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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION
9 Months Ended
Sep. 30, 2013
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Public Utility Property, Plant, and Equipment [Text Block]

3.       PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

 

The following tables summarize the NU, CL&P, NSTAR Electric, PSNH and WMECO investments in utility property, plant and equipment by asset category:

 

 As of September 30, 2013 As of December 31, 2012
(Millions of Dollars)NU NU
Distribution - Electric$ 11,735.4 $ 11,438.2
Distribution - Natural Gas  2,352.4   2,274.2
Transmission  6,009.0   5,541.1
Generation  1,142.1   1,146.6
Electric and Natural Gas Utility  21,238.9   20,400.1
Other (1)  505.2   429.3
Property, Plant and Equipment, Gross  21,744.1   20,829.4
Less: Accumulated Depreciation     
 Electric and Natural Gas Utility   (5,331.0)   (5,065.1)
 Other  (192.9)   (171.5)
Total Accumulated Depreciation  (5,523.9)   (5,236.6)
Property, Plant and Equipment, Net  16,220.2   15,592.8
Construction Work in Progress  967.7   1,012.2
Total Property, Plant and Equipment, Net$ 17,187.9 $ 16,605.0

(1)       These assets represent unregulated property and are primarily comprised of building improvements at RRR, software, hardware and equipment at NUSCO and telecommunications assets at NSTAR Communications, Inc.

 As of September 30, 2013 As of December 31, 2012
    NSTAR          NSTAR      
(Millions of Dollars)CL&P Electric PSNH WMECO CL&P Electric PSNH WMECO
Distribution$ 4,836.1 $ 4,622.7 $ 1,569.7 $ 746.3 $ 4,691.3 $ 4,539.9 $ 1,520.1 $ 724.2
Transmission  2,969.6   1,664.5   613.2   715.8   2,796.1   1,529.7   599.2   583.7
Generation  -   -   1,121.0   21.1   -   -   1,125.5   21.1
Property, Plant and                        
Equipment, Gross  7,805.7   6,287.2   3,303.9   1,483.2   7,487.4   6,069.6   3,244.8   1,329.0
Less: Accumulated Depreciation  (1,778.7)   (1,634.5)   (1,001.7)   (265.7)   (1,698.1)   (1,540.1)   (954.0)   (252.1)
Property, Plant and Equipment, Net  6,027.0   4,652.7   2,302.2   1,217.5   5,789.3   4,529.5   2,290.8   1,076.9
Construction Work in Progress  299.2   270.7   106.8   135.2   363.7   205.8   61.7   213.6
Total Property, Plant and                        
Equipment, Net$ 6,326.2 $ 4,923.4 $ 2,409.0 $ 1,352.7 $ 6,153.0 $ 4,735.3 $ 2,352.5 $ 1,290.5