[fit2rule]

I guess the point is that these systems have to be retrofitted to existing ships. The ship owners don't see the benefit - it costs them to do the modification - and the ship renters don't see the benefit, because ultimately the owner passes on the modification costs to the renter, displacing the fuel cost savings.

Whats needed is for regulation to come in and say 'ships that have these systems pay less to dock in port' or whatever. But, the technology has to be proven to reduce costs and carbon footprint - so someone needs to make an investment to prove this works before governments will get behind it.