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Inside episode nine of Shift Key.

Radia is a $1 billion climate tech startup with an unusual pitch: It is trying to build the world’s largest airplane. Its proposed aircraft, the Radia Wind Runner, would be as long as a football field, nearly as wide as a New York city block, and capable of carrying 12 times the volume of a Boeing 747. Such a plane could ferry massive wind-turbine blades, unlocking what the company calls “gigawind” — the ability to build offshore-sized wind turbines on land.
Why is that important? Because the larger the wind turbine, the more electricity that it generates — and the less wind it needs to work with. Radia says that its “gigawind” farms could profitably go into places with slower wind speeds, such as the Northeast or Mississippi Delta. They could also be built in the existing Wind Belt, potentially doubling current output.
In this week’s episode, Rob and Jesse talk to Radia’s chief executive officer, Mark Lundstrom. (Jesse’s consulting firm did some research for Radia while it was in stealth mode, in 2020 and 2023.) We discuss why the world needs a bigger plane, how such a new aircraft gets licensed, and why massive wind turbines could be such a big deal for renewable electricity. Shift Key is hosted by Robinson Meyer, executive editor of Heatmap, and Jesse Jenkins, a Princeton professor of energy systems engineering.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Jesse Jenkins: I’m here in the mechanical and aerospace engineering department at Princeton, so we’ve got a lot of students excited about new aerospace applications. I have a six-year-old kid, as well, and he’s also excited about anything that goes fast and is big, so I’m sure he’ll get excited about the eventual Lego kit for the WindRunner that we’ll have to get out in the world. But talk through the size of this aircraft compared to, say, something we’re used to, like a 737 or more conventional aircraft.
Mark Lundstrom: Sure. So before understanding the size, one has to understand the fundamental mission requirements. And so the goal, Radia’s goal is to be able to move up to a 105 meter long object that could weigh up to 75 tons. Now we can also move multiple smaller blades, so two 95s, or three 85s, or four 75s. So the vehicle is quite versatile.
In terms of sheer size, it’s about 12 times the volume of a 747. So it’s very, very large compared to the 747. It’s about nine times the volume of the Antonovs. And yet what's very different about it —
Jenkins: And the Antonov, that’s the largest plane built to date, right?
Lundstrom: Yes, the largest volumetric plane right now. There’s about 14 or 15 of them left in the world, usually Russian or Ukrainian operated.
Robinson Meyer: I was going to say, I remember the biggest plane in the world being destroyed right at the beginning of the Ukraine War and was wondering how that compared to the to the WindRunner vehicle.
Lundstrom: So the Antonov 225, there was one of them. WindRunner is six times bigger in volume than that airplane was, and it’s nine times bigger in volume than the remaining Antonov 124s that are still out there. And so, and what’s additionally unusual about it, in addition to the size, is its ability to land on dirt.
Meyer: Wow.
Lundstrom: Things like Antonovs, 747s, etc., they need to land on about 9,000 feet of steel reinforced concrete, typically. And we designed the WindRunners so we could land on relatively short dirt strips, so just over a mile of a semi-prepared field. And that allows us to bring the payload into a wind farm, and be able to get a very large aircraft out of the wind farm. It’s probably the first time that an aircraft has been designed to optimize around volume, as opposed to mass.
Usually when an aircraft design team starts off, they’ll start off thinking about how much mass has to be moved. We really started off thinking about how much volume has to be moved. So there are aircraft that move larger mass than the WindRunner. There’s absolutely no aircraft that comes close to moving larger volumes and being able to land that volume on a relatively short dirt strip.
This episode of Shift Key is sponsored by…
Advanced Energy United educates, engages, and advocates for policies that allow our member companies to compete to power our economy with 100% clean energy, working with decision makers and energy market regulators to achieve this goal. Together, we are united in our mission to accelerate the transition to 100% clean energy in America. Learn more at advancedenergyunited.org/heatmap
KORE Power provides the commercial, industrial, and utility markets with functional solutions that advance the clean energy transition worldwide. KORE Power's technology and manufacturing capabilities provide direct access to next generation battery cells, energy storage systems that scale to grid+, EV power & infrastructure, and intuitive asset management to unlock energy strategies across a myriad of applications. Explore more at korepower.com.
Music for Shift Key is by Adam Kromelow.
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Risk-averse but deep-pocked institutional investors join the party.
