Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Activities:
Net income	$ 1,338	$ 1,270
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,580	1,411
Deferred income taxes	168	351
Other, net	(25)	(1)
Changes in certain current assets and liabilities —
Receivables	124	7
Other current assets	(27)	66
Accounts payable	(555)	(394)
Accrued compensation	(599)	(537)
Other current liabilities	(4)	(37)
Net cash provided from operating activities	1,226	1,250
Investing Activities:
Property additions	(2,944)	(2,437)
Other investing activities	(60)	(68)
Net cash used for investing activities	(3,421)	(2,834)
Financing Activities:
Increase (decrease) in notes payable, net	653
Increase in notes payable, net		(841)
Distributions to noncontrolling interests	(47)	(37)
Payment of common stock dividends	(776)	(736)
Other financing activities	(191)	(133)
Net cash provided from financing activities	1,542	2,815
Net Change in Cash, Cash Equivalents, and Restricted Cash	(653)	1,231
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,640	1,101
Cash, Cash Equivalents, and Restricted Cash at End of Period	987	2,332
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	901	756
Income taxes, net (excludes credit transfers)	0	(1)
Noncash transactions —
Accrued property additions at end of period	1,049	940
Right-of-use assets obtained under operating leases	41	87
SOUTHERN POWER CO
Operating Activities:
Net income	(14)	23
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	283	158
Deferred income taxes	(27)	5
Amortization of ITCs	(15)	(15)
Loss on damaged equipment	20	0
Other, net	0	1
Changes in certain current assets and liabilities —
Receivables	23	(5)
Income taxes receivable	(43)	(6)
Other current assets	14	5
Accounts payable	(46)	(27)
Accrued compensation	(15)	(15)
Other current liabilities	13	22
Net cash provided from operating activities	193	146
Investing Activities:
Property additions	(119)	(187)
Change in construction payables	2	39
Payments pursuant to LTSAs	(14)	(13)
Other investing activities	2	0
Net cash used for investing activities	(129)	(161)
Financing Activities:
Increase (decrease) in notes payable, net	23
Increase in notes payable, net		0
Capital contributions from parent company	0	130
Capital contributions from noncontrolling interests	4	19
Distributions to noncontrolling interests	(47)	(37)
Payment of common stock dividends	(72)	(70)
Other financing activities	(5)	(3)
Net cash provided from financing activities	(97)	39
Net Change in Cash, Cash Equivalents, and Restricted Cash	(33)	24
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	105	168
Cash, Cash Equivalents, and Restricted Cash at End of Period	72	192
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	13	22
Income taxes, net (excludes credit transfers)	1	0
Noncash transactions —
Accrued property additions at end of period	55	99
Right-of-use assets obtained under operating leases	$ 0	$ 2