The Atlanta-based utility holding company reported earnings of 44 cents per share, which beat analysts' expectations by one cent.
Revenue for the quarter was $3.6 billion, missing analysts' estimates of $4.47 billion.
"2015 was a tremendous year for Southern Company," CEO Thomas Fanning said in a statement this morning. "We saw strong financial performance both from our wholesale subsidiary, Southern Power, and our traditional operating companies."
Earnings were partially offset by higher depreciation and warmer weather during the fourth quarter, the company noted.
The energy company serves more than 4.5 million customers in the southeastern U.S. through its subsidiaries.
Additionally, oil prices are rallying on Wednesday morning after Russia reiterated its willingness to discuss reducing production with OPEC, Reuters reports.
Separately, TheStreet Ratings Team has a "buy" rating with a score of A- on the stock.
This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that the team rates.
The company's strengths can be seen in multiple areas, such as its revenue growth, growth in earnings per share, increase in net income, expanding profit margins and good cash flow from operations.
The team believes its strengths outweigh the fact that the company has had generally high debt management risk by most measures that were evaluated.
Recently, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.