top of page
  • Matt Tucker

Nuclear Power: Necessary Technology for the Energy Transition?

Climate Action Guide's blog series "Yay! or Nay!" takes both sides of the argument. We aren't doing this to confuse our readers. Rather, we believe that to be well informed, advocates for the climate should understand both sides of the argument rather than blindly repeat something they have heard or something they have been told they should believe. Whichever side of these arguments you decide in the end is stronger, try to keep in mind that the "other side" had some good points too. This should give you some humility and empathy when inevitably you are confronted with people you disagree with.


Nay! ... Why Nuclear Power Is NOT necessary for the Energy Transition

In the face of the ever-worsening climate crisis, the search for clean energy solutions has become paramount. Nuclear power, often touted as a low-carbon alternative to fossil fuels, has re-entered the conversation. However, a closer look reveals that nuclear power presents significant drawbacks and ultimately hinders, rather than aids, the transition to a truly sustainable energy future.

  1. The Myth of Clean Energy: While nuclear power plants don't directly emit greenhouse gases during operation, their lifecycle is far from clean. Uranium mining and enrichment processes contribute significantly to environmental damage and pose health risks to workers and surrounding communities. Additionally, the issue of radioactive waste disposal remains unresolved. Yucca Mountain, the proposed US repository, faces ongoing technical and political challenges, leaving highly radioactive waste in limbo for generations to come.

  2. The High Cost of Nuclear: Building and maintaining nuclear power plants are notoriously expensive. Construction delays, safety regulations, and decommissioning costs all contribute to a hefty price tag. This financial burden not only strains budgets but also diverts resources away from potentially cheaper and more scalable renewable energy solutions.

  3. The False Promise of Baseload Power: Proponents of nuclear power often claim it's necessary to provide "baseload power," a constant and reliable source of electricity. However, this argument is increasingly outdated. Advances in grid management, energy storage, and demand-side response technologies are demonstrating the feasibility of integrating high levels of variable renewable energy sources like solar and wind into the grid without compromising stability. Mark Jacobson, a Stanford University professor and leading expert in renewable energy, has extensively studied the feasibility of transitioning to 100% renewable energy across various regions. His research demonstrates that such a transition is not only possible but also economically viable using existing technologies.

  4. The Shadow of Accidents: Despite advancements in safety measures, the potential for catastrophic accidents with lasting consequences looms large. The disasters at Chernobyl and Fukushima serve as stark reminders of the devastating human and environmental impact such events can have. The fear associated with these incidents can also hinder public acceptance and investment in nuclear power, or is in the case of Japan and Germany, an entire country's nuclear power industry can be quickly hobbled after an accident due to public opinion turning against it.

  5. The Case Studies: Germany and Japan: Two countries often cited as examples of successful nuclear power programs are actively moving away from it. Germany has pledged to phase out nuclear power entirely by 2022, focusing instead on renewables. Similarly, Japan, following the Fukushima disaster, has significantly reduced its reliance on nuclear power and is investing heavily in renewable energy sources.

  6. Nuclear and Renewables Don't Mix Well: A 2020 study by researchers at the University of Sussex in the U.K. concluded that nuclear and renewables mix like oil and water on the grid. The reason is that nuclear power plants want to be on all the time, so they don't complement wind and solar that ramp up and down throughout the day. The best complement to renewables is a technology that is on when they aren't, like long term storage technologies like compressed air, potential energy towers, and long duration batteries.

Focusing on nuclear power diverts attention and resources away from the real solutions:

  • Rapidly Scaling Up Renewable Energy Sources: Solar, wind, geothermal, and other renewables are becoming increasingly cost-competitive and efficient. Continued innovation and investment in these technologies are crucial for achieving a clean energy future.

  • Investing in Energy Storage Solutions: Technologies like batteries and pumped hydro storage are essential for managing the variability of renewable energy sources and ensuring grid stability.

