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The White House is coordinating a five-year research plan to study ways of modifying the amount of sunlight that reaches the earth to temper the effects of global warming, a process sometimes called solar geoengineering or sunlight reflection.

The research plan will assess climate interventions, including spraying aerosols into the stratosphere to reflect sunlight back into space, and should include goals for research, what’s necessary to analyze the atmosphere, and what impact these kinds of climate interventions may have on Earth, according to the White House‘s Office of Science and Technology Policy. Congress directed the research plan be produced in its spending plan for 2022, which President Joe Biden signed in March.

Some of the techniques, such as spraying sulfur dioxide into the atmosphere, are known to have harmful effects on the environment and human health. But scientists and climate leaders who are concerned that humanity will overshoot its emissions targets say research is important to figure out how best to balance these risks against a possibly catastrophic rise in the Earth’s temperature.

Getting ready to research a topic is a very preliminary step, but it’s notable the White House is formally engaging with what has largely been seen as the stuff of dystopian fantasy. In Kim Stanley Robinson’s science fiction novel, “The Ministry for the Future,” a heat wave in India kills 20 million people and out of desperation, India decides to implement its own strategy of limiting the sunlight that gets to Earth.

Chris Sacca, the founder of climate tech investment fund Lowercarbon Capital, said it’s prudent for the White House to be spearheading the research effort.

“Sunlight reflection has the potential to safeguard the livelihoods of billions of people, and it’s a sign of the White House’s leadership that they’re advancing the research so that any future decisions can be rooted in science not geopolitical brinkmanship,” Sacca told CNBC. (Sacca has donated money to support research in the area, but said he has “zero financial interests beyond philanthropy” in the idea and does not think there should be private business models in the space, he told CNBC.)

Harvard professor David Keith, who first worked on the topic in 1989, said it’s being taken much more seriously now. He points to formal statements of support for researching sunlight reflection from the Environmental Defense Fund, the Union of Concerned Scientists, and the Natural Resources Defense Council, and the creation of a new group he advises called the Climate Overshoot Commission, an international group of scientists and lawmakers that’s evaluating climate interventions in preparation for a world that warms beyond what the Paris Climate Accord recommended.

To be clear, nobody is saying sunlight-reflection modification is the solution to climate change. Reducing emissions remains the priority.

“You cannot judge what the country does on solar-radiation modification without looking at what it is doing in emission reductions, because the priority is emission reductions,” said Janos Pasztor, executive director of the Carnegie Climate Governance Initiative. “Solar-radiation modification will never be a solution to the climate crisis.”

Three ways to reduce sunlight

The idea of sunlight reflection first appeared prominently in a 1965 report to President Lyndon B. Johnson, entitled “Restoring the Quality of Our Environment,” Keith told CNBC. The report floated the idea of spreading particles over the ocean at a cost of $100 per square mile. A one percent change in the reflectivity of the Earth would cost $500 million per year, which does “not seem excessive,” the report said, “considering the extraordinary economic and human importance of climate.”

The estimated price tag has gone up since then. The current estimate is that it would cost $10 billion per year to run a program that cools the Earth by 1 degree Celsius, said Edward A. Parson, a professor of environmental law at UCLA’s law school. But that figure is seen to be remarkably cheap compared to other climate change mitigation initiatives.

A landmark report released in March 2021 from the National Academies of Sciences, Engineering, and Medicine addressed three kinds of solar geoengineering: stratospheric aerosol injection, marine cloud brightening, and cirrus cloud thinning.

Stratospheric aerosol injection would involve flying aircraft into the stratosphere, or between 10 miles and 30 miles skyward, and spraying a fine mist that would hang in the air, reflecting some of the sun’s radiation back into space.

“The stratosphere is calm, and things stay up there for a long time,” Parson told CNBC. “The atmospheric life of stuff that’s injected in the stratosphere is between six months and two years.”

Stratospheric aerosol injection “would immediately take the high end off hot extremes,” Parson said. And also it would “pretty much immediately” slow extreme precipitation events, he said.

“The top-line slogan about stratospheric aerosol injection, which I wrote in a paper more than 10 years ago — but it’s still apt — is fast, cheap and imperfect. Fast is crucial. Nothing else that we do for climate change is fast. Cheap, it’s so cheap,” Parson told CNBC.

