REGULATORY MATTERS (Details 2) (USD $)	12 Months Ended		0 Months Ended		12 Months Ended					0 Months Ended	12 Months Ended		12 Months Ended				0 Months Ended		0 Months Ended		0 Months Ended					0 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	May 22, 2011 Missouri 2012 Rate Case	Apr. 02, 2013 Missouri Public Service Commission (MPSC) Missouri 2012 Rate Case	Dec. 31, 2013 Missouri Public Service Commission (MPSC) Missouri 2012 Rate Case	Dec. 31, 2013 Missouri Public Service Commission (MPSC) Missouri 2012 Rate Case Iatan2	Dec. 31, 2012 Missouri Public Service Commission (MPSC) Electric Missouri 2012 Rate Case	Apr. 02, 2013 Missouri Public Service Commission (MPSC) Electric Missouri 2012 Rate Case	Jul. 06, 2012 Missouri Public Service Commission (MPSC) Electric Missouri 2012 Rate Case	Jun. 15, 2011 Missouri Public Service Commission (MPSC) Electric Missouri 2010 Rate Case	Jun. 15, 2011 Missouri Public Service Commission (MPSC) Electric Missouri 2010 Rate Case	Sep. 28, 2010 Missouri Public Service Commission (MPSC) Electric Missouri 2010 Rate Case	Dec. 31, 2013 Missouri Public Service Commission (MPSC) Electric Tornado Recovery	Nov. 23, 2012 Missouri Public Service Commission (MPSC) Water Missouri 2012 Rate Case	Oct. 18, 2012 Missouri Public Service Commission (MPSC) Water Missouri 2012 Rate Case	May 21, 2012 Missouri Public Service Commission (MPSC) Water Missouri 2012 Rate Case	Jun. 17, 2011 Kansas Corporation Commission (KCC) Electric Kansas 2011 Rate Case	Jan. 02, 2012 Kansas Corporation Commission (KCC) Electric Kansas 2011 Rate Case	Mar. 25, 2010 Oklahoma Corporation Commission (OCC) Electric Capital cost recovery rider (CCRR) item	Jan. 04, 2012 Oklahoma Corporation Commission (OCC) Electric Oklahoma 2011 Rate Case	Jan. 04, 2012 Oklahoma Corporation Commission (OCC) Electric Capital Reliability Rider (CRR)	Jun. 30, 2011 Oklahoma Corporation Commission (OCC) Electric Capital Reliability Rider (CRR)	Mar. 02, 2011 Oklahoma Corporation Commission (OCC) Electric Phase 2 Capital Reliability Rider (CRR)	Dec. 03, 2013 Arkansas Public Service Commission (APSC) Electric Arkansas 2013 Rate Case	Apr. 13, 2011 Arkansas Public Service Commission (APSC) Electric Arkansas 2010 Rate Case	Jul. 31, 2012 Federal Energy Regulatory Commission (FERC)	Jun. 13, 2013 Federal Energy Regulatory Commission (FERC) TFR rate case	Nov. 30, 2011 Federal Energy Regulatory Commission (FERC) GFR rate case.
REGULATORY MATTERS
Test period for operating expense taken as a basis for increase in base rate	12 months
RATE MATTERS
Approved amount of annual increase in base rate								$ 27,500,000		$ 18,700,000	$ 18,700,000			$ 450,000				$ 1,250,000		$ 240,722			$ 1,063,100		$ 2,104,321
Approved percentage of annual increase in base rate								6.78%		4.70%	4.70%			25.50%				5.20%			1.66%		9.32%		19.00%
Deferred tornado costs recovery period			10 years	10 years
Write-off of various items including disallowance for the prudency of certain construction expenditures					3,600,000
Loss on plant disallowance	2,409,000	150,000				2,400,000
Reverse gain on sale of Asbury unit train	1,236,000				1,200,000
Requested amount of annual increase in electric base rate									30,700,000			36,500,000				516,400	1,500,000					600,000		2,200,000
Period to recover costs in Kansas																	3 years
Percentage of annual base rate increase requested									7.56%			9.20%				29.60%	6.39%					4.10%		18.00%
Tax benefits of cost of removal to be flowed through to customers							9,600,000
Amount of increase in base rate for which unanimous agreement filed															450,000
Annual regulatory amortization expense terminated as a result of rate case settlement										14,500,000	14,500,000
Base rate revenue included in authorized amount of increase in annual revenues																					200,000
Deferred depreciation, operations and maintenance, and carrying costs related to capital expenditure													3,700,000
Amortization period for deferred asset related to the tax benefits of cost of removal													10 years
Number of steps requested under the capital cost recovery rider preceding a general rate case																			3
Period for which rate suspended																										5 months
Percentage of ROE																											10.00%
Accumulated provision - rate refunds																												1,300,000
Period within which SWPA payment will be made to customers										10 years
Base rate increase request annual decrease to expenses											$ 1,400,000