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Fair Value of Financial Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Financial Assets and Liabilities [Abstract]  
Cost and Fair Value of Nuclear Decommissioning Fund Investments
The following tables present the cost and fair value of Xcel Energy's non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund at June 30, 2012 and Dec. 31, 2011:

   
June 30, 2012
 
      
Fair Value
    
                 
(Thousands of Dollars)
 
Cost
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Nuclear decommissioning fund (a)
               
Cash equivalents
 $24,913  $15,082  $9,831  $-  $24,913 
Commingled funds
  375,222   -   372,487   -   372,487 
International equity funds
  65,712   -   62,469   -   62,469 
Private equity investments
  22,593   -   -   23,303   23,303 
Real estate
  28,536   -   -   32,721   32,721 
Debt securities:
                    
Government securities
  118,378   -   119,376   -   119,376 
U.S. corporate bonds
  151,444   -   159,834   -   159,834 
International corporate bonds
  22,782   -   23,709   -   23,709 
Municipal bonds
  66,769   -   70,608   -   70,608 
Asset-backed securities
  7,057   -   -   7,068   7,068 
Mortgage-backed securities
  63,526   -   -   66,321   66,321 
Equity securities:
                    
Common stock
  407,384   424,703   -   -   424,703 
Total
 $1,354,316  $439,785  $818,314  $129,413  $1,387,512 

(a)
Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $100.3 million of equity investments in unconsolidated subsidiaries and $34.4 million of miscellaneous investments.

   
Dec. 31, 2011
 
      
Fair Value
    
                 
(Thousands of Dollars)
 
Cost
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Nuclear decommissioning fund (a)
               
Cash equivalents
 $26,123  $7,103  $19,020  $-  $26,123 
Commingled funds
  320,798   -   311,105   -   311,105 
International equity funds
  63,781   -   58,508   -   58,508 
Private equity investments
  9,203   -   -   9,203   9,203 
Real estate
  24,768   -   -   26,395   26,395 
Debt securities:
                    
Government securities
  116,490   -   117,256   -   117,256 
U.S. corporate bonds
  187,083   -   193,516   -   193,516 
International corporate bonds
  35,198   -   35,804   -   35,804 
Municipal bonds
  60,469   -   64,731   -   64,731 
Asset-backed securities
  16,516   -   -   16,501   16,501 
Mortgage-backed securities
  75,627   -   -   78,664   78,664 
Equity securities:
                    
Common stock
  408,122   398,625   -   -   398,625 
Total
 $1,344,178  $405,728  $799,940  $130,763  $1,336,431 

(a)
Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $92.7 million of equity investments in unconsolidated subsidiaries and $34.3 million of miscellaneous investments.
Changes in Level 3 Nuclear Decommissioning Fund Assets
The following tables present the changes in Level 3 nuclear decommissioning fund investments for the three and six months ended June 30, 2012 and 2011:

(Thousands of Dollars)
 
April 1, 2012
  
Purchases
  
Settlements
  
Gains (Losses)
Recognized as
Regulatory Assets
and Liabilities
  
June 30, 2012
 
Private equity investments
 $20,068  $3,235  $-  $-  $23,303 
Real estate
  27,905   2,271   -   2,545   32,721 
Asset-backed securities
  16,547   -   (9,458)  (21)  7,068 
Mortgage-backed securities
  68,671   7,414   (9,690)  (74)  66,321 
Total
 $133,191  $12,920  $(19,148) $2,450  $129,413 
 
(Thousands of Dollars)
 
April 1, 2011
  
Purchases
  
Settlements
  
Gains (Losses)
Recognized as
Regulatory Assets
and Liabilities
  
June 30, 2011
 
Asset-backed securities
 $26,020  $-  $(5,206)  $190  $21,004 
Mortgage-backed securities
  98,367   52,952   (88,584)   (464)  62,271 
Total
 $124,387  $52,952  $(93,790) $(274) $83,275 
 
(Thousands of Dollars)
 
