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Getting a commercial reactor online by the 2030s doesn’t sound as crazy as it used to.
There’s a reason they call a seemingly impossible technological reach a “moonshot.” Over the years, the term has been used to refer to virtual reality, self-driving cars, and biometric identification such as DNA fingerprinting. Now, it’s fusion’s turn.
“Where we are on fusion is kind of where we were on getting to the moon when Kennedy gave his speech,” Phil Larochelle, a founding partner at Breakthrough Energy Ventures who leads its fusion investment strategy, told me, referencing John F. Kennedy’s 1962 speech about putting a man on the moon by 1970. “Did they have any idea how they were going to make a guidance computer that was actually going to get on the moon? No. Did they have the rockets that they needed that were strong enough to get to the moon? No. And so it’s kind of like that in fusion.”
There have already been some high-profile milestones over the past few years. Toward the end of 2022, the National Ignition Facility at Lawrence Livermore National Lab beat breakeven, creating a fusion reaction that produced more energy than it took to heat up the fusion plasma. Or when the startup Commonwealth Fusion Systems, a.k.a. CFS, announced that it had developed a new type of extremely powerful magnet to better contain and control superheated plasma. Now, startups and investors think the next decade will be critical for commercialization.
“When we started BEV, we kind of assumed that fusion was going to be too far off,” said Larochelle. But after talking with CFS and learning more about the company’s magnet tech, minds changed. Breakthrough invested in the company — and eventually three other fusion startups, too. “These better magnets matter a lot,” Larochelle told me. “It matters as much as the transistor did to a computer. It’s that level of component level breakthrough that totally changes the game.”
For the ordinary optimist, fusion energy might invoke a cheerful Jetsons-style future of flying cars and interplanetary colonization. For the cynic, it’s a world-changing moment that’s perpetually 30 years away. But investors, nuclear engineers, and physicists see it as a technology edging ever closer to commercialization and a bipartisan pathway towards both energy security and decarbonization.
To some extent at least, the data backs them up. According to the Fusion Industry Association, over 60% of all private fusion companies were founded in 2019 or later. And in the past three years alone, fusion companies have brought in over $5.1 billion, over 70% of the sector’s total funding since 1992.
“We would hope to see a breakeven moment by private companies in the next two to three years, by 2028-ish,” followed by a commercial reactor in the mid-2030s, Julien Barber, an investor at Emerson Collective, told me. Thus far, Emerson, which is headed by Laurene Powell Jobs, has invested in two fusion companies, CFS and Xcimer Energy.
The major players in the startup ecosystem say they’re on track to get there. “The progress has actually been faster than Moore’s law,” Ally Yost, senior vice president of corporate development at CFS, told me, “but people weren't looking at that.”
Moore’s law is a prediction — largely validated for decades — that the number of transistors on a microchip, and thus a computer’s processing speed, would generally double every two years. The performance of fusion reactors, especially the donut-shaped tokamak reactors that CFS uses, has historically improved at an even faster rate. But due to some midcentury researchers and technology enthusiasts overpromising on the near-term feasibility of fusion, cynicism remains. It also doesn’t help that the large, intergovernmental fusion megaproject known as ITER has consistently faced delays and huge cost overruns due to the technical complexity of the project, as well as the difficulty of wrangling 35 countries to work together.
Thus far, though, the private sector is faring better. CFS has raised over $2 billion, more than any other private company in the space. It uses an approach known as magnetic confinement fusion, which involves using strong magnets to confine fusion fuel in the form of a plasma. If you can keep the plasma dense enough and hot enough for long enough, atoms start fusing together, releasing a vast amount of energy in the process. ITER, as well as startups including Type One Energy, Thea Energy, and Renaissance Fusion are pursuing the same fundamental route, though with their own technical twists.
Lawrence Livermore, on the other hand, achieved its breakthrough fusion reaction (which it’s since repeated several times) using an approach known as inertial confinement, in which powerful lasers fire at a pellet of fusion fuel, causing rapid compression and heating that leads to nuclear fusion. But the national lab is not aiming to create a commercial reactor. So when the founders of the startup Xcimer Energy saw that the National Ignition Facility was closing in on its goal, they jumped to get inertial confinement tech ready for market.
