Early Plant Retirements (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Restructuring and Related Costs [Table Text Block]

The total impact for the three and nine months ended September 30, 2021 and 2020 in Exelon's and Generation's Consolidated Statements of Operations and Comprehensive Income resulting from the initial decision and subsequent reversal of the decision to early retire Byron and Dresden is summarized in the table below.

Income statement expense (pre-tax)	Three Months Ended September 30, 2021		Nine Months Ended September 30, 2021		Three and Nine Months Ended September 30, 2020
Depreciation and amortization
Accelerated depreciation(a)	$	574	$	1,805	$	254
Accelerated nuclear fuel amortization	42		148		14
Operating and maintenance
One-time charges	(94)		(94)		220
Other charges	4		8		34
Contractual offset(b)	(60)		(451)		(129)
Total	$	466	$	1,416	$	393

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(a)Includes the accelerated depreciation of plant assets including any ARC.

(b)Reflects contractual offset for ARO accretion and ARC depreciation and excludes any changes in earnings in the NDT funds. Decommissioning-related impacts were not offset for the Byron units starting in the second quarter of 2021 due to the inability to recognize a regulatory asset at ComEd. With Generation’s September 15, 2021 reversal of the previous decision to retire Byron, Generation resumed contractual offset for Byron as of that date. Based on the regulatory agreement with the ICC, decommissioning-related activities are offset in Exelon's and Generation's Consolidated

Statements of Operations and Comprehensive Income as long as the net cumulative decommissioning-related activities result in a regulatory liability at ComEd. The offset resulted in an equal adjustment to the noncurrent payables to ComEd at Generation and an adjustment to the regulatory liabilities at ComEd. See Note 8 — Nuclear Decommissioning for additional information.