Nuclear fusion breakthrough: Scientists generate more power than used to create reaction
On Tuesday, the head of the Department of Energy and other federal scientific leaders announced that a fusion reaction run at the Lawrence Livermore National Laboratory in California achieved net energy, meaning the reaction generated more energy than was put in to initiate the reaction. It is the first time humankind has achieved this landmark.
Fusion is the way that the sun makes power, but recreating a useful fusion reaction here on earth has eluded scientists for decades. Achieving net positive energy paves the way for fusion to move from a lab science to a usable energy source, although large scale commercialization of fusion could still be decades away.
Fusion is particularly attractive given the increasing urgency of climate change because if it can be commercialized at scale, it produces no carbon emissions, nor does it produce the long-lasting nuclear waste associated with nuclear fission, which is the type of nuclear energy used to make energy today.
The National Ignition Facility target chamber at the Lawrence Livermore National Laboratory is where scientists shoot lasers and watch and measure what happens when those lasers collide on a fuel source. Temperatures of 100 million degrees and pressures extreme enough to compress a target up to 100 times the density of lead are created in this facility.
Photo by Damien Jemison/ Lawrence Livermore National Laboratory
“Monday, December 5, 2022 was an important day in science,” Jill Hruby, the National Nuclear Security Administration Administrator, said at a press conference announcing the news on Tuesday in Washington D.C. “Reaching ignition in a controlled fusion experiment is an achievement that has come after more than 60 years of global research, development, engineering and experimentation.”
Reaching ignition means the fusion experiment produced more energy from fusion than the laser energy that used to drive the reaction. Since the experiment, the team has been analyzing data to be able to make this official announcement.
“This is important. Earlier results were records, but not yet producing more energy out than was put in,” Andrew Holland, the CEO of the industry’s trade group, the Fusion Industry Association, told CNBC. “For the first time on Earth, scientists have confirmed a fusion energy experiment released more power than it takes to initiate, proving the physical basis for fusion energy. This will lead fusion to be a safe and sustainable energy source in the near future.”
In the experiment on Dec. 5, about two megajoules (a unit of energy) went into the reaction and about three megajoules came out, said Marvin Adams, Deputy Administrator for Defense Programs at the National Nuclear Security Administration. “A gain of 1.5,” Adams said.
For the experiment, super high powered lasers are all directed at a very tiny fuel target at the National Ignition Facility at the Lawrence Livermore National Laboratory. “During experiments, 192 high energy lasers converge on a target about the size of a peppercorn heating a capsule of deuterium and tritium to over 3 million degrees Celsius and briefly simulating the conditions of a star,” Hruby said.
The main mission of the National Lab is studying nuclear power for use in national defense, and this nuclear fusion research is part of an effort established in 1996 by then President Clinton to maintain confidence in the safety of nuclear weapons stockpiles without full-scale nuclear testing.
But this discovery has massive implications for clean energy, too. In addition to the national security work, “we have taken the first tentative steps towards a clean energy source that could revolutionize the world,” Hruby said.
While this scientific breakthrough that is being celebrated at the highest levels of government, it will be many years before fusion power plants are likely to provide clean abundant energy.
“This is one igniting capsule, one time. And to realize commercial fusion energy, you have to do many things. You have to be able to produce many, many fusion ignition events per minute,” Kim Budil, the director of the Lawrence Livermore Lab, said on Tuesday.
“You have to have a robust system of drivers to enable that. So, you know, probably decades. Not six decades, I don’t think. Not five decades, which is what we used to say. I think it’s moving into the foreground and probably, with concerted effort and investment, a few decades of research on the underlying technologies could put us in a position to build a power plant.”
Omar A. Hurricane, Chief Scientist for the Inertial Confinement Fusion Program at Lawrence Livermore, explained, “What remains to be done from here is largely engineering, of increasing the laser energy efficiency and increasing the target energy gain with further target optimizations.”
Hurricane added, “This new result does indeed bring commercial fusion closer, as it demonstrates that there are no fundamental physics obstacles. It is starting to feel like we are entering the ‘Fusion Age.'”
One step forward in the ‘Fusion Age’
Interest in fusion has increased dramatically in recent years as concerns about climate change and energy security have become more acute.
More than 90 nuclear power reactors currently operate in the United States, but those nuclear reactors employ nuclear fission, which is when a neutron smashes into a larger atom, causing it to split into two smaller atoms and releasing a lot of energy. Nuclear fission reactions do not release any carbon dioxide emissions and therefore are considered clean energy, according to the U.S. Department of Energy.
