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I have seen designs where moving tidal water compresses and pushes air inside a concrete structure to move air turbines. Any idea about those projects?

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An air driven Wells turbine? As with other wave/tidal schemes, they are not viable at scale.

Consider the flagship 'LIMPET' project: https://en.wikipedia.org/wiki/Islay_LIMPET

Blimey, I remember seeing that covered on Tomorrow's World when it was being built. It seemed like an interesting idea at the time.

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