A cover installation apparatus installs continuous lengths of flashover protection covers around energized electrical power lines. The apparatus includes a cover assembly housing that takes a flat, extruded length of material and forms the material into a closed circular shape surrounding a power line. The cover assembly housing includes opposite first and second ends, with an inlet port in the first end and an outlet port in the second end. An interior passageway extends along a longitudinal direction from the inlet port to the outlet port and is configured to receive the power line therethrough. The interior passageway also provides a path for the flexible panel to follow from an uninstalled configuration to an installed configuration surrounding the power line.