First off they are not generator pumps they are hydroelectric generators at the surface where the Gulfstream current flows to the north past them at 6 to 7 mph thus turning the impellars and generating the power.
I calculate each tunnel will move 330,000,000 cubic feet of water per hour through them and exiting the tunnel at 5 mph. This should be enough water to generate near 50 megawatts of power per tunnel. With 1500 tunnels that is a staggering 75,000 mega watts of pure clean energy and would curb greenhouse gasses to some extent.
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