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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION
3 Months Ended
Mar. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Public Utility Property, Plant, and Equipment [Text Block]
##PPE.PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION 
         
The following tables summarize the NU, CL&P, PSNH and WMECO investments in utility property, plant and equipment:
         
 As of March 31, 2012 As of December 31, 2011 
(Millions of Dollars)NU NU 
Distribution - Electric$ 6,645.0 $ 6,540.4 
Distribution - Natural Gas  1,259.9   1,247.6 
Transmission  3,590.7   3,541.9 
Generation  1,132.0   1,096.0 
Electric and Natural Gas Utility  12,627.6   12,425.9 
Other (1)  308.4   305.1 
Total Property, Plant and Equipment, Gross  12,936.0   12,731.0 
Less: Accumulated Depreciation      
 Electric and Natural Gas Utility   (3,077.5)   (3,035.5) 
 Other  (122.5)   (120.2) 
Total Accumulated Depreciation  (3,200.0)   (3,155.7) 
Property, Plant and Equipment, Net  9,736.0   9,575.3 
Construction Work in Progress  877.2   827.8 
Total Property, Plant and Equipment, Net$ 10,613.2 $ 10,403.1 

(1)       These assets are primarily owned by RRR ($162.2 million and $161.5 million) and NUSCO ($134.1 million and $131.5 million) as of March 31, 2012 and December 31, 2011, respectively, and are mainly comprised of buildings and building improvements at RRR and software and equipment at NUSCO.

                  
 As of March 31, 2012 As of December 31, 2011
(Millions of Dollars)CL&P PSNH WMECO CL&P PSNH WMECO
Distribution$ 4,507.6 $ 1,464.5 $ 708.6 $ 4,419.6 $ 1,451.6 $ 704.3
Transmission  2,693.7   548.1   337.7   2,689.1   546.4   297.4
Generation  -   1,110.8   21.2   -   1,074.8   21.2
Total Property, Plant and Equipment, Gross  7,201.3   3,123.4   1,067.5   7,108.7   3,072.8   1,022.9
Less: Accumulated Depreciation  (1,618.7)   (905.4)   (243.3)   (1,596.7)   (893.6)   (240.5)
Property, Plant and Equipment, Net  5,582.6   2,218.0   824.2   5,512.0   2,179.2   782.4
Construction Work in Progress  325.8   70.0   328.8   315.4   77.5   295.4
Total Property, Plant and Equipment, Net$ 5,908.4 $ 2,288.0 $ 1,153.0 $ 5,827.4 $ 2,256.7 $ 1,077.8