SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2011

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of gross operating revenues by segments

Electric segment sales*	90.9%
Gas segment sales	8.0%
Other segment sales	1.1%

*

Sales from our electric segment include 0.3% from the sale of water.

Operating revenues

Schedule of asset retirement obligation

(000's)	Liability Balance 12/31/10		Liabilities Recognized		Liabilities Settled		Accretion		Cash Flow Revisions		Liability Balance at 12/31/11
Asset Retirement Obligation	$	3,757	$	—	$	—	$	187	$	—	$	3,944

(000's)	Liability Balance 12/31/09		Liabilities Recognized		Liabilities Settled		Accretion		Cash Flow Revisions		Liability Balance at 12/31/10
Asset Retirement Obligation	$	3,607	$	—	$	—	$	150	$	—	$	3,757

Schedule of fuel, materials and supplies

	2011		2010
Electric fuel inventory	$	27,431	$	17,648
Natural gas inventory		6,346		4,470
Materials and supplies		28,462		23,439
TOTAL	$	62,239	$	45,557

Schedule of weighted average number of shares

	2011		2010		2009
Weighted Average Number Of Shares
Basic		41,851,759		40,544,802		34,923,526
Dilutive Securities:
Performance-based restricted stock awards		18,222		14,991		20,513
Dividend equivalents		9,585		12,558		12,122
Employee stock purchase plan		3,815		7,170		103
Stock options		3,240		—		—
Time-based restricted stock awards		807		—		—
Total dilutive securities		35,669		34,719		32,738
Diluted weighted average number of shares		41,887,428		40,579,521		34,956,264
Antidilutive Shares		—		74,800		117,178

Gas

Operating revenues

Schedule of operating revenues by major customer classes

Customer	% of revenue
Residential		62.5	%
Commercial		26.9	%
Industrial		1.5	%
Other		9.1	%

Electric

Operating revenues

Schedule of operating revenues by major customer classes

Customer	% of revenue
Residential		42.4	%
Commercial		30.1	%
Industrial		15.1	%
Wholesale on-system		3.7	%
Wholesale off-system		4.5	%
Miscellaneous sources, primarily public authorities		2.6	%
Other electric revenues		1.6	%

Schedule of operating revenues, by jurisdiction

Jurisdiction	% of revenue
Missouri		88.8	%
Kansas		5.3	%
Arkansas		2.8	%
Oklahoma		3.1	%