Regulatory Assets and Liabilities (Tables)

3 Months Ended

Dec. 31, 2016

Components of regulatory assets and regulatory liabilities are summarized in the table below:



Regulatory Assets and Liabilities
	At December 31, 2016		At September 30, 2016
Current regulatory assets
Deferred nuclear generating units	$	237	$	237
Unrealized losses on commodity derivatives	104		122
Fuel cost adjustment receivable	41		98
Environmental agreements	27		34
Environmental cleanup costs - Kingston ash spill	42		42
Other current regulatory assets	3		3
Total current regulatory assets	454		536

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	5,330		5,385
Unrealized losses on interest rate derivatives	1,106		1,547
Nuclear decommissioning costs	935		938
Deferred nuclear generating units	915		850
Non-nuclear decommissioning costs	863		819
Environmental cleanup costs - Kingston ash spill	288		299
Unrealized losses on commodity derivatives	32		56
Environmental agreements	15		18
Other non-current regulatory assets	244		252
Total non-current regulatory assets	9,728		10,164
Total regulatory assets	$	10,182	$	10,700

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	151	$	148
Unrealized gains on commodity derivatives	22		6
Total current regulatory liabilities	173		154

Non-current regulatory liabilities
Unrealized gains on commodity derivatives	6		3
Total non-current regulatory liabilities	6		3
Total regulatory liabilities	$	179	$	157