“In August of 2021, NIF achieved a fusion gain of about 0.6,” Xcimer’s President and CTO, Alexander Valys, told me, referring to the ratio of the energy generated by the fusion reaction to the energy required to heat the fusion plasma. An energy gain of one constitutes breakeven, so the moment didn’t get any mainstream press to speak of. “But inside the field, everyone knew that the previous NIF shot record was effectively a gain of like 0.01,” Valys said. The massive jump indicated to him that, “If we’re going to do this, we have to do it now.” Since then Xcimer has gotten backing from the biggest names in the space, including BEV, Lowercarbon Capital, and Emerson Collective, as it looks to build lasers at lower cost and higher power.
One thing that ties fusion’s various technical approaches together is the fact that they’ve all benefited tremendously from advances in supercomputing, which allows researchers to better model plasma physics and rapidly simulate fusion experiments. “It’s really taken the advent of modern computational methods and supercomputers to be able to model that process with sufficient accuracy, that you can actually develop a machine that recreates those conditions,” Christofer Mowry, CEO of the magnetic confinement startup Type One Energy, told me.
At this point, many leading companies say that the problem is no longer about basic science, but cost. Clea Kolster, head of science at Lowercarbon Capital, told me that once CFS turns on its demonstration reactor, the company knows its fusion gain will be “at least greater than two.” (Lowercarbon is a CFS investor.) That said, there’s still loads of uncertainty around the reactor’s performance, as outside studies project that its energy gain will be more like 11 — although even that might not be enough for it to make economic sense.
So while the economics of fusion are a large part of what venture capitalists are betting on these days, private investment in the industry has actually fallen over the past two years, after peaking in 2022 at $2.8 billion. “A step change in growth will be required once private companies deliver results on their prototype machines,” Andrew Holland, CEO of the Fusion Industry Association, said in a statement, adding that last year’s $900 million in funding “will not be enough to deliver fusion’s ambitious goals.”
To date, government funding has comprised a mere 6% of the industry’s total, but contra the private funding trend, that figure has been ticking up as of late. Last year, the Department of Energy announced $46 million in funding for eight private fusion companies to help the administration reach its goal of demonstrating fusion at pilot scale within a decade.
All the companies I spoke with were awardees, and all agreed that much more would be needed, pointing to the public-private partnership between NASA and SpaceX as a model for how the government could more deeply support commercialization of fusion. That partnership was the product of NASA’s Commercial Orbital Transportation Services program, designed to catalyze the development of private spacecraft and funded to the tune of $800 million.
China, meanwhile, is outspending the U.S. on fusion, just as it’s done with solar, and launched a national fusion consortium at the beginning of this year.
“We are about to harness the sun a second time, and we can’t make that mistake again. We have to get serious about building this industry here in the United States,” Clay Dumas, a partner at Lowercarbon Capital, told me. The firm has a dedicated $250 million fusion fund, and has invested in a total of eight companies in the space, spanning a wide array of technical approaches. “That is going to take the combined efforts of investors and entrepreneurs and policymakers and energy companies and governments to make sure that we can drive this forward on the timeframe that it needs to happen.”
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Europeans have enjoyed it for years. Now, through careful state interventions and creative salesmanship from startups, Americans are close to having their turn.
For U.S. consumers, going solar is usually a major undertaking, involving tens of thousands of dollars, months of logistics, a slew of financing options, and ever-changing incentives.
But in Germany, upwards of a million customers — homeowners and renters alike — are simply plugging in small, affordable solar arrays to standard power outlets. These small systems are, by law, 800 watts or less, a fraction of the size of a typical rooftop solar system in the U.S. Often called “balcony solar,” these panels can live essentially anywhere with sufficient sunlight: on balconies or patios, or mounted on exterior walls or flat rooftops.
But while governments across the EU have simplified regulations to make installation a quick, DIY process, and utility approval little more than a formality — unleashing a wave of consumer demand in the process — the U.S. has so far failed to follow suit. Here, utility regulations prohibit customers from feeding power back into the grid without a formal interconnection agreement, a process that involves lots of time and paperwork.
Utilities in the U.S. want to account for all electricity sources on the grid, since theoretically, even small plug-in systems could have a cumulative impact on local voltage and power quality, whereas in Germany, for example, this is less of a concern. There, plug-in solar-specific policy caps these systems’ generating capacity, and the grid and metering infrastructure has been more extensively modernized to handle distributed energy generation.
