Horrified spectators who watched from across the street captured the incident on video. The platform started swinging around after high winds swept through the area.
The platform repeatedly smashed into the Stantec Tower and broke several windows. The worker fell off the platform, but managed to hold on for dear life.
The worker and at least one other person on the platform were rescued.
Edmonton Fire Rescue Services reported the incident on Facebook. "Eventful, blustery afternoon in downtown Edmonton today. Harsh winds blew scaffolding into the side of Stantec Tower calling on the need for both a Ladder and the Technical Rescue Team. Crew members working on the scaffolding were secured properly via harnesses and are fortunately unharmed."