These Sialia yachts, like the all-electric 57 Deep Silence, offer a one mega-watt-hour (MWh) battery capacity and 400 kW motors capable of transporting a dozen passengers long distances.

The boat has a larger-than-normal foresail to better capture the wind's power. Two silent, vibration-free electric motors and a 100-kilowatt-hour battery storage system bolster that. Those can be ...