Now, however, there are a number of domestic plug-in solar startups finding creative ways to navigate the constraints of the U.S. market. One of them, the nonprofit Bright Saver, announced on Wednesday that it’s raised $500,000 in new funding from TrueVentures.org and a handful of individual backers. The company gets around power export regulations by selling panels with very low wattage. “So we’re talking 200- or 220-watt systems that never backfeed to the grid, because we think close to every typical household will consume that electricity immediately, simply with the refrigerator,” Cora Stryker, the company’s co-founder, told me.
The San Francisco-based startup has sold a couple dozen systems already and has a waitlist of about 1,500 people, Stryker said. So far, she told me, the majority of this “early adoption crowd” is mainly interested in reducing their own emissions. “We think that’ll change over time,” she said. “The mass adoption in Germany has been driven not by that climate-conscious crowd, but really people who want to save money.”
The main drawback to Bright Saver’s approach, however, is also what makes it possible in the first place: the panels’ incredibly small size, which can’t come close to covering a home’s full power needs. So while the upfront cost of a 200-watt panel is small — $399 at the moment — a customer’s energy savings will also be tiny — potentially on the order of just a few bucks per month. Depending on the location, the savings will eclipse the total cost in about five to 10 years, Stryker told me.
That might not be enticing enough to convince a critical mass of customers to jump onboard the small-scale solar train. But Stryker thinks that getting these products out into the world will help catalyze the type of curiosity and interest that can dovetail into policy change. “Selling product in the next year or two is a small revenue stream for us, but it’s also our theory of change,” she told me. “These need to get out there in order for people to know they even exist.”
Much of Bright Saver’s work involves advocating for easing plug-in solar regulations, which is already starting to happen, bit by bit. In March, the Utah state legislature unanimously passed a bill creating a new category for “small portable solar generation devices” under 1,200 watts, exempting them from interconnection requirements. Stryker told me that Utah’s governor was inspired to introduce the bill after reading a story in The New York Times about balcony solar’s success in Germany.
Now more states, including Vermont, Maryland, and Pennsylvania, are expressing interest in similar legislation. If just a few more get onboard, Stryker told me that would be a critical tipping point. “We’ve had conversations with manufacturers and investors who tell us straight up, they’re not coming to the U.S. market because they see only one state where they’re not going to run into these regulatory concerns,” she said. “They tell us privately, five to seven more states and they’re in. So that’s a key threshold for us.”
But one veteran of the plug-in solar market, Craftstrom, isn’t betting on this happening. The company has been selling 400- to 800-watt systems in Europe since 2017, and expanded into the U.S. a few years later, targeting markets where electricity prices are highest, like California and the Northeast. To deal with domestic regulations, the company patented a new type of meter to be placed inside electric panels that blocks excess power from flowing back into the grid. This prevention mechanism also allows the company to sell larger systems — up to 2,000 watts — in the U.S.
Craftstrom’s chief revenue officer, Ken Hutchings, thinks this type of system is critical for grid safety in the U.S., where distribution networks tend to be older and less standardized than in Europe, and not necessarily built for two-way power flow. This opens up utilities to a good deal of legal liability in the case of equipment failures.
While Hutchings wouldn’t necessarily be surprised to see other states following Utah’s lead, he’s skeptical that the U.S. will become a haven for plug-in solar anytime soon — or even that it’s a good idea. “There’s no risk to one or two guys pushing power back into the grid,” he told me. “But when you have thousands and thousands of people doing it, tens of thousands, and the electric company is not sure who’s doing it, I think that’s where the issue lies.”
Thus far, Craftstrom has sold about 4,000 units in the U.S., with about 500 of those orders coming in the past month alone, Hutchings told me. He attributed the sudden uptick largely to a rush of customers trying to qualify for home energy efficiency tax credits — which he said Craftstrom’s systems are eligible for — before they expire at year’s end.
Craftstrom’s domestic prices are still more expensive than what its own customers in Europe can expect to pay for similar systems due to the extra hardware costs that come along with the specialized meters, as well as the fact that installing these products is not a DIY operation. That means Utah customers should now enjoy the same price relief, since the new state law lifts the grid restrictions that the rest of the U.S. faces. These days, Craftstrom’s more complex hardware plus the cost of labor “just about doubles the cost from what you’re able to get in Utah,” Stryker told me.
