The waterfalls at wastewater treatment plants and industrial facilities that are used to release heat and chemicals from water are now deemed the most promising initial market for renewable energy from turbines made by Hydrovolts, a renewable energy company started in 2007. The $75,000, 15-kilowatt turbine is "easy to permit and install," requires little modification at the plant and could offer a payback of between three and five years from the energy it produces.

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