[anotheryou]

You can put them in the water with just an anchored buoy.

[NohatCoder]

Then you have to connect them all with sea cables, those add up if you need another km for every base you install.

[anotheryou]

Yes, preferably not too deep water. Still better than trying to keep a windmill-like turbine upright (those exist, but look complicated https://www.sierraclub.org/sites/www.sierraclub.org/files/st... ).

edit: oh you mean for the electricity, yes...