McDonagh Amusements owner Tom McDonagh said the man died after touching the power line while helping to take down a 60-foot-high roller coaster-style ride called the Fireball.
The victim, who was from Jackson, was in his 30s, McDonagh said. Police were still contacting the man’s family this morning.
Sand Lake is about 25 miles northeast of Grand Rapids.
The Associated Press contributed to this report.