it's just one wire, very thin, on an overhead catenary. Not very noticeable here in Seattle, AND we have that for our streetcar AND a separate (with two wires) for trolley busses. Again, not very noticeable unless you really look hard enough.

OKC sure could redo their poles and lines, but if done right (which all modern systems now-days are) streetcar power lines are hardly noticeable (particularly compared to Light Rail and HSR).