(NewsNation) — A series of vandalism reports throughout the country — including a pair of outages in North Carolina that left thousands without power for days — points to vulnerabilities in securing some of the nation’s power grids. Following an incident last week that caused widespread power outages in North Carolina, Nexstar’s WNCN visited two substations and found they were secured by only a chain-link fence and a lock. There were no visible security cameras or guards. Law enforcement has recently been called to investigate suspected acts of intentional vandalism in areas including Florida and Washington state. A substation in...