To start with, vessel life extensions are becoming extremely common. Our fleet, as you undoubtedly know, is getting older. We've had significant investment in new vessels, but it will take some time to procure them. In the meantime we have to make major investments to keep the existing fleet going. How much additional time comes from a vessel life extension varies from vessel to vessel, but generally it's five to ten years for the investment.
On the $4 million, it is carry-forward funding that we had intended to spend in the previous year. Because of complications around shipyard time and other things, we've had to include it in the supplementary estimates as part of a carry forward. It funds part of two projects: one on the west coast with the Sir Wilfrid Laurier, and one on the east coast with the Alfred Needler.
The $23 million for vessel refit corrects what has been a difficult issue for us. We have covered vessel refit costs from major capital sources, operating sources, and minor capital. Each had an authority to do very specific things, and it made it very difficult to manage when we drew from the same pots of money for one project.
So we went to the Treasury Board to create a new general refit authority within major capital. We're transferring what had previously been in operating into that authority so we can have one global refit budget.
It is a bit different from vessel life extensions. Vessels require repairs and upgrades on an ongoing basis, and sometimes they can be significant. But they're different from a major vessel-life extension, where we do very significant work and generally spend anywhere from $6 million to $15 million on one life extension.