“And it’s not imperfect because we haven’t got it right yet. It’s imperfect because the imperfection is embedded in the way it works. The same reason it’s fast is the reason that it’s imperfect, and there’s no way to get around that.”

One option for an aerosol is sulfur dioxide, the cooling effects of which are well known from volcanic eruptions. The 1991 eruption of Mount Pinatubo, for instance, spewed thousands of tons of sulfur dioxide into the stratosphere, causing global temperatures to drop temporarily by about 1 degree Fahrenheit, according to the U.S. Geological Survey.

A giant volcanic mushroom cloud explodes some 20 kilometers high from Mount Pinatubo above almost deserted US Clark Air Base, on June 12, 1991 followed by another more powerful explosion. The eruption of Mount Pinatubo on June 15, 1991 was the second largest volcanic eruption of the twentieth century.

Arlan Naeg | Afp | Getty Images

There’s also a precedent in factories that burn fossil fuels, especially coal. Coal has some sulfur that oxidizes when burned, creating sulfur dioxide. That sulfur dioxide goes through other chemical reactions and eventually falls to the earth as sulfuric acid in rain. But during the time that the sulfur pollution sits in the air, it does serve as a kind of insulation from the heat of the sun.

Ironically, as the world reduces coal burning to curb the carbon dioxide emissions that cause global warming, we’ll also be eliminating the sulfur dioxide emissions that mask some of that warming.

“Sulfur pollution that’s coming out of smokestacks right now is masking between a third and a half of the heating signal from the greenhouse gases humans have already emitted into the atmosphere,” Parson said.

In other words, we’ve been doing one form of sunlight reflection for decades already, but in an uncontrolled fashion, explained Kelly Wanser, the executive director of SilverLining, an organization promoting research and governance of climate interventions.

“This isn’t something totally new and Frankenstein — we’re already doing it; we’re doing it in the most dirty, unplanned way you could possibly do it, and we don’t understand what we’re doing,” Wanser told CNBC. 

Spraying sulfur in the stratosphere is not the only way of manipulating the amount of sunlight that gets to the Earth, and some say it’s not the best option.

“Sulfur dioxide is likely not the best aerosol and is by no means the only technique for this. Cloud brightening is a very promising technique as well, for example,” Sacca told CNBC.

Marine cloud brightening involves increasing the reflectivity of clouds that are relatively close to the surface of the ocean with techniques like spraying sea salt crystals into the air. Marine cloud brightening generally gets less attention than stratospheric aerosol injection because it affects a half dozen to a few dozen miles and would potentially only last hours to days, Parson told CNBC.

Cirrus cloud thinning, the third category addressed in the 2021 report from the National Academies, involves thinning mid-level clouds, between 3.7 and 8.1 miles high, to allow heat to escape from the Earth’s surface. It is not technically part of the “solar geoengineering” umbrella category because it does not involve reflecting sunlight, but instead involves increasing the release of thermal radiation.

Known risks to people and the environment

There are significant and well-known risks to some of these techniques — sulfur dioxide aerosol injection, in particular.

First, spraying sulfur into the atmosphere will “mess with the ozone chemistry in a way that might delay the recovery of the ozone layer,” Parson told CNBC.

The Montreal Protocol adopted in 1987 regulates and phases out the use of ozone depleting substances, such as hydrochlorofluorocarbons (HCFCs) which were commonly used in refrigeration and air conditioners, but that healing process is still going on.

Also, sulfates injected into the atmosphere eventually come down as acid rain, which affects soil, water reservoirs, and local ecosystems.

Third, the sulfur in the atmosphere forms very fine particulates that can cause respiratory illness.

The question, then, is whether these known effects are more or less harmful than the warming they would offset.

“Yes, damaging the ozone is bad, acid deposition is bad, respiratory illness is bad, absolutely. And spraying sulfur in the stratosphere would contribute in the bad direction to all of those effects,” Parson told CNBC. “But you also have to ask, how much and relative to what?”

The sulfur already being emitted from the burning of fossil fuels is causing environmental damage and is already killing between 10 million to 20 million people a year due to respiratory illness, said Parson. “So that’s the way we live already,” he said.

Meanwhile, “the world is getting hotter, and there will be catastrophic impacts for many people in the world,” said Pasztor.

