CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash Flows From Operating Activities
Net income	$ 908,879	$ 767,338
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	496,522	445,063
Deferred income taxes	138,658	75,407
Other	(39,418)	(38,360)
Net assets / liabilities from risk management activities	2,292	(1,545)
Net change in Winter Storm Uri current regulatory asset	0	2,021,889
Net change in other operating assets and liabilities	(103,869)	(48,284)
Net cash provided by operating activities	1,403,064	3,221,508
Cash Flows From Investing Activities
Capital expenditures	(2,129,137)	(2,083,486)
Debt and equity securities activities, net	(1,701)	(7,302)
Other, net	11,744	13,469
Net cash used in investing activities	(2,119,094)	(2,077,319)
Cash Flows From Financing Activities
Net decrease in short-term debt	(241,933)	(184,967)
Net proceeds from equity issuances	749,987	671,630
Issuance of common stock through stock purchase and employee retirement plans	11,390	11,660
Proceeds from issuance of long-term debt	1,240,204	797,258
Proceeds from issuance of securitized long-term debt by AEK	0	95,000
Proceeds from term loan	0	2,020,000
Repayment of term loan	0	(2,020,000)
Repayment of long-term debt	0	(2,200,000)
Repayment of securitized long-term debt by AEK	(5,738)	0
Cash dividends paid	(366,719)	(319,074)
Debt issuance costs	(11,147)	(7,864)
Securitized debt issuance costs	0	(1,273)
Net cash provided by (used in) financing activities	1,376,044	(1,137,630)
Net increase in cash and cash equivalents and restricted cash and cash equivalents	660,014	6,559
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	19,248	51,554
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 679,262	$ 58,113