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. It will help fuel a $200 million power plant due to begin full-scale production next month. The 55-megawatt Fibrominn LLC plant will be the first poultry litter-fired power plant in the United States, tapping a novel source of renewable...