“There’s already too much carbon out there. And even if you stop all emissions today, the global temperature will still be high and will remain high for hundreds of years. So, that’s why scientists are saying maybe we need something else, in addition — not instead of — but maybe in addition to everything else that is being done,” he said. “The current action/nonaction of countries collectively — we are committing millions of people to death. That’s what we’re doing.”

For sunlight-reflection technology to become a tool in the climate change mitigation toolbox, awareness among the public and lawmakers has to grow slowly and steadily, according to Tyler Felgenhauer, a researcher at Duke University who studies public policy and risk.

“If it is to rise on to the agenda, it’ll be kind of an evolutionary development where more and more environmental groups are willing to state publicly that they’re for research,” Felgenhauer told CNBC. “We’re arguing it’s not going to be some sort of one big, bad climate event that makes us all suddenly adopt or be open to solar geoengineering — there will be more of a gradual process.”

A man waits for customers displaying fans at his store amid rising temperatures in New Delhi on May 27, 2020. – India is wilting under a heatwave, with the temperature in places reaching 50 degrees Celsius (122 degrees Fahrenheit) and the capital enduring its hottest May day in nearly two decades.

Jewel Samad | Afp | Getty Images

Research it now or be caught off guard later?

Some environmentalists consider sunlight relfection a “moral hazard,” because it offers a relatively easy and inexpensive alternative to doing the work of reducing emissions.

One experiment to study stratospheric aerosols by the Keutsch Group at Harvard was called off in 2021 due to opposition. The experiment would “threaten the reputation and credibility of the climate leadership Sweden wants and must pursue as the only way to deal effectively with the climate crisis: powerful measures for a rapid and just transition to zero emission societies, 100% renewable energy and shutdown of the fossil fuel industry,” an open letter from opponents said.

But proponents insist that researching sunlight-modification technologies should not preclude emissions-reduction work.

“Even the people like me who think it’s very important to do research on these things and to develop the capabilities all agree that the urgent top priority for managing climate change is cutting emissions,” Parson told CNBC.

Keith of Harvard agreed, saying that “we learn more and develop better mechanism[s] for governance.”

Doing research is also important because many onlookers expect that some country, facing an unprecedented climate disaster, will act unilaterally to will try some version of sunlight modification anyway — even if it hasn’t been carefully studied.

“In my opinion, it’s more than 90 percent likely that within the next 20 years, some major nation wants to do this,” Parson said.

Sacca put the odds even higher.

“The odds are 100 percent that some country pursues sunlight reflection, particularly in the wake of seeing millions of their citizens die from extreme weather,” Sacca told CNBC. “The world will not stand idly by and leaders will feel compelled to take action. Our only hope is that by doing the research now, and in public, the world can collaboratively understand the upsides and best methods for any future project.”  

Correction: The Climate Overshoot Commission has not issued a formal statement of support for sunlight reflection.

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Mark Zuckerberg unveils $799 Meta Ray-Ban Display glasses

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Mark Zuckerberg unveils 9 Meta Ray-Ban Display glasses

At the Meta Connect developer conference, Mark Zuckerberg, head of the Facebook group Meta, shows the prototype of computer glasses that can display digital objects in transparent lenses.

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Mark Zuckerberg on Wednesday unveiled the $799 Meta Ray-Ban Display glasses, the social media company’s first consumer-ready smart glasses with a built-in display.

The glasses, which costs $799, contain a small digital display that can be controlled via hand gestures through a wristband powered by neural technology, confirming a CNBC report in August. A promotional video of the new smart glasses appeared on Meta’s YouTube page on Monday but was later removed.

Tune in Thursday at 11:00 a.m. ET: Meta Chief Product Officer Chris Cox joins CNBC TV to discuss with Julia Boorstin the highlights of Meta’s annual Connect event, live from the company’s HQ in Menlo Park CA.

The new smart glasses are a bridge between the company’s audio-only Ray-Ban Meta smart glasses and the experimental Orion augmented reality glasses that the company revealed at last year’s Connect event. Orion can overlay 3D visuals over a person’s real-world field of view with the help of a wireless computing puck, but the glasses are expensive to make and not yet available to consumers.

The Meta Ray-Ban Display glasses come with the Meta Neural Band, an EMG wristband that allows users to control the device using hand gestures.

