@thomasfuchs I did the math, and stupid doesn't begin to cover them.
And boy howdy. Freeman Dyson didn't even remotely go far enough and Kardashev was smoking crack.
Any society which could even *begin* to construct such a sphere, would NECESSARILY already have power generation technology vastly exceeding the potential gain. It would be a net loss! The only people who would continue to propose such absolute idiocy would be - you guessed it - idiot grifters and politicians!