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Fair Value Measurements
6 Months Ended
Jun. 30, 2012
Fair Value Measurements [Abstract]  
Fair Value Measurements
14.  
FAIR VALUE MEASUREMENTS

GAAP defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.  GAAP establishes a fair value hierarchy, which prioritizes the inputs to valuation techniques used to measure fair value into three broad categories, giving the highest priority to quoted prices in active markets for identical assets or liabilities and lowest priority to unobservable inputs.  A definition of the various levels, as well as discussion of the various measurements within the levels, is as follows:
 
Level 1 – Unadjusted quoted prices for identical assets or liabilities in active markets that Great Plains Energy and KCP&L have access to at the measurement date.  Assets and liabilities categorized within this level consist of Great Plains Energy’s and KCP&L’s various exchange traded derivative instruments and equity and U.S. Treasury securities that are actively traded within KCP&L’s decommissioning trust fund and GMO’s Supplemental Executive Retirement Plan (SERP) rabbi trust fund.
 
Level 2 – Market-based inputs for assets or liabilities that are observable (either directly or indirectly) or inputs that are not observable but are corroborated by market data.  Assets categorized within this level consist of Great Plains Energy’s and KCP&L’s various non-exchange traded derivative instruments traded in over-the-counter markets and certain debt securities within KCP&L’s decommissioning trust fund and GMO’s SERP rabbi trust fund.
 
Level 3 – Unobservable inputs, reflecting Great Plains Energy’s and KCP&L’s own assumptions about the assumptions market participants would use in pricing the asset or liability.  Assets categorized within this level consist of Great Plains Energy’s various non-exchange traded derivative instruments traded in over-the-counter markets for which sufficiently observable market data is not available to corroborate the valuation inputs.
 
The following tables include Great Plains Energy’s and KCP&L’s balances of financial assets and liabilities measured at fair value on a recurring basis at June 30, 2012, and December 31, 2011.
            
      
Fair Value Measurements Using
      
 
 
Description
 
 
 June 30
2012
 
 
Netting(d)
Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
KCP&L
(millions)
Assets
          
Nuclear decommissioning trust (b)
          
Equity securities
$91.3 $- $91.3 $- $- 
Debt securities
               
U.S. Treasury
 16.2  -  16.2  -  - 
U.S. Agency
 4.3  -  -  4.3  - 
State and local obligations
 2.7  -  -  2.7  - 
Corporate bonds
 26.9  -  -  26.9  - 
Foreign governments
 0.7  -  -  0.7  - 
Other
 0.5  -  -  0.5  - 
Total nuclear decommissioning trust
 142.6  -  107.5  35.1  - 
Total
 142.6  -  107.5  35.1  - 
Liabilities
               
Derivative instruments (a)
 -  (0.5) 0.5  -  - 
Total
$- $(0.5)$0.5 $- $- 
Other Great Plains Energy
               
Assets
               
Derivative instruments (a)
$6.7 $- $- $4.5 $2.2 
SERP rabbi trust (c)
               
Equity securities
 0.2  -  0.2  -  - 
Debt securities
 0.1  -  -  0.1  - 
Total SERP rabbi trust
 0.3  -  0.2  0.1  - 
Total
 7.0  -  0.2  4.6  2.2 
Liabilities
               
Derivative instruments (a)
 -  (3.0) 3.0  -  - 
Total
$- $(3.0)$3.0 $- $- 
Great Plains Energy
               
Assets
               
Derivative instruments (a)
$6.7 $- $- $4.5 $2.2 
Nuclear decommissioning trust (b)
 142.6  -  107.5  35.1  - 
SERP rabbi trust (c)
 0.3  -  0.2  0.1  - 
Total
 149.6  -  107.7  39.7  2.2 
Liabilities
               
Derivative instruments (a)
 -  (3.5) 3.5  -  - 
Total
$- $(3.5)$3.5 $- $- 
                 
 
            
      
Fair Value Measurements Using
      
Description
December 31
2011
Netting(d)
Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
KCP&L
(millions)
Assets
          
