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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION (Tables)
6 Months Ended
Jun. 30, 2011
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, PSNH, and WMECO investments in utility plant:
        
   As of June 30, 2011 As of December 31, 2010
(Millions of Dollars)NU NU
Distribution - Electric$6,350.2 $6,197.2
Distribution - Natural Gas 1,168.5  1,126.6
Transmission 3,407.1  3,378.0
Generation 720.6  697.1
Electric and Natural Gas Utility 11,646.4  11,398.9
Other (1) 304.4  305.5
Total Property, Plant and Equipment, Gross 11,950.8  11,704.4
Less: Accumulated Depreciation     
  Electric and Natural Gas Utility  (2,938.0)  (2,862.3)
  Other (119.3)  (119.9)
Total Accumulated Depreciation (3,057.3)  (2,982.2)
Property, Plant and Equipment, Net 8,893.5  8,722.2
Construction Work in Progress 970.3  845.5
Total Property, Plant and Equipment, Net$9,863.8 $9,567.7

(1)       These assets are primarily owned by RRR ($162.8 million and $166 million) and NUSCO ($129.7 million and $126.6 million) as of June 30, 2011 and December 31, 2010, respectively, and are mainly comprised of building improvements at RRR and software and equipment at NUSCO.

 As of June 30, 2011 As of December 31, 2010
(Millions of Dollars)CL&P PSNH WMECO CL&P PSNH WMECO
Distribution$ 4,293.6 $ 1,405.6 $ 684.8 $ 4,180.7 $ 1,375.4 $ 673.7
Transmission  2,649.2   497.0   260.9   2,668.4   476.1   233.5
Generation  -   711.1   9.5   -   687.7   9.4
Total Property, Plant and Equipment, Gross  6,942.8   2,613.7   955.2   6,849.1   2,539.2   916.6
Less: Accumulated Depreciation  (1,543.6)   (862.8)   (234.6)   (1,508.7)   (837.3)   (228.5)
Property, Plant and Equipment, Net  5,399.2   1,750.9   720.6   5,340.4   1,701.9   688.1
Construction Work in Progress  256.0   385.0   188.1   246.1   351.4   129.0
Total Property, Plant and Equipment, Net$ 5,655.2 $ 2,135.9 $ 908.7 $ 5,586.5 $ 2,053.3 $ 817.1

On May 31, 2011, CL&P completed the sale of a segment of high voltage transmission lines in the town of Wallingford, Connecticut. The net book value of the assets sold was $42.5 million. CL&P will operate and maintain the lines under an operations and maintenance agreement.