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Taxes on Income (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Taxes on income |  |  |
Unrecognized Tax Benefits | $ 0 | $ 0 | $ 0
Deferred tax assets: |  |  |
Regulatory-liability-related | 28,851,000 | 32,042,000 |
Contributions and advances | 6,768,000 | 6,660,000 |
Deferred Tax Assets, Other | 5,801,000 | 5,924,000 |
Deferred tax assets | 41,420,000 | 44,626,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (169,666,000) | (161,820,000) |
Regulatory-asset-related: depreciation and other | (43,149,000) | (36,337,000) |
Balancing and memorandum accounts (non-flow-through) | (8,778,000) | (8,046,000) |
Deferred tax liabilities | (221,593,000) | (206,203,000) |
Accumulated deferred income taxes - net | (180,173,000) | (161,577,000) |
Current |  |  |
Federal | 19,680,000 | 26,327,000 | 14,845,000
State | 8,451,000 | 10,489,000 | 6,016,000
Total current tax expense | 28,131,000 | 36,816,000 | 20,861,000
Deferred |  |  |
Federal | 1,656,000 | 4,157,000 | 2,991,000
State | 386,000 | 626,000 | (188,000)
Total deferred tax (benefit) expense | 2,042,000 | 4,783,000 | 2,803,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 31,383,000 | 34,969,000 | 21,433,000
Increase (decrease) in taxes resulting from: | 6,508,000 | 9,785,000 | 4,335,000
Excess deferred tax amortization | (1,467,000) | (1,648,000) | (1,311,000)
Flow-through on fixed assets | 1,075,000 | 1,067,000 | 1,076,000
Flow-through on removal costs | (3,096,000) | (2,255,000) | (1,802,000)
Tax Adjustments, Release of Regulatory Liability | (5,015,000) | 0 | 0
Investment tax credit | (69,000) | (71,000) | (71,000)
Other- net | 854,000 | (248,000) | 4,000
Total income tax expense operations | 30,173,000 | 41,599,000 | 23,664,000
Income before income taxes | $ 149,441,000 | $ 166,520,000 | $ 102,060,000
Effective income tax rate (as a percent) | 20.20% | 25.00% | 23.20%
Income tax effect, excess deferred income taxes estimate change | $ 5,000,000 |  |
GSWC |  |  |
Deferred tax assets: |  |  |
Regulatory-liability-related | 27,171,000 | $ 30,407,000 |
Contributions and advances | 7,103,000 | 6,981,000 |
Deferred Tax Assets, Other | 5,632,000 | 6,041,000 |
Deferred tax assets | 39,906,000 | 43,429,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (162,366,000) | (155,131,000) |
Regulatory-asset-related: depreciation and other | (39,635,000) | (33,242,000) |
Balancing and memorandum accounts (non-flow-through) | (4,315,000) | (2,514,000) |
Deferred tax liabilities | (206,316,000) | (190,887,000) |
Accumulated deferred income taxes - net | (166,410,000) | (147,458,000) |
Current |  |  |
Federal | 13,570,000 | 22,564,000 | $ 10,582,000
State | 6,551,000 | 10,176,000 | 4,909,000
Total current tax expense | 20,121,000 | 32,740,000 | 15,491,000
Deferred |  |  |
Federal | 1,362,000 | 2,867,000 | 1,507,000
State | 1,386,000 | 82,000 | (652,000)
Total deferred tax (benefit) expense | 2,748,000 | 2,949,000 | 855,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 24,640,000 | 29,063,000 | 14,724,000
Increase (decrease) in taxes resulting from: | 5,772,000 | 9,169,000 | 3,119,000
Excess deferred tax amortization | (1,491,000) | (1,681,000) | (1,130,000)
Flow-through on fixed assets | 1,058,000 | 1,041,000 | 1,010,000
Flow-through on removal costs | (3,029,000) | (2,225,000) | (1,715,000)
Tax Adjustments, Release of Regulatory Liability | (5,015,000) | 0 | 0
Investment tax credit | (69,000) | (71,000) | (71,000)
Other- net | 1,003,000 | 393,000 | 409,000
Total income tax expense operations | 22,869,000 | 35,689,000 | 16,346,000
Income before income taxes | $ 117,332,000 | $ 138,397,000 | $ 70,116,000
Effective income tax rate (as a percent) | 19.50% | 25.80% | 23.30%

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