No one does this. There is zero value, economic or otherwise, in turning off machines.

I've never heard of anybody shitting a DC down off peak. Been around 30yr or so.

> why not shut down if there's no actual priority work and there's also no idle priority opportunistic load either...

Full shutdown and startup often kills capacitors and used to be dangerous for rotational HDD.

Sometimes once you turn things off, they simply don't come back on. It happens.