Interesting thought experiment. I’m a bit of a noob, so I don’t want to point you in the wrong direction.
Assuming no need for cooling ie other, I would expect it to be power (100 kW) / hash rate (i.e. 20 J/THs). With these parameters I’d think it would be ~ 5 PHs for 100 kW.
This tool converts to USD, but might give you some perspective on the potential on the bitcoin side.