CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Income Statement [Abstract] | ||||
| Operating Revenues | $ 565,841 | $ 544,515 | $ 1,337,227 | $ 1,317,495 |
| Operating Expenses | ||||
| Fuel and Purchased Power | 177,050 | 161,928 | 391,722 | 393,950 |
| Operations and Maintenance | 112,641 | 115,526 | 354,191 | 326,712 |
| Depreciation | 67,313 | 59,183 | 189,726 | 175,021 |
| Amortization | 9,221 | 7,793 | 26,808 | 23,195 |
| Taxes Other Than Income Taxes | 18,479 | 18,414 | 56,178 | 55,471 |
| Total Operating Expenses | 384,704 | 362,844 | 1,018,625 | 974,349 |
| Operating Income | 181,137 | 181,671 | 318,602 | 343,146 |
| Other Income (Expense) | ||||
| Interest Expense | (29,326) | (29,652) | (88,450) | (91,013) |
| Allowance For Borrowed Funds | 3,120 | 4,219 | 12,333 | 13,117 |
| Allowance For Equity Funds | 7,112 | 9,417 | 27,205 | 30,368 |
| Unrealized Gains (Losses) on Investments | (804) | 1,367 | 888 | 3,075 |
| Interest Income | 3,418 | 1,062 | 7,834 | 4,722 |
| Other, Net | (1,346) | (1,187) | 676 | (2,811) |
| Total Other Income (Expense) | (17,826) | (14,774) | (39,514) | (42,542) |
| Income Before Income Tax Expense | 163,311 | 166,897 | 279,088 | 300,604 |
| Income Tax Expense | 13,696 | 22,510 | 24,521 | 40,124 |
| Net Income | $ 149,615 | $ 144,387 | $ 254,567 | $ 260,480 |
| X | ||||||||||
- Definition Fuel And Purchased Power Costs No definition available.
|
| X | ||||||||||
- Definition The amount of amortization of deferred charges applied against earnings during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of interest income earned from interest bearing assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of unrealized gain (loss) on investment. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of operating expenses for the period that are associated with the utility's normal revenue producing operation; including selling, general, and administrative expenses, costs incurred for routine plant repairs and maintenance, and operations. No definition available.
|