“These are glasses with the classic style that you’d expect from Ray-Ban, but they’re the first AI glasses with a high resolution display and a fully weighted Meta neural band,” Zuckerberg said.

With the new glasses, people can do tasks like watch videos through the display or see and respond to text messages, Zuckerberg said. The display doesn’t block a person’s view, and it disappears when not being used, he said.

The glasses go on sale in the U.S. on Sept. 30.

During a demo, Zuckerberg repeatedly attempted to call Meta tech chief Andrew Bosworth unsuccessfully.

“This is uh — you know, it happens,” Zuckerberg said.

Meta has been developing its smart glasses with eyewear giant EssilorLuxottica since 2019, and last year renewed a long-term partnership agreement to continue making the products.

The company on Wednesday also debuted the Oakley Meta Vanguard smart glasses, intended for athletes who participate in high-intensity sports like snowboarding and mountain biking. The Oakley-branded glasses will cost $499 when they launch on Oct. 21, making it $100 more expensive than the Oakley Meta HSTN glasses that went on sale in June.

The Oakley Meta Vanguard smart glasses have a sportier look than the Oakley Meta HSTN glasses thanks to a wraparound design that extends its colorful lenses around a person’s temples. Unlike the Oakley Meta HSTN glasses, the new model contains a button on the underside of its frames so that athletes who wear helmets can more easily capture photos and videos.

The new sports-centric smart glasses have up to nine hours of battery life, can capture 3K video and contain speakers that are louder than their predecessors. The glasses can connect with Garmin-branded fitness watches to track certain stats like their heart rates using the Meta AI assistant. Preorders start today.

Meta also debuted the Ray-Ban Meta (Gen 2), the latest version of the company’s original smart glasses. The Ray-Ban Meta (Gen 2) costs $379, up from $299 for the version released in 2023. The Ray-Ban Meta (Gen 2) has double the battery life of the previous model, lasting 8 hours on a single charge, and a more powerful camera that can capture 3K Ultra HD video. The new glasses go on sale today.

Zuckerberg also announced Horizon TV, pitching it as a way to watch television shows, sporting events and movies using the company’s Quest VR headsets. Some of Meta’s partners who will be contributing content to the app include Disney and Universal Pictures, Zuckerberg said.

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Netskope prices IPO at $19, valuing company at $7.3 billion

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Netskope prices IPO at , valuing company at .3 billion

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Cybersecurity company Netskope is eying a $7.3 billion valuation after pricing shares at $19 for its upcoming IPO, at the top end of its expected range.

Netskope will start trading on Thursday on the Nasdaq under the ticker symbol “NTSK.” The share sale raised $908.2 million.

Earlier this week, Netskope lifted its expected pricing range to between $17 and $19 a share, up from an original range of $15 to $17. The company revealed plans to go public last month.

Netskope’s offering comes amid a hot period for IPO activity after a years-long lull spurred by step inflation and soaring interest rates. The long-overdue resurgence has fueled optimism on Wall Street and in a venture capital industry eager for return on investment.

Ticket reseller StubHub slid 6% it its first day of trading Wednesday, but a lackluster start may not be reason for concern. CoreWeave went public in March and closed flat in its first day, with shares going on to triple.

Swedish buy now, pay later firm Klarna jumped 15% in its debut this month. Peter Thiel-backed cryptocurrency exchange Bullish, design software company Figma and stablecoin issuer Circle have also jumped since their recent market debuts.

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The cybersecurity sector is also undergoing a busy stretch for dealmaking fueled by ongoing artificial intelligence advancements and a shifting threat landscape.

This year’s biggest tech deals include Google’s whopping $32 billion acquisition of Israeli cloud security startup Wiz and Palo Alto Network‘s $25-billion CyberArk buyout. Thoma Bravo-backed SailPoint went public in February after the private equity firm took it private in 2022. Cybersecurity competitors CrowdStrike and Zscaler have also made acquisitions this year to beef up their offerings.

Santa Clara, California-based Netskope was founded in 2012 and is led by co-founder and CEO Sanjay Beri. At the end of July, the company said it had 2,910 employees and 4,317 customers across 90 countries.

Netskope says it competes in the IT security vendor and networking space against the likes of Broadcom, Cisco, Palo Alto Networks and Zscaler.

