S&P revises Southern Co. and subsidiaries rating outlook to negative On May 24, Standard & Poor's Ratings Services revised the rating outlook on Southern Co. and its operating subsidiaries to negative from stable. S&P stated, "At the same time, we affirmed the 'A' corporate credit rating on those entities and the 'BBB+' corporate credit rating on Southern Power Co. The rating outlook on Southern Power Co. is stable. The outlook revision on Southern Co. and its operating subsidiaries reflects our assessment of increased business risk as a result of a series of unfavorable regulatory, operational, and risk management developments. Over the past 12 months, adverse regulatory and project developments at Mississippi Power's integrated gasification combined cycle generation facility have contributed to a significant increase to the company's business risk and by association to Southern Co.'s business risk."