Bright Saver sold Craftstrom’s systems when it first started out earlier this year, but chose to discontinue this offering as it “didn’t serve our vision of making this accessible to everyone through cost and self-installation,” Stryker told me. Instead, the organization is focusing on policy changes that will make cheap self-install systems in the 800-watt range feasible in more states. And that means getting legislators onboard with some degree of deregulation, something Stryker acknowledges “has often been a dirty word” in the environmental movement.
“In this case, we need these regulations to get out of the way. They’re outdated. They’re artifacts,” she told me, referring to the requirement that small plug-in systems sign utility interconnection agreements. “I see it as a purple narrative, one that can appeal to values across the political spectrum — energy independence, energy affordability, renters’ rights.”
Of course, Stryker isn’t advocating for complete anarchy in the space. Grid stability is still a concern, and she said that Bright Saver is involved in discussions with regulators and standard-setting bodies to determine acceptable wattage thresholds. Countries that have embraced balcony solar in Europe have “impeccable” safety records, Stryker told me, enabling Germany to raise its wattage limit from 600 to 800 watts at the beginning of last year.
There are still some logistics to work out though. As the recent Utah law is written, plug-in solar arrays must comply with product standards from Underwriters Laboratories, a safety certification body. And while this organization has standards covering the individual components of plug-in solar systems, it has yet to create a systems-level standard. Depending on whom you ask, that might mean all domestic companies in the space are operating in a bit of a regulatory gray area at the moment.
Stryker told me she expects these system-wide standards to be released soon though, ideally in tandem with more bills like the one passed in Utah. “We think it’s a no-brainer.”
On Alaska’s permitting overhaul, HALEU winners, and Heatmap’s Climate 101
Current conditions: Kansas, Oklahoma, and Arkansas brace for up to a foot of rain • Tropical Storm Juliette, still located well west of Mexico, is moving northward and bringing rain to parts of Southern California • Heat and dryness are raising the risk of wildfire in South Africa.
The Trump administration has started the process to roll back logging protections from more than 44 million acres of national forest land. On Wednesday, U.S. Secretary of Agriculture Brooke Rollins proposed undoing a 25-year-old rule that banned building roads or harvesting timber on federally controlled forest land, much of which is located in Alaska. “Today marks a critical step forward in President Trump’s commitment to restoring local decision-making to federal land managers to empower them to do what’s necessary to protect America’s forests and communities from devastating destruction from fires,” Rollins said in a statement. “This administration is dedicated to removing burdensome, outdated, one-size-fits-all regulations that not only put people and livelihoods at risk but also stifle economic growth in rural America.”
Environmental groups slammed the proposal for jeopardizing wildlife habitats and putting waterways at risk. “Communities depend on clear water filtered by roadless areas, animals depend on the unfragmented habitat that can only exist where there are no roads, and anglers depend on clean water in the streams where trout and salmon swim,” Ellen Montgomery, the director of Environment America’s great outdoors campaign, said in a press release. “We cannot let these essential forests be carved up by roads, obliterated by chainsaws, and contaminated by mines.”
Heatmap’s new Climate 101 series aims, as Heatmap deputy editor Jillian Goodman explained, to be “a primer on some of the key technologies of the energy transition.” That includes “everything from what makes silicon a perfect material for solar panels (and computer chips), to what’s going on inside a lithium-ion battery, to the difference between advanced and enhanced geothermal.”
This might be especially helpful for those still trying to find their way into the climate conversation, but we hope there’s something here for everyone. For instance, did you know that contemporary readers might have understood Don Quixote’s “tilting at windmills” to be an expression of NIMBYism? Well, now you do!
The federal Permitting Council signed a first-of-a-kind memorandum of understanding to work together with Alaska’s government to streamline permitting on critical infrastructure projects across the state. First established in 2015, the agency was designed to improve transparency and speed up the greenlighting of infrastructure approvals. But it had yet to forge such a close pact with an individual state. “Our team is ready to work with Governor Dunleavy to bring Alaska back into the energy spotlight, ending the neglect of the Biden Administration and bringing Alaska’s incredible natural resources to the rest of the world,” Emily Domenech, the Permitting Council’s executive director, said in a statement.