When the Fusion Industry Association surveyed the sector earlier this month, it found that the industry’s 56 active companies had collectively raised more than $14.2 billion over the past five years. But an ever-larger share of that money is ending up in the hands of one startup: Commonwealth Fusion Systems.
With its latest $1 billion funding round, announced today, the MIT spinout now accounts for nearly 30% of all capital in the industry. The new financing, led by a wave of institutional investors entering the sector for the first time, will support construction of the company’s first commercial power plant in Chesterfield County, Virginia, which CEO Bob Mumgaard says is on track to come online in the early 2030s.
In a media briefing, Mumgaard noted that this latest raise marks “the largest single funding round among fusion energy companies since our last large round of $1.8 billion in 2021.” It brings the total capital raised by CFS to an even $4 billion as the company races to complete construction of SPARC, its demo reactor. If all goes according to plan, it should begin operating sometime next year, proving out the physics and engineering approach underpinning ARC, the planned commercial plant.
The new financing deviates from the typical venture capital round, as it brings in a broad but unnamed mix of “large pension funds, sovereign wealth funds, infrastructure funds doing project finance, and industrial corporates.” These risk-averse investors would typically steer clear of expensive, first-of-a-kind facilities, demonstrating the degree to which CFS has succeeded in building confidence in an industry long critiqued for overpromising and underdelivering.
The company credits the trust it built to its extensive peer-reviewed research as well as its decision to build a tokamak — widely regarded as the most mature fusion reactor design. “I don’t think there’s any other company that’s been as transparent and open with their physics and how it actually works,” Katie Rae, CEO and managing partner at Engine Ventures, told me. Rae has participated in every one of CFS’s funding rounds, and while she says her firm has evaluated virtually every startup in the sector, the company remains its only fusion investment.
But even flush with institutional capital, Mumgaard is clear that the company will need billions more to fully finance ARC and the numerous reactors to follow. It’s unclear where exactly that money will come from, though he’s pushing for government involvement. Alongside the Fusion Industry Association, Mumgaard is advocating for a one-time, roughly $10 billion federal infusion of cash into the broader industry to expand public-private partnerships, build shared research infrastructure, and help finance first-of-a-kind plants in an effort to keep pace with China’s rapidly growing fusion program.
According to reporting from Politico, a Department of Energy official told CFS and other fusion companies that such a level of federal funding is “unrealistic in this environment.” But though insiders argue it’s what the industry needs to scale, Rae says CFS doesn’t depend on it. “I think it is the right kind of investment to make, but we didn’t count on it from an investor perspective,” she told me.
One obvious alternative is the public markets. The IPO window for climate tech has reopened, with geothermal giant Fervo and nuclear fission startup X-energy both completing successful public offerings in recent months. SPACs have also made a comeback, as numerous nuclear companies are opting for this faster, though riskier, path to the public markets. But CFS’s newly appointed CFO, Lorence Kim, said during the briefing that this latest round proves “that the private markets have a lot of capital to deploy toward our mission.” Whether an IPO is in the company’s near future remains an open question, though he cautioned against interpreting his hiring as any indication of “IPO prep in a specific way.”
For what it’s worth though, Kim has taken another high-profile, pre-revenue startup public before: Moderna. As CFO from 2014 to 2020, he helped the company scale its mRNA platform and lead its blockbuster $600 million IPO in late 2018 — the largest ever in the biotech industry at the time. Notably, this all happened before Moderna had an approved product or the Covid pandemic made its signature vaccine a household name, similar to where Commonwealth finds itself today.
“Moderna was in this moment in time where the science worked, and the strategy was focused on execution and scale and deploying capital in a way that could enable real impact on the world,” Kim explained. CFS is now at the same juncture, he said. “And so in the same way that Moderna industrialized mRNA and made it inevitable and made it ubiquitous, it was really clear to me that CFS could do the same for fusion.”
Of course, CFS is not alone in its confidence — other fusion companies are equally bullish on their own approach. Take Inertia Enterprises, a Lawrence Livermore National Laboratory spinout, which last week unveiled its own commercial roadmap for a laser-driven fusion reactor. The company emphasized it’s the only one to have definitively demonstrated the viability of its underlying physics in a real-world experiment, rather than through theoretical work or simulations.