Jan. 1, 2012
  
Purchases
  
Settlements
  
Gains (Losses)
Recognized as
Regulatory Assets
and Liabilities
  
June 30, 2012
 
Private equity investments
 $9,203  $13,390  $-  $710  $23,303 
Real estate
  26,395   3,907   (1,766)  4,185   32,721 
Asset-backed securities
  16,501   -   (9,459)  26   7,068 
Mortgage-backed securities
  78,664   14,318   (26,418)  (243)  66,321 
Total
 $130,763  $31,615  $(37,643) $4,678  $129,413 
 
(Thousands of Dollars)
 
Jan. 1, 2011
  
Purchases
  
Settlements
  
Gains (Losses)
Recognized as
Regulatory Assets
and Liabilities
  
June 30, 2011
 
Asset-backed securities
 $33,174  $756  $(13,116) $190  $21,004 
Mortgage-backed securities
  72,589   99,065   (108,457)  (926)  62,271 
Total
 $105,763  $99,821  $(121,573) $(736) $83,275 
Final Contractual Maturity Dates of Debt Securities in the Nuclear Decommissioning Fund by Asset Class
The following table summarizes the final contractual maturity dates of the debt securities in the nuclear decommissioning fund, by asset class at June 30, 2012:
 
   
Final Contractual Maturity
 
 
(Thousands of Dollars)
 
Due in 1 Year
or Less
  
Due in 1 to 5
Years
  
Due in 5 to 10
Years
  
Due after 10
Years
  
Total
 
Government securities
 $104,694  $79  $3,648  $10,955  $119,376 
U.S. corporate bonds
  -   40,032   103,834   15,968   159,834 
International corporate bonds
  -   6,481   17,228   -   23,709 
Municipal bonds
  -   -   27,692   42,916   70,608 
Asset-backed securities
  -   4,983   2,085   -   7,068 
Mortgage-backed securities
  -   -   877   65,444   66,321 
Debt securities
 $104,694  $51,575  $155,364  $135,283  $446,916 
Gross Notional Amounts of Commodity Forwards, Options, and FTRs
The following table details the gross notional amounts of commodity forwards, options and FTRs at June 30, 2012 and Dec. 31, 2011:

(Amounts in Thousands) (a)(b)
 
June 30, 2012
 
Dec. 31, 2011
 
Megawatt hours (MWh) of electricity
   
61,499
 
38,822
 
MMBtu of natural gas
   
8,252
 
40,736
 
Gallons of vehicle fuel
   
500
 
600
 
 
(a)
Amounts are not reflective of net positions in the underlying commodities.
(b)
Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.
Impact of Derivative Activity on OCI, Regulatory Assets and Liabilities, and Income
The following tables detail the impact of derivative activity during the three and six months ended June 30, 2012 and June 30, 2011, on OCI, regulatory assets and liabilities, and income:

   
Three Months Ended June 30, 2012
 
   
Fair Value Gains (Losses)
  
Pre-Tax (Gains) Losses Reclassified
    
   
Recognized During the Period in:
  
into Income During the Period from:
    
   
Accumulated
     
Accumulated
     
Pre-Tax Gains
 
   
Other
  
Regulatory
  
Other
  
Regulatory
  
Recognized
 
   
Comprehensive
  
(Assets) and
  
Comprehensive
  
Assets and
  
During the Period
 
(Thousands of Dollars)
 
Loss
  
Liabilities
  
Loss
  
(Liabilities)
  
in Income
 
Derivatives designated as cash flow hedges
               
Interest rate
 $(58,695) $-  $389  (a) $-  $- 
Vehicle fuel and other commodity
  (196)  -   (49)(e)  -   - 
Total
 $(58,891) $-  $340  $-  $- 
                      
Other derivative instruments
                    
Trading commodity
 $-  $-  $-  $-  $1,589(b)
Electric commodity
  -   38,174   -    (9,713)(c)  - 
Natural gas commodity
  -   885   -   -   - 
Total
 $-  $39,059  $-  $(9,713) $1,589 

   
Six Months Ended June 30, 2012
 
   
Fair Value Gains (Losses)
  
Pre-Tax (Gains) Losses Reclassified
    
   
Recognized During the Period in:
  
into Income During the Period from:
    
