EX-21.A 4 x21a-q42023xsubsidiariesof.htm EX-21.A
Exhibit 21(a)
Subsidiaries of the Registrant(1)

Name of Company |  | Jurisdiction of Organization
The Southern Company |  | Delaware
Alabama Power Company |  | Alabama
Alabama Property Company |  | Alabama
Southern Electric Generating Company |  | Alabama
Georgia Power Company |  | Georgia
Piedmont-Forrest Corporation |  | Georgia
Southern Electric Generating Company |  | Alabama
Mississippi Power Company |  | Mississippi
Southern Power Company |  | Delaware
SP Deuel Harvest Wind Energy Class B Holdings, LLC |  | Delaware
SP Deuel Harvest Wind Energy Holdings, LLC (2) |  | Delaware
Deuel Harvest Wind Energy Holdings, LLC (3) |  | Delaware
Deuel Harvest Wind Energy, LLC |  | Delaware
SP Diamond State Class B Holdings, LLC |  | Delaware
Diamond State Generation Partners, LLC (4) |  | Delaware
Beech Ridge Energy II Holdings, LLC (5) |  | Delaware
Beech Ridge Energy II, LLC |  | Delaware
SP Skookumchuck Investments, LLC (6) |  | Delaware
SP Skookumchuck Holdings, LLC (7) |  | Delaware
SP Skookumchuck Wind Energy Project, LLC |  | Delaware
Reading Wind Energy Class B Holdings, LLC |  | Delaware
Reading Wind Energy Holding, LLC (8) |  | Delaware
Reading Wind Energy, LLC |  | Delaware
SP Roserock Investment, Inc. |  | Delaware
RE Roserock Holdings, LLC (9) |  | Delaware
RE Roserock LLC |  | Delaware
Southern Renewable Energy, Inc. |  | Delaware
Glass Sands Wind Energy, LLC |  | Delaware
SP Wildhorse Class B Holdings, LLC |  | Delaware
SP Wildhorse Holdings, LLC (10) |  | Delaware
Wildhorse Wind Energy, LLC |  | Delaware
SP Solar GP, Inc. |  | Delaware
SP Solar Holdings I, LP (11) |  | Delaware
SP Solar Storage Class B Holdings, LLC (12) |  | Delaware
SP Solar Storage OpCo, LLC (13) |  | Delaware
SP Garland Solar Storage, LLC |  | Delaware
SP Tranquillity Solar Storage, LLC |  | Delaware
BNB Lamesa Solar, LLC |  | Delaware
East Pecos Solar, LLC |  | Delaware
SP Butler Solar, LLC |  | Delaware
SP Butler Solar Farm, LLC |  | Delaware

SP Decatur County Solar, LLC |  | Delaware
SP Decatur Parkway Solar, LLC |  | Delaware
SP Pawpaw Solar, LLC |  | Delaware
SP Sandhills Solar, LLC |  | Delaware
SP Solar Farms, LLC |  | Delaware
Adobe Solar, LLC |  | Delaware
Apex Nevada Solar, LLC |  | Delaware
Calipatria, LLC |  | Delaware
Campo Verde Solar, LLC |  | Delaware
Granville Solar, LLC |  | Delaware
Macho Springs Solar, LLC |  | Delaware
Macho Springs Solar 2, LLC |  | Delaware
Morelos Solar, LLC |  | Delaware
Rutherford Farm, LLC |  | Delaware
Spectrum Nevada Solar, LLC |  | Delaware
SP Cimarron I, LLC |  | Delaware
SP Cimarron Capital, LLC |  | Delaware
Southern Renewable Partnerships, LLC |  | Delaware
BSP Holding Company, LLC (14) |  | Delaware
Boulder Solar Power Parent, LLC |  | Delaware
Boulder Solar Power, LLC |  | Delaware
Desert Stateline Holdings, LLC (15) |  | Delaware
Desert Stateline, LLC |  | Delaware
Lost Hills Blackwell Holdings, LLC (14) |  | Delaware
Lost Hills Solar Holdco, LLC |  | Delaware
Lost Hills Solar, LLC |  | Delaware
Blackwell Solar Holdings, LLC |  | Delaware
Blackwell Solar, LLC |  | Delaware
NS Solar Holdings, LLC (14) |  | Delaware
North Star Solar, LLC |  | Delaware
Parrey Holding Company, LLC (14) |  | Delaware
Parrey Parent, LLC |  | Delaware
Parrey, LLC |  | Delaware
RE Silverlake Holdings, LLC (14) |  | Delaware
RE Garland Holdings LLC |  | Delaware
RE Garland, LLC |  | Delaware
RE Garland A, LLC |  | Delaware
RE Tranquillity Holdings, LLC (14) |  | Delaware
RE Tranquillity, LLC |  | Delaware
RE Tranquillity BAAH, LLC |  | Delaware
SG2 Holdings, LLC (14) |  | Delaware
SG2 Imperial Valley LLC |  | Delaware
SP Wind Holdings II, LLC (16) |  | Delaware
Bethel Wind Farm Class B Holdings, LLC |  | Delaware
Bethel Wind Farm Holdings, LLC |  | Delaware

