Asset Retirement Obligations and Accrued Environmental Costs

6 Months Ended

Jun. 30, 2024

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations and Accrued Environmental Costs

9. Asset Retirement Obligations and Accrued Environmental Costs

	Successor
	June 30, 2024		December 31, 2023
Asset retirement obligations	$	484	$	464
Accrued environmental costs	23		23
Total asset retirement obligations and accrued environmental costs	507		487
Less: asset retirement obligations and accrued environmental costs due within one year (a)	34		18
Asset retirement obligations and accrued environmental costs due after one year	$	473	$	469

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(a)Presented as “Other current liabilities” on the Consolidated Statements of Operations.

Asset Retirement Obligations

The changes of the ARO carrying value were:

	ARO Rollforward
Carrying value, December 31, 2023 (Successor)	$	464
Obligations settled	(7)
Accretion expense	27
Carrying value, June 30, 2024 (Successor)	$	484

Supplemental information for the ARO:

	Successor
	June 30, 2024		December 31, 2023
Supplemental Information
Nuclear (a)	$	227	$	214
Non-Nuclear (b)	257		250
Carrying value	$	484	$	464

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(a)Obligations are expected to be settled with available funds in the NDT at the time of decommissioning.

(b)Certain obligations are: (i) partially supported by surety bonds, some of which have been collateralized with cash and (or) LCs; or (ii) partially prefunded under phased installment agreements.

See Note 12 for additional information on Susquehanna’s NDT.

See “Talen Montana Financial Assurance” in Note 10 for additional information on Talen Montana’s requirement to provide financial assurance related to certain environmental decommissioning and remediation liabilities related to the Colstrip Units.