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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The Registrants reported the following effective tax rates:
Three Months Ended March 31,
20242023
CenterPoint Energy (1)
18 %19 %
Houston Electric (2)
20 %23 %
CERC (3)
19 %22 %

(1)CenterPoint Energy’s lower effective tax rate for the three months ended March 31, 2024 compared to the same period ended March 31, 2023 was primarily due to the tax impacts of the state deferred remeasurement benefit of $25 million related to the Louisiana and Mississippi natural gas LDC businesses sale, which met the held for sale criteria in the first quarter of 2024 and is described further below. This was partially offset by the tax impacts of the valuation allowance of $21 million established against Louisiana and Mississippi NOLs, since those NOLs will not be utilized due to the Louisiana and Mississippi natural gas LDC businesses sale. See Note 3 for further details.
(2)Houston Electric’s lower effective tax rate for the three months ended March 31, 2024 compared to the same period ended March 31, 2023 was primarily driven by a decrease in state income taxes and an increase in EDIT amortization.
(3)CERC’s lower effective tax rate for the three months ended March 31, 2024 compared to the same period ended March 31, 2023 was primarily driven by the tax impacts of the state deferred remeasurement benefit of $24 million associated with the Louisiana and Mississippi natural gas LDC businesses sale meeting the held for sale criteria in the first quarter of 2024. For tax purposes, when the held for sale criteria is met, the CERC and unitary state apportionment rates must be updated to account for the sale and applied to the estimated post-sale net deferred tax liability. This impact was partially offset by the tax impacts of a valuation allowance of $21 million against Louisiana and Mississippi NOLs, since those NOLs will not be utilized due to the Louisiana and Mississippi natural gas LDC businesses sale. Additionally, state income tax expense has decreased as a result of higher revenues in states with lower tax rates.