Annual recurring revenues rose 33% to $707 million at the end of July and revenues reached $328 million for the six months ended July 31. The company also reported a net loss of $170 million during that period.

Some of Netskope’s significant backers include Accel, Iconiq and Lightspeed Venture Partners.

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AI startup Nscale came out of nowhere and is blowing away Nvidia CEO Jensen Huang

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AI startup Nscale came out of nowhere and is blowing away Nvidia CEO Jensen Huang

Nscale, the UK-headquartered AI infrastructure provider.

Courtesy: Nscale

Two years ago, Nscale was a brand new startup in the U.K. that had yet to raise any outside funding or officially announce its existence.

Last year the London-based company came out of stealth, and in December announced that it had raised its Series A fundraising, totaling $155 million.

Now, Nscale finds itself at the center of the action in the hottest market on the planet: artificial intelligence. And it has close to $700 million in fresh capital from Nvidia, the world’s most valuable company.

In press releases on Tuesday, Nscale was named as an AI infrastructure partner for Nvidia, Microsoft and OpenAI, as the companies expand their buildouts in the U.K. Nscale then said it signed a five-year $6.2 billion agreement with Microsoft and Aker to develop “hyperscale AI infrastructure” in Europe, specifically Norway, where Aker is headquartered.

OpenAI made prior headlines with Nscale, announcing plans in July for a data center in Norway for a Stargate-branded AI data center. Nscale agreed to commit $1 billion for the project, with the goal of racking up 100,000 Nvidia graphics processing units (GPUs) at the site before 2027.

It’s a remarkably quick rise for a company that wasn’t even around when OpenAI kicked off the generative AI boom with the launch of ChatGPT in late 2022. At that time, what’s now Nscale was part of Arkon Energy, which was established a year earlier to provide infrastructure for cryptocurrency mining. Nscale was spun out to address soaring demand for data centers capable of handling AI workloads.

Read more CNBC tech news

Like CoreWeave, which went public this year and now sports a market cap of $58 billion, Nscale is combining data center space, power and lots of GPUs with its own software in order to an provide end-to-end service for AI infrastructure.

CoreWeave, which supplies infrastructure to Microsoft, Google, Nvidia and OpenAI, also has roots in crypto. Founded in 2017, the company built up its initial fleet of Nvidia GPUs for ethereum mining before pivoting to AI.

Nscale didn’t respond to a request for comment following this week’s announcements, but CEO Josh Payne, who previously founded Arkon, told CNBC in late July that the company was targeting two big problems in Europe. One is a lack of sufficient computing capacity and the other is a “very fragmented market.”

“What the continent needs is large AI infrastructure projects deploying compute [power],” Payne said, after the announcement with OpenAI for the Norway buildout. “The ecosystem can consume from the project to build AI products, to generate productivity growth and economic benefit.”

Payne wrote in a LinkedIn post on Wednesday that the agreement with Microsoft and Aker is a “huge win for European-owned AI infrastructure.”

Europe has been pushing the concept of “sovereign AI,” requiring data centers and AI workloads to be located and processed on European soil. Nscale has quickly emerged as an important player in the U.K.’s bid to evolve into a global leader in AI. In January, Britain laid out an AI “action plan,” promising to reduce bureaucracy to help its domestic AI sector thrive.

Trump’s UK trip sparks tech investment splurge

While Nscale is addressing the European market, many of its early partners are big U.S. AI vendors. They timed their announcements on Tuesday to President Donald Trump’s state visit to the U.K.

On Wednesday, Trump visited Windsor Castle and met with King Charles, Queen Camilla and other members of the royal family. His trip comes at a contentious moment for U.K. Prime Minister Keir Starmer, who is under pressure to bring stability to the country after the exit of Deputy Prime Minister Angela Rayner over a house tax scandal and a major cabinet reshuffle.

Microsoft headlined the U.K. announcements, committing $15.5 billion of new investment to computing equipment. The software giant said it plans to work with Nscale to construct what will become the U.K.’s largest supercomputer in Loughton, a suburban town in the English county of Essex.

The site will initially house 23,040 Nvidia Blackwell GPUs to be delivered in the first quarter of 2027. When it goes live, it will generate 50 megawatts of AI capacity, scalable to 90 megawatts, according to a statement from Nscale.

