Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Podcast

Why a Climate Startup Is Building the World’s Biggest Airplane

Inside episode nine of Shift Key.

A Radia Windrunner.
Heatmap Illustration/Radia

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.

Yellow

You’re out of free articles.

Use code: LABORDAY to save 20%.
Subscribe to access Heatmap’s exclusive polling and expert analysis of energy, climate change, and sustainability, now just $99/year $79.20/year.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
AM Briefing

‘Backwards and Poor’

On Palisades’ progress, Taliban minerals, and New York’s climate superfund

Donald Trump.
Heatmap Illustration/Getty Images

Current conditions: Tropical Depression Five is barreling northwest from the Caribbean to Houston • In the Pacific, Hurricane Karina has strengthened into a Category 4 storm, but it’s unlikely to make landfall anywhere • The surface temperature of the Yellow Sea is nearly 85 degrees Fahrenheit, fueling storms across South Korea.


THE TOP FIVE

1. Trump says data center opponents ‘want to end up being backwards and poor’

President Donald Trump is among the few politicians in America willing to stand 10-toes-down in defense of the need to build out more data centers. In a post Monday on Truth Social, the president admonished communities that reject data centers as misguided and foolish. “The only reason that communities throughout the U.S.A. should not want data centers is if they want to end up being backwards and poor,” Trump wrote. “If they want to be successful and rich, with far lower taxes and jobs all over the place, let data reign.” Still, he said “plenty of other places” want them. “If we kill the Golden Goose, you will only have yourselves to blame,” he wrote. “China could not be happier with this anti data center movement.” It’s not a popular stance. Heatmap Pro’s latest polling shows that three-quarters of Americans now oppose data centers built in their backyards.

Keep reading...Show less
Blue
Climate Tech

Odyssey Energy Raises $74 Million to Supercharge Small-Scale Solar

Across the Global South, distributed energy is “leapfrogging a centralized grid,” Odyssey’s cofounder told Heatmap.

Money powering solar.
Heatmap Illustration/Getty Images

As old and increasingly strained as the U.S. electric grid is, Americans can still mostly count on it to keep the lights on. The average U.S. resident experiences just a few hours of power outages each year thanks to the country’s sprawling electricity distribution system. But that level of reliability is far from standard globally. Across parts of Africa, Asia, and South America, grids can be fragmented, undersupplied, and unreliable, forcing businesses to turn to expensive diesel generators for backup power — or even as their primary source of electricity when the grid can’t reliably reach them.

But as energy demand surges across the Global South, diesel prices rise with the ongoing Strait of Hormuz closure, and costs for solar and batteries continue to fall, the economics of energy in emerging markets are rapidly shifting. Commercial and industrial customers are increasingly turning to distributed solar as a reliable, affordable supplement — or alternative — to a conventional grid connection. The problem is that the small and midsize local companies capable of building these projects often lack the cash to purchase panels and batteries upfront. Equipment suppliers, meanwhile are often reluctant to extend them credit because they see the small businesses as too risky.

Keep reading...Show less
Yellow
Daily Briefing

California’s New Gas Pipeline Alternative: Just Paying You

A bill awaiting Governor Gavin Newsom’s signature would require utilities to at least offer to subsidize home electrification.

Gas pipes.
Heatmap Illustration/Getty Images

Going into this final stretch of the summer, I’m keeping an eye on California. Today is the last day for the state legislature to pass bills as part of its 2026 session, and lawmakers have already sent some interesting clean energy proposals to Governor Gavin Newsom’s desk.

On Friday, the legislature passed the Home Energy Choice Act, a bill supporting the transition to all-electric homes in the state, which builds on a growing set of policies and programs I’ve been writing about called “non-pipeline alternatives.”

Keep reading...Show less
Green