Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2011

Debt Disclosure [Abstract]

Long-term debt

			December 31
	Year Due		2011			2010
KCP&L			(millions)
General Mortgage Bonds
4.87% EIRR bonds(a)(b)		2012-2035	$	119.3		$	158.8
7.15% Series 2009A (8.59% rate)(c)		2019		400.0			400.0
4.65% EIRR Series 2005		2035		50.0			50.0
EIRR Series 2007A-1(d)		2035		-			63.3
EIRR Series 2007A-2(d)		2035		-			10.0
5.375% EIRR Series 2007B		2035		73.2			73.2
Senior Notes
6.50% Series				-			150.0
5.85% Series (5.72% rate)(c)		2017		250.0			250.0
6.375% Series (7.49% rate)(c)		2018		350.0			350.0
6.05% Series (5.78% rate)(c)		2035		250.0			250.0
5.30% Series		2041		400.0			-
EIRR bonds 4.90% Series 2008		2038		23.4			23.4
Other		2012-2018		2.9			3.3
Current maturities				(12.7	)		(150.3	)
Unamortized discount				(4.2	)		(2.0	)
Total KCP&L excluding current maturities				1,901.9			1,629.7
Other Great Plains Energy
GMO First Mortgage Bonds 9.44% Series		2012-2021		11.2			12.4
GMO Pollution Control Bonds
5.85% SJLP Pollution Control		2013		5.6			5.6
0.164% Wamego Series 1996(e)		2026		7.3			7.3
0.353% State Environmental 1993(e)		2028		5.0			5.0
GMO Senior Notes
7.95% Series				-			137.3
7.75% Series				-			197.0
11.875% Series		2012		500.0			500.0
8.27% Series		2021		80.9			80.9
Fair Value Adjustment				16.3			49.9
GMO Medium Term Notes
7.16% Series		2013		6.0			6.0
7.33% Series		2023		3.0			3.0
7.17% Series		2023		7.0			7.0
Great Plains Energy 2.75% Senior Notes (3.67% rate)(c)		2013		250.0			250.0
Great Plains Energy 6.875% Senior Notes (7.33% rate)(c)		2017		100.0			100.0
Great Plains Energy 10.00% Equity Units Subordinated Notes		2012		287.5			287.5
Great Plains Energy 4.85% Senior Notes (7.34% rate)(c)		2021		350.0			-
Current maturities				(788.7	)		(335.4	)
Unamortized discount				(0.7	)		(0.5	)
Total Great Plains Energy excluding current maturities			$	2,742.3		$	2,942.7
(a) Weighted-average interest rates at December 31, 2011
(b) December 31, 2011, does not include $39.5 million EIRR Series 1993B bonds because the bonds have been repurchased and are held by KCP&L
(c) Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments
(d) December 31, 2011, does not include $63.3 million EIRR Series 2007 A-1and $10.0 million EIRR Series 2007 A-2 bonds because the bonds have
been repurchased and are held by KCP&L
(e) Variable rate

Amortization of debt expense

	2011		2010		2009
	(millions)
KCP&L	$	3.6	$	2.8	$	2.0
Other Great Plains Energy		4.5		3.6		2.4
Total Great Plains Energy	$	8.1	$	6.4	$	4.4

Schedule of settlement rate by applicable market value

Applicable		Settlement rate	Market value
market value		(in common shares)	per Equity Unit (a)
$16.80 or greater		2.9762 to 1	Greater than $50 per Equity Unit
$16.80 to $14.00		$50 divided by the applicable	Equal to $50 per Equity Unit
		market value to 1
$14.00 or less		3.5714 to 1	Less than $50 per Equity Unit
(a)	Assumes that the market price of the Company's common stock on June 15, 2012,
	is the same as the applicable market value.

Scheduled maturities

	2012		2013		2014		2015		2016
	(millions)
Great Plains Energy                              $		801.4	$	263.1	$	1.5	$	15.5	$	1.6
KCP&L		12.7		0.4		0.4		14.4		0.4