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Why not add turbines all the way up the stack? At least do so to the point that it does not interfere with the draft. The current design seems like a waste to me.

$750 million seems like a lowball estimate for the cost, and 80 years sounds awfully optimistic for end of life, but it would then come to just over $5 per month per home for electricity, so even if the numbers are off, it still sounds feasible.