   
Accumulated
     
Accumulated
     
Pre-Tax Gains
 
   
Other
  
Regulatory
  
Other
  
Regulatory
  
(Losses) Recognized
 
   
Comprehensive
  
(Assets) and
  
Comprehensive
  
Assets and
  
During the Period
 
(Thousands of Dollars)
 
Loss
  
Liabilities
  
Loss
  
(Liabilities)
  
in Income
 
Derivatives designated as cash flow hedges
               
Interest rate
 $(16,991) $-  $777  (a) $-  $- 
Vehicle fuel and other commodity
  (17)  -   (100)(e)  -   - 
Total
 $(17,008) $-  $677  $-  $- 
                      
Other derivative instruments
                    
Trading commodity
 $-  $-  $-  $-  $3,312  (b)
Electric commodity
  -   39,756   -   (17,685)(c)  - 
Natural gas commodity
  -   (9,898)  -   80,939  (d)  (109)(b)
Total
 $-  $29,858  $-  $63,254  $3,203 
 
 
   
Three Months Ended June 30, 2011
 
   
Fair Value Gains (Losses)
  
Pre-Tax (Gains) Losses Reclassified
    
   
Recognized During the Period in:
  
into Income During the Period from:
    
   
Accumulated
     
Accumulated
     
Pre-Tax Gains
 
   
Other
  
Regulatory
  
Other
  
Regulatory
  
Recognized
 
   
Comprehensive
  
(Assets) and
  
Comprehensive
  
Assets and
  
During the Period
 
(Thousands of Dollars)
 
Loss
  
Liabilities
  
Loss
  
(Liabilities)
  
in Income
 
Derivatives designated as cash flow hedges
               
Interest rate
 $-  $-  $340  (a) $-  $- 
Vehicle fuel and other commodity
  (78)  -   (52)(e)  -   - 
Total
 $(78) $-  $288  $-  $- 
                      
Other derivative instruments
                    
Trading commodity
 $-  $-  $-  $-  $1,170  (b)
Electric commodity
  -   10,299   -   (8,666)(c)  - 
Natural gas commodity
  -   (9,564)  -   738   (d)  - 
Total
 $-  $735  $-  $(7,928) $1,170 

   
Six Months Ended June 30, 2011
 
   
Fair Value Gains (Losses)
  
Pre-Tax (Gains) Losses Reclassified
    
   
Recognized During the Period in:
  
into Income During the Period from:
    
   
Accumulated
     
Accumulated
     
Pre-Tax Gains
 
   
Other
  
Regulatory
  
Other
  
Regulatory
  
Recognized
 
   
Comprehensive
  
(Assets) and
  
Comprehensive
  
Assets and
  
During the Period
 
(Thousands of Dollars)
 
Loss
  
Liabilities
  
Loss
  
(Liabilities)
  
in Income
 
Derivatives designated as cash flow hedges
               
Interest rate
 $-  $-  $677  (a) $-  $- 
Vehicle fuel and other commodity
  311   -   (84)(e)  -   - 
Total
 $311  $-  $593  $-  $- 
                      
Other derivative instruments
                    
Trading commodity
 $-  $-  $-  $-  $6,770  (b)
Electric commodity
  -   19,145   -   (17,554)(c)  - 
Natural gas commodity
  -   (17,179)  -   58,125   (d)  - 
Total
 $-  $1,966  $-  $40,571  $6,770 

(a)
Recorded to interest charges.
(b)
Recorded to electric operating revenues.  Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.
(c)
Recorded to electric fuel and purchased power.  These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.
(d)
Recorded to cost of natural gas sold and transported.  These derivative settlement gains and losses are shared with natural gas customers through purchased natural gas cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.
(e)
Recorded to operating and maintenance (O&M) expenses.
Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis by Hierarchy Level
The following tables present for each of the hierarchy levels, Xcel Energy's derivative assets and liabilities that are measured at fair value on a recurring basis at June 30, 2012:

   
June 30, 2012
 
   
Fair Value
          
            
Fair Value
  
Counterparty
    
(Thousands of Dollars)
 
Level 1
  
Level 2
  
Level 3
  
Total
  
Netting (b)
  