Or take Helion, which has raised $1.5 billion and secured a highly ambitious power purchase agreement with Microsoft to supply electricity to the tech giant by 2028. Or Pacific Fusion, which netted a staggering $900 million Series A to be doled out in milestone-based tranches. There are dozens of others — many with hundreds of millions in funding — pursuing a range of approaches that some of the field’s brightest minds consider technically feasible.
But when I mused to Rae about how exciting it is that institutional investors now appear willing to back an industry once viewed as bordering on science fiction, she was quick to correct me.
“They’re willing to bet on Commonwealth Fusion — that’s what you mean.”
At least one hyperscaler’s big bets seem to be paying off.
This is an edition of Heatmap Daily, an evening review of the day’s news written by our executive editor. Sign up for it here.
Good evening. Let’s start with the news. Meta and Microsoft released their most recent quarterly earnings this evening, and Wall Street was watching to figure out if their enormous AI spending plans are paying off. We were watching because those proposals are shaping one of the most important energy stories today: the data center boom and the sharp return of electricity demand.
The returns were … mixed. Meta missed analysts’ estimates, and its profit fell 14% from the same quarter a year earlier. It increased the lower bound of how much it plans to spend on capital expenditures such as data centers this year, from $125 billion to $130 billion, but left the upper bound of $145 billion unchanged.
Microsoft, meanwhile, said its AI investments are starting to pay off. Revenue at its cloud business, which uses its data center space, increased by 43%, more than analysts expected. It spent $41 billion on capital expenses in the three months ending in June.
Meta’s stock was down 7% in after-hours trading, while Microsoft is up 8%. When Heatmap surveyed climate insiders last year, they ranked Microsoft as among the most decarbonization-friendly hyperscaler and Meta as among the worst.
Permitting odds up — thanks to Shift Key?
I do not regularly follow such things, but this afternoon I was told that the Kalshi market for “Will permitting reform become law this year?” surged to 77% today after trading for days around 50%:
I have no idea why it budged today, but perhaps what moved the market was our new episode of the Shift Key podcast (Apple, Spotify). On today’s show, I spoke with Daniel Palken, a former Capitol Hill policy staffer now at Arnold Ventures, about the current state of permitting reform negotiations in Congress. While we don’t know the exact shape of a deal yet, permitting reform is likely to be the biggest new policy for clean energy that we could get by the end of the year.
Daniel is a fantastic guide to the negotiations, and if you’re curious about the policy at all, I recommend that you listen. Here are few of my takeaways from the conversation:
1. A permitting reform deal will probably have six buckets.
They are (1) changes to the National Environmental Policy Act and the judicial review process that environmental studies face after completion; (2) reforms to the transmission process; (3) changes to the Clean Water Act; (4) a deal to make it harder for presidents to yank permits from approved projects; (5) changes to the National Historic Preservation Act, and (6) “everything else,” a grab bag of smaller fixes including to geothermal energy.
2. Wonky committee politics are shaping the deal.
The National Historic Preservation Act, for instance, is an archeological law that hasn’t been in the mix for previous reform proposals. It’s up for discussion now because Senator Mike Lee of Utah chairs the Senate Energy and Natural Resources Committee — and the NHPA is the major environmental bill under his jurisdiction. Likewise, observers think that a permitting deal has a much better shot of passing during this Congress (as compared to next year) because of an expected series of changes to committee chairs.
3. It’s way, way better to hook data centers to the power grid than run them off behind-the-meter power plants — even if they run off 100% natural gas.
Any permitting reform proposal will seek to expand the transmission system. That could have big benefits for the emissions intensity of data centers. Why? I’ll let Daniel explain:
If you look at the data centers that are hooking up off grid — when they’re not using repurposed jet engines, they’re using 20% thermally efficient gas plants. Whereas if you’re hooked up to the grid, there’s really two types of gas plants that live on the grid. There’s like 60% efficient combined-cycle gas turbines, which are most of the gas power that’s generated, and then there’s peaker [plants], which have low efficiency, but are run at capacity factors of like 5% — so from an emissions perspective, they don’t matter all that much.
So even if solar and wind didn’t exist at all, and nuclear didn’t exist, and hydro didn’t exist, it would still be a much, much cleaner option [to connect data centers to the power grid]. Like we’re talking factors of three in efficiency to connect your data center to the grid if it was purely powered by gas, which is, I think, an important point to understand.
I thought that was an interesting point, and while I’d seen some of those ideas in isolation, I’d never seen them laid out in one place. (And even if grid-scale gas plants are much more efficient than behind-the-meter plants, it’s still even better to power data centers with solar, batteries, and other clean firm power plants — which is also easier when they’re hooked up to the grid.)
