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SEGMENT INFORMATION (Tables)
 6 Months Ended
Jun. 30, 2011
Segment Reporting Information Line Items  
Schedule Of Segment Reporting Information By Segment Text Block
  For the Three Months Ended June 30, 2011
  Regulated Companies         
  Distribution            
(Millions of Dollars)Electric Natural Gas Transmission Other Eliminations Total
Operating Revenues$ 794.4 $ 78.4 $ 152.1 $ 130.8 $ (108.2) $ 1,047.5
Depreciation and Amortization  (76.8)   (6.3)   (21.4)   (3.9)   0.4   (108.0)
Other Operating Expenses  (632.9)   (65.7)   (44.2)   (126.8)   108.2   (761.4)
Operating Income  84.7   6.4   86.5   0.1   0.4   178.1
Interest Expense  (31.0)   (5.2)   (19.1)   (8.5)   1.6   (62.2)
Interest Income  0.6   -   0.1   1.5   (1.5)   0.7
Other Income, Net  2.8   0.4   3.3   85.4   (85.3)   6.6
Income Tax (Expense)/Benefit  (17.2)   (0.4)   (28.0)   2.0   (0.9)   (44.5)
Net Income  39.9   1.2   42.8   80.5   (85.7)   78.7
Net Income Attributable                  
 to Noncontrolling Interests  (0.8)   -   (0.6)   -   -   (1.4)
Net Income Attributable                  
 to Controlling Interests$ 39.1 $ 1.2 $ 42.2 $ 80.5 $ (85.7) $ 77.3

  For the Six Months Ended June 30, 2011
  Regulated Companies         
  Distribution            
(Millions of Dollars)Electric Natural Gas Transmission Other Eliminations Total
Operating Revenues$ 1,686.0 $ 258.6 $ 310.3 $ 261.2 $ (233.4) $ 2,282.7
Depreciation and Amortization  (168.7)   (13.1)   (44.8)   (8.3)   1.3   (233.6)
Other Operating Expenses  (1,325.1)   (199.2)   (92.5)   (261.7)   234.9   (1,643.6)
Operating Income/(Loss)  192.2   46.3   173.0   (8.8)   2.8   405.5
Interest Expense  (60.6)   (10.4)   (35.4)   (17.1)   2.7   (120.8)
Interest Income  1.9   -   0.3   2.7   (2.8)   2.1
Other Income, Net  6.6   0.8   8.1   234.9   (234.8)   15.6
Income Tax (Expense)/Benefit  (43.6)   (13.0)   (57.9)   7.8   (1.4)   (108.1)
Net Income  96.5   23.7   88.1   219.5   (233.5)   194.3
Net Income Attributable                  
 to Noncontrolling Interests  (1.7)   -   (1.2)   -   -   (2.9)
Net Income Attributable                  
 to Controlling Interests$ 94.8 $ 23.7 $ 86.9 $ 219.5 $ (233.5) $ 191.4
Total Assets (as of)$ 8,836.0 $ 1,445.1 $ 3,551.4 $ 6,208.6 $ (5,598.8) $ 14,442.3
Cash Flows for Total                  
 Investments in Plant$ 251.1 $ 45.4 $ 146.0 $ 26.0 $ - $ 468.5

  For the Three Months Ended June 30, 2010
  Regulated Companies         
  Distribution            
(Millions of Dollars)Electric Natural Gas Transmission Other Eliminations Total
Operating Revenues$ 884.5 $ 73.5 $ 154.2 $ 133.8 $ (134.6) $ 1,111.4
Depreciation and Amortization  (111.6)   (7.0)   (21.6)   (3.5)   0.7   (143.0)
Other Operating Expenses  (696.3)   (62.0)   (45.4)   (117.1)   130.7   (790.1)
Operating Income  76.6   4.5   87.2   13.2   (3.2)   178.3
Interest Expense  (35.7)   (5.5)   (19.1)   (8.1)   1.2   (67.2)
Interest Income/(Loss)  (1.5)   -   1.2   1.4   (2.3)   (1.2)
Other Income/(Loss), Net  (0.5)   0.1   1.5   72.1   (70.4)   2.8
Income Tax (Expense)/Benefit  (10.5)   0.4   (28.3)   (1.0)   -   (39.4)
Net Income/(Loss)  28.4   (0.5)   42.5   77.6   (74.7)   73.3
Net Income Attributable                  
 to Noncontrolling Interests  (0.8)   -   (0.6)   -   -   (1.4)
Net Income/(Loss) Attributable                  
 to Controlling Interests$ 27.6 $ (0.5) $ 41.9 $ 77.6 $ (74.7) $ 71.9

