10k square miles of photovoltaic power plant would cost about 1 trillion current US dollars, even assuming that such a project does not drive the cost down. This is easily achievable and roughly 20 orders of magnitude cheaper than a Dyson sphere.

I trillion is going to dispersal in the AI black hole in the next couple years (in the US), I wish the same money were invested in the clean energy instead.

that's a very nice target to cause a country wide blackout, just saying. It's probably better to built a thousand 10 square mile power plants.