An individual opened fire near a Duke Energy facility at Wateree Hydro Station in Ridgeway, South Carolina, on Wednesday, CBS News has learned."The Department of Energy takes the security of our nation's power grid seriously and we work closely with industry to identify and address the evolving threats to the grid," Energy Secretary Jennifer Granholm said in a statement to CBS News.In January, a bulletin from the Department of Homeland Security, obtained by CBS News, warned that domestic violent extremists "have developed credible, specific plans to attack electricity infrastructure since at least 2020, identifying the electric grid as a particularly attractive target.""We are working with energy companies in local communities to address the situation impacting the power that reaches homes in the targeted neighborhoods," DHS Secretary Mayorkas said during an event in Washington, D.C. "The question is, is it an act of malfeasance or otherwise?The FBI continues to seek information about the person or persons who it said vandalized two Moore County electrical substations, turning off the lights for 45,000."