"and what was the voltage in the wire." You're about 14 years too late to get that information. Post 9/11, anything about everything about infrastructure has become a delicate issue. Utility co's are afraid to comment on anything that could say how they're vulnerable (i.e. where primary feeds are) and especially after the substation in Cali was shot up a year and a half ago, DHS and the electric co's have been roundly criticized for failing to act and take things more seriously.
In 2001 you could go online and get DoE web sites showing the details and choices for demolition tools and procedures, to clear reinforced concrete structures, like building columns. You could go online and get detailed maps showing the internet "backbone" and where the high speed trunk lines ran.
Today? All gone. Ask a utility for details of "critical infrastructure" and you might get all sorts of people upset.
IIRC the "air breakers" at substations, where high tension lines feed neighborhoods, use about a three foot air gap to prevent arc-overs. Any kind of sailboat with an ICW clearance (65'?) passing under an 85' cable, should not have been able to pull an arc off that cable, even in 100% humidity wx.
Betcha a nickel that in six months they'll find the boat was in the wrong place, or something in the cable supports had failed. Power companies generally don't like to electrocute the rate-payers, that stuff is usually well maintained, simply because maintenance costs less than lawsuits.