I've flown under power lines before, intentionally, they spanned across the river we were operating out of, and were very high. The trick is to not hit them when above or below, ie don't use the through option. Flying under a normal power line on farmland, hmm, good luck sighting the single wire between the poles, your eyes are better than mine, and without sighting you are guessing how much sag is in the line between poles.
I know one account of a C152 hitting powerlines from below (single wire farm line), ripped a few feet out of the leading edge but flung it back into the sky, and they made it back to the airport using full power just above the stall.