The Southern Company (SO -0.46%) is one the largest regulated utilities in the United States. It has an enviable track record when it comes to rewarding investors, noting the 22 consecutive years of annual dividend increases it has under its belt. But for the last decade the business has been overshadowed by a massive capital investment project. The next three years should be very different.Southern is almost done with VogtleThe biggest news in 2023 for Southern was that it brought Vogtle Unit 3 online. Thi ...