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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash Flows From Operating Activities    
Net income $ 984,863 $ 837,434
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 390,332 363,283
Deferred income taxes 228,488 170,965
Other (34,970) (32,691)
Net assets / liabilities from risk management activities 2,837 845
Net change in other operating assets and liabilities (540,003) (134,877)
Net cash provided by operating activities 1,031,547 1,204,959
Cash Flows From Investing Activities    
Capital expenditures (2,036,935) (1,730,857)
Debt and equity securities activities, net (5,319) 710
Other, net 6,488 12,609
Net cash used in investing activities (2,035,766) (1,717,538)
Cash Flows From Financing Activities    
Net proceeds from equity issuances 671,633 379,490
Issuance of common stock through stock purchase and employee retirement plans 3,738 7,888
Proceeds from issuance of long-term debt 596,532 645,372
Repayment of long-term debt (10,000) 0
Repayment of securitized long-term debt by AEK (4,394) (4,051)
Cash dividends paid (324,510) (273,869)
Debt issuance costs (5,475) (5,987)
Net cash provided by financing activities 927,524 748,843
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents (76,695) 236,264
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 $ 127,108 $ 545,120