  For the Six Months Ended June 30, 2010
  Regulated Companies         
  Distribution            
(Millions of Dollars)Electric Natural Gas Transmission Other Eliminations Total
Operating Revenues$ 1,884.5 $ 245.2 $ 307.9 $ 257.9 $ (244.7) $ 2,450.8
Depreciation and Amortization  (214.7)   (10.6)   (41.8)   (7.3)   1.6   (272.8)
Other Operating Expenses  (1,497.8)   (191.7)   (92.4)   (232.8)   241.7   (1,773.0)
Operating Income  172.0   42.9   173.7   17.8   (1.4)   405.0
Interest Expense  (72.2)   (10.4)   (38.5)   (15.7)   2.4   (134.4)
Interest Income/(Loss)  (0.8)   -   1.4   2.7   (3.7)   (0.4)
Other Income, Net  4.2   0.1   3.9   183.8   (182.0)   10.0
Income Tax Expense  (45.6)   (13.6)   (57.2)   (2.6)   (0.2)   (119.2)
Net Income  57.6   19.0   83.3   186.0   (184.9)   161.0
Net Income Attributable                  
 to Noncontrolling Interests  (1.6)   -   (1.2)   -   -   (2.8)
Net Income Attributable                  
 to Controlling Interests$ 56.0 $ 19.0 $ 82.1 $ 186.0 $ (184.9) $ 158.2
Total Assets (as of)$ 8,860.1 $ 1,370.8 $ 3,327.7 $ 6,043.9 $ (5,372.8) $ 14,229.7
Cash Flows for Total                  
 Investments in Plant$ 267.9 $ 28.0 $ 113.1 $ 33.4 $ - $ 442.4
The Connecticut Light and Power Company [Member]
  
Segment Reporting Information Line Items  
Schedule Of Segment Reporting Information By Segment Text Block
The information related to the distribution and transmission segments for CL&P, PSNH and WMECO for the three and six months
ended June 30, 2011 and 2010 is as follows:
                   
  CL&P - For the Three Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 489.9 $ 118.1 $ 608.0 $ 584.0 $ 123.9 $ 707.9
Depreciation and Amortization  (36.1)   (16.0)   (52.1)   (90.7)   (16.8)   (107.5)
Other Operating Expenses  (408.1)   (33.0)   (441.1)   (460.0)   (34.2)   (494.2)
Operating Income  45.7   69.1   114.8   33.3   72.9   106.2
Interest Expense  (18.5)   (15.8)   (34.3)   (21.5)   (15.7)   (37.2)
Interest Income  0.6   0.1   0.7   0.5   0.9   1.4
Other Income/(Loss), Net  (0.2)   1.5   1.3   (1.2)   0.5   (0.7)
Income Tax Expense   (7.8)   (22.1)   (29.9)   (1.9)   (23.7)   (25.6)
Net Income $ 19.8 $ 32.8 $ 52.6 $ 9.2 $ 34.9 $ 44.1

  CL&P - For the Six Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 1,039.8 $ 241.9 $ 1,281.7 $ 1,255.2 $ 247.7 $ 1,502.9
Depreciation and Amortization  (77.7)   (33.3)   (111.0)   (166.5)   (33.5)   (200.0)
Other Operating Expenses  (859.8)   (70.1)   (929.9)   (1,001.2)   (70.0)   (1,071.2)
Operating Income  102.3   138.5   240.8   87.5   144.2   231.7
Interest Expense  (35.0)   (29.1)   (64.1)   (43.9)   (31.8)   (75.7)
Interest Income  1.2   0.2   1.4   0.9   1.1   2.0
Other Income, Net  1.3   4.0   5.3   1.1   2.5   3.6
Income Tax Expense   (20.6)   (45.8)   (66.4)   (21.3)   (47.8)   (69.1)
Net Income $ 49.2 $ 67.8 $ 117.0 $ 24.3 $ 68.2 $ 92.5
Total Assets (as of)$ 5,601.3 $ 2,620.7 $ 8,222.0 $ 5,675.0 $ 2,552.7 $ 8,227.7
Cash Flows for Total                  
 Investments in Plant$ 141.9 $ 60.1 $ 202.0 $ 132.4 $ 59.3 $ 191.7
Public Service Company of New Hampshire [Member]
  
