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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment includes the following:
December 31, 2023December 31, 2022
Weighted Average Useful LivesProperty, Plant and Equipment, GrossAccumulated Depreciation & AmortizationProperty, Plant and Equipment, NetProperty, Plant and Equipment, GrossAccumulated Depreciation & AmortizationProperty, Plant and Equipment, Net
(in years)(in millions)
CenterPoint Energy
Electric transmission and distribution 37$19,151 $4,762 $14,389 $19,154 $5,317 $13,837 
Electric generation (1)251,381 315 1,066 2,120 813 1,307 
Natural gas distribution3216,492 4,337 12,155 15,097 4,135 10,962 
Finance ROU asset mobile generation7.5662 136 526 662 41 621 
Other property222,710 993 1,717 695 279 416 
Total $40,396 $10,543 $29,853 $37,728 $10,585 $27,143 
Houston Electric
Electric transmission and distribution37$16,800 $3,641 $13,159 $14,791 $3,556 $11,235 
Finance ROU asset mobile generation7.5662 136 526 662 41 621 
Other property202,053 692 1,361 2,300 695 1,605 
Total$19,515 $4,469 $15,046 $17,753 $4,292 $13,461 
CERC
Natural gas distribution31$15,591 $4,136 $11,455 $14,316 $3,946 $10,370 
Other property1581 33 48 63 27 36 
Total $15,672 $4,169 $11,503 $14,379 $3,973 $10,406 

(1)SIGECO and AGC own a 300 MW unit at the Warrick Power Plant (Warrick Unit 4) as tenants in common as of December 31, 2023. SIGECO’s share of the cost of this unit as of December 31, 2023, is $198 million with accumulated depreciation totaling $171 million. Under the operating agreement, AGC and SIGECO shared equally in the cost of operation and output of the unit. SIGECO’s share of operating costs is included in Operation and maintenance expense in CenterPoint Energy’s Statements of Consolidated Income. SIGECO exited joint operations of Warrick 4 on January 1, 2024.
Depreciation and Amortization
The following table presents depreciation and amortization expense for 2023, 2022 and 2021:
 Year Ended December 31,
 202320222021
 CenterPoint EnergyHouston ElectricCERCCenterPoint EnergyHouston ElectricCERCCenterPoint EnergyHouston ElectricCERC
 (in millions)
Depreciation$1,092 $484 $459 $1,013 $434 $420 $1,024 $391 $466 
Amortization of securitized regulatory assets
163 155 — 191 191 — 213 213 — 
Other amortization
146 109 34 84 45 28 79 38 17 
Total
$1,401 $748 $493 $1,288 $670 $448 $1,316 $642 $483 
Asset Retirement Obligation
A reconciliation of the changes in the ARO liability recorded in Other non-current liabilities on each of the Registrants’ respective Consolidated Balance Sheets is as follows:
 December 31, 2023December 31, 2022
 
CenterPoint Energy
Houston Electric
CERC
CenterPoint Energy
Houston Electric
CERC
 (in millions)
Beginning balance$610 $36 $420 $659 $42 $479 
Accretion expense (1)
23 1 16 20 1 15 
Revisions in estimates (2)
(43)3 (56)(69)(7)(74)
Ending balance$590 $40 $380 $610 $36 $420 

(1)Reflected in Regulatory assets on each of the Registrants’ respective Consolidated Balance Sheets.
(2)In 2023 and 2022, CenterPoint Energy and CERC reflected a decrease in their respective ARO liability, which was primarily attributable to increases in the long-term interest rates used for discounting in the ARO calculation. In 2023, Houston Electric reflected an increase in its ARO liability attributable to an increase in discount rates and disposal costs, while in 2022, Houston Electric reflected a decrease in its ARO liability, which was primarily attributable to increases in the long-term interest rates used for discounting in the ARO calculation.