France.

In the US, one project in South Carolina, comprising two Westinghouse AP1000 reactors, was abandoned in 2017 after $A14.3 billion was spent. Westinghouse declared bankruptcy and its debts almost forced its parent company Toshiba into bankruptcy. All that remains is the nukegate scandal: an avalanche of legal action including criminal cases.

The only other reactor construction project in the US – the twin-reactor Vogtle project in the state of Georgia – reached completion at a cost 12 times higher than early estimates. The final cost was at least $A27 billion per reactor. Completion was six to seven years behind schedule.

No power reactors are currently under construction in the US. Thirteen reactors have been permanently shut down over the past 15 years.

The situation is just as bleak in the UK where there have been 24 permanent reactor shut-downs since the last reactor startup 30 years ago, in 1995.

The 3.2 GW twin-reactor Hinkley Point project in Somerset was meant to be complete in 2017 but construction didn’t even begin until 2018 and the estimated completion date has been pushed back to 2030-31.

The latest cost estimate – A$46.6 billion per reactor – is 11.5 times higher than early estimates. The UK National Audit Office estimates that taxpayer subsidies for the Hinkley Point project could amount to $A60.8 billion and the UK Parliament’s Public Accounts Committee said that “consumers are left footing the bill and the poorest consumers will be hit hardest.”

The estimated cost of the planned 3.2 GW twin-reactor Sizewell C project in the UK has jumped to $A81 billion or $A40.5 billion per reactor, twice the cost estimate in 2020. Securing funding to allow construction to begin is proving to be difficult and protracted despite a new ‘Regulated Asset Base’ funding model which foists the enormous risk of enormous cost overruns onto taxpayers and electricity ratepayers.

Lessons for Australia

Those three countries – France, the US and the UK – have vast nuclear expertise and experience. They all enjoy synergies between civil and military nuclear programs – President Macron said in a 2020 speech that without nuclear power in France there would be no nuclear weapons, and vice versa.

All of the above-mentioned construction projects were (or are) on existing nuclear sites. All projects were (or are) long delayed and tens of billions of dollars over-budget.

Claims that potential nuclear newcomer countries such as Australia, without any of those advantages, could build reactors quickly and cheaply are not credible.

Our report expanding on these issues is posted at the EnergyScience Coalition website.

Darrin Durant is Associate Professor in Science and Technology Studies at the University of Melbourne. Jim Falk is a Professorial Fellow in the School of Geography, Earth and Atmospheric Sciences at the University of Melbourne and Emeritus Professor at the University of Wollongong. Dr. Jim Green is the national nuclear campaigner with Friends of the Earth Australia and a member of the Nuclear Consulting Group.