I’ll stop glossing the episode and just link to it one more time. Thanks for reading.
On nuclear waste, a Nevada solar farm, and lithium-harvesting nanorobots
Current conditions: France just ordered 4,000 more people to evacuate the wildfires that have now displaced a third of a million people across southwestern Europe • The heat dome in the southwestern United States is driving temperatures in Phoenix up to 113 degrees Fahrenheit by the end of the week • Temperatures in Tuscany are topping 100 degrees this week as Europe’s latest heat wave takes hold.
Just yesterday, I told you that China’s dominance over the manufacturing of the inverters needed to patch solar panels and batteries onto the grid and into data centers had peaked two years ago as Europe’s factories began booming. Hours after the newsletter landed in your inbox, the Trump administration unveiled plans to ban imports of Chinese power inverters in a bid to protect the U.S. buildout of artificial intelligence from sabotage and competition. On Tuesday, the Federal Communications Commission told CNBC its new restrictions aimed to safeguard the AI supply chain “from Chinese threats of disruption, data threat, and cyber attacks.” The measures also bar imports of Chinese-made humanoid and quadruped robots. As you may recall, Reuters broke news in May 2025 that the U.S. government had discovered rogue communications devices in the Chinese-made inverters. The story came out just a month after a frequency problem that stemmed from Spain’s struggle to sufficiently patch all of its solar generation on the grid triggered a blackout across Iberia, highlighting the sort of scenario a compromised “killswitch” device could set off in a bid to attack energy systems.
The ban is good news for America’s beleaguered solar manufacturing industry, which the Trump administration has championed with tariffs but hobbled by axing key federal tax credits that included bonuses for projects using domestically produced panels. T1 Energy, shares of which nosedived this week after the latest quarterly earnings showed losses far outpacing revenue, just spent another $135 million on patents from a rival in Singapore in a bid to vertically integrate production of a more efficient type of photovoltaic technology. Tesla, meanwhile, is promising to “multiply” American solar production by “an order of magnitude.” Yet Elon Musk’s behemoth is cutting long-term deals to buy other people’s solar power. The company just inked an agreement with a KKR-backed solar and battery project in Arizona to buy 90% of its output.

Reasonable people debate just how much electricity is needed to satisfy the demands of the data center boom — and the bears are likely to get a boost amid this week’s selloff of AI stocks. But the latest projections from the Rhodium Group forecast U.S. electricity demand growth to accelerate over the next 15 years, “growing faster than it has since the turn of the century.” Data centers will account for between 62% and 77% of the growth in 2030, and between 59% and 66% in 2040, ultimately reaching 17% of total electricity demand that year. Electric vehicles will make up the second-largest source of new demand growth in the low- and mid-emissions scenarios the consultancy outlined through 2040. In the high-emissions scenario, heavy industry will account for a quarter of the demand growth between 2025 and 2040. Overall, the findings show divergent pathways in the 2030s. By 2040, the U.S. will either reduce its greenhouse gas emissions by 41% below 2005 levels — or just 27%. Across all three scenarios, the “historic influx of renewables” coming online between now and 2030 keeps emissions declining. After 2030, however, the grid’s trajectory either continues to deploy nearly 53 gigawatts of renewables per year through 2040 in a low-emissions scenario or drops to 3 gigawatts per year in a high-emissions scenario where cheap natural gas dominates.
For months now, the Greenhouse Gas Protocol, the nonprofit behind a voluntary but widely used corporate standard for carbon accounting rules, has been revising its approach. Last year, my colleague Emily Pontecorvo explained the stakes of the revision process as an “obscure philosophical battle that could reshape the clean energy economy. In April, she broke news from whistleblowers that the changes underway were drumming up controversy. This morning she’s out with a new story on Greenhouse Gas Protocol’s plans to marry its standard to those by the International Organization for Standardization. The short of it is this: the changes are getting a lot of pushback, and credibility of the forthcoming new standard remains an open question.
