The nuclear industry has been offering so-called Small Modular Reactors (SMRs) as an alternative to large reactors as a possible solution to climate change.
Small Modular Reactors are defined as nuclear reactors with a power output of less than 300 megawatts of electricity, compared to the typically 1000 to 1,500 megawatts power capacity of larger reactors.
Proponents assert that Small Modular Reactors would cost less to build and thus be more affordable.
However, when evaluated on the basis of cost per unit of power capacity, SMRs will actually be more expensive than large reactors.
This “diseconomy of scale” was demonstrated by the now-terminated proposal to build six NuScale Power SMRs (77 megawatts each) in Idaho in the United States.
The final cost estimate of the project per megawatt was around 250% more than the initial per megawatt cost for the 2,200 megawatts Vogtle nuclear power plant being built in Georgia, US.
Previous small reactors built in various parts of America also shut down because they were uneconomical.
The high cost of constructing Small Modular Reactors on a per megawatt basis translates into high electricity production costs.
According to the 2023 GenCost report from the Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Energy Market Operator, the estimated cost of generating each megawatt-hour of electricity from an SMR is around AUD$400 to AUD$600.
In comparison, the cost of each megawatt-hour of electricity from wind and solar photovoltaic plants is around AUD$100, even after accounting for the cost involved in balancing the variability of output from solar and wind plants.
Building SMRs has also been subject to delays. Russia’s KLT-40 took 13 years from when construction started to when it started generating electricity, instead of the expected three years.
Small Modular Reactors also raise all of the usual concerns associated with nuclear power, including the risk of severe accidents, the linkage to nuclear weapons proliferation, and the production of radioactive waste that has no demonstrated solution because of technical and social challenges.
One 2022 study calculated that various radioactive waste streams from SMRs would be larger than the corresponding waste streams from existing light water reactors.
The bottom line is that new reactor designs, such as SMRs, will not rescue nuclear power from its multiple problems. Any energy technology that is beset with such environmental problems and risks cannot be termed sustainable.
Nuclear energy itself has been declining in importance as a source of power: the fraction of the world’s electricity supplied by nuclear reactors has declined from a maximum of 17.5% in 1996 down to 9.2% in 2022. All indications suggest that the trend will continue if not accelerate.
The decline in the global share of nuclear power is driven by poor economics: generating power with nuclear reactors is costly compared to other low-carbon, renewable sources of energy and the difference between these costs is widening.
Nuclear reactors built during the last decade have all demonstrated a pattern of cost and time overruns in their construction.
The Vogtle nuclear power plant being built in Georgia, involving two reactors designed to generate around 1,100 megawatts of electricity each, is currently estimated to cost nearly USD$35 billion.
In 2011, when the utility company building the reactor sought permission from the American Nuclear Regulatory Commission, it projected a total cost of USD$14 billion, and "in-service dates of 2016 and 2017" for the two units.
In France, the 1,630-megawatt European Pressurised Reactor being built in Flamanville was originally estimated to cost 3 billion euros and projected to start in 2012, but the cost has soared to an estimated 13.2 billion euros and is yet to start operating as of March 2024.
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These cost increases and delays confirm the historical pattern identified in a study published in 2014: of the 180 nuclear power projects around the world it studied, 175 had exceeded their initial budgets, by an average of 117 percent, and took 64 percent longer than initially projected.
However, the recent projects are even more extreme in the magnitude of the disconnect between expectations and reality.
These reactor projects, and the Hinkley Point C project under construction in the United Kingdom, also confirm another historical pattern: costs of nuclear power plants go up with time, not down. This is unlike other energy technologies, such as solar and wind energy, where costs have declined rapidly with experience.
The climate crisis is urgent. The world has neither the financial resources nor the luxury of time to expand nuclear power. As physicist and energy analyst Amory Lovins argued: “... to protect the climate, we must save the most carbon at the least cost and in the least time.”
Expanding nuclear energy only makes the climate problem worse.
The money invested in nuclear energy would save far more carbon dioxide if it were instead invested in renewables.
And the reduction in emissions from investing in renewables would be far quicker.
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This article was originally published by 360info™.
Editor’s Note: The opinions expressed here by the authors are their own, not those of Impakter.com — Cover Photo Credit: Michael Joiner/360info.
