I am one of the primary instructors for Pacific Gas and Electric for their "Flying in the Wire Environment" class, (the largest utility provider in California and in the top 10 in the US). I have been teaching this class weekly for the last year. The risk in this type of work is NOT the engine failure, it is wire strikes or mis-judging distance. Our class revolves around CRM and having two persons up front, not two engines.
For those spouting the "single engine is bad theory", how many engine failures have occurred in the past 25 years in the wire environment vs other incidents....? I'll wait.....