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Nuclear Plant (Tables)
 12 Months Ended
Dec. 31, 2012
Nuclear Plant [Abstract]  
Changes in nuclear decommissioning trust fund
The following table summarizes the change in Great Plains Energy's and KCP&L's nuclear decommissioning trust fund.
 
2012
 
2011
Decommissioning Trust
 
(millions)
 
Beginning balance January 1
 
$
135.3

 
 
 
$
129.2

 
Contributions
 
3.3

 
 
 
3.4

 
Earned income, net of fees
 
3.0

 
 
 
4.8

 
Net realized gains
 
1.0

 
 
 
0.3

 
Net unrealized gains (losses)
 
12.1

 
 
 
(2.4
)
 
Ending balance December 31
 
$
154.7

 
 
 
$
135.3

 
Detail of assets held in nuclear decommissioning trust fund
The nuclear decommissioning trust is reported at fair value on the balance sheets and is invested in assets as detailed in the following table.
 
December 31
 
2012
 
 
 
2011
 
 
Cost
Basis

Unrealized Gains
 
Unrealized
Losses
 
Fair
Value
 
Cost
Basis
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(millions)
 
Equity securities
$
80.6

 
 
$
21.1

 
 
 
$
(1.6
)
 
 
 
$
100.1

 
 
 
$
76.5

 
 
 
$
12.3

 
 
 
$
(4.5
)
 
 
 
$
84.3

 
Debt securities
46.6

 
 
4.9

 
 
 
(0.1
)
 
 
 
51.4

 
 
 
44.2

 
 
 
4.5

 
 
 
(0.1
)
 
 
 
48.6

 
Other
3.2

 
 
—

 
 
 
—

 
 
 
3.2

 
 
 
2.4

 
 
 
—

 
 
 
—

 
 
 
2.4

 
Total
$
130.4

 
 
$
26.0

 
 
 
$
(1.7
)
 
 
 
$
154.7

 
 
 
$
123.1

 
 
 
$
16.8

 
 
 
$
(4.6
)
 
 
 
$
135.3

 
Gains and losses from the sale of securities by the nuclear decommissioning trust fund
The costs of securities sold are determined on the basis of specific identification.  The following table summarizes the realized gains and losses from the sale of securities in the nuclear decommissioning trust fund.
 
2012
 
2011
 
2010
 
(millions)
Realized gains
$
1.7

 
$
1.0

 
$
7.3

Realized losses
(0.7
)
 
(0.7
)
 
(0.6
)
Nuclear Plant Decommissioning Costs
 
 
Total Station
 
KCP&L's 47% Share
 
 
(millions)
Current cost of decommissioning (in 2011 dollars)
 
 
$
630

 
 
 
$
296

 
Future cost of decommissioning (in 2045-2053 dollars) (a)
 
 
1,788

 
 
 
840

 
 
 
 
 
 
 
 
 
 
Annual escalation factor
 
2.85%
Annual return on trust assets (b)
 
5.46%
(a) Total future cost over an eight year decommissioning period
(b) The 5.46% rate of return is through 2025. The rate then systematically decreases through 2053 to 0.76% based on the assumption that the fund's investment mix will become increasingly conservative as the decommissioning period approaches.