The final cost of the project is impacted by many factors, including the volume of used nuclear fuel to be managed. 

Based on the latest projection, at the end of the planned operation of Canada's existing nuclear reactors, the number of used fuel bundles could total up to about 5.2 million. This places the cost of the project at an estimated $22.8 billion (2015 $).

The NWMO updates the cost estimate at least every five years.