Segment Reporting Information Line Items  
Schedule Of Segment Reporting Information By Segment Text Block
  PSNH - For the Three Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 219.1 $ 21.1 $ 240.2 $ 218.2 $ 20.1 $ 238.3
Depreciation and Amortization  (30.8)   (2.8)   (33.6)   (14.0)   (2.6)   (16.6)
Other Operating Expenses  (160.8)   (7.9)   (168.7)   (170.0)   (8.3)   (178.3)
Operating Income  27.5   10.4   37.9   34.2   9.2   43.4
Interest Expense  (8.5)   (1.9)   (10.4)   (9.9)   (2.1)   (12.0)
Interest Income/(Loss)  -   -   -   (2.2)   0.2   (2.0)
Other Income, Net  3.9   0.5   4.4   1.6   0.2   1.8
Income Tax Expense   (6.9)   (3.3)   (10.2)   (6.8)   (2.8)   (9.6)
Net Income $ 16.0 $ 5.7 $ 21.7 $ 16.9 $ 4.7 $ 21.6

  PSNH - For the Six Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 467.0 $ 42.7 $ 509.7 $ 457.1 $ 39.8 $ 496.9
Depreciation and Amortization  (74.6)   (5.6)   (80.2)   (34.0)   (5.3)   (39.3)
Other Operating Expenses  (328.7)   (15.9)   (344.6)   (358.5)   (15.8)   (374.3)
Operating Income  63.7   21.2   84.9   64.6   18.7   83.3
Interest Expense  (17.1)   (3.8)   (20.9)   (20.2)   (4.2)   (24.4)
Interest Income/(Loss)  0.4   0.1   0.5   (1.9)   0.1   (1.8)
Other Income, Net  7.3   1.0   8.3   3.5   0.5   4.0
Income Tax Expense   (16.8)   (6.9)   (23.7)   (17.9)   (5.8)   (23.7)
Net Income $ 37.5 $ 11.6 $ 49.1 $ 28.1 $ 9.3 $ 37.4
Total Assets (as of)$ 2,377.2 $ 507.3 $ 2,884.5 $ 2,316.2 $ 475.6 $ 2,791.8
Cash Flows for Total                 
 Investments in Plant$ 89.7 $ 21.8 $ 111.5 $ 122.8 $ 18.9 $ 141.7
Western Massachusetts Electric Company [Member]
  
Segment Reporting Information Line Items  
Schedule Of Segment Reporting Information By Segment Text Block
  WMECO - For the Three Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 85.4 $ 13.0 $ 98.4 $ 82.3 $ 10.2 $ 92.5
Depreciation and Amortization  (9.9)   (2.6)   (12.5)   (6.9)   (2.1)   (9.0)
Other Operating Expenses  (64.1)   (3.3)   (67.4)   (66.3)   (2.9)   (69.2)
Operating Income  11.4   7.1   18.5   9.1   5.2   14.3
Interest Expense  (4.1)   (1.4)   (5.5)   (4.4)   (1.3)   (5.7)
Interest Income  0.1   -   0.1   0.1   0.1   0.2
Other Income/(Loss), Net  (0.9)   1.1   0.2   (0.8)   0.7   (0.1)
Income Tax Expense   (2.5)   (2.6)   (5.1)   (1.7)   (1.8)   (3.5)
Net Income $ 4.0 $ 4.2 $ 8.2 $ 2.3 $ 2.9 $ 5.2

  WMECO - For the Six Months Ended
  June 30, 2011 June 30, 2010
(Millions of Dollars)Distribution Transmission Total Distribution Transmission Total
Operating Revenues$ 179.3 $ 25.8 $ 205.1 $ 172.3 $ 20.4 $ 192.7
Depreciation and Amortization  (16.5)   (5.9)   (22.4)   (14.3)   (3.0)   (17.3)
Other Operating Expenses  (136.7)   (6.5)   (143.2)   (138.1)   (6.6)   (144.7)
Operating Income  26.1   13.4   39.5   19.9   10.8   30.7
Interest Expense  (8.5)   (2.5)   (11.0)   (8.1)   (2.5)   (10.6)
Interest Income  0.1   -   0.1   0.2   0.2   0.4
Other Income/(Loss), Net  (1.9)   2.7   0.8   (0.4)   0.8   0.4
Income Tax Expense   (6.1)   (5.2)   (11.3)   (6.4)   (3.6)   (10.0)
Net Income $ 9.7 $ 8.4 $ 18.1 $ 5.2 $ 5.7 $ 10.9
Total Assets (as of)$ 863.6 $ 402.3 $ 1,265.9 $ 874.2 $ 290.2 $ 1,164.4
Cash Flows for Total                 
 Investments in Plant$ 19.5 $ 57.4 $ 76.9 $12.8 $33.6 $ 46.4