  • Investing in the Transmission Network: Rapidly expanding the transmission line network in this country, will allow for renewables to play a larger role in our energy mix, without the need for baseload power.

  • Improving Energy Efficiency: Implementing measures to reduce overall energy consumption across sectors like transportation and buildings is critical for minimizing the demand on the grid.


While the urgency of addressing climate change is undeniable, nuclear power is not the answer. Its high costs, unresolved waste disposal issues, and inherent safety risks make it an unattractive and ultimately unhelpful option. By focusing on rapidly scaling up truly clean and sustainable solutions like renewable energy, energy storage, and efficiency, we can create a future powered by clean and reliable energy for generations to come.


Yay! ... Why Nuclear Power Is Necessary for the Energy Transition

As the world grapples with the urgency of climate change, the transition to clean energy sources is no longer a question of "if" but "how." While renewable energy like solar and wind are experiencing significant growth, they face inherent limitations due to their intermittent nature. This is where nuclear power emerges as a crucial and often misunderstood piece of the clean energy puzzle.

  • Addressing the 24/7 Demand: Unlike renewables, which vary depending on weather conditions, nuclear power plants operate continuously, providing a stable and reliable source of baseload power. This is vital for industrial applications that require uninterrupted energy supply. Companies like Microsoft are actively exploring nuclear power options to power their data centers, recognizing the need for consistent and reliable energy for their operations.

  • Rapid Deployment Potential: Contrary to the perception of slow deployment, nuclear power has a proven track record of rapid scaling. The United States built over 100 commercial reactors in just three decades following the launch of the civilian nuclear program in the 1950s. Similarly, China is currently experiencing a nuclear renaissance, with ambitious plans to expand its nuclear capacity significantly. This demonstrates the feasibility of rapid nuclear deployment with proper planning and investment.

  • Complementing Renewables, not Replacing Them: Nuclear power is not intended to replace renewables entirely but rather complement them by providing a reliable and dispatchable source of clean energy. This allows for deeper integration of renewables into the grid without compromising stability. Technologies like Molten Salt Reactors (MSRs) further enhance this synergy.

  • Perfect Replacement for Coal Fired Plants: A September, 2023 study by the U.S. Department of Energy (DOE) ‘Challenges of Converting Retiring Coal Plants into Nuclear Plants’ evaluated 157 retired coal sites and 237 operating coal power plant sites and found that 80% have the characteristics necessary to host an advanced nuclear reactor. This represents a capacity potential of 250 GWe. Citing new advanced nuclear plants on the site of old coal plants has a couple of advantages: the plant would have easy access to the grid and old coal plant workers could transition to working at the nuclear plant.

The Molten Salt Advantage:

  • Heat Storage: MSRs utilize molten salt as a heat transfer and storage medium. This allows the reactor to store excess thermal energy generated during periods of high renewable energy production and release it during peak demand periods when renewables are less available. This essentially extends the effective output of the reactor, providing a buffer for grid fluctuations.

  • Scalability: Molten salt reactors can be designed in modular units, enabling scalable deployment to meet specific energy needs. This allows for gradual integration into existing grids without overwhelming infrastructure capacity .

  • Waste Reduction: MSRs offer the potential for closed-fuel cycles, significantly reducing the amount of nuclear waste generated. This addresses a major concern surrounding traditional nuclear power plants.

Addressing Concerns:

While nuclear power offers significant benefits, concerns regarding safety and waste disposal remain. However, it's crucial to acknowledge the continuous advancements in safety technology and waste management strategies. Modern reactors incorporate multiple safety features to minimize the risk of accidents, and research into advanced waste reprocessing and recycling is ongoing.


The energy transition demands a multifaceted approach. Nuclear power, when deployed responsibly and alongside advancements like Molten Salt Reactors, presents a compelling solution. It offers reliable baseload power, complements renewable energy integration, and holds potential for waste reduction. By harnessing the combined strengths of nuclear and renewable energy, we can build a clean, sustainable, and secure energy future for generations to come.

4 views0 comments


bottom of page