Can tidal energy cause a flood?

Answer 1

There is a fundamental difference between tides and tidal energy. Tides are the rising and lowering of sea level and this is probably what you are referring to. Yes, it is possible for the rising water to cause floods in lower lying lands. One good example would be the Netherlands aka Holland. Their land level is below/slightly above sea level, so any rise in sea level threatens their livelihood. That is why they have dykes that prevent sea water from entering the land.

Tidal energy on the other hand utilises the rising and lowering of water level to run turbines and generators to produce electrical energy.

Answer 2

Tidal energy itself does not cause floods. Tidal energy is derived from the movement of tides in the ocean, which, in turn, are influenced by the gravitational pull of the moon and the sun. However, improper management of tidal energy projects could potentially impact coastal areas and lead to flooding if not properly planned and controlled.