Police said the accident occurred during a procession in Machapur in Yellareddy mandal, about 250 km from here.
The tragedy struck the procession when a person carrying 'alam' (symbol) came in contact with a high tension wire. The man - identified as 35-year-old Saiulu - died on the spot.
At least 26 others, including 17 students, were injured. Five of them were in critical condition and were taken to Hyderabad for treatment.