Three Big Questions About Next-Generation Nuclear Energy, Answered One by One

Editor's Note: Nuclear Renaissance and the AI Era's Power Revolution

At a critical juncture in the global energy transition, nuclear energy is once again in the spotlight. An online roundtable recently hosted by MIT Technology Review, focusing on next-generation nuclear energy, hyperscale AI data centers, and the power grid, attracted a large audience with numerous questions. These questions spanned technology, safety, economics, and other dimensions, reflecting the public's urgent expectations for clean energy. With the explosive growth of AI technology, data center electricity demand has surged, making it difficult for traditional energy sources to meet the need. Next-generation nuclear energy stands out due to its high density and low-carbon emissions. Based on the discussion, this article selects three major questions to answer one by one, supplementing industry background and analytical insights to help readers understand the future energy landscape.

Question 1: What is next-generation nuclear energy? How is it different from traditional nuclear power?

Next-generation nuclear energy generally refers to advanced nuclear reactor technologies, mainly including Small Modular Reactors (SMRs), Generation IV reactors, and high-temperature gas-cooled reactors. These technologies aim to address the pain points of traditional large nuclear power plants, such as safety risks, high costs, and long construction periods.

Traditional nuclear power relies on large pressurized water reactors, with a single-unit power exceeding 1,000 MW and a construction cycle of more than 10 years, while SMRs have a power of only tens to hundreds of megawatts, can be factory prefabricated and modularly assembled, shortening the cycle to 3-5 years.

According to the International Atomic Energy Agency (IAEA), more than 80 SMR designs are under development globally. The VOYGR reactor from NuScale Power in the United States has received approval from the U.S. Nuclear Regulatory Commission (NRC), becoming the first commercial SMR. Background context: Nuclear accidents in the 1970s, such as Three Mile Island and Chernobyl, severely damaged the reputation of nuclear energy, but new-generation designs incorporate passive safety systems (e.g., natural circulation cooling), reducing accident probability to below 1 in 10,000. China Huaneng's Linglong One SMR and Russia's floating nuclear power plant have been commissioned, demonstrating feasibility.

Editor's analysis: Next-generation nuclear energy is not just a technological upgrade but a strategic choice for energy security. Amid frequent geopolitical conflicts, it reduces dependence on fossil fuel imports and advances carbon neutrality goals.

Question 2: How can next-generation nuclear energy empower hyperscale AI data centers?

The "power hunger" of AI data centers has become an industry consensus. Data centers of giants like OpenAI and Google already demand power at the gigawatt level, and it is projected that by 2030, global AI electricity consumption will account for more than 10% of total electricity. Traditional wind and solar power are highly intermittent and cannot match 24/7 operation needs, while nuclear energy provides stable baseload power.

In the roundtable discussion, multiple experts pointed out that SMRs are an ideal solution: compact size, deployable near data centers to avoid long-distance transmission losses. For example, Microsoft has partnered with Constellation Energy to restart the Three Mile Island nuclear plant to power its AI cloud services; Amazon has invested in X-energy's Xe-100 SMR, targeting a 2028 launch. Additional context: A single hyperscale data center can have a power demand of 500 MW, equivalent to the electricity consumption of a medium-sized city, and a single SMR can cover that.

Casey Crownhart emphasized in the original article: "The combination of nuclear energy and AI data centers will reshape the grid architecture."

China is also making moves. Alibaba Cloud and China National Nuclear Corporation (CNNC) are exploring SMR cooperation to support the East-West Computing Transfer project. Editor's view: This is not just about power supply but an ecological win-win — advances in nuclear waste treatment technology (such as deep geological disposal) will alleviate environmental concerns, and AI algorithms can optimize nuclear plant operations, further improving efficiency.

Question 3: What impact will next-generation nuclear energy have on the grid? Do opportunities outweigh challenges?

The grid faces dual pressures: surging AI loads and renewable energy fluctuations. As a dispatchable power source, next-generation nuclear energy can smooth peak and valley loads and achieve grid stability. The International Energy Agency (IEA) predicts that nuclear energy needs to double or triple by 2050 to support net-zero emissions.

The opportunities are clear: modular design facilitates distributed deployment, enhancing grid resilience; fuel utilization rises from 5% to over 95%, reducing uranium mining pressure. The U.S. Inflation Reduction Act provides a 40% subsidy for advanced nuclear power, and the EU classifies nuclear as green energy. Under China's "dual carbon" goals, nuclear installed capacity is planned to increase from 58 GW to 150 GW.

Challenges also exist: high initial investment (SMR unit cost about $500 million), public acceptance, and supply chain bottlenecks. But roundtable feedback shows that the younger generation favors nuclear energy, with Gallup polls showing 55% support.

Audience question: "How is nuclear waste handled?" Answer: 95% is low-level waste that can be reused; high-level waste is stored in a deep geological repository like Finland's Onkalo, with a safety period of over 100,000 years.

Editor's analysis: Opportunities outweigh challenges. The combination of policy dividends, technological maturity, and AI demand will drive a "nuclear explosion"-style renaissance. In the future, a hybrid model of nuclear + storage + renewables may become mainstream.

Conclusion: Nuclear Energy, the Clean Engine of the AI Era

The MIT Technology Review roundtable reveals that next-generation nuclear energy is not just an energy solution but also a frontier of technological innovation. Facing the climate crisis and digital wave, it offers a reliable path. Only by staying informed can one seize the opportunity.

This article is compiled from MIT Technology Review, by Casey Crownhart, 2026-02-05.