Some opponents suggest the Line 9 reversal is ultimately so Enbridge can transport oil to the Atlantic coast for export, something the company denies.
The final day of the hearing at which Enbridge East was to present its final arguments was postponed because of security concerns.
Dozens of protesters rallied outside the site of the hearing to oppose Enbridge’s plan to reverse its line and increase its capacity to carry bitumen. They maintain the pipeline isn't up to the task, thereby increasing the liklihood of a spill happening.