The market-based solution for that of course would be to engineer municipal power to the docks along with estimated costs for the project. Set a required minim

The market-based solution for that of course would be to engineer municipal power to the docks along with estimated costs for the project. Set a required minimum risk-weighted profit to the city of 2x or so. Then solicit bids for binding long-term contracts from cruise companies, with the stipulation that their generators stay off while in port. If no bids meet the minimum, shelve the whole thing. Otherwise, proceed and enjoy the boost to the city treasury. Of course in the real world this would be a political process and highly vulnerable to corruption by private interests.