By Sara StrongWith seven more wind turbines going up in Rock County this fall, the process of harnessing the natural resource for energy is a topic of interest.Just how towers are constructed and operated is also considered important to emergency personnel in the county.MinnWind, the local group which owns the towers, gave a tour Tuesday to law enforcement, fire department and emergency medical personnel.Mark Willers, MinnWind president, explained how the towers were constructed and reminded the group of interesting facts about the towers.oThe towers have a 35-foot deep foundation. They consist of a large culvert around the outer ring, and a smaller culvert on the inside. In between is cement, reinforced by bolts and vertical and horizontal rods every two feet.oThe current four towers produce .95 megawatts of electricity. The new project will have towers that produce 1.65 megawatts of electricity due to increased efficiency.oThe current blades are 54 meters long. The new towers will have blades 84 meters long. Other MinnWind president Tom Arends said, "These have become a real community project and people are so interested in it. It is a part of the community rather than an individual profiting from it."We have to put up with the wind, and the beauty of it is, we can sell it now."