A desktop running a low usage wouldn't consume much more than a NAS, as long as you drop the video card (which wouldn't be running anyways).
Take only that extra and you probably have a few years usage before additional electricty costs overrun NAS cost. Where I live that's around 5 years for an estimated extra 10W.
Like it did in the US in the 1930-60s. Not gonna reinvent something that has proven useful and effective enough to create a superpower.
Something something banks?
Power plants are a perfect example of infrastructure that need to be national and not private in order to be technically and financially efficient. Running them for profit either means you end up overlooking safety for profit (see David Besse) or hiking the selling price which is detrimental to both your industry and population.
Large buildings are just not on the same financial scale or are just uselessly tall.