Regulatory Assets and Liabilities (Tables)

9 Months Ended

Jun. 30, 2013

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



Regulatory Assets and Liabilities
	At June 30, 2013		At September 30, 2012
Current regulatory assets
Deferred nuclear generating units	$	237	$	237
Unrealized losses on commodity derivatives	176		310
Environmental agreements	74		87
Environmental cleanup costs - Kingston ash spill	72		72
Fuel cost adjustment receivable	—		68
Total current regulatory assets	559		774

Non-current regulatory assets
Deferred pension costs and other post-retirement benefits costs	5,237		5,517
Unrealized losses on interest rate derivatives	867		1,332
Nuclear decommissioning costs	922		914
Environmental cleanup costs - Kingston ash spill	738		797
Construction costs	619		619
Non-nuclear decommissioning costs	573		550
Deferred nuclear generating units	295		473
Environmental agreements	219		237
Unrealized losses on commodity derivatives	137		335
Other non-current regulatory assets	338		353
Total non-current regulatory assets	9,945		11,127
Total regulatory assets	$	10,504	$	11,901

Current regulatory liabilities
Fuel cost adjustment tax equivalents	$	176	$	173
Fuel cost adjustment liability	25		—
Unrealized gains on commodity derivatives	7		18
Total current regulatory liabilities	208		191

Non-current regulatory liabilities
Unrealized gains on commodity derivatives	4		109
Total non-current regulatory liabilities	4		109
Total regulatory liabilities	$	212	$	300