Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2011

Regulatory Matters

Components of regulatory assets and liabilities

Regulatory Assets and Liabilities

	June 30, 2011		December 31, 2010
Regulatory Assets:
Under recovered electric fuel and purchased power costs — current	$	1,564	$	4,974
Regulatory assets, current(1)	1,564		4,974
Pension and other postretirement benefits(2)	87,932		92,192
Income taxes	50,084		50,188
Unamortized loss on reacquired debt	12,355		13,099
Deferred operating and maintenance expenses	166		—
Unamortized loss on interest rate derivative	1,619		1,776
Asbury five-year maintenance	719		948
Storm costs(3)	6,351		7,733
Deferred construction accounting costs(4)	16,964		10,521
Asset retirement obligation	3,493		3,412
Under recovered electric fuel and purchased gas costs	2,980		—
Under recovered purchased gas costs — gas segment	—		439
Unsettled derivative losses — electric segment	3,489		3,166
Customer programs	2,988		2,119
System reliability — vegetation management	4,095		3,338
Other	608		473
Regulatory assets, long-term	193,843		189,404
Total	$	195,407	$	194,378

	June 30, 2011		December 31, 2010
Regulatory Liabilities:
Over recovered purchased gas costs — gas segment - current	$	264	$	1,243
Regulatory liabilities, current(1)	264		1,243
Cost of removal	67,794		62,756
SWPA payment for Ozark Beach lost generation	26,424		—
Income taxes	12,539		12,715
Unamortized gain on interest rate derivative	3,796		3,881
Pension and other postretirement benefits(5)	3,528		4,604
Deferred construction accounting costs — fuel	8,384		3,126
Over recovered electric fuel and purchased power costs	245		155
Over recovered purchased gas costs — gas segment	1,130		—
Other	—		342
Regulatory liabilities, long-term	123,840		87,579
Total	$	124,104	$	88,822

(1)  Reflects under or over recovered costs expected to be recovered within the next 12 months in Missouri rates.

(2) Primarily reflects regulatory assets resulting from the unfunded portion of our pension and OPEB liabilities and regulatory accounting for EDG acquisition costs. Approximately $0.2 million in pension and other postretirement benefit costs have been recognized since January 1, 2011 to reflect the amortization of the regulatory assets that were recorded at the time of the EDG acquisition of the Aquila, Inc. gas properties.

(3)  Primarily reflects ice storm costs incurred in 2007.

(4) Balances as of June 30, 2011	Deferred Carrying Charges		Deferred O&M	Depreciation	Total
Iatan 1	$	2,753	1,376	1,667	$	5,796
Iatan 2	$	3,925	4,244	2,648	$	10,817
Plum Point	$	66	173	112	$	351
Total					$	16,964

Balances as of December 31, 2010	Deferred Carrying Charges		Deferred O&M	Depreciation	Total
Iatan 1	$	2,779	1,388	1,682	$	5,849
Iatan 2	$	1,770	1,643	1,111	$	4,524
Plum Point	$	33	70	45	$	148
Total					$	10,521

(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, 2011, regulatory liabilities and corresponding expenses have been reduced by approximately $0.6 million as a result of ratemaking treatment.

Schedule of deferred construction accounting costs

(4) Balances as of June 30, 2011	Deferred Carrying Charges		Deferred O&M	Depreciation	Total
Iatan 1	$	2,753	1,376	1,667	$	5,796
Iatan 2	$	3,925	4,244	2,648	$	10,817
Plum Point	$	66	173	112	$	351
Total					$	16,964

Balances as of December 31, 2010	Deferred Carrying Charges		Deferred O&M	Depreciation	Total
Iatan 1	$	2,779	1,388	1,682	$	5,849
Iatan 2	$	1,770	1,643	1,111	$	4,524
Plum Point	$	33	70	45	$	148
Total					$	10,521