A feature is that it puts power near where it may be needed. A feature can be that the best locations are high flow areas where harbors and shipping will be rare. A flaw is that there are not a lot of such places. A flaw is that building in such places will be a fair nightmare - you want to harness the power, but that power is going to be working to wipe out the construction site. And it will hamper maintenance - Hoover Dam just sits there in the air any tidal place will be beaten by water every day.
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