"....down by the river" was an SNL [cultural] reference, but it is a use case for a drop-in hydro generator.
wattpowervolt.com/portable-hydro-turbine-power-generator-300watts-12volts.php
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Portable Hydro Turbine Power Generator 12Volts. Each river has rapid parts with a higher gradient. You can install a Submersible Generator. Without having to build a dam or install piping. Submersible generator is a special. Low-speed, high efficiency output turbine alternator. Hydro turbine can work in rapid. Current without hose or small creeks with hose from 10 degree drop gradient.
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