BENSON, Minn. AP – The gray, sandy mix of turkey droppings and other bits and pieces flowing through Greg Langmo’s fingers back onto the floor of his barn isn’t just funky dirt, it’s fuel.

With 16,000 hens gobbling around him, Langmo is standing on a 15-inch layer of turkey litter – some 750 tons of the stuff – that represents a new source of energy.