such as chargers, grid, and so on. In Finland Föri, the historic Turku city ferry across the Aura River to Abo, was converted to all-electric propulsion in April 2017. The vessel was introduced as a wood-burning steam ferry in 1904, converted to diesel operation in 1955 and now provides a continuous daily service from 0615 to late evening for foot and cycle passengers on battery power. Charging takes place at night. Other projects are considered in Canada, Sweden and Denmark. India's First Solar Ferry, a 75-passenger boat, that is powered by sun and grid charging with lithium batteries, began service in 2017. Based on the predictions of consumption the payback time is 3 years. Some ferries can charge their onboard batteries while docked by using a pantograph. On the other hand, ferries can include, sometimes free, charging points for the passengers' transported electric bicycle, electric motorcycles and electric cars. Diesel–electric hybrid: There is a third potential use for a diesel auxiliary and that is to charge the batteries, when they suddenly start to wane far from shore in the middle of the night, or at anchor after some days of living aboard. In this case, where this kind of use is to be expected, perhaps on a larger cruising yacht, then a combined diesel–electric solution may be designed from the start. The diesel engine is installed with the prime purpose of charging the battery banks, and the electric motor with that of propulsion. There is some reduction in efficiency if motoring for long distances as the diesel's power is converted first to electricity and then to motion, but there is a balancing saving every time the wind-, sail- and solar-charged batteries are used for manoeuvring and for short journeys without starting the diesel. There is the flexibility of being able to start the diesel as a pure generator whenever required. The main losses are in weight and installation cost, but on the bigger cruising boats that may sit at anchor running large diesels for hours every day, these are not too big an issue, compared to the savings that can be made at other times. An example is the fishing boat Selfa El-Max 1099, with 135 kWh battery and 80 kW diesel generator. An LNG-powered supply vessel started operation in 2016 with a 653 kWh/1600 kW battery acting as spinning reserve during dynamic positioning, saving 15-30% fuel. Solar powered: A