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Power Science

Harvesting Power When Freshwater Meets Salty 151

Posted by samzenpus
from the power-up dept.
ckwu writes "As a way to generate renewable electricity, researchers have designed methods that harvest the energy released when fresh and saline water mix, such as when a river meets the sea. One such method is called pressure-retarded osmosis, where two streams of water, one saline and one fresh, meet in a cell divided by a semipermeable membrane. Osmosis drives the freshwater across the membrane to the saltier side, increasing the pressure in the saline solution. The system keeps this salty water pressurized and then releases the pressure to spin a turbine to generate electricity. Now a team at Yale University has created a prototype device that increases the power output of pressure-retarded osmosis by an order of magnitude. At a full-scale facility, the estimated cost of the electricity generated by such a system could be 20 to 30 cents per kWh, approaching the cost of other conventional renewable energy technologies."
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Harvesting Power When Freshwater Meets Salty

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  • by kartaron (763480) on Monday December 02, 2013 @08:31PM (#45579931)
    If you actually read the first article it states the primary source of 'subsidy' is tax credits and limits on taxation for certain circumstances. From a 60 year total of around 800 billion, 47% is for direct tax benefits., 20% is for perceived imbalanced price controls and the costs of government oversight (ie the Nuclear regulating agency: NRC), 10% is (mostly to hydroelectric plants) for construction of Dams, access to shipping ports and operations of the Dept of Interior. Which leaves grants for operations of shipping, 6 billion, and R&D expenditures, 153 billion. Thats about 3 billion a year on average of actual subsidy. That is well in line with US government subsidy of other industries... like the 3 billion insurance program for small business loans, or 3 billion for 'improving teachers', or 4 billion for insurance against milk profit margins for farmers. etc, etc []

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