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DERIVATIVE INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block
  As of December 31, 2013
  Commodity Supply and   Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability)
Current Derivative Assets:        
Level 2:        
 Other (1)$ 1.9 $ (0.3) $ 1.6
Level 3:        
 CL&P (1)  17.1   (9.8)   7.3
 NSTAR Electric  1.2   -   1.2
 WMECO  0.1   -   0.1
Total Current Derivative Assets$ 20.3 $ (10.1) $ 10.2
          
Long-Term Derivative Assets:        
Level 2:        
 Other$ 0.2 $ - $ 0.2
Level 3:         
 CL&P (1)  113.6   (42.2)   71.4
 WMECO  2.6   -   2.6
Total Long-Term Derivative Assets$ 116.4 $ (42.2) $ 74.2
          
Current Derivative Liabilities:        
Level 3:        
 CL&P$ (92.2) $ - $ (92.2)
 NSTAR Electric  (1.5)   -   (1.5)
Total Current Derivative Liabilities$ (93.7) $ - $ (93.7)
          
Long-Term Derivative Liabilities:        
Level 3:        
 CL&P $ (617.1) $ - $ (617.1)
 NSTAR Electric  (7.0)   -   (7.0)
Total Long-Term Derivative Liabilities$ (624.1) $ - $ (624.1)

  As of December 31, 2012
  Commodity Supply and   Net Amount Recorded as
(Millions of Dollars)Price Risk Management Netting (1) Derivative Asset/(Liability)
Current Derivative Assets:        
Level 2:        
 Other$0.2 $0 $0.2
Level 3:        
 CL&P (1)  17.7   (12.0)   5.7
 Other  5.5   -   5.5
Total Current Derivative Assets$ 23.4 $ (12.0) $ 11.4
          
Long-Term Derivative Assets:        
Level 3:         
 CL&P (1)$ 159.7 $ (69.1) $ 90.6
Total Long-Term Derivative Assets$ 159.7 $ (69.1) $ 90.6
          
Current Derivative Liabilities:        
Level 2:        
 Other (1) (2)$ (19.9) $ 0.6 $ (19.3)
Level 3:        
 CL&P  (96.9)   -   (96.9)
 NSTAR Electric  (1.0)   -   (1.0)
Total Current Derivative Liabilities$ (117.8) $ 0.6 $ (117.2)
          
Long-Term Derivative Liabilities:        
Level 2:        
 Other$ (0.2) $ - $ (0.2)
Level 3:        
 CL&P   (865.6)   -   (865.6)
 NSTAR Electric  (13.9)   -   (13.9)
 WMECO  (3.0)   -   (3.0)
Total Long-Term Derivative Liabilities$ (882.7) $ - $ (882.7)
Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block
           
Location of Amounts  Amounts Recognized on Derivatives
Recognized on Derivatives  For the Years Ended December 31,
(Millions of Dollars)  2013 2012 2011
NU          
Balance Sheet:          
 Regulatory Assets and Liabilities  $ 160.6 $ (29.0) $ (162.0)
Statement of Income:          
 Purchased Power, Fuel and Transmission    1.0   (0.7)   0.5
Schedule Of Cash Flow Hedges Included In Accumulated Other Comprehensive Income Loss [Table Text Block]
Schedule Of Credit Risk Contingent Features [Table Text Block]
Fairvalueinputsliabilitiesquantitativeinformationtabletextblock
 As of December 31, 2013 As of December 31, 2012
  Range Period Covered  Range Period Covered
Energy Prices:                 
NU$49- 77per MWh 2018-2029 $43- 90 per MWh 2018 - 2028
CL&P$56- 58per MWh 2018-2029 $50- 55per MWh 2018 - 2020
WMECO$49- 77per MWh 2018-2029 $43- 90per MWh 2018 - 2028
                  
Capacity Prices:                 
NU$5.07- 11.82 per kW-Month 2017-2029 $1.40- 10.53 per kW-Month 2016 - 2028
CL&P$5.07- 10.42 per kW-Month 2017-2026 $1.40- 9.83 per kW-Month 2016 - 2026
NSTAR Electric$5.07- 7.38 per kW-Month 2017-2019 $1.40- 3.39 per kW-Month 2016 - 2019
WMECO$5.07- 11.82 per kW-Month 2017-2029 $1.40- 10.53 per kW-Month 2016 - 2028
                  
Forward Reserve:                 
NU, CL&P$3.30- 3.30 per kW-Month 2014-2024 $0.35- 0.90 per kW-Month 2013 - 2024
                  
REC Prices:                 
NU$36- 87 per REC 2014-2029 $25- 85 per REC 2013 - 2028
NSTAR Electric$36- 70 per REC 2014-2018 $25- 71 per REC 2013 - 2018
WMECO$36- 87 per REC 2014-2029 $25- 85 per REC 2013 - 2028
FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock
(Millions of Dollars)NU (1) CL&P NSTAR Electric WMECO
Derivatives, Net:            
Fair Value as of January 1, 2012$ (962.2) $ (931.6) $ (3.4) $ (7.3)
Liabilities Assumed due to Merger with NSTAR  (5.4)   -   -   -
Transfer to Level 2  32.2   -   -   -
Net Realized/Unrealized Gains/(Losses) Included in:           
 Net Income (2)  10.9   -   -   -
 Regulatory Assets and Liabilities  (29.2)   (21.6)   (15.2)   4.3
Settlements  75.1   87.0   3.7   -
Fair Value as of December 31, 2012$ (878.6) $ (866.2) $ (14.9) $ (3.0)
Net Realized/Unrealized Gains/(Losses) Included in:           
 Net Income (2)  10.9   -   -   -
 Regulatory Assets and Liabilities  158.3   148.9   3.5   5.7
Settlements  74.2   86.7   4.1   -
Fair Value as of December 31, 2013$ (635.2) $ (630.6) $ (7.3) $ 2.7