

Not that I’m aware of. All our nuclear commercial power plants are just plain old nuclear energy boiling water. We’re gonna use a damn Dyson Sphere to boil water…
We have bombs that use a similar starting mechanism, but they aren’t exactly useful energy production.
It was a joke. We have invented fission and fusion, but the reactors are still attached it to a Rankine Cycle.
Also, the radius would be considerably larger than the sun. Perhaps not encapsulating The Earth, but that seems like a potential death sentence, if we built a Dyson Sphere rather than a Dyson Swarm