Early Nuclear Plant Retirements Early Nuclear Plant Retirements (Tables)

3 Months Ended

Mar. 31, 2018

Property, Plant and Equipment [Abstract]

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

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.

Exelon's and Generation's first quarter 2018 results included a net incremental $178 million 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)	Q1 2018
Depreciation and amortization(a)
Accelerated depreciation(b)	$	137
Accelerated nuclear fuel amortization	15
Operating and maintenance(c)	26
Total	$	178

_________

(a) Reflects incremental accelerated depreciation and amortization for TMI for the quarter ended March 31, 2018, and for Oyster Creek from February 2, 2018 through March 31, 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 March 31, 2018 for Generation’s significant assets and liabilities associated with the Mystic Generating Station assets.

	March 31, 2018
Asset Balances
Materials and supplies inventory	$	26
Fuel inventory	18
Completed plant, net	896
Construction work in progress	4
Prepaid expense(a)	9
Liability Balances
Asset retirement obligation	(5		)
Accrued expense(a)	(2		)

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