The United States got approximately 19 percent of its utility-scale electricity generation from those nuclear power plants in 2021, according to the U.S. Energy Information Administration, and the energy from nuclear fission reactors represents half of the clean power generated in the United States, according to the Department of Energy.
However, those reactors generate long-lasting nuclear radioactive waste, and most countries, including the United States, currently have no long-term storage facilities for that waste. Efforts to build a permanent, underground geologic storage facility for nuclear waste have thus far been stymied in the United States.
Fusion happens when two atoms slam together to form a heavier atom, releasing huge amounts of energy without generating carbon dioxide emissions or long-lasting nuclear waste. But it’s proven extremely challenging to sustain a fusion reaction here on earth, and scientists have been trying for decades. In particular, it requires massive amounts of energy to generate fusion on reactions, and until this experiment, nobody had demonstrated the ability to get more energy out of the reaction than it takes to power it.
“Scientists have struggled to show that fusion can release more energy out than is put in since the 1950s,” plasma physicist Arthur Turrell told CNBC.
“During those decades, every time anyone has asked for funding for developing fusion power, the response has always been ‘first, you must show that it works in principle,'” said Turrell, who is also the author of The Star Builders. “That is, you must show that a fusion experiment can produce more energy than it uses. The researchers at Lawrence Livermore have done this for the first time ever.”
Fusion is already a hot space for climate and energy investors — so far, investors have poured almost $5 billion in investment into private fusion energy startups, according to the Fusion Industry Association, and more than half of that has been since since the second quarter of 2021.
“Everyone in the laser fusion (or inertial confinement fusion) community has been focused on getting to more energy out than in on a single experiment, because that is the key to showing the proof of principle and unlocking further investment and interest,” Turrell told CNBC.
Indeed, the private fusion industry is seeing this as a win.
“Now, the privately funded fusion industry will take the next steps, turning experimental results like this into a viable source of clean, safe energy,” Holland told CNBC. “In short, this will show the world that fusion is not science fiction: it will soon be a viable source of energy. Of course there are still many steps between these experimental results and fusion power plants, but this is an important milestone that brings us closer to the day when fusion will provide the world with clean, safe, and abundant energy.”
Tik Tok creators gather before a press conference to voice their opposition to the “Protecting Americans from Foreign Adversary Controlled Applications Act,” pending crackdown legislation on TikTok in the House of Representatives, on Capitol Hill in Washington, U.S., March 12, 2024.
Craig Hudson | Reuters
The Supreme Court on Friday will hear oral arguments in the case involving the future of TikTok in the U.S., which could ban the popular app as soon as next week.
The justices will consider whether the Protecting Americans from Foreign Adversary Controlled Applications Act, the law that targets TikTok’s ban and imposes harsh civil penalties for app “entities” that continue to carry the service after Jan.19, violates the U.S. Constitution’s free speech protections.
It’s unclear when the court will hand down a decision, and if China’s ByteDance continues to refuse to divest TikTok to an American company, it faces a complete ban nationwide.
What will change about the user experience?
The roughly 115 million U.S. TikTok monthly active users could face a range of scenarios depending on when the Supreme Court hands down a decision.
If no word comes before the law takes effect on Jan. 19 and the ban goes through, it’s possible that users would still be able to post or engage with the app if they already have it downloaded. However, those users would likely be unable to update or redownload the app after that date, multiple legal experts said.
Thousands of short-form video creators who generate income from TikTok through ad revenue, paid partnerships, merchandise and more will likely need to transition their businesses to other platforms, like YouTube or Instagram.
“Shutting down TikTok, even for a single day, would be a big deal, not just for people who create content on TikTok, but everyone who shares or views content,” said George Wang, a staff attorney at the Knight First Amendment Institute who helped write the institute’s amicus briefs on the case.
“It sets a really dangerous precedent for how we regulate speech online,” Wang said.
Who supports and opposes the ban?
Dozens of high-profile amicus briefs from organizations, members of Congress and President-elect Donald Trump were filed supporting both the government and ByteDance.
The government, led by Attorney General Merrick Garland, alleges that until ByteDance divests TikTok, the app remains a “powerful tool for espionage” and a “potent weapon for covert influence operations.”
Trump’s brief did not voice support for either side, but it did ask the court to oppose banning the platform and allow him to find a political resolution that allows the service to continue while addressing national security concerns.
The short-form video app played a notable role in both Trump and Democratic nominee Kamala Harris’ presidential campaigns in 2024, and it’s one of the most common news sources for younger voters.
In a September Truth Social post, Trump wrote in all caps Americans who want to save TikTok should vote for him. The post was quoted in his amicus brief.
