What blackout are you talking about in Atlanta? I'm from Atlanta and the only one that comes to mind is in 2017 the airport lost power due to an underground fire. But that was specifically the wiring of the airport and not due to utility negligence
When I lived downtown, we regularly had power outages despite being able to see both Georgia Power hq and Southern Company hq from our roof. It wasn't just us. The World of Coca-Cola, the Center for Civil Rights, and the surrounding buildings frequently lost power. Only the Georgia Aquarium and the Inforum/ACA were spared due to their highly redundant backup power generators. I had less power outages in rural Alabama than I did in downtown Atlanta. For whatever reason the power grid was very fragile in that part of town. I've been told it's because Georgia Power didn't actually build a grid but used a cheaper hub and spoke trunk system. No idea if that's correct but it was shameful how poor their service was in the shadow of their headquarters (and the shadow of their parent company).