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Daily news & progressive opinion—funded by the people, not the corporations—delivered straight to your inbox.
We pay it in rising energy bills, our worsening climate, our lack of access to safe water, increased noise pollution, and risks to our health and safety.
Bill Gates recently made headlines by suggesting that climate change is no longer a priority, but the American public begs to differ.
In this last election, climate change was a defining issue in states like Virginia and Georgia, where voters grappled with rising energy costs. And no matter how much tech billionaires try to distract us, increasing power costs and our worsening climate are directly connected to corporations like Google, Meta, Microsoft, and Amazon racing to dominate the AI landscape.
According to the U.S. Energy Information Administration, the price of energy has risen at more than twice the rate of inflation since 2020, and Big Tech’s push for more power-hungry data centers is only making it worse.
The data centers proliferating across the country drive up energy costs by powering energy-ravenous generative AI, cloud storage, digital networks, and other energy intensive programs—much of it fueled by coal and natural gas that exacerbate climate change.
We can demand that tech giants like Microsoft, Meta, Google, and Amazon uphold their commitments to use 100% renewable energy and not rely on fossil fuels and nuclear energy to power data centers.
In some cases, data centers consume enough electricity to power the equivalent of a small city. The wholesale price of electricity in areas housing data centers is up a whopping 267% from five years ago—and everyday customers are eating those costs.
Americans are also shouldering increasing costs of an extreme climate.
The Joint Center for Housing Studies at Harvard noted that insurance prices rose 74% between 2008 and 2024—and between 2018 and 2023, nearly 2 million people had their policies canceled by insurers because of climate risks.
Meanwhile, home prices have gone up 40% in the past two decades—meaning the cost of home repair and recovery from climate disasters has also grown, all while wages remain stagnant.
Data centers aren’t just putting our wallets at risk. Power grids across the country are already strained from aging infrastructure and repeated battering during extreme weather events.
The additional pressure to feed energy-intensive data centers only heightens the risk of power blackouts in emergencies like wildfires, deep freezes, and hurricanes. And in some communities, people’s taps have literally run dry because data centers used all the local groundwater.
Worse still, Big Tech’s AI energy demand has triggered a resurgence in dirty energy with the construction of new gas-powered energy plants and delayed shutdowns of fossil fuel-powered plants. The tech industry is even pushing for a revitalization of nuclear energy, including the planned 2028 reopening of Three Mile Island—site of the worst nuclear power plant disaster in US history—to help power Microsoft’s data centers.
Everyday people bear the costs of Big Tech’s hunger for profits. We pay it in rising energy bills, our worsening climate, our lack of access to safe water, increased noise pollution, and risks to our health and safety.
It doesn’t have to be this way. Instead of raising our bills, draining our local resources, and destabilizing our climate, Big Tech could create more energy jobs, lessen our power bills, and sustain communities.
We can demand that tech giants like Microsoft, Meta, Google, and Amazon uphold their commitments to use 100% renewable energy and not rely on fossil fuels and nuclear energy to power data centers. We can insist that data centers only go where they’re wanted by ensuring communities are given full transparency and protection in how they’re affected by power usage, water access, and noise pollution.
The current administration is ignoring its obligations to the American public by refusing to rein in Big Tech. But tech billionaires still have a responsibility to the very public they depend on for their existence.
"Such attacks have serious implications for nuclear safety, security, and safeguards, as well as regional and international peace and security," said the director-general of the International Atomic Energy Agency.
The head of the International Atomic Energy Agency issued a grave warning about the potentially catastrophic environmental and human impacts of military attacks on nuclear facilities after Israel launched a massive assault on Iran's nuclear energy infrastructure, reportedly damaging the country's largest uranium enrichment site.
"This development is deeply concerning," said IAEA Director-General Rafael Grossi. "I have repeatedly stated that nuclear facilities must never be attacked, regardless of the context or circumstances, as it could harm both people and the environment. Such attacks have serious implications for nuclear safety, security, and safeguards, as well as regional and international peace and security."
Grossi pointed to the IAEA's longstanding position that "armed attacks on nuclear facilities could result in radioactive releases with grave consequences within and beyond the boundaries of the State which has been attacked."
As of Friday afternoon local time, Iranian officials said radiation levels were not elevated at the Natanz enrichment site, according to Grossi. Iranian officials also said the country's Esfahan and Fordow nuclear sites were not affected by Israel's attacks.
"Despite the current military actions and heightened tensions," Grossi said Friday, "it is clear that the only sustainable path forward—for Iran, for Israel, the entire region, and the international community—is one grounded in dialogue and diplomacy to ensure peace, stability, and cooperation."
