SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of gross operating revenues by segments

Electric segment sales*	91.7%
Gas segment sales	7.1%
Other segment sales	1.2%

*

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

Operating revenues

Schedule of asset retirement obligation

(000's)	Liability Balance 12/31/11		Liabilities Recognized		Liabilities Settled		Accretion		Cash Flow Revisions		Liability Balance at 12/31/12
Asset Retirement Obligation	$	3,944	$	—	$	—	$	252	$	515	$	4,711

(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

Schedule of fuel, materials and supplies

Fuel, materials and supplies consist primarily of coal, natural gas in storage and materials and supplies, which are reported at average cost. These balances are as follows (in thousands):

	2012		2011
Electric fuel inventory	$	27,954	$	27,431
Natural gas inventory		4,776		6,346
Materials and supplies		29,140		28,462
TOTAL	$	61,870	$	62,239

Schedule of weighted average number of shares

	2012		2011		2010
Weighted Average Number Of Shares
Basic		42,256,641		41,851,759		40,544,802
Dilutive Securities:
Performance-based restricted stock awards		14,500		18,222		14,991
Dividend equivalents		6,329		9,585		12,558
Employee stock purchase plan		1,996		3,815		7,170
Stock options		3,160		3,240		—
Time-based restricted stock awards		1,820		807		—
Total dilutive securities		27,805		35,669		34,719
Diluted weighted average number of shares		42,284,446		41,887,428		40,579,521
Antidilutive Shares		128,500		128,500		74,800

Gas

Operating revenues

Schedule of operating revenues by major customer classes

Customer	% of revenue
Residential		62.1	%
Commercial		27.1
Industrial		1.2
Other		9.6

Electric

Operating revenues

Schedule of operating revenues by major customer classes

Customer	% of revenue
Residential		42.2	%
Commercial		31.2
Industrial		15.5
Wholesale on-system		3.6
Wholesale off-system		3.1
Miscellaneous sources, primarily public authorities		2.7
Other electric revenues		1.7

Schedule of operating revenues, by jurisdiction

Jurisdiction	% of revenue
Missouri		89.3	%
Kansas		5.1
Arkansas		2.7
Oklahoma		2.9