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> the tide doesn't always flow when you want it to

So what? You can store tidal water and let the store always flow.

Flow to where?

Low tide only occurs twice a day.

Other pools, which you then empty on low-tide. That way you can start draining your main pool as soon as high-tide is reached - you don't need to wait for low-tide. With a set of pools you can keep draining 24 hours a day.

Schemes such as this have been proposed, see the Swansea Tidal Lagoon [0]. The bottom line is that they are crazy expensive for the power they deliver and just don't compete against other renewables.

[0]https://en.wikipedia.org/wiki/Tidal_Lagoon_Swansea_Bay

> Schemes such as this have been proposed

Lol well if you knew that then why did you ask me to explain it?

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