Early Nuclear Plant Retirements Early Nuclear Plant Retirements (Tables)

6 Months Ended

Jun. 30, 2018

Property, Plant and Equipment [Abstract]

Schedule of Other Operating Cost and Expense, by Component [Table Text Block]

In 2017, PSEG made public similar financial challenges facing its New Jersey nuclear plants including Salem, of which Generation owns a 42.59% ownersh

Exelon's and Generation's results include a net incremental $173 million and $351 million, respectively, of total pre-tax expense associated with the early retirement decisions for TMI and Oyster Creek, as summarized in the table below.

Income statement expense (pre-tax)	Q2 2018		YTD 2018
Depreciation and amortization(a)
Accelerated depreciation(b)	$	152	$	289
Accelerated nuclear fuel amortization	19		34
Operating and maintenance(c)	2		28
Total	$	173	$	351

_________

(a) Reflects incremental accelerated depreciation and amortization for TMI and Oyster Creek for the three and six months ended June 30, 2018. The Oyster Creek year-to-date amounts are from February 2, 2018 through June 30, 2018.

(b) Reflects incremental accelerated depreciation of plant assets, including any ARC.

(c) Primarily includes materials and supplies inventory reserve adjustments, employee related costs and CWIP impairments.

The following table provides the balance sheet amounts as of June 30, 2018 for Generation’s significant assets and liabilities associated with the Mystic Generating Station assets.

	June 30, 2018
Asset Balances
Materials and supplies inventory	$	26
Fuel inventory	19
Completed plant, net	887
Construction work in progress	3
Prepaid expenses(a)	11
Liability Balances
Asset retirement obligation	(5		)
Accrued expenses(a)	(2		)

Exelon's and Generation's 2017 results included a net incremental $339 million of total pre-tax expense associated with the early retirement decision for TMI, as summarized in the table below.

Income statement expense (pre-tax)	Q2 2017		Q3 2017		Q4 2017		YTD 2017
Depreciation and amortization(a)
Accelerated depreciation(b)	$	35	$	106	$	109	$	250
Accelerated nuclear fuel amortization	2		6		4		12
Operating and maintenance(c)	71		5		1		77
Total	$	108	$	117	$	114	$	339

_________

(a) Reflects incremental charges for TMI including incremental accelerated depreciation and amortization from May 30, 2017 through December 31, 2017.

(b) Reflects incremental accelerated depreciation of plant assets, including any ARC.

(c) Primarily includes materials and supplies inventory reserve adjustments, employee related costs and CWIP impairments.