Nuclear decommissioning trust (b)
         
Equity securities
$84.3 $- $84.3 $- $- 
Debt securities
               
U.S. Treasury
 15.3  -  15.3  -  - 
U.S. Agency
 3.6  -  -  3.6  - 
State and local obligations
 2.6  -  -  2.6  - 
Corporate bonds
 26.4  -  -  26.4  - 
Foreign governments
 0.7  -  -  0.7  - 
Other
 (0.6) -  -  (0.6) - 
Total nuclear decommissioning trust
 132.3  -  99.6  32.7  - 
Total
 132.3  -  99.6  32.7  - 
Liabilities
               
Derivative instruments (a)
 -  (0.5) 0.5  -  - 
Total
$- $(0.5)$0.5 $- $- 
Other Great Plains Energy
               
Assets
               
Derivative instruments (a)
$7.8 $- $- $4.7 $3.1 
SERP rabbi trust (c)
               
Equity securities
 0.2  -  0.2  -  - 
Debt securities
 0.1  -  -  0.1  - 
Total SERP rabbi trust
 0.3  -  0.2  0.1  - 
Total
 8.1  -  0.2  4.8  3.1 
Liabilities
               
Derivative instruments (a)
 -  (5.0) 5.0  -  - 
Total
$- $(5.0)$5.0 $- $- 
Great Plains Energy
               
Assets
               
Derivative instruments (a)
$7.8 $- $- $4.7 $3.1 
Nuclear decommissioning trust (b)
 132.3  -  99.6  32.7  - 
SERP rabbi trust (c)
 0.3  -  0.2  0.1  - 
Total
 140.4  -  99.8  37.5  3.1 
Liabilities
               
Derivative instruments (a)
 -  (5.5) 5.5  -  - 
Total
$- $(5.5)$5.5 $- $- 
                 
(a)  
The fair value of derivative instruments is estimated using market quotes, over-the-counter forward price and volatility curves and correlations among fuel prices, net of estimated credit risk.
(b)  
Fair value is based on quoted market prices of the investments held by the fund and/or valuation models.  The total does not include $2.3 million and $3.0 million at June 30, 2012, and December 31, 2011, respectively, of cash and cash equivalents, which are not subject to the fair value requirements.
(c)  
Fair value is based on quoted market prices of the investments held by the fund and/or valuation models.  The total does not include $20.2 million and $20.3 million at June 30, 2012, and December 31, 2011, respectively, of cash and cash equivalents, which are not subject to the fair value requirements.
(d)  
Represents the difference between derivative contracts in an asset or liability position presented on a net basis by counterparty on the consolidated balance sheet where a master netting agreement exists between the Company and the counterparty.  At June 30, 2012, and December 31, 2011, Great Plains Energy netted $3.4 million and $5.5 million, respectively, of cash collateral posted with counterparties.

The following tables reconcile the beginning and ending balances for all Level 3 assets and liabilities, net measured at fair value on a recurring basis for the three months ended and year to date June 30, 2012 and 2011.
       
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
 
2012
 
2011
 
Derivative
 
Instruments
 
(millions)
Balance at April 1
$2.4  $5.7 
Total realized/unrealized gains
       
included in non-operating income
 0.9   2.1 
Settlements
 (1.1)  (2.9)
Balance at June 30
$2.2  $4.9 
         
Total unrealized gains and (losses) included in non-operating
     
income relating to assets and liabilities still on the
       
consolidated balance sheet at June 30
$(0.1) $(0.6)
         
       
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
 
2012
 
2011
 
Derivative
 
Instruments
 
(millions)
Balance at January 1
$3.1  $3.7 
Total realized/unrealized gains
       
included in non-operating income
 1.1   7.1 
Settlements
 (2.0)  (5.9)
Balance at June 30
$2.2  $4.9 
         
Total unrealized gains and (losses) included in non-operating
     
income relating to assets and liabilities still on the
       
consolidated balance sheet at June 30
$(0.7) $1.5