What comes next?
It’s unclear when the Supreme Court will issue its ruling, but the case’s expedited hearing has some predicting that the court could issue a quick ruling.
The case will have “enormous implications” since TikTok’s user base in the U.S. is so large, said Erwin Chemerinsky, dean of Berkeley Law.
“It’s unprecedented for the government to prohibit platforms for speech, especially one so many people use,” Chemerinsky said. “Ultimately, this is a tension between free speech issues on the one hand and claims of national security on the other.”
WATCH: It appears TikTok could really get shut down, says Jim Cramer
Nvidia CEO Jensen Huang speaks about Project Digits personal AI supercomputer for researchers and students during a keynote address at the Consumer Electronics Show (CES) in Las Vegas, Nevada on January 6, 2025. Gadgets, robots and vehicles imbued with artificial intelligence will once again vie for attention at the Consumer Electronics Show, as vendors behind the scenes will seek ways to deal with tariffs threatened by US President-elect Donald Trump. The annual Consumer Electronics Show (CES) opens formally in Las Vegas on January 7, 2025, but preceding days are packed with product announcements. (Photo by Patrick T. Fallon / AFP) (Photo by PATRICK T. FALLON/AFP via Getty Images)
Patrick T. Fallon | Afp | Getty Images
Nvidia CEO Jensen Huang was greeted as a rock star this week CES in Las Vegas, following an artificial intelligence boom that’s made the chipmaker the second most-valuable company in the world.
At his nearly two-hour keynote on Monday kicking off the annual conference, Huang packed a 12,000-seat arena, drawing comparisons to the way Steve Jobs would reveal products at Apple events.
Huang concluded with an Apple-like trick: a surprise product reveal. He presented one of Nvidia’s server racks and, using some stage magic, held up a much smaller version, which looked like a tiny cube of a computer.
“This is an AI supercomputer,” Huang said, while donning an alligator skin leather jacket. “It runs the entire Nvidia AI stack. All of Nvidia’s software runs on this.”
Huang said the computer is called Project Digits and runs off a relative of the Grace Blackwell graphics processing units (GPUs) that are currently powering the most advanced AI server clusters. The GPU is paired with an ARM-based Grace central processing unit (CPU). Nvidia worked with Chinese semiconductor company MediaTek to create the system-on-a chip called GB10.
Formerly known as the Consumer Electronics Show, CES is typically the spot to launch flashy and futuristic consumer gadgets. At this year’s show, which started on Tuesday and wraps up on Friday, several companies announced AI integrations with appliances, laptops and even grills. Other major announcements included a laptop from Lenovo which has a rollable screen that can expand vertically. There were also new robots, including a Roomba competitor with a robotic arm.
Unlike Nvidia’s traditional GPUs for gaming, Project Digits isn’t targeting consumers. instead, it’s aimed at machine learning researchers, smaller companies, and universities that want to developed advanced AI but don’t have the billions of dollars to build massive data centers or buy enough cloud credits.
“There’s a gaping hole for data scientists and ML researchers and who are actively working, who are actively building something,” Huang said. “Maybe you don’t need a giant cluster. You’re just developing the early versions of the model, and you’re iterating constantly. You could do it in the cloud, but it just costs a lot more money.”
The supercomputer will cost about $3,000 when it becomes available in May, Nvidia said, and will be available from the company itself as well as some of its manufacturing partners. Huang said Project Digits is a placeholder name, indicating it may change by the time the computer goes on sale.
“If you have a good name for it, reach out to us,” Huang said.
Diversifying its business
It’s a dramatically different kind of product from the GPUs that have driven Nvidia’s historic boom in the past two years. OpenAI, which launched ChatGPT in late 2022, and other AI model creators like Anthropic have joined with large cloud providers in snapping up Nvidia’s data center GPUs because of their ability to power the most intensive models and computing workloads.
Data center sales accounted for 88% of Nvidia’s $35 billion in revenue in the most recent quarter.
Wall Street is focused on Nvidia’s ability to diversify its business so that it’s less reliant on a handful of customers buying massive AI systems.
The Nvidia Project Digits supercomputer during the 2025 CES event in Las Vegas, Nevada, US, on Wednesday, Jan. 8, 2025.
Bridget Bennett | Bloomberg | Getty Images
“It was a little scary to see Nvidia come out with something so good for so little in price,” Melius Research analyst Ben Reitzes wrote in a note this week. He said Nvidia may have “stolen the show,” due to Project Digits as well other announcements including graphics cards for gaming, new robot chips and a deal with Toyota.
