October 27, 2011 7:14 AM

Alternative energy: 9,000 pigs plus a high-tech waste digester equals methane

The old saw about using every part of a pig but the squeal now includes its droppings, which are producing electricity on a Yadkin County, N.C., farm. Duke University is a partner with Duke Energy and Google in testing a system that captures methane, a potent greenhouse gas, from manure. The gas fuels a small power plant that makes enough energy to run the waste-processing system and part of the farm itself.

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