Bethel Wind Farm, LLC |  | Delaware
Grant Plains Wind, LLC |  | Delaware
Grant Wind, LLC |  | Delaware
Grant County Interconnect, LLC (17) |  | Delaware
Kay Wind, LLC |  | Delaware
Passadumkeag Windpark, LLC |  | Delaware
Salt Fork Wind, LLC |  | Delaware
Tyler Bluff Wind Project, LLC |  | Delaware
WWH LLC (18) |  | Delaware
Wake Wind Class B Holdings LLC |  | Delaware
Wake Wind Holdings, LLC |  | Delaware
Wake Wind Energy, LLC |  | Delaware
SP TEP Class B Holdings I, Inc. |  | Delaware
SP Gaskell West 1 Class B Holdings, LLC |  | Delaware
SP Gaskell West 1 Holdings, LLC (19) |  | Delaware
RE Gaskell West 1, LLC |  | Delaware
SP Wind Development Holdings, LLC |  | Delaware
SP TEP Formations, Inc. |  | Delaware
SP Cactus Flats Class B Holdings, LLC |  | Delaware
Cactus Flats Holdings, LLC (20) |  | Delaware
SP Cactus Flats Wind Energy, LLC |  | Delaware
Millers Branch Solar, LLC |  | Delaware
South Cheyenne Solar, LLC |  | Delaware
Southern Company Gas |  | Georgia
Southern Company Gas Capital Corporation |  | Nevada
Atlanta Gas Light Company |  | Georgia
Georgia Natural Gas Company |  | Georgia
SouthStar Energy Services LLC |  | Delaware
Ottawa Acquisition LLC |  | Illinois
Northern Illinois Gas Company (21) |  | Illinois
Southern Company Gas Investments, Inc. |  | Georgia
Southern Company Gas Pipeline Holdings LLC |  | Georgia
Evergreen Enterprise Holdings LLC |  | Georgia
Virginia Natural Gas, Inc. |  | Georgia

(1)This information is as of December 31, 2023. In addition, this list omits certain subsidiaries pursuant to paragraph (b)(21)(ii) of Regulation S-K, Item 601.
(2)SP Deuel Harvest Wind Energy Class B Holdings, LLC and Southern Renewable Energy, Inc. own 99% and 1% of the Class B membership interests, respectively, in the tax equity partnership.
(3)SP Deuel Harvest Wind Energy Holdings, LLC owns 80%.
(4)SP Diamond State Class B Holdings, LLC owns 100% of the Class B membership interests.
(5)Southern Power Company owns 100% of the Class A membership interests and is entitled to 90% of all cash distributions.
(6)Southern Power Company owns 51%.
(7)SP Skookumchuck Investment, LLC owns 100% of the Class B membership interests in the tax equity partnership.
(8)Reading Wind Energy Class B Holdings, LLC owns 100% of the Class B membership interests in the tax equity partnership.
(9)Southern Power Company owns 100% of the Class A membership interests and is entitled to 51% of all cash distributions and SP Roserock Investment Inc. owns 100% of the Class B membership interests and is entitled to 49% of all cash distributions
(10)SP Wildhorse Class B Holdings, LLC owns 100% of the Class B membership interests in the tax equity partnership.
(11)Southern Renewable Energy, Inc. and SP Solar GP, Inc. own 66% and 1%, respectively.
(12)SP Solar Holdings I, LP and SP Solar GP, Inc. own 98% and 2% of the Class A membership interests, respectively, as well as 50% and 1% of the entirety of the entities through their Class A membership interests, respectively.
(13)SP Solar Storage Class B Holdings, LLC owns 100% of the Class B membership interests in the tax equity partnership.
(14)Southern Renewable Partnerships, LLC owns 100% of the Class A membership interests and is entitled to 51% of all cash distributions.
(15)Southern Renewable Partnerships, LLC owns 100% of the Class A membership interests and is entitled to 66% of all cash distributions.
(16)Southern Renewable Energy, Inc. owns 100% of the Class B membership interests in the tax equity partnership.
(17)Grant Wind, LLC and Grant Plains Wind, LLC own 50.4% and 49.6%, respectively.
(18)SP Wind Holdings II, LLC owns 90.1%.
(19)SP Gaskell West 1 Class B Holdings, LLC owns 100% of the Class B membership interests in the tax equity partnership.
(20)SP Cactus Flats Class B Holdings, LLC and SP TEP Class B Holdings I, Inc. own 95% and 5%, respectively, of the Class B membership interests in the tax equity partnership.
(21)Doing business as Nicor Gas Company.