ATLANTA, July 17, 2013 /PRNewswire/ -- Southern Company Chief Operating Officer Mark A. Crosswhite has announced several changes within the company's operations management team. (Logo: http://photos.prnewswire.com/prnh/20080801/SOCOLOGO ) William C. Grantham will become vice president, chief financial officer and treasurer for subsidiary Southern Power. He will assume a role vacated by Michael W. Southern, who has announced his plans to retire. The change will take place on Sept. 1. John G. Trawick will return to Southern Company from the Tennessee Valley Authority (TVA), succeeding Grantham in the newly expanded role of vice president of commercial operations and services, effective Aug. 1. In his new role, the company's fleet operations and trading functions will report directly to Trawick, a role currently held by Charles D. Long, who has announced plans to retire. Trawick most recently served as TVA's senior vice president of power supply and fuels. In addition, Crosswhite announced that Kimberly D. Flowers will become vice president of engineering for engineering and construction services. Lewis A. Jeffers will succeed Flowers as vice president of technical services for engineering and construction services. "These individuals exemplify the Southern Company system's diversity of experience and demonstrate the exceptional leadership needed for the company to remain among the best in our industry while providing our customers with clean, safe, reliable and affordable power," said Crosswhite. "These moves will enhance our ability to deliver on our major projects and support the fleet with industry-leading technical expertise." Michael W. Southern joined Southern Company in 1974 as an accounting associate with subsidiary Georgia Power. After progressing through various roles, he held leadership positions across multiple operating companies, including assistant treasurer for Georgia Power, director of financial planning and director of corporate finance for Southern Company, and chief financial officer of subsidiary Mississippi Power. He is past chairman of the Finance and Regulation Executive Advisory Committee and the Finance Committee for the Edison Electric Institute. Long began his Southern Company career in 1974 as a junior engineer at subsidiary Alabama Power's Plant Barry. He subsequently held management positions in bulk power services and contracts, integrated resource planning and system planning for Southern Company Services. In 1998, Long became vice president of generation planning and development and was named vice president of fleet operations and trading in 2005. Since that time, he has led the real-time operation and energy trading activities of the Southern Company fleet.