"Israel's bombing of Iran's nuclear facilities is a dangerous escalation from a nuclear-armed state that threatens to thwart negotiations on the Iranian nuclear program."
Israel's deadly attack on Iran came a day after the IAEA Board of Governors approved a U.S.-backed resolution accusing Iran of not complying with its commitments to international nuclear safeguards.
Iran responded furiously to the resolution's passage, saying it "has no choice but to respond to this politically motivated resolution" and announcing a "new enrichment facility in a secure location."
Contrary to the Israeli government's claim that Iran is racing toward a nuclear weapon, U.S. intelligence agencies have maintained that Iran is not building an atomic bomb—an assessment consistent with Iran's repeated public statements that its nuclear program is for civilian energy purposes only.
Following Israel's attack, Iran—which is not a member of the IAEA board—requested that the United Nations agency hold an emergency meeting to discuss the Israeli strikes. Reuters reported that board members Russia, China, and Venezuela supported the request for a meeting.
Melissa Parke, executive director of the Nobel Peace Prize-winning International Campaign to Abolish Nuclear Weapons, said in a statement Friday that "Israel's bombing of Iran's nuclear facilities is a dangerous escalation from a nuclear-armed state that threatens to thwart negotiations on the Iranian nuclear program."
"Israel and Iran must join the U.N. Treaty on the Prohibition of Nuclear Weapons without delay," said Parke. "This would require Israel to dismantle its nuclear weapons program and Iran to maintain its current nuclear safeguards framework under IAEA oversight. It is only through broad-based negotiated solutions that we can truly end the threat from nuclear weapons by agreeing to their total elimination."
SMRs may have a role to play in our energy future, but only if they are sufficiently safe and secure; for that to happen, it is essential to have a realistic understanding of their costs and risks.
Even casual followers of energy and climate issues have probably heard about the alleged wonders of small modular nuclear reactors, or SMRs. This is due in no small part to the “nuclear bros”: an active and seemingly tireless group of nuclear power advocates who dominate social media discussions on energy by promoting SMRs and other “advanced” nuclear technologies as the only real solution for the climate crisis. But as I showed in my 2013 and 2021 reports, the hype surrounding SMRs is way overblown, and my conclusions remain valid today.
Unfortunately, much of this SMR happy talk is rooted in misinformation, which always brings me back to the same question: If the nuclear bros have such a great SMR story to tell, why do they have to exaggerate so much?
SMRs are nuclear reactors that are “small” (defined as 300 megawatts of electrical power or less), can be largely assembled in a centralized facility, and would be installed in a modular fashion at power generation sites. Some proposed SMRs are so tiny (20 megawatts or less) that they are called “micro” reactors. SMRs are distinct from today’s conventional nuclear plants, which are typically around 1,000 megawatts and were largely custom-built. Some SMR designs, such as NuScale, are modified versions of operating water-cooled reactors, while others are radically different designs that use coolants other than water, such as liquid sodium, helium gas, or even molten salts.
To date, however, theoretical interest in SMRs has not translated into many actual reactor orders. The only SMR currently under construction is in China. And in the United States, only one company—TerraPower, founded by Microsoft’s Bill Gates—has applied to the Nuclear Regulatory Commission (NRC) for a permit to build a power reactor (but at 345 megawatts, it technically isn’t even an SMR).
The nuclear industry has pinned its hopes on SMRs primarily because some recent large reactor projects, including Vogtle units 3 and 4 in the state of Georgia, have taken far longer to build and cost far more than originally projected. The failure of these projects to come in on time and under budget undermines arguments that modern nuclear power plants can overcome the problems that have plagued the nuclear industry in the past.
Regulators are loosening safety and security requirements for SMRs in ways which could cancel out any safety benefits from passive features.
Developers in the industry and the U.S. Department of Energy say that SMRs can be less costly and quicker to build than large reactors and that their modular nature makes it easier to balance power supply and demand. They also argue that reactors in a variety of sizes would be useful for a range of applications beyond grid-scale electrical power, including providing process heat to industrial plants and power to data centers, cryptocurrency mining operations, petrochemical production, and even electrical vehicle charging stations.
Here are five facts about SMRs that the nuclear industry and the “nuclear bros” who push its message don’t want you, the public, to know.
In theory, small reactors should have lower capital costs and construction times than large reactors of similar design so that utilities (or other users) can get financing more cheaply and deploy them more flexibly. But that doesn’t mean small reactors will be more economical than large ones. In fact, the opposite usually will be true. What matters more when comparing the economics of different power sources is the cost to produce a kilowatt-hour of electricity, and that depends on the capital cost per kilowatt of generating capacity, as well as the costs of operations, maintenance, fuel, and other factors.
