Local law enforcement, emergency management, the National Guard and Alliant Energy are practicing how they would react if there was a long-term mass power outage in Wisconsin. The Dark Sky exercise runs through tomorrow in seven Wisconsin counties. In Fond du Lac Alliant Energy’s Steve Weston says the exercise tests the abilities of Alliant, law enforcement, first responders and the National Guard to respond to the scenario as well as its second and third order effects. “Its never happened before. The big thing that concerns me from an Alliant standpoint is when a tornado comes through we’ll go out and start restoration efforts. Here, its a different game,” Weston told WFDL news. The goal is to increase understanding of the coordination, policies, and procedures required to conduct a joint inter-agency response to cyber and physical threats to critical infrastructure in Wisconsin. More than 1,000 participants from the state Emergency Operations Center, the Business Emergency Operations Center, the Wisconsin National Guard, county emergency operations centers, municipal command posts, the American Red Cross, and federal agencies are participating in the exercise.