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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2013
Notes To Consolidated Financial Statements [Abstract]  
Fair Value By Balance Sheet Grouping Text Block
  As of March 31, 2013 As of December 31, 2012
  NU NU
  Carrying Fair  Carrying Fair
(Millions of Dollars) Amount Value Amount Value
Preferred Stock Not           
 Subject to Mandatory Redemption$ 155.6 $ 154.2 $ 155.6 $ 152.2
Long-Term Debt  7,958.9   8,634.1   7,963.5   8,640.7
Rate Reduction Bonds  19.6   19.7   82.1   83.0

  As of March 31, 2013
  CL&P NSTAR Electric PSNH WMECO
  Carrying Fair  Carrying Fair Carrying Fair Carrying Fair
(Millions of Dollars) Amount Value Amount Value Amount Value Amount Value
Preferred Stock Not                       
 Subject to Mandatory Redemption$ 116.2 $ 111.6 $ 43.0 $ 42.6 $ - $ - $ - $ -
Long-Term Debt  2,865.6   3,295.9   1,602.6   1,809.0   998.0   1,091.6   605.1   665.0
Rate Reduction Bonds  -   -   -   -   15.0   15.0   4.6   4.7
                         
  As of December 31, 2012
  CL&P NSTAR Electric  PSNH WMECO
  Carrying Fair  Carrying Fair Carrying Fair Carrying Fair
(Millions of Dollars) Amount Value Amount Value Amount Value Amount Value
Preferred Stock Not                       
 Subject to Mandatory Redemption$ 116.2 $ 110.0 $ 43.0 $ 42.2 $ - $ - $ - $ -
Long-Term Debt  2,862.8   3,295.4   1,602.6   1,818.8   997.9   1,088.0   605.3   660.4
Rate Reduction Bonds  -   -   43.5   43.9   29.3   29.6   9.4   9.5