Domenech — a former staffer for House Speakers Kevin McCarthy and Mike Johnson who went on to serve as a senior vice president at Boundary Stone, a firm founded by alumni of the Obama-era Department of Energy — acted as something of a Republican sage for the clean energy industry. In an interview with Heatmap’s Matthew Zeitlin after last November’s election, she urged the industry to forge closer relationships with members of the current congressional majority. “If you ask Republicans to be for or against the IRA as a whole, they’ll be against it,” Domenech said, “But Republicans think about energy as a regional issue. So instead of forcing this one size fits all approach, IRA advocates would be smart to give people room to support only the policies that make the most sense for their state or region.”
The Department of Energy selected another three companies to receive a special kind of nuclear fuel from its growing stockpile. HALEU — pronounced HAY-loo, an acronym for high assay low enriched uranium — is a reactor fuel enriched up to four times as much as traditional reactor fuel. The fuel is needed for all kinds of novel reactor designs, particularly those that use coolants other than water. Until recently, however, Russia’s state-owned Rosatom had enjoyed a virtual monopoly over its global supply. The Biden administration set aside billions for HALEU production. In April, the Trump administration selected five companies to receive some of the government-procured supply, including Westinghouse, Bill Gates’ TerraPower, and the Google-backed Kairos Power. Now the agency has picked another three:
Two firefighters battling the Bear Gulch fire on Washington’s Olympic Peninsula were arrested by federal law enforcement Wednesday. The reason for the arrests is unclear, according to the Seattle Times. Over three hours, federal agents from Border Patrol carried out an “operation on the fire,” demanding identification from members of two private contractor crews who were among the 400 firefighters battling Washington state’s largest active blaze. The Incident Management Team from the National Interagency Fire Center suggested that the action did not interfere with the efforts to tamp down the flames.
The American West is primed for wildfires right now. Following a lull in June and July, Heatmap’s Jeva Lange wrote that “the forecast for the Pacific Northwest for ‘Dirty August’ and ‘Snaptember,’ historically the two worst months of the year in the region for wildfires,” was full of warning signs, including low precipitation and abnormally high temperatures.
Living, gnawing weedwackers.Vesper Energy
The 1.36 million solar panels at Vesper Energy’s Hornet Solar farm in Swisher County, Texas, one of the United States' largest single-phase solar projects, were overgrown with vegetation. So naturally, the company brought in sheep. More than 2,000 white, wooly ovines arrived this month and were allowed to roam the facility’s six square miles. “As Texas continues to lead the nation in solar energy growth, solar grazing highlights how innovation can support rural economies, preserve farmland, and strengthen the state’s reliable energy future,” Vesper said.
Here at Heatmap, we write a lot about decarbonization — that is, the process of transitioning the global economy away from fossil fuels and toward long-term sustainable technologies for generating energy. What we don’t usually write about is what those technologies actually do. Sure, solar panels convert energy from the sun into electricity — but how, exactly? Why do wind turbines have to be that tall? What’s the difference between carbon capture, carbon offsets, and carbon removal, and why does it matter?
So today, we’re bringing you Climate 101, a primer on some of the key technologies of the energy transition. In this series, we’ll cover everything from what makes silicon a perfect material for solar panels (and computer chips), to what’s going on inside a lithium-ion battery, to the difference between advanced and enhanced geothermal.
There’s something here for everyone, whether you’re already an industry expert or merely climate curious. For instance, did you know that contemporary 17th century readers might have understood Don Quixote’s famous “tilting at windmills” to be an expression of NIMYBism? I sure didn’t! But I do now that I’ve read Jeva Lange’s 101 guide to wind energy.
That said, I’d like to extend an especial welcome to those who’ve come here feeling lost in the climate conversation and looking for a way to make sense of it. All of us at Heatmap have been there at some point or another, and we know how confusing — even scary — it can be. The constant drumbeat of news about heatwaves and floods and net-zero this and parts per million that is a lot to take in. We hope this information will help you start to see the bigger picture — because the sooner you do, the sooner you can join the transition, yourself.
Without further ado, here’s your Climate 101 syllabus:
Once you feel ready to go deeper, here are some more Heatmap stories to check out: