The accident happened shortly before 2 p.m. Saturday afternoon at Lake O' the Pines Marina on Alley Creek in Marion County Texas.
The Scouts were sailing in a Hobie Cat on the Lake O' the Pines when the catamaran's mast snagged the transmission cable.
Wardens found the boat on fire about 300 yards from power lines.
Two of the boys were killed after investigators believe they were electrocuted. An 18-year-old died while still on the boat.
Both reportedly suffered severe injuries. A third casualty, 11-year-old Thomas Larry was discovered inert in a vessel adjacent and was given CPR by a couple of good Samaritans.
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The boy was taken to LSU Medical Center in Shreveport where he remains in critical condition.
A Scout official says a Scout leader quickly reached the boat, but the two older teens were already dead.
The mischance is being researched by the Texas Parks and Wildlife Department's statewide sculling mishap recreation and mapping group.
"We have to come together as a scout family and make sure we are supporting those who are carrying quite a weight right now", Anderson said.
Dozens of friends, family and fellow Boy Scouts attended a candlelight vigil Sunday to remember the victims.
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"This is an extremely hard time for our Scouting family", the Boy Scouts of America's East Texas Area Council Chief Executive Dewayne Stephens said in a statement on Saturday.
A GoFundMe page set up to support the family of survivor Thomas stated doctors are "not very optimistic" about his chances of recovery. "Our thoughts & prayers go out to the Boy Scouts & their families".
"And I have told him that I want him here with us, selfishly, but I understand if he needs to go home".
All three scouts were wearing personal floatation devices at the time of the incident.
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