Wisconsin emergency management workers are involved in a statewide exercise so they will be able to respond in the event of a massive power outage.  The Dark Sky training exercise started yesterday.  The Wisconsin National Guard is training with local emergency management teams to be ready if cyber-attackers manage to shut down the power grid.  Participants are working on strategies to distribute food while the electricity is off, keeping hospitals and other critical infrastructures operating, and maintaining fuel supplies.  The exercise wraps up Thursday.