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U.S. fusion breakthrough could change world's energy future

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.”

How nuclear power is changing

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Former Microsoft CEO Steve Ballmer says, as shareholder, tariffs are ‘not good’

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Former Microsoft CEO Steve Ballmer says, as shareholder, tariffs are 'not good'

President Trump’s new tariffs on goods that the U.S. imports from over 100 countries will have an effect on consumers, former Microsoft CEO Steve Ballmer told CNBC on Friday. Investors will feel the pain, too.

Microsoft’s stock dropped almost 6% in the past two days, as the Nasdaq wrapped up its worst week in five years.

“As a Microsoft shareholder, this kind of thing is not good,” Ballmer said, in an interview with Andrew Ross Sorkin that was tied to Microsoft’s 50th anniversary celebration. “It creates opportunity to be a serious, long-term player.”

Ballmer was sandwiched in between Microsoft co-founder Bill Gates and current CEO Satya Nadella for the interview.

“I took just enough economics in college — that tariffs are actually going to bring some turmoil,” said Ballmer, who was succeeded by Nadella in 2014. Gates, Microsoft’s first CEO, convinced Ballmer to join the company in 1980.

Gates, Ballmer and Nadella attended proceedings at Microsoft’s Redmond, Washington, campus on Friday to celebrate its first half-century.

Between the tariffs and weak quarterly revenue guidance announced in January, Microsoft’s stock is on track for its fifth straight month of declines, which would be the worst stretch since 2009. But the company remains a leader in the PC operating system and productivity software markets, and its partnership with startup OpenAI has led to gains in cloud computing.

“I think that disruption is very hard on people, and so the decision to do something for which disruption was inevitable, that needs a lot of popular support, and nobody could game theorize exactly who is going to do what in response,” Ballmer said, regarding the tariffs. “So, I think citizens really like stability a lot. And I hope people — individuals who will feel this, because people are feeling it, not just the stock market, people are going to feel it.”

Ballmer, who owns the Los Angeles Clippers, is among Microsoft’s biggest fans. He said he’s the company’s largest investor. In 2014, shortly after he bought the basketball team for $2 billion, he held over 333 million shares of the stock, according to a regulatory filing.

“I’m not going to probably have 50 more years on the planet,” he said. “But whatever minutes I have, I’m gonna be a large Microsoft shareholder.” He said there’s a bright future for computing, storage and intelligence. Microsoft launched the first Azure services while Ballmer was CEO.

Earlier this week Bloomberg reported that Microsoft, which pledged to spend $80 billion on AI-enabled data center infrastructure in the current fiscal year, has stopped discussions or pushed back the opening of facilities in the U.S. and abroad.

JPMorgan Chase’s chief economist, Bruce Kasman, said in a Thursday note that the chance of a global recession will be 60% if Trump’s tariffs kick in as described. His previous estimate was 40%.

“Fifty years from now, or 25 years from now, what is the one thing you can be guaranteed of, is the world needs more compute,” Nadella said. “So I want to keep those two thoughts and then take one step at a time, and then whatever are the geopolitical or economic shifts, we’ll adjust to it.”

Gates, who along with co-founder Paul Allen, sought to build a software company rather than sell both software and hardware, said he wasn’t sure what the economic effects of the tariffs will be. Today, most of Microsoft’s revenue comes from software. It also sells Surface PCs and Xbox consoles.

“So far, it’s just on goods, but you know, will it eventually be on services? Who knows?” said Gates, who reportedly donated around $50 million to a nonprofit that supported Democratic nominee Kamala Harris’ losing campaign.

— CNBC’s Alex Harring contributed to this report.

WATCH: There will be many LLM winners, says infrastructure investor Morrison

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AppLovin can offer TikTok ‘much stronger bid than others,’ CEO says

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AppLovin can offer TikTok 'much stronger bid than others,' CEO says

Piotr Swat | Lightrocket | Getty Images

AppLovin CEO Adam Foroughi provided more clarity on the ad-tech company’s late-stage effort to acquire TikTok, calling his offer a “much stronger bid than others” on CNBC’s The Exchange Friday afternoon.

