If not 240 or 208, almost never 120 volt, to much voltage drop and the conductors get to large.
I figured that 120V might give voltage-drop problems with the length of runs involved, but the guy with the street PC seems to have 120 available at that lamp post (unless he had his computer set up for 240V operation).
A higher voltage system with a xfmr every so many poles to provide a 120 utility outlet sounds a reasonable solution.
