What's Next with Philip Meissner
Oct 20, 2026 · 27 min · 10 segments
A sun we can switch on. Enough fuel for a billion years. How close are we to turning that promise into electricity? **Brandon Sorbom, cofounder and Chief Science Officer of Commonwealth Fusion…
Brandon SorbomGuest
Philip MeissnerHost
There's definitely this perception because what happened was people got very excited in the early days and said, you know, it's right around the corner.

And a lot of the scalings that people had basically didn't pan out the way that they thought.

And so when people said, okay, we're a factor of a million away from getting to break even.

And, you know, we're doing a bunch of little experiments down here and we extrapolate.

then, you know, instead of being a line or a quadratic curve like people thought, it actually, there was some fits and starts along the way of getting there.

It's kind of like an analogy I like to use is if you're flying a kite and you say, okay, I'm going to take the principles from the kite and design a rocket to take me to the moon, that's a pretty big jump.

But if you have something like a supersonic jet already and you're extrapolating, okay, I want to build a rocket from that, or even more, you have a rocket that can get to low Earth orbit and you're saying, now I want to build a rocket to get to the moon, the gap is much smaller.


And so we're actually at the point where instead of being a factor of a million away from break-even, we're less than a factor of two away from break-even.

A lot of the breakthroughs have been we've built machines and we've learned a lot.

And so this particular type of machine called a tokamak or a magnetic bottle, it's basically a donut-shaped magnetic bottle that uses magnets to squeeze this fusion plasma in.

There's been about 150... tokamaks built since the like the late 1950s and so these devices i would say the the progress it's been more steady than big leaps and the thing that's changed now is that we have much more in the last sort of like 10 years we've sort of unlocked much more powerful magnets that will allow us to build devices at higher performance without the size getting larger and larger

There's definitely this perception because what happened was people got very excited in the early days and said, you know, it's right around the corner.

And a lot of the scalings that people had basically didn't pan out the way that they thought.

And so when people said, okay, we're a factor of a million away from getting to break even.

And, you know, we're doing a bunch of little experiments down here and we extrapolate.

then, you know, instead of being a line or a quadratic curve like people thought, it actually, there was some fits and starts along the way of getting there.

It's kind of like an analogy I like to use is if you're flying a kite and you say, okay, I'm going to take the principles from the kite and design a rocket to take me to the moon, that's a pretty big jump.

But if you have something like a supersonic jet already and you're extrapolating, okay, I want to build a rocket from that, or even more, you have a rocket that can get to low Earth orbit and you're saying, now I want to build a rocket to get to the moon, the gap is much smaller.


And so we're actually at the point where instead of being a factor of a million away from break-even, we're less than a factor of two away from break-even.

A lot of the breakthroughs have been we've built machines and we've learned a lot.

And so this particular type of machine called a tokamak or a magnetic bottle, it's basically a donut-shaped magnetic bottle that uses magnets to squeeze this fusion plasma in.

There's been about 150... tokamaks built since the like the late 1950s and so these devices i would say the the progress it's been more steady than big leaps and the thing that's changed now is that we have much more in the last sort of like 10 years we've sort of unlocked much more powerful magnets that will allow us to build devices at higher performance without the size getting larger and larger
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