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Income Taxes
 6 Months Ended
Jun. 30, 2023
Income Taxes [Abstract]  
Income Taxes

13.  Income Taxes

Under the Internal Revenue Service tangible property regulations, or TPR, the Company is permitted to deduct the costs of certain asset improvements that were previously being capitalized and depreciated for tax purposes as an expense on its income tax return.  This ongoing deduction results in a reduction in the effective income tax rate, a net reduction in income tax expense, and a reduction in the amount of income taxes currently payable.  It also results in increases to deferred tax liabilities and regulatory assets representing the appropriate book and tax basis difference on capital additions.

The Company’s effective tax rate was 9.9% and 3.2% for the three months ended June 30, 2023 and 2022, respectively, and 11.0% and (0.7)% for the six months ended June 30, 2023 and 2022, respectively.  The higher effective tax rate is primarily due to lower deductions from the TPR.  The effective tax rate will vary depending on the level of eligible asset improvements expensed for tax purposes under TPR each period.