“No one can make that kind of capital investment unless they’ve got somebody already committed to spend the money once the work is complete, and that’s the role we’re playing,” Microsoft President Brad Smith said Tuesday, adding the deal represents a major vote of confidence in Nscale.

OpenAI said it would launch a U.K. version of Stargate through a partnership with Nscale and Nvidia. OpenAI will deploy 8,000 GPUs in the project’s first phase early next year, with the option to expand capacity to approximately 31,000 GPUs over time.

Stargate U.K. will operate across a number of sites in the country — one of the early ones being Cobalt Park, an industrial state in the Northern English city Newcastle. Stargate was initially spawned in the U.S. in January as part of President Trump’s effort to push investments in AI infrastructure.

Nvidia CEO Jensen Huang attends the “Winning the AI Race” Summit in Washington D.C., U.S., July 23, 2025.

Kent Nishimura | Reuters

Nvidia’s announcement on Tuesday included an investment of up to £11 billion ($15 billion) with Nscale and CoreWeave to boost U.K. AI infrastructure.

Nvidia CEO Jensen Huang separately revealed on Wednesday that the chipmaker had made a £500 million ($683 million) equity investment into Nscale.

“We convinced ourselves that Nscale could be a national champion for AI infrastructure in the U.K.,” Huang told journalists at a press conference in London.

Nick Patience, AI practice lead at the Futurum Group, told CNBC that Nscale is “a key part of Nvidia’s push in the U.K. market and an acknowledgment by the government that it has to do something to get the AI infrastructure built here, which has been a long slog.”

Rapid growth

After exiting stealth in May of last year, Nscale’s first public announcement came two months later, when the company partnered with UAE’s Open Innovation AI to deploy 30,000 GPUs. Around the same time, Nscale said it was acquiring Kontena, which was founded in 2018 and specialized in high-performance computing data centers.

The next month, Nscale announced an agreement with Asian telecom company Singtel to offer a “GPU-as-a-Service (GPUaaS),” and serve customers in Europe and Southeast Asia. Initially, Nscale’s infrastructure relied on GPUs from Advanced Micro Devices. Today, the startup promotes various offerings from market leader Nvidia.

Nscale’s big financing landed in December, when the company said it raised $155 million in a round led by Sandton Capital Partners, with participation from Kestrel0x1, Blue Sky Capital Managers and Florence Capital.

Sandton co-founder Rael Nurick said in the press release that with its “unique vertically integrated approach, Nscale is building the hyperscale AI platform to power AI at scale.”

Nscale said at the time that it had grown its AI data center pipeline to 1.3 gigawatts from 300 megawatts the prior year to and that it was aiming to have 350,000 GPUs running by the end of 2027.

By comparison, CoreWeave said at a banking conference last week that its portfolio consists of “about 2.2 gigawatts of capacity that’s coming online.” The company said in its IPO prospectus in March that its 32 data centers were running 250,000 GPUs.

It’s been a whirlwind few years for Payne, Nscale’s founder. While he was serving as executive chairman of Arkon, he was also operating chief at Australia’s Battery Future Acquisition Corp., a blank check company that says it’s “targeting critical battery minerals and related supply chains.”

He’s got a lot of work in front of him.

Building out AI data centers with costly GPUs is a capital intensive process that’s historically required a hefty amount of debt. CoreWeave had raised a total of $12.4 billion in debt through the end of 2024, in addition to well over $1 billion in equity financing before its IPO. It announced a $1.5 billion bond sale in July after a $2 billion debt offering in May.

Nscale was trying to raise $1.8 billion earlier this year through a private credit deal led by bankers at Goldman Sachs, according to Bloomberg.

In the December video tied to Nscale’s equity fundraising, Payne called it “one of the largest Series As raised in U.K., European history.” He said the company would use the cash to deploy up to another 4,000 GPUs in its data center in Norway and to develop up to 180 megawatts of capacity in the company’s portfolio.

The aim, Payne said, was to deploy 50,000 GPUs by the end of 2025 and 150,000 by the end of next year.

“The key challenges that we see in the market is the significant increase in density at the GPU level,” he said. “This funding allows us to scale up materially” he said, and to become “one of the largest players in Europe.”

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