Kip;
Have you considered a floating weight that you let the tidal rise lift a a pontoon or something, then use that weight to drive a generator / alternator?
similar to how some docks ride up and down on poles with rings around them to keep it in place over various water levels?
Could even "disguise" it as a common dock? Might be less hassle to do as you only use power of the elevating water not flow. Seems you could extract energy both rising and falling and 2X every day?
Just an idea I didn't follow thru on too far as to "how".
Should be easy to calculate the amount of energy in X pounds lowering Y feet in Z time, too.
Tom
"Education consists mainly of what we have unlearned."--Mark Twain
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