Total
 
Current derivative assets
                  
Derivatives designated as cash flow hedges:
                  
Vehicle fuel and other commodity
 $-  $89  $-  $89  $-  $89 
Other derivative instruments:
                        
Trading commodity
  79   31,891   -   31,970   (11,065)  20,905 
Electric commodity
  -   -   35,664   35,664   (1,875)  33,789 
Natural gas commodity
  -   924   -   924   (56)  868 
Total current derivative assets
 $79  $32,904  $35,664  $68,647  $(12,996)  55,651 
Purchased power agreements (a)
                      32,717 
Current derivative instruments
                     $88,368 
Noncurrent derivative assets
                        
Derivatives designated as cash flow hedges:
                        
Vehicle fuel and other commodity
 $-  $57  $-  $57  $(31) $26 
Other derivative instruments:
                        
Trading commodity
  -   36,106   -   36,106   (4,538)  31,568 
Total noncurrent derivative assets
 $-  $36,163  $-  $36,163  $(4,569)  31,594 
Purchased power agreements (a)
                      105,421 
Noncurrent derivative instruments
                     $137,015 
 
 
   
June 30, 2012
 
   
Fair Value
          
            
Fair Value
  
Counterparty
    
(Thousands of Dollars)
 
Level 1
  
Level 2
  
Level 3
  
Total
  
Netting (b)
  
Total
 
Current derivative liabilities
                  
Derivatives designated as cash flow hedges:
                  
Interest rate
 $-  $74,740  $-  $74,740  $-  $74,740 
Other derivative instruments:
                        
Trading commodity
  112   25,877   -   25,989   (11,773)  14,216 
Electric commodity
  -   -   1,875   1,875   (1,875)  - 
Natural gas commodity
  -   38   -   38   (38)  - 
Total current derivative liabilities
 $112  $100,655  $1,875  $102,642  $(13,686)  88,956 
Purchased power agreements (a)
                      22,880 
Current derivative instruments
                     $111,836 
Noncurrent derivative liabilities
                        
Other derivative instruments:
                        
Trading commodity
 $-  $20,834  $-  $20,834  $(4,570) $16,264 
Total noncurrent derivative liabilities
 $-  $20,834  $-  $20,834  $(4,570)  16,264 
Purchased power agreements (a)
                      237,100 
Noncurrent derivative instruments
                     $253,364 
 
 (a)
In 2003, as a result of implementing new guidance on the normal purchase exception for derivative accounting, Xcel Energy began recording several long-term purchased power agreements at fair value due to accounting requirements related to underlying price adjustments.  As these purchases are recovered through normal regulatory recovery mechanisms in the respective jurisdictions, the changes in fair value for these contracts were offset by regulatory assets and liabilities.  During 2006, Xcel Energy qualified these contracts under the normal purchase exception.  Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
(b)
The accounting guidance for derivatives and hedging permits the netting of receivables and payables for derivatives and related collateral amounts when a legally enforceable master netting agreement exists between Xcel Energy and a counterparty.  A master netting agreement is an agreement between two parties who have multiple contracts with each other that provides for the net settlement of all contracts in the event of default on or termination of any one contract.

The following tables present for each of the hierarchy levels, Xcel Energy's derivative assets and liabilities that are measured at fair value on a recurring basis at Dec. 31, 2011:

   
Dec. 31, 2011
 
   
Fair Value
          
            
Fair Value
  
Counterparty
    
(Thousands of Dollars)
 
Level 1
  
Level 2
  
Level 3
  
Total
  
Netting (b)
  
Total
 
Current derivative assets
                  
Derivatives designated as cash flow hedges:
                  
Vehicle fuel and other commodity
 $-  $169  $-  $169  $(76) $93 
Other derivative instruments:
                        
Trading commodity
  -   32,682   -   32,682   (13,391)  19,291 
Electric commodity
  -   -   13,333   13,333   (1,471)  11,862 
Total current derivative assets
 $-  $32,851  $13,333  $46,184  $(14,938)  31,246 
Purchased power agreements (a)
                      33,094 
Current derivative instruments
                     $64,340 
Noncurrent derivative assets
                        