Project Digits, which runs Linux and the same Nvidia software used on the company’s GPU server clusters, represents a huge increase in capabilities for researchers and universities, said David Bader, director of the Institute for Data Science at New Jersey Institute of Technology.
Bader, who has worked on research projects with Nvidia in the past, said the computer appears to be able to handle enough data and information to train the biggest and most cutting-edge models. He told CNBC Anthropic, Google, Amazon and others “would pay $100 million to build a super computer for training” to get a system with these sorts of capabilities.
For $3,000, users can soon get a product they can plug into a standard electrical outlet in their home or office, Bader said. It’s particularly exciting for academics, who have often left for private industry in order to access bigger and more powerful computers, he said.
“Any student who is able to have one of these systems that cost roughly the same as a high-end laptop or gaming laptop, they’ll be able to do the same research and build the same models,” Bader said.
Reitzes said the computer may be Nvidia’s first move into the $50 billion market for PC and laptop chips.
“It’s not too hard to imagine it would be easy to just do it all themselves and allow the system to run Windows someday,” Reitzes wrote. “But I guess they don’t want to step on too many toes.”
Huang didn’t rule out that possibility when asked about it by Wall Street analysts on Tuesday.
He said that MediaTek may be able to sell the GB10 chip to other computer makers in the market. He made sure to leave some mystery in the air.
“Obviously, we have plans,” Huang said.
Alice Weidel, co-leader of the far-right Alternative for Germany (AfD) political party, arrives to speak to the media with AfD co-leader Tino Chrupalla shortly after the AfD leadership confirmed Weidel as the party’s candidate for chancellor on December 07, 2024 in Berlin, Germany.
Maryam Majd | Getty Images
Elon Musk used his social network X to promote Germany’s far-right Alternative for Germany party, known as AfD, hosting a live discussion Thursday with party leader Alice Weidel, a candidate for chancellor, ahead of a general election on Feb. 23.
“I’m really strongly recommending that people vote for AfD,” Musk, who is CEO of Tesla and SpaceX in addition to his role at X, said about a half hour into the conversation. “That’s my strong recommendation.”
The AfD has been classified as a “suspected extremist organization” by German domestic intelligence services. The party’s platform calls for rigid asylum laws, mass deportations, cuts to social and welfare support in Germany, and the reversal of restrictions on combustion engine vehicles.
Thierry Breton, former European Union commissioner for the internal market, said in a Jan. 4 post on X directed at Weidel: “As a European citizen concerned with the proper use of systemic platforms authorized to operate in the EU … especially to protect our democratic rules against illegal or misbehavior during election times, I believe it’s crucial to remind you” that a live discussion on X would give AfD and Weidel “a significant and valuable advantage over your competitors.”
While AfD has amassed about 20% of public support, according to reporting from broadcaster DW, the party is unlikely to form part of a coalition government, as most other parties have vowed not to work with it.
AfD previously protested the build-out of Tesla’s electric vehicle factory outside Berlin, in part because the factory would provide jobs to people who were not German citizens.
Musk’s earlier endorsements of AfD, including tweets complimenting the party and an editorial in a German newspaper, have enraged European government officials. Musk, the wealthiest person in the world, has also endorsed far-right and anti-establishment candidates and causes in the U.K.
Political leaders in France, Germany, Norway and the U.K. denounced his influence, NBC News previously reported, warning that Musk should not involve himself in their countries’ elections.
Musk, who was one of President-elect Donald Trump’s top backers in November’s election, previously promoted Trump in a live-streamed discussion on X. Before that, he hosted a conversation with Florida Gov. Ron DeSantis, who lost to Trump in the Republican primary.
Weidel during Thursday’s talk asked Musk about what Trump might do to bring Russia’s war in Ukraine to a conclusion, as the president-elect has suggested he could quickly do.
Musk demurred.
“To be clear this is up to President Trump, he is commander and chief, so it’s really up to him,” Musk said. “I don’t want to speak for him but you know I do think that there is a path to a resolution but it does require strong leadership in the United States to get this done.”
Musk also weighed in on what he thought should be done in Gaza, which has been under attack from Israel since Hamas’ deadly incursion into Israel on Oct. 7, 2023.
“There’s no choice but to eliminate those who wish to eliminate the state of Israel, you know Hamas essentially,” Musk said. “Then, the second step is to fix the education so that Palestinians are not trained from when they are children to hate and want the death of Israel.”
“Then, the third thing, which is also very important, is to make the Palestinian areas prosperous.”
— CNBC’s Sophie Kiderlin contributed to this report.
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