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Free electricity if you don't mind a huge water bill, I suppose. This would be a great idea if you could get water pressure for free. Any method of converting water pressure to electricity would be great if you didn't have a water bill to worry about.
Do you recycle water and use a compressor to create tank pressure? What kind of energy losses are involved in creating sufficient water jet pressure?
It's been a while since I saw this first elsewhere, so I'm not sure anymore of the details. But I'm pretty sure he has a stream which allows him to do this - so no loss whatsoever, the stream's already there ! This kind of setup is only suitable for someone with terrain anyways. It's noisy, and lots of water to get back to nature. But if you have a free water source available, it'd be a shame not to use that energy laying around, now would it ? :)
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