I think we spend around $30 per night to run the generator. Diesel to run the engines is cheap as they do not consume much fuel.

Scuba Doo also has a watermaker.

Warren S/V Scuba Doo
Lagoon 50 (winner of best crewed yacht under 55 feet at the St. Thomas crewed yacht boat show).

https://www.cyabrochure.com/ebn/2307/pdyrX/6642/4///