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

Regulatory Assets and Liabilities

	September 30, 2013			December 31, 2012
Regulatory Assets:
Current:
Under recovered fuel costs(1)	$	302		$	2,885
Current portion of long-term regulatory assets(1)	6,096			3,492
Regulatory assets, current(1)	6,398			6,377
Long-term:
Pension and other postretirement benefits(2)	129,110			136,480
Income taxes	48,418			48,759
Deferred construction accounting costs	16,385			16,717
Unamortized loss on reacquired debt	11,246			12,142
Unsettled derivative losses — electric segment	5,613			6,557
System reliability — vegetation management	7,783			9,002
Storm costs(3)	5,084			4,828
Asset retirement obligation	4,616			4,430
Customer programs	4,785			4,356
Unamortized loss on interest rate derivative	1,001			1,147
Deferred operating and maintenance expense	1,863			2,049
Under recovered fuel costs	1,212			314
Current portion of long-term regulatory assets	(6,096		)	(3,492		)
Other	930			669
Regulatory assets, long-term	231,950			243,958
Total Regulatory Assets	$	238,348		$	250,335

	September 30, 2013			December 31, 2012
Regulatory Liabilities:
Current:
Over recovered fuel costs(1)	$	556		$	3,214
Current portion of long-term regulatory liabilities(1)	3,739			3,089
Regulatory liabilities, current(1)	4,295			6,303
Long-term:
Costs of removal	92,058			83,368
SWPA payment for Ozark Beach lost generation	20,105			22,242
Income taxes	11,736			11,972
Deferred construction accounting costs — fuel	8,047			8,156
Unamortized gain on interest rate derivative	3,414			3,541
Pension and other postretirement benefits(4)	2,377			2,007
Over recovered fuel costs	533			2,858
Current portion of long-term regulatory liabilities(1)	(3,739		)	(3,089		)
Regulatory liabilities, long-term	134,531			131,055
Total Regulatory Liabilities	$	138,826		$	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.

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

(4) 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.