Early Plant Retirements (Tables)

9 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

As a result of these early nuclear plant retirement decisions, Exelon and Generation recognized incremental non-cash charges to earnings stemming from shortening the expected economic useful lives primarily related to accelerated depreciation of plant assets (including any ARC) and accelerated amortization of nuclear fuel, as well as operating and maintenance expenses. See Note 13 — Nuclear Decommissioning for additional information on changes to the nuclear decommissioning ARO balance. The total impact for the three and nine months ended September 30, 2019 and 2018 are summarized in the table below.



	Three Months Ended September 30,				Nine Months Ended September 30,
Income statement expense (pre-tax)	2019		2018		2019			2018
Depreciation and amortization^(a)
Accelerated depreciation	$	71	$	152	$	216		$	441
Accelerated nuclear fuel amortization	3		18		13			52
Operating and maintenance^(b)	39		4		(44		)	32
Total	$	113	$	174	$	185		$	525

_________


(a)	Reflects incremental accelerated depreciation and amortization for TMI for the three and nine months ended September 30, 2019. Reflects incremental accelerated depreciation for TMI and Oyster Creek for the three and nine months ended September 30, 2018. The Oyster Creek amounts are from February 2, 2018 through September 17, 2018. The TMI amounts are through September 20, 2019.

(b)

In 2019, primarily reflects the net impacts associated with the remeasurements of the TMI ARO in the first and third quarters. See Note 13 — Nuclear Decommissioning for additional information on the first quarter 2019 TMI ARO update. In 2018, primarily reflects materials and supplies inventory reserve adjustments, employee related costs and CWIP impairments associated with the early retirement decisions for TMI and Oyster Creek. Excludes the charges in the third quarter of 2018 and second quarter of 2019 to Operating and maintenance expense for the ARO remeasurement due to the sale of Oyster Creek. See Note 3 — Mergers, Acquisitions and Dispositions for additional information.

Implications of Potential Early Plant Retirement on Balance Sheet [Table Text Block]

The following table provides the balance sheet amounts as of September 30, 2019 for Exelon's and Generation’s significant assets and liabilities associated with the Mystic Units 8 and 9 and Everett Marine Terminal assets that would potentially be impacted by the failure to adopt long-term solutions for reliability and fuel security.



	September 30, 2019
Asset Balances
Materials and supplies inventory	$	31
Fuel inventory	5
Completed plant, net	889
Construction work in progress	7
Liability Balances
Asset retirement obligation	(2		)