Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Activities:
Net income	$ 3,830	$ 3,794
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	4,425	3,916
Deferred income taxes	355	607
Other, net	(22)	(121)
Changes in certain current assets and liabilities —
Receivables	200	(233)
Other current assets	(187)	(181)
Accounts payable	(747)	(161)
Accrued taxes	432	179
Other current liabilities	(267)	(43)
Net cash provided from operating activities	7,205	7,615
Investing Activities:
Property additions	(8,452)	(6,206)
Other investing activities	(103)	(279)
Net cash used for investing activities	(9,599)	(6,678)
Financing Activities:
Increase (decrease) in notes payable, net	(993)	(1,264)
Distributions to noncontrolling interests	(118)	(108)
Payment of common stock dividends	(2,254)	(2,220)
Other financing activities	(176)	(157)
Net cash provided from (used for) financing activities	4,635	(803)
Net Change in Cash, Cash Equivalents, and Restricted Cash	2,241	134
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,101	921
Cash, Cash Equivalents, and Restricted Cash at End of Period	3,342	1,055
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	2,173	2,015
Income taxes, net (excludes credit transfers)	231	131
Noncash transactions —
Accrued property additions at end of period	1,177	937
Right-of-use assets obtained under operating leases	131	126
Reassessment of right-of-use assets under operating leases	0	(7)
SOUTHERN POWER CO
Operating Activities:
Net income	46	191
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	593	388
Deferred income taxes	(122)	68
Amortization of ITCs	(44)	(44)
Other, net	16	13
Changes in certain current assets and liabilities —
Receivables	19	(24)
Other current assets	3	(9)
Accounts payable	(25)	(19)
Accrued taxes	52	56
Other current liabilities	(17)	(13)
Net cash provided from operating activities	521	607
Investing Activities:
Property additions	(620)	(179)
Change in construction payables	78	1
Payments pursuant to LTSAs	(42)	(34)
Other investing activities	0	13
Net cash used for investing activities	(584)	(199)
Financing Activities:
Increase (decrease) in notes payable, net	2
Increase (decrease) in notes payable, net		(68)
Proceeds — Senior notes	1,100	0
Capital contributions from parent company	157	8
Capital contributions from noncontrolling interests	23	11
Distributions to noncontrolling interests	(118)	(108)
Payment of common stock dividends	(209)	(196)
Other financing activities	(13)	(4)
Net cash provided from (used for) financing activities	942	(357)
Net Change in Cash, Cash Equivalents, and Restricted Cash	879	51
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	168	144
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,047	195
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	77	88
Income taxes, net (excludes credit transfers)	163	(30)
Noncash transactions —
Accrued property additions at end of period	138	52
Right-of-use assets obtained under operating leases	2	10
Reassessment of right-of-use assets under operating leases	$ 0	$ (7)