Foroughi said the company is proposing a merger between AppLovin and the entire global business of TikTok, characterizing the deal as a “partnership” where the Chinese could participate in the upside while AppLovin would run the app.

“If you pair our algorithm with the TikTok audience, the expansion on that platform for dollars spent will be through the roof,” Foroughi said.

The news comes as President Trump announced he would extend the deadline a second time for TikTok’s Chinese-owned parent company ByteDance to sell the U.S. subsidiary of TikTok to an American buyer or face an effective ban on U.S. app stores. The new deadline is now in June, which, as Foroughi described, “buys more time to put the pieces together” on AppLovin’s bid. 

“The president’s a great dealmaker — we’re proposing, essentially an enhancement to the deal that they’ve been working on, but a bigger version of all the deals contemplated,” he added.

AppLovin faces a crowded field of other interested U.S. backers, including Amazon, Oracle, billionaire Frank McCourt and his Project Liberty consortium, and numerous private equity firms. Some proposals reportedly structure the deal to give a U.S. buyer 50% ownership of the company, rather than a complete acquisition. The Chinese government will still need to approve the deal, and AppLovin’s interest in purchasing TikTok in “all markets outside of China” is “preliminary,” according to an April 3 SEC filing.

Correction: A prior version of this story incorrectly characterized China’s ongoing role in TikTok should AppLovin acquire the app.

WATCH: AppLovin CEO Adam Foroughi on its bid to buy TikTok

AppLovin CEO Adam Foroughi on its bid to buy TikTok

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Trump’s tariff rates for other countries radically larger than World Trade data

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Trump's tariff rates for other countries radically larger than World Trade data

U.S. President Donald Trump speaks during an event announcing new tariffs in the Rose Garden at the White House in Washington, April 2, 2025.

Chip Somodevilla | Getty Images

President Donald Trump announced an aggressive, far-reaching “reciprocal tariff” policy this week, leaving many economists and U.S. trade partners to question how the White House calculated its rates.

Trump’s plan established a 10% baseline tariff on almost every country, though many nations such as China, Vietnam and Taiwan are subject to much steeper rates. At a ceremony in the Rose Garden on Wednesday, Trump held up a poster board that outlined the tariffs that it claims are “charged” to the U.S., as well as the “discounted” reciprocal tariffs that America would implement in response.

Those reciprocal tariffs are mostly about half of what the Trump administration said each country has charged the U.S. The poster suggests China charges a tariff of 67%, for instance, and that the U.S. will implement a 34% reciprocal tariff in response.

However, a report from the Cato Institute suggests the trade-weighted average tariff rates in most countries are much different than the figures touted by the Trump administration. The report is based on trade-weighted average duty rates from the World Trade Organization in 2023, the most recent year available.

The Cato Institute says the 2023 trade-weighted average tariff rate from China was 3%. Similarly, the administration says the EU charges the U.S. a tariff of 39%, while the 2023 trade-weighted average tariff rate was 2.7%, according to the report.

In India, the Trump administration claims that a 52% tariff is charged against the U.S., but Cato found that the 2023 trade-weighted average tariff rate was 12%.

Many users on social media this week were quick to notice that the U.S. appeared to have divided the trade deficit by imports from a given country to arrive at tariff rates for individual countries. It’s an unusual approach, as it suggests that the U.S. factored in the trade deficit in goods but ignored trade in services.

The Office of the U.S. Trade Representative briefly explained its approach in a release, and stated that computing the combined effects of tariff, regulatory, tax and other policies in various countries “can be proxied by computing the tariff level consistent with driving bilateral trade deficits to zero.”

If trade deficits are persistent because of tariff and non-tariff policies and fundamentals, then the tariff rate consistent with offsetting these policies and fundamentals is reciprocal and fair,” the USTR said in the release.

There is at least a 60% chance of recession if Trump's tariffs stick, says JPMorgan's David Kelly

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