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For decades, the U.S. plan to deal with nuclear waste has focused on building a highly controversial repository in the Nevada desert. But that effort, as I explained yesterday, was put on indefinite hiatus in 2010 when the Obama administration canceled funding on behalf of then-Senate Majority Leader Harry Reid, a Nevada Democrat. In the meantime, states such as Texas and New Mexico have demonstrated that both Republican and Democratic governments are still willing to fight efforts to build intermediate-term storage facilities for nuclear waste in their states. On Tuesday, five states officially stepped up and made bids to host what the Department of Energy is calling its Nuclear Lifecycle Innovation Campuses, which will house startups that recycle spent nuclear waste into fresh fuel and medical isotopes. The Energy Department named Utah, Tennessee, Oklahoma, Louisiana, and Idaho as finalists for the facilities. “I’m pleased to announce that after reviewing 28 applications from 26 states, the Energy Department has selected five initial contenders to further explore building Nuclear Lifecycle Innovation Campuses,” Secretary of Energy Chris Wright said in a statement. “These campuses will be massive generators of economic growth, create thousands of high-paying jobs, and be crucial to unleashing America’s nuclear renaissance.”
Just last week, the Energy Department opened the door to nuclear projects sited on floating offshore platforms. It’s a novel idea for the U.S., but Russia launched its Akademik Lomonosov, a floating nuclear station, in 2019 in what is widely recognized as the world’s first real small modular reactor and only operating non-land nuclear plant. A new peer-reviewed study the World Nuclear Association conducted on the Rosatom-owned plant ranked it “on par with Russia’s top units,” World Nuclear News reported.
Trump’s permitting freeze for renewables projects started to thaw for solar in particular earlier this year as the administration faced mounting pressure to stop thwarting the fastest-growing source of power in a country increasingly starved for new and swiftly available sources of electricity. The easing, as my colleague Jael Holzman wrote, was also part of a legal strategy. Regardless of the reasoning, the thaw is continuing — and not just because of the literal heat dome pushing temperatures in the Southwest into the triple digits. On Tuesday, the Department of the Interior’s Bureau of Land Management announced plans to advance a solar project in the Nevada desert. The Mosey solar farm, which would produce enough power at maximum output for 200,000 homes, is now under evaluation at the agency’s Nevada office, the agency notified the Federal Register. The regulator plans to conduct an environmental analysis and a resource management plan tweak needed for a project in a utility corridor. E&E News credited the administration’s shift on this particular project to lobbying by the state’s Republican governor, Joe Lombardo.
The project is part of developer Clearway’s larger efforts in Nevada. Separately, the company has volunteered to scrap one of its other solar projects in favor of building a gas plant, Jael reported this week.
Yesterday, I told you the board of PJM Interconnection had scheduled an emergency auction to drum up 7 gigawatts of additional capacity to supply the electricity demand from data centers starting in 2028. It’s just one incremental way the nation’s largest grid system is “lurching toward reforms,” as my colleague Matthew Zeitlin wrote. It’s also inching toward more actual power infrastructure. On Wednesday, the developer Eolian Energy started construction on Flint Grid, a 1 gigawatt-hour storage project outside Columbus, Ohio. Located near a hub of data center and industrial power users, the Flint Grid project is “the first large-scale battery energy storage system to qualify for the PJM capacity market.” If it comes online in spring 2027 as promised on the project’s new website, it will represent more than half the new battery storage capacity in PJM’s line up for 2027 to 2028. The project is also the first grid-scale battery project permitted by the Ohio Power Siting Board and the largest in the PJM territory to date.
“There’s growing consternation about how the US can rapidly scale infrastructure to support America’s growing electricity demand, but not nearly enough conversation about how to use existing technology to unlock the wasted capacity that already exists on the grid,” Eolian founder and CEO Aaron Zubaty said in a statement. “This project requires hundreds of millions of dollars to construct, and we committed the necessary capital and resources years before today’s demand forecasts became headline news. As policymakers consider changes to competitive electricity markets, it’s critical that they avoid undermining the long-term investments already.”
Lithium production typically involves either mining hard rocks or extracting salts through brines. Both are water intensive processes with considerable environmental tolls. Scientists at Texas A&M University are now developing a new approach involving the deployment of tiny, fish-like swimming nanorobots that capture lithium ions from seawater. Backed by a $1 million Energy Department grant, it’s among more than a dozen projects the agency is supporting in a bid to bolster domestic critical mineral supplies. “Unlike traditional mining that digs up land or pumps brine from underground and requires massive amounts of energy, these autonomous micro/nanorobots move freely through seawater to harvest lithium with virtually zero infrastructure footprint,” Jingjing Qiu, one of the mechanical engineers leading the research, said in a statement.