Tesla and SpaceX CEO Elon Musk has sparked debate with his recent critique of global efforts to develop nuclear fusion technology. In a post on X, Musk dismissed the pursuit of “artificial suns” as an inefficient use of resources, even as governments and private companies worldwide invest billions in the potentially game-changing energy source. The comments come as the International Atomic Energy Agency (IAEA) reports accelerating progress in the field, with over 160 facilities now operating or planned globally.
Jakarta, CNN Indonesia —
Tesla and SpaceX founder Elon Musk has sharply criticized the global race to build nuclear fusion reactors, often referred to as “artificial suns.”
In a recent post on X, Musk described the Sun as a massive, free fusion reactor in the sky. He characterized efforts to create smaller versions on Earth as foolish and a waste of money.
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“The Sun is a massive fusion reactor that is free in the sky. Trying to make a small one on Earth is incredibly dumb and a waste of money,” Musk wrote in his post on Monday, December 15.
Musk argued that even burning four Jupiter-sized planets would contribute almost negligible energy compared to the total energy output of the Sun over the solar system’s lifetime.
“Even if you burned 4 Jupiters, the Sun would still produce almost 100 percent of all the energy that will ever be produced in the Solar System!” he stated.
Musk, currently the world’s wealthiest individual with a net worth exceeding $8.4 trillion, maintained that developing small-scale fusion reactors is only justifiable if honestly acknowledged as experimental science projects, not practical energy solutions.
“Stop wasting money on useless little fusion reactors, unless you are actively admitting they are science passion projects,” he added.
The comments come amid intensifying global competition in fusion energy development, a technology long touted as a future source of clean electricity but which continues to face technical hurdles and escalating costs. Fusion promises a potentially limitless, clean energy source, but achieving sustained fusion remains a significant scientific challenge.
The global fusion energy landscape is accelerating. A recent publication by the International Atomic Energy Agency (IAEA), the World Fusion Outlook 2025, notes that fusion research has shifted from purely scientific experimentation to a strategic national priority in many countries.
Currently, more than 160 fusion facilities are in operation, under construction, or planned worldwide. Global private investment in the sector has surpassed $10 billion, driven by sovereign wealth funds, major corporations, and energy consumers.
The IAEA’s “World Fusion Outlook 2025” highlights key global developments in fusion energy. ITER, the world’s largest fusion experiment, remains a major international effort driving scientific and technical progress.
Thirty-three countries and thousands of engineers and scientists are collaborating to build and operate a magnetic confinement fusion device called a Tokamak, designed to prove the feasibility of fusion as a large-scale, carbon-free energy source.
Meanwhile, governments, private industry, and utility companies are launching initiatives that complement this effort and expand the global fusion landscape. New facilities are being built, public-private partnerships are growing, and regulators are developing specific frameworks to keep pace with these developments.
Furthermore, end-users are demonstrating increasing confidence in the technology by signing preliminary electricity purchase agreements.
According to the IAEA, on its official website, this artificial sun fusion energy is expected to play a significant role in meeting the world’s growing demand for clean and reliable electricity.
For the first time, the IAEA’s World Fusion Outlook Report includes a global deployment model of fusion energy developed by the Massachusetts Institute of Technology (MIT). The study explores how fusion could contribute to the future electricity mix under various policy, cost, and technology scenarios.
The IAEA also revealed that fusion technology is currently evolving through various parallel efforts. Built on the foundation established by large-scale international collaborations such as ITER, various approaches are being developed in the public and private sectors, including Tokamaks, stellarators, laser and inertial confinement concepts, magneto-inertial concepts, mirror machines, reversed-field configurations, and pinches.
This diversity fosters innovation and strengthens the sector in its pursuit of realizing fusion energy.
The IAEA report also includes a global fusion deployment model developed by the Massachusetts Institute of Technology, which projects that fusion could potentially contribute up to 50 percent of global electricity by 2100 in the lowest-cost scenario.
(wpj/dmi)
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