Wow, as someone who isn't around water very much I'm shocked to hear that those types of vessels are fully electric today. What's charging like?

I think pure electric is most common for sailboats. Where can get most of your propulsion from the wind and power from solar. My understanding is that range on electric is small. Fine for harbors but not enough if wind is wrong. It is usually possible to drift but that wastes time and can be problem in some situations. Most electric drive sailboats have a diesel generator as backup.

Power is common on a lot of docks. Just plug it in and charge it up.

Range is not really a problem if you plan carefully and are patient. I try not to motor much anyway -- it being a sailboat and all. I do have a back up generator though.

At any commercial yacht marina, the wharf will almost look like a Tesla parking lot, with rows of chargers. There's a plug for every berth.

If you do an image search for "marina" you can even spot them on most stock photos.

My cat has a lot of real estate so I put a lot of solar. I rarely motor and mostly sail, but when I have extra power because the battery is full and the sun is shining, I can get a small speed boost for free. I have plenty of excess energy and have plugged into shore power maybe twice in the last year.

Many folks have a generator in case they need more range and there isn't enough wind. But I personally haven't needed it yet, but I also don't sail long distances. I would probably bring a generator if I did, in case there's no wind and I need to move.

My friend has a generator aboard but hasn't used it once yet, and he made it to Puerto Vallarta from SF.

Electric drive requires an enormous multi-ton battery i.e. a bomb. It's a reasonable concern.

People always say this, but a big tank of fossil fuels is a bomb too! We have managed just fine with them.

A gas tank, a propane tank, heck even a diesel tank, are all more dangerous than my LFP pack. Also my LFP pack weights 81kg, not a ton, definitely not multiple tons.