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Taxes on Income (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Taxes on income |  |  |
Unrecognized Tax Benefits | $ 0 | $ 0 | $ 0
Deferred tax assets: |  |  |
Regulatory-liability-related | 32,042,000 | 31,330,000 |
Contributions and advances | 6,660,000 | 6,544,000 |
Deferred Tax Assets, Other | 5,924,000 | 7,424,000 |
Deferred tax assets | 44,626,000 | 45,298,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (161,820,000) | (155,955,000) |
Regulatory-asset-related: depreciation and other | (36,337,000) | (30,226,000) |
Balancing and memorandum accounts (non-flow-through) | (8,046,000) | (8,794,000) |
Deferred tax liabilities | (206,203,000) | (194,975,000) |
Accumulated deferred income taxes - net | (161,577,000) | (149,677,000) |
Current |  |  |
Federal | 26,327,000 | 14,845,000 | 19,592,000
State | 10,489,000 | 6,016,000 | 7,270,000
Total current tax expense | 36,816,000 | 20,861,000 | 26,862,000
Deferred |  |  |
Federal | 4,157,000 | 2,991,000 | 2,802,000
State | 626,000 | (188,000) | 759,000
Total deferred tax (benefit) expense | 4,783,000 | 2,803,000 | 3,561,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 34,969,000 | 21,433,000 | 26,202,000
Increase (decrease) in taxes resulting from: | 9,785,000 | 4,335,000 | 6,425,000
Excess deferred tax amortization | (1,648,000) | (1,311,000) | (1,356,000)
Flow-through on fixed assets | 1,067,000 | 1,076,000 | 1,069,000
Flow-through on removal costs | (2,255,000) | (1,802,000) | (1,962,000)
Investment tax credit | (71,000) | (71,000) | (71,000)
Other- net | (248,000) | 4,000 | 116,000
Total income tax expense operations | 41,599,000 | 23,664,000 | 30,423,000
Income before income taxes | $ 166,520,000 | $ 102,060,000 | $ 124,770,000
Effective income tax rate (as a percent) | 25.00% | 23.20% | 24.40%
GSWC |  |  |
Deferred tax assets: |  |  |
Regulatory-liability-related | $ 30,407,000 | $ 29,623,000 |
Contributions and advances | 6,981,000 | 6,896,000 |
Deferred Tax Assets, Other | 6,041,000 | 7,874,000 |
Deferred tax assets | 43,429,000 | 44,393,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (155,131,000) | (150,133,000) |
Regulatory-asset-related: depreciation and other | (33,242,000) | (28,489,000) |
Balancing and memorandum accounts (non-flow-through) | (2,514,000) | (4,559,000) |
Deferred tax liabilities | (190,887,000) | (183,181,000) |
Accumulated deferred income taxes - net | (147,458,000) | (138,788,000) |
Current |  |  |
Federal | 22,564,000 | 10,582,000 | $ 13,698,000
State | 10,176,000 | 4,909,000 | 6,089,000
Total current tax expense | 32,740,000 | 15,491,000 | 19,787,000
Deferred |  |  |
Federal | 2,867,000 | 1,507,000 | 2,251,000
State | 82,000 | (652,000) | 57,000
Total deferred tax (benefit) expense | 2,949,000 | 855,000 | 2,308,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 29,063,000 | 14,724,000 | 19,175,000
Increase (decrease) in taxes resulting from: | 9,169,000 | 3,119,000 | 4,923,000
Excess deferred tax amortization | (1,681,000) | (1,130,000) | (1,184,000)
Flow-through on fixed assets | 1,041,000 | 1,010,000 | 1,008,000
Flow-through on removal costs | (2,225,000) | (1,715,000) | (1,954,000)
Investment tax credit | (71,000) | (71,000) | (71,000)
Other- net | 393,000 | 409,000 | 198,000
Total income tax expense operations | 35,689,000 | 16,346,000 | 22,095,000
Income before income taxes | $ 138,397,000 | $ 70,116,000 | $ 91,310,000
Effective income tax rate (as a percent) | 25.80% | 23.30% | 24.20%

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