- Alabama Power Company
Direct subsidiaryUnited States
- CENTRAL VALLEY GAS STORAGE, L.L.C.
Held through a subsidiaryUnited States
- ENERGY RESOURCE INSURANCE CORPORATION
Held through a subsidiaryUnited States
- GEORGIA POWER COMPANY
Direct subsidiaryUnited States
- GLASS SANDS WIND ENERGY, LLC
Held through a subsidiaryUnited States
- GOLDEN TRIANGLE STORAGE, LLC
Held through a subsidiaryUnited States
- GRANT PLAINS WIND, LLC
Held through a subsidiaryUnited States
- ILLINOIS ENERGY SOLUTIONS, USA, LLC
Held through a subsidiaryUnited States
- ILLINOIS ENERGY, USA, LLC
Held through a subsidiaryUnited States
- JEFFERSON ISLAND STORAGE & HUB L.L.C.
Held through a subsidiaryUnited States
- MILLERS BRANCH SOLAR, LLC
Held through a subsidiaryUnited States
- MISSISSIPPI POWER COMPANY
Direct subsidiaryUnited States
- NICOR ENERCHANGE, L.L.C.
Held through a subsidiaryUnited States
- NORTHERN ILLINOIS GAS COMPANY
Held through a subsidiaryUnited States
- PASSADUMKEAG WINDPARK, LLC
Held through a subsidiaryUnited States
- READING WIND ENERGY, LLC
Held through a subsidiaryUnited States
- SALT FORK WIND, LLC
Held through a subsidiaryUnited States
- Southern Company Gas
Direct subsidiaryUnited States
- SOUTHERN COMPANY GAS CAPITAL CORPORATION
Held through a subsidiaryUnited States
- Southern Electric Generating Company
Direct subsidiaryUnited States
- SOUTHERN POWER COMPANY
Direct subsidiaryUnited States
- SOUTHSTAR ENERGY SERVICES LLC
Held through a subsidiaryUnited States
- SP ENERGY TRADING, LLC
Held through a subsidiaryUnited States
- TYLER BLUFF WIND PROJECT, LLC
Held through a subsidiaryUnited States
- VIRGINIA NATURAL GAS, INC.
Held through a subsidiaryUnited States
- WAKE WIND ENERGY LLC
Held through a subsidiaryUnited States
