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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash Flows From Operating Activities    
Net income $ 1,227,552 $ 1,023,863
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 591,853 549,069
Deferred income taxes 300,650 214,609
Other (50,435) (49,402)
Net assets / liabilities from risk management activities 1,417 (1,966)
Net change in other operating assets and liabilities (399,571) (34,841)
Net cash provided by operating activities 1,671,466 1,701,332
Cash Flows From Investing Activities    
Capital expenditures (3,076,281) (2,597,787)
Debt and equity securities activities, net (6,168) (2,348)
Other, net 6,317 6,469
Net cash used in investing activities (3,076,132) (2,593,666)
Cash Flows From Financing Activities    
Net proceeds from equity issuances 941,694 568,603
Issuance of common stock through stock purchase and employee retirement plans 4,783 11,532
Proceeds from issuance of long-term debt 1,296,231 1,143,447
Repayment of long-term debt (10,000) 0
Repayment of securitized long-term debt by AEK (4,394) (4,051)
Cash dividends paid (490,698) (412,312)
Debt issuance costs (10,944) (10,140)
Net cash provided by financing activities 1,726,672 1,297,079
Net increase in cash and cash equivalents and restricted cash and cash equivalents 322,006 404,745
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period 203,803 308,856
Cash and cash equivalents and restricted cash and cash equivalents at end of period $ 525,809 $ 713,601