And as Bent Flyvbjerg mentions in "How Big Things Get Done", projects that last for a very long time are all but guaranteed to encounter one or more black swan

And as Bent Flyvbjerg mentions in "How Big Things Get Done", projects that last for a very long time are all but guaranteed to encounter one or more black swan events and/or recessions. Bent makes a sensible argument for SMR reactor technology in that book too.