Derivatives designated as cash flow hedges:
                        
Vehicle fuel and other commodity
 $-  $107  $-  $107  $(59) $48 
Other derivative instruments:
                        
Trading commodity
  -   36,599   -   36,599   (5,540)  31,059 
Total noncurrent derivative assets
 $-  $36,706  $-  $36,706  $(5,599)  31,107 
Purchased power agreements (a)
                      121,780 
Noncurrent derivative instruments
                     $152,887 

   
Dec. 31, 2011
 
   
Fair Value
          
            
Fair Value
  
Counterparty
    
(Thousands of Dollars)
 
Level 1
  
Level 2
  
Level 3
  
Total
  
Netting (b)
  
Total
 
Current derivative liabilities
                  
Derivatives designated as cash flow hedges:
                  
Interest rate
 $-  $57,749  $-  $57,749  $-  $57,749 
Other derivative instruments:
                        
Trading commodity
  -   27,891   -   27,891   (14,417)  13,474 
Electric commodity
  -   698   916   1,614   (1,471)  143 
Natural gas commodity
  418   70,119   -   70,537   (7,486)  63,051 
Total current derivative liabilities
 $418  $156,457  $916  $157,791  $(23,374)  134,417 
Purchased power agreements (a)
                      22,997 
Current derivative instruments
                     $157,414 
Noncurrent derivative liabilities
                        
Other derivative instruments:
                        
Trading commodity
 $-  $20,966  $-  $20,966  $(5,599) $15,367 
Total noncurrent derivative liabilities
 $-  $20,966  $-  $20,966  $(5,599)  15,367 
Purchased power agreements (a)
                      248,539 
Noncurrent derivative instruments
                     $263,906 

(a)
In 2003, as a result of implementing new guidance on the normal purchase exception for derivative accounting, Xcel Energy began recording several long-term purchased power agreements at fair value due to accounting requirements related to underlying price adjustments.  As these purchases are recovered through normal regulatory recovery mechanisms in the respective jurisdictions, the changes in fair value for these contracts were offset by regulatory assets and liabilities.  During 2006, Xcel Energy qualified these contracts under the normal purchase exception.  Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
(b)
The accounting guidance for derivatives and hedging permits the netting of receivables and payables for derivatives and related collateral amounts when a legally enforceable master netting agreement exists between Xcel Energy and a counterparty.  A master netting agreement is an agreement between two parties who have multiple contracts with each other that provides for the net settlement of all contracts in the event of default on or termination of any one contract.
Changes in Level 3 Commodity Derivatives
The following table presents the changes in Level 3 commodity derivatives for the three and six months ended June 30, 2012 and 2011:

   
Three Months Ended June 30
 
(Thousands of Dollars)
 
2012
  
2011
 
Balance at April 1
 $5,324  $2,332 
Purchases
  37,296   33,609 
Settlements
  (12,675)  (8,211)
Net transactions recorded during the period:
        
Gains recognized in earnings (a)
  -   4 
Gains (losses) recorded as regulatory assets and liabilities
  3,844   (23,738)
Balance at June 30
 $33,789  $3,996 
 
   
Six Months Ended June 30
 
(Thousands of Dollars)
 
2012
  
2011
 
Balance at Jan. 1
 $12,417  $2,392 
Purchases
  37,297   33,609 
Settlements
  (21,560)  (16,001)
Net transactions recorded during the period:
        
(Losses) gains recognized in earnings (a)
  (9)  72 
Gains (losses) recorded as regulatory assets and liabilities
  5,644   (16,076)
Balance at June 30
 $33,789  $3,996 

(a)
These amounts relate to commodity derivatives held at the end of the period.
Carrying Amount and Fair Value of Long-term Debt
As of June 30, 2012 and Dec. 31, 2011, other financial instruments for which the carrying amount did not equal fair value were as follows:

   
June 30, 2012
  
Dec. 31, 2011
 
   
Carrying
     
Carrying
    
(Thousands of Dollars)
 
Amount
  
Fair Value
  
Amount
  
Fair Value
 
Long-term debt, including current portion
 $10,017,997  $11,857,476  $9,908,435  $11,734,798