The following table sets forth the components of our regulatory assets and liabilities on our consolidated balance sheet (in thousands).

Regulatory Assets and Liabilities

	June 30, 2013			December 31, 2012
Regulatory Assets:
Current:
Under recovered fuel costs(1)	$	401		$	2,885
Current portion of long-term regulatory assets(1)	6,077			3,492
Regulatory assets, current(1)	6,478			6,377
Long-term:
Pension and other postretirement benefits(2)	130,626			136,480
Income taxes	47,816			48,759
Deferred construction accounting costs(3)	16,496			16,717
Unamortized loss on reacquired debt	11,415			12,142
Unsettled derivative losses — electric segment	6,372			6,557
System reliability — vegetation management	8,235			9,002
Storm costs(4)	5,257			4,828
Asset retirement obligation	4,554			4,430
Customer programs	4,702			4,356
Unamortized loss on interest rate derivative	1,013			1,147
Other	980			669
Deferred operating and maintenance expense	2,288			2,049
Under recovered fuel costs	819			314
Current portion of long-term regulatory assets	(6,077		)	(3,492		)
Regulatory assets, long-term	234,496			243,958
Total Regulatory Assets	$	240,974		$	250,335

	June 30, 2013			December 31, 2012
Regulatory Liabilities:
Current:
Over recovered fuel costs	$	1,652		$	2,381
Current portion of long-term regulatory liabilities(1)	3,351			3,089
Regulatory liabilities, current(1)	5,003			5,470
Long-term:
Costs of removal	90,278			83,368
SWPA payment for Ozark Beach lost generation	20,834			22,242
Income taxes	11,863			11,972
Deferred construction accounting costs — fuel	8,083			8,156
Unamortized gain on interest rate derivative	3,456			3,541
Pension and other postretirement benefits(5)	1,323			2,007
Over recovered fuel costs	1,409			3,691
Current portion of long-term regulatory liabilities(1)	(3,351		)	(3,089		)
Regulatory liabilities, long-term	133,895			131,888
Total Regulatory Liabilities	$	138,898		$	137,358

(1) Reflects over and under recovered costs of the current portion of regulatory assets or liabilities detailed in the long term sections below expected to be returned or recovered, as applicable, within the next 12 months in rates.

(2) Includes the effect of costs incurred that are more or less than those allowed in rates for Missouri (EDE and EDG) and Kansas (EDE) portion of pension and other postretirement benefit costs. Since January 1, 2013, regulatory assets have been reduced, and corresponding expenses have increased, as a result of ratemaking treatment.

(3)	Balances as of June 30, 2013	Deferred Carrying Charges		Deferred O&M		Depreciation		Total
	Iatan 1	$	2,637	$	1,319	$	1,598	$	5,554
	Iatan 2	3,788		4,097		2,663		10,548
	Plum Point	64		173		157		394
	Total							$	16,496

Balances as of December 31, 2012	Deferred Carrying Charges		Deferred O&M		Depreciation		Total
Iatan 1	$	2,678	$	1,339	$	1,622	$	5,639
Iatan 2	3,821		4,155		2,685		10,661
Plum Point	64		195		158		417
Total							$	16,717

(4) Reflects ice storm costs incurred in 2007 and costs incurred as a result of the May 2011 tornado.

(5) Includes the effect of costs incurred that are more or less than those allowed in rates for the Missouri (EDE and EDG) and Kansas (EDE) portion of pension and other postretirement benefit costs. Since January 1, 2013, regulatory liabilities and corresponding expenses have been reduced as a result of ratemaking treatment.