Not sure where I've read this, one of the main causes is supposedly ship ownership. Firms that operate ships pay for the fuel and would benefit from the retrofi

Not sure where I've read this, one of the main causes is supposedly ship ownership. Firms that operate ships pay for the fuel and would benefit from the retrofit for some specific routes. Outside a few that operate their own fleet, most are rented and mounting something expensive for no benefit to themselves and questionable benefit outside of areas with trade winds would be pretty idiotic from that perspective. What would make it successful is some kind of mandate for a certain percentage of power needing to come from wind. The invisible hand of the market keeps burning the cheapest thing all day long if you leave it to its own devices. The bottom line is though that cargo shipping is a time sensitive thing in today's world and wind does not cooperate with timetables. Saildrones and sailing yachts are the only good fits for it, since neither is in much of a hurry. Commercial shipping probably needs renewably generated biofuel to run carbon neutral and still function as we know it.