According to the economies of scale principle, smaller reactors will in general produce more expensive electricity than larger ones. For example, the now-cancelled project by NuScale to build a 460-megawatt, 6-unit SMR in Idaho was estimated to cost over $20,000 per kilowatt, which is greater than the actual cost of the Vogtle large reactor project of over $15,000 per kilowatt. This cost penalty can be offset only by radical changes in the way reactors are designed, built, and operated.
For example, SMR developers claim they can slash capital cost per kilowatt by achieving efficiency through the mass production of identical units in factories. However, studies find that such cost reductions typically would not exceed about 30%. In addition, dozens of units would have to be produced before manufacturers could learn how to make their processes more efficient and achieve those capital cost reductions, meaning that the first reactors of a given design will be unavoidably expensive and will require large government or ratepayer subsidies to get built. Getting past this obstacle has proven to be one of the main impediments to SMR deployment.
The levelized cost of electricity for the now-cancelled NuScale project was estimated at around $119 per megawatt-hour (without federal subsidies), whereas land-based wind and utility-scale solar now cost below $40/MWh.
Another way that SMR developers try to reduce capital cost is by reducing or eliminating many of the safety features required for operating reactors that provide multiple layers of protection, such as a robust, reinforced concrete containment structure, motor-driven emergency pumps, and rigorous quality assurance standards for backup safety equipment such as power supplies. But these changes so far haven’t had much of an impact on the overall cost—just look at NuScale.
In addition to capital cost, operation and maintenance (O&M) costs will also have to be significantly reduced to improve the competitiveness of SMRs. However, some operating expenses, such as the security needed to protect against terrorist attacks, would not normally be sensitive to reactor size. The relative contribution of O&M and fuel costs to the price per megawatt-hour varies a lot among designs and project details, but could be 50% or more, depending on factors such as interest rates that influence the total capital cost.
Economies of scale considerations have already led some SMR vendors, such as NuScale and Holtec, to roughly double module sizes from their original designs. The Oklo, Inc. Aurora microreactor has increased from 1.5 MW to 15 MW and may even go to 50 MW. And the General Electric-Hitachi BWRX-300 and Westinghouse AP300 are both starting out at the upper limit of what is considered an SMR.
Overall, these changes might be sufficient to make some SMRs cost-competitive with large reactors, but they would still have a long way to go to compete with renewable technologies. The levelized cost of electricity for the now-cancelled NuScale project was estimated at around $119 per megawatt-hour (without federal subsidies), whereas land-based wind and utility-scale solar now cost below $40/MWh.
Microreactors, however, are likely to remain expensive under any realistic scenario, with projected levelized electricity costs two to three times that of larger SMRs.
Because of their size, you might think that small nuclear reactors pose lower risks to public health and the environment than large reactors. After all, the amount of radioactive material in the core and available to be released in an accident is smaller. And smaller reactors produce heat at lower rates than large reactors, which could make them easier to cool during an accident, perhaps even by passive means—that is, without the need for electrically powered coolant pumps or operator actions.
However, the so-called passive safety features that SMR proponents like to cite may not always work, especially during extreme events such as large earthquakes, major flooding, or wildfires that can degrade the environmental conditions under which they are designed to operate. And in some cases, passive features can actually make accidents worse: For example, the NRC’s review of the NuScale design revealed that passive emergency systems could deplete cooling water of boron, which is needed to keep the reactor safely shut down after an accident.
In any event, regulators are loosening safety and security requirements for SMRs in ways which could cancel out any safety benefits from passive features. For example, the NRC has approved rules and procedures in recent years that provide regulatory pathways for exempting new reactors, including SMRs, from many of the protective measures that it requires for operating plants, such as a physical containment structure, an offsite emergency evacuation plan, and an exclusion zone that separates the plant from densely populated areas. It is also considering further changes that could allow SMRs to reduce the numbers of armed security personnel to protect them from terrorist attacks and highly trained operators to run them. Reducing security at SMRs is particularly worrisome, because even the safest reactors could effectively become dangerous radiological weapons if they are sabotaged by skilled attackers. Even passive safety mechanisms could be deliberately disabled.
Considering the cumulative impact of all these changes, SMRs could be as—or even more— dangerous than large reactors. For example, if a containment structure at a large reactor reliably prevented 90% of the radioactive material from being released from the core of the reactor during a meltdown, then a reactor five times smaller without such a containment structure could conceivably release more radioactive material into the environment, even though the total amount of material in the core would be smaller. And if the SMR were located closer to populated areas with no offsite emergency planning, more people could be exposed to dangerously high levels of radiation.
