Cost is one thing, the other is whether it will be permitted at all.

Then there's the power grid problem.

I understand expanding the grid takes a long time, thus the gas turbines. Which I understand are also supply-constrained, and environmentalists are not happy either.

I'm no scientist or financial analyst, but I could imagine that the space thing would be viable especially in a scenario where AI capabilities continue to grow.

If AI really does replace not only most knowledge work but also other labor via robotics, and this requires enormous compute, we are going to want to scale this up at a much faster rate.

Preferably without covering a tenth of the planet with gas generators.