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Off Grid Energy Independence
Posted on January 12, 2015 by  &  with 1 Comment

Electricity from water pipes

Rentricity Inc. is a renewable energy company based in New York City that designs and installs a unique energy recovery system called Flow-to-Wire™. The system harnesses excess pressure within water mains and uses it to generate clean electric power. A single Flow-to-Wire™ system produces between 30 and 350 kW of clean, renewable, electricity that can then be sold back to the grid.
Rentricity is also developing a suite of Sustainable Energy & Monitoring Systems (SEMS). SEMS™ are a set of pre-packaged, pre-engineered, skid mounted energy recovery systems that will extend the Flow-to-Wire line to the 5-30 kW range. The new SEMS™ product line will be "plug and play", and equipped with an integrated set of water quality sensors. SEMS™ will use a portion of its generated clean power to operate its integrated sensors, creating a self-powered water monitoring station.
Rentricity systems have no adverse environmental impact and are pioneering a new class of clean, renewable hydrokinetic energy. Rentricity focuses on an innovative application of in-pipe hydrokinetic power generation. Water continuously flows through pipelines and offers the capability to generate electricity year-round, 24 hours per day. Over-pressurization occurs where water is stored at significantly higher elevation than the customers it serves, and must therefore flow downhill to reach them. Drinking water processors and industrial manufacturers typically install pressure reduction valves (PRVs) - hydraulic devices that maintain pre-set pressure ranges - to relieve the excess pressure. PRVs generally do not perform useful work with the dissipated pressure, and simply release it as waste heat. Rentricity's innovative energy recovery systems convert this excess pressure into clean electricity.
Rentricity has recently installed a system in North Wales and is gaining power from the water that runs below the streets of Lower Gwynedd. The project is expected to regularly generate between 10 and 13 kilowatts of power, and should pay for itself within five years.
Source and top image: Rentricity
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