But even if one could show that the overall safety risk of a small reactor was lower than that of a large reactor, that still wouldn’t automatically imply the overall risk per unit of electricity that it generates is lower, since smaller plants generate less electricity. If an accident caused a 250-megawatt SMR to release only 25% of the radioactive material that a 1,000-megawatt plant would release, the ratio of risk to benefit would be the same. And a site with four such reactors could have four times the annual risk of a single unit, or an even greater risk if an accident at one reactor were to damage the others, as happened during the 2011 Fukushima Daiichi accident in Japan.
The industry makes highly misleading claims that certain SMRs will reduce the intractable problem of long-lived radioactive waste management by generating less waste, or even by “recycling” their own wastes or those generated by other reactors.
First, it’s necessary to define what “less” waste really means. In terms of the quantity of highly radioactive isotopes that result when atomic nuclei are fissioned and release energy, small reactors will produce just as much as large reactors per unit of heat generated. (Non-light-water reactors that more efficiently convert heat to electricity than light-water reactors will produce somewhat smaller quantities of fission products per unit of electricity generated—perhaps 10 to 30%—but this is a relatively small effect in the scheme of things.) And for reactors with denser fuels, the volume and mass of the spent fuel generated may be smaller, but the concentration of fission products in the spent fuel, and the heat generated by the decay products—factors that really matter to safety—will be proportionately greater.
Therefore, entities that hope to acquire SMRs, like data centers that lack the necessary waste infrastructure, will have to safely manage the storage of significant quantities of spent nuclear fuel on site for the long term, just like any other nuclear power plant does. Claims by vendors such as Westinghouse that they will take away the reactors after the fuel is no longer usable are simply not credible, as there are no realistic prospects for licensing centralized sites where the used reactors could be taken for the foreseeable future. Any community with an SMR will have to plan to be a de facto long-term nuclear waste disposal site.
Despite the claims of developers, it is very unlikely that any reasonably foreseeable SMR design would be able to safely operate without reliable access to electricity from the grid to power coolant pumps and other vital safety systems. Just like today’s nuclear plants, SMRs will be vulnerable to extreme weather events or other disasters that could cause a loss of offsite power and force them to shut down. In such situations a user such as a data center operator would have to provide backup power, likely from diesel generators, for both the data center AND the reactor. And since there is virtually no experience with operating SMRs worldwide, it is highly doubtful that the novel designs being pitched now would be highly reliable right out of the box and require little monitoring and maintenance.
It very likely will take decades of operating experience for any new reactor design to achieve the level of reliability characteristic of the operating light-water reactor fleet. Premature deployment based on unrealistic performance expectations could prove extremely costly for any company that wants to experiment with SMRs.
Some advocates misleadingly claim that SMRs are more efficient than large ones because they use less fuel. In terms of the amount of heat generated, the amount of uranium fuel that must undergo nuclear fission is the same whether a reactor is large or small. And although reactors that use coolants other than water typically operate at higher temperatures, which can increase the efficiency of conversion of heat to electricity, this is not a big enough effect to outweigh other factors that decrease efficiency of fuel use.
Some SMRs designs require a type of uranium fuel called “high-assay low enriched uranium (HALEU),” which contains higher concentrations of the isotope uranium-235 than conventional light-water reactor fuel. Although this reduces the total mass of fuel the reactor needs, that doesn’t mean it uses less uranium nor results in less waste from “front-end” mining and milling activities: In fact, the opposite is more likely to be true.
If the nuclear bros have such a great SMR story to tell, why do they have to exaggerate so much?
One reason for this is that HALEU production requires a relatively large amount of natural uranium to be fed into the enrichment process that increases the uranium-235 concentration. For example, the TerraPower Natrium reactor which would use HALEU enriched to around 19% uranium-235, will require 2.5 to 3 times as much natural uranium to produce a kilowatt-hour of electricity than a light-water reactor. Smaller reactors, such as the 15-megawatt Oklo Aurora, are even more inefficient. Improving the efficiency of these reactors can occur only with significant advances in fuel performance, which could take decades of development to achieve.
Reactors that use uranium inefficiently have disproportionate impacts on the environment from polluting uranium mining and processing activities. They also are less effective in mitigating carbon emissions, because uranium mining and milling are relatively carbon-intensive activities compared to other parts of the uranium fuel cycle.
SMRs may have a role to play in our energy future, but only if they are sufficiently safe and secure. For that to happen, it is essential to have a realistic understanding of their costs and risks. By painting an overly rosy picture of these technologies with often misleading information, the nuclear bros are distracting attention from the need to confront the many challenges that must be resolved to make SMRs a reality—and ultimately doing a disservice to their cause.