For folks with a large stream on their property, a Pelton Wheel system like this is fantastic: Algonquin Eco-Lodge – 12 kW Micro-Hydro Turbines [1]
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.50 BMG shooters might find this reference page [3] on specialty military rounds of interest.
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Mike Brown [4] is planning to build a new generation of reliable 8 horsepower steam engines that will be able to run a 5 kilowatt generator.