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Casey Collins, Duke University energy manager, inspects a boiler at the West Campus Steam Plant. Soon, these boilers will run on swine biogas instead of natural gas. James Morrison/WUNC hide caption

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James Morrison/WUNC

Reinford Farms has 700 dairy cows. As you can imagine, they produce a lot of ... um... material to be converted into electricity. Dani Fresh for WHYY hide caption

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Dani Fresh for WHYY