I am uniformed on this, but those industries likely take time to scale up. A large scale desalination plant requires a significant amount of infrastructure.
No one will want anything from your desalination plant in Norway, and shipping water is not a thing because it becomes too expensive.
The next problem is energy cost vs. duty cycle. The less you run due to only utilizing cheap prices the higher the impact of fixed costs on your business.
Except for a significant portion of the GDP of Fiji