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Details of Selected Financial Statement Captions | 12 Months Ended
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Sep. 30, 2025
Balance Sheet Related Disclosures [Abstract] |
Details of Selected Financial Statement Captions | Details of Selected Financial Statement Captions The following tables provide additional information regarding the composition of certain financial statement captions. Balance Sheet Accounts receivable Accounts receivable was comprised of the following at September 30, 2025 and 2024:
| September 30
| 2025 |  | 2024
| (In thousands)
Billed accounts receivable | $ | 213,651 |  |  | $ | 220,869 |
Unbilled revenue | 140,651 |  |  | 123,550 |
Insurance receivable | 22,940 |  |  | 51,715 |
Other accounts receivable | 43,526 |  |  | 6,804 |
Total accounts receivable | 420,768 |  |  | 402,938 |
Less: allowance for uncollectible accounts | (45,259) |  |  | (37,056) |
Net accounts receivable | $ | 375,509 |  |  | $ | 365,882 |
Other current assets Other current assets as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Deferred gas costs | $ | 140,626 |  |  | $ | 159,762 |
Winter Storm Uri incremental costs | 5,841 |  |  | 3,949 |
Prepaid expenses | 80,495 |  |  | 74,780 |
Taxes receivable | 8,948 |  |  | 14,332 |
Materials and supplies | 20,076 |  |  | 16,961 |
Assets from risk management activities | 5,303 |  |  | 2,091 |
Regulatory assets (See Note 3) | 33,311 |  |  | 12,297 |
Other | 7,027 |  |  | 3,896 |
Total | $ | 301,627 |  |  | $ | 288,068 |
Property, plant and equipment Property, plant and equipment was comprised of the following as of September 30, 2025 and 2024:
| September 30
| 2025 |  | 2024
| (In thousands)
Storage plant | $ | 790,621 |  |  | $ | 708,617 |
Transmission plant | 6,308,557 |  |  | 5,713,831 |
Distribution plant | 19,788,099 |  |  | 17,304,207 |
General plant | 1,102,931 |  |  | 1,019,018 |
Intangible plant | 38,612 |  |  | 38,612 |
| 28,028,820 |  |  | 24,784,285 |
Construction in progress | 1,235,316 |  |  | 1,063,798 |
| 29,264,136 |  |  | 25,848,083 |
Less: accumulated depreciation and amortization | (3,971,146) |  |  | (3,643,716) |
Net property, plant and equipment (1) | $ | 25,292,990 |  |  | $ | 22,204,367 |
(1) Net property, plant and equipment includes plant acquisition adjustments of $(21.1) million and $(22.9) million at September 30, 2025 and 2024. Deferred charges and other assets Deferred charges and other assets as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Marketable securities | $ | 114,938 |  |  | $ | 110,594 |
Regulatory assets (See Note 3) | 428,951 |  |  | 396,958 |
Operating lease right of use assets (See Note 7) | 293,934 |  |  | 249,556 |
Winter Storm Uri incremental costs | — |  |  | 6,424 |
Assets from risk management activities | 4,594 |  |  | 94,197 |
Pension and postretirement assets | 226,409 |  |  | 155,611 |
Other | 28,627 |  |  | 30,343 |
Total | $ | 1,097,453 |  |  | $ | 1,043,683 |
Accounts payable and accrued liabilities Accounts payable and accrued liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Trade accounts payable | $ | 380,999 |  |  | $ | 341,948 |
Accrued gas payable | 37,073 |  |  | 19,125 |
Accrued liabilities | 88,444 |  |  | 84,324 |
Total | $ | 506,516 |  |  | $ | 445,397 |
Other current liabilities Other current liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Customer credit balances and deposits | $ | 56,185 |  |  | $ | 62,085 |
Accrued employee costs | 69,062 |  |  | 64,141 |
Deferred gas costs | 6,879 |  |  | 9,142 |
Operating lease liabilities (See Note 7) | 45,010 |  |  | 34,340 |
Accrued interest | 122,459 |  |  | 106,116 |
Liabilities from risk management activities | 6,339 |  |  | 7,324 |
Taxes payable | 237,965 |  |  | 215,857 |
Pension and postretirement liabilities | 6,122 |  |  | 4,622 |
Regulatory cost of removal obligation | 108,558 |  |  | 99,217 |
APT annual adjustment mechanism | 68,094 |  |  | 35,924 |
Regulatory excess deferred taxes (See Note 15) | 72,792 |  |  | 79,686 |
Other | 36,092 |  |  | 32,166 |
Total | $ | 835,557 |  |  | $ | 750,620 |
Deferred credits and other liabilities Deferred credits and other liabilities as of September 30, 2025 and 2024 were comprised of the following accounts.
| September 30
| 2025 |  | 2024
| (In thousands)
Pension and postretirement liabilities | $ | 68,398 |  |  | $ | 67,322 |
Operating lease liabilities (See Note 7) | 262,549 |  |  | 224,498 |
Customer advances for construction | 9,573 |  |  | 7,973 |
Other regulatory liabilities (See Note 3) | 332,017 |  |  | 279,979 |
Asset retirement obligation | 7,428 |  |  | 7,942 |
Liabilities from risk management activities | 146 |  |  | 313 |
APT annual adjustment mechanism | 31,299 |  |  | 37,195 |
Unrecognized tax benefits (See Note 15) | 50,210 |  |  | 46,174 |
Other | 22,702 |  |  | 20,536 |
Total | $ | 784,322 |  |  | $ | 691,932 |
Statement of Comprehensive Income Other non-operating income Other non-operating income for the fiscal years ended September 30, 2025, 2024, and 2023 were comprised of the following accounts.
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Equity component of AFUDC | $ | 75,425 |  |  | $ | 58,234 |  |  | $ | 64,019 |
Performance-based rate program | 8,485 |  |  | 8,389 |  |  | 7,093 |
Pension and other postretirement non-service credit | 14,372 |  |  | 10,820 |  |  | 8,955 |
Interest income | 29,944 |  |  | 22,887 |  |  | 7,207 |
Community support spending | (21,114) |  |  | (20,016) |  |  | (12,027) |
Unrealized gains on equity securities | 174 |  |  | 3,562 |  |  | 1,406 |
Miscellaneous | (17,545) |  |  | (12,830) |  |  | (6,878) |
Total | $ | 89,741 |  |  | $ | 71,046 |  |  | $ | 69,775 |
Statement of Cash Flows Supplemental disclosures of cash flow information for the fiscal years ended September 30, 2025, 2024, and 2023 were as follows:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (In thousands)
Cash Paid (Received) During The Period For: |  |  |  |  |
Interest (1) | $ | 349,222 |  |  | $ | 308,872 |  |  | $ | 249,066 |
Income taxes: |  |  |  |  |
Federal | $ | (5,000) |  |  | $ | 8,200 |  |  | $ | (4,500) |
State of Texas | 7,095 |  |  | 5,372 |  |  | 17,200 |
State of Louisiana | 2,357 |  |  | 1,739 |  |  | 2,232 |
Other states | — |  |  | 38 |  |  | 36 |
| $ | 4,452 |  |  | $ | 15,349 |  |  | $ | 14,968 |
Non-Cash Transactions: |  |  |  |  |
Capital expenditures included in current liabilities | $ | 327,814 |  |  | $ | 299,908 |  |  | $ | 186,912 |
(1) Cash paid during the period for interest, net of amounts capitalized was $155.3 million, $163.5 million, and $117.9 million for the fiscal years ended September 30, 2025, 2024, and 2023.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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