Perhaps I don't understand what you mean by electrocutive, not being a native English speaker and all, but in my home country of the Netherlands over 90% of power lines have been underground since the 50s without any ill effects...
It's not a word, according to google ngram viewer. Two types of usage on google, one dealing with dance music and the other from 100+-year-old periodicals.
They're underground in many US cities, too, including San Francisco.