America's first ever commercial scale tidal generator launching in Maine

[Xithras]

14. It sort of does, and it will absolutely kill larger sea life.

There's no point in sugarcoating it. There are videos of their system up on Youtube (skip to the 55 second mark):

These videos show how fast this things spins. Small fish aren't going to have any problem, but any sea life of any real size that wanders into this thing is going to get chummed. Nothing longer than a foot could survive it.

It's really the same issue as windmills. They unquestionably cause severe harm to the environment and wildlife in their immediate vicinity, but the real question is whether their benefits outweigh that cost and harm. EVERY form of power generation is going to do harm, so the question shouldn't be whether it harms wildlife, but whether it harms wildlife LESS than the other forms of power generation we're already using.