CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net Income	$ 194,303	$ 160,948
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	9,374	17,176
Depreciation	147,588	157,731
Deferred Income Taxes	95,293	37,850
Pension and PBOP Expense, Net of PBOP Contributions	51,324	25,529
Pension Contribution	(19,200)	0
Regulatory (Underrecoveries)/Overrecoveries, Net	40,434	21,569
Amortization of Regulatory Assets/(Liabilities), Net	51,669	566
Amortization of Rate Reduction Bonds	34,367	114,567
Changes in Derivative Assets and Liabilities	(9,272)	(5,640)
Other Adjustments	(7,192)	(29,707)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	80,696	34,703
Inventory	12,992	52,024
Taxes Receivable/(Accrued)	48,933	(3,856)
Change in Accounts Payable	(23,981)	(53,480)
Other Current Assets and Liabilities	(20,633)	3,799
Net Cash Flows Provided by Operating Activities	686,695	533,779
Investing Activities:
Investments in Property, Plant and Equipment	(468,526)	(442,404)
Proceeds from Sales of Marketable Securities	72,369	95,452
Purchases of Marketable Securities	(73,564)	(96,546)
Proceeds From Sale Of Property Plant And Equipment	46,841	0
Other Investing Activities	(4,828)	(4,369)
Net Cash Flows Used in Investing Activities	(427,708)	(447,867)
Financing Activities:
Cash Dividends on Common Stock	(97,207)	(90,194)
Cash Dividends on Preferred Stock	(2,779)	(2,779)
Increase/(Decrease) in Short-Term Debt	(130,000)	57,000
Issuance of Long-Term Debt	122,000	145,000
Retirements of Long-Term Debt	(124,086)	(4,286)
Retirements of Rate Reduction Bonds	(34,320)	(128,600)
Other Financing Activities	(883)	(230)
Net Cash Flows Provided by/(Used in) Financing Activities	(267,275)	(24,089)
Net Increase/(Decrease) in Cash	(8,288)	61,823
Cash - Beginning of Year	23,395	26,952
Cash - End of Year	15,107	88,775
The Connecticut Light and Power Company [Member]
Operating Activities:
Net Income	116,972	92,498
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	2,252	5,494
Depreciation	77,917	95,469
Deferred Income Taxes	60,425	11,624
Pension and PBOP Expense, Net of PBOP Contributions	9,868	3,602
Regulatory (Underrecoveries)/Overrecoveries, Net	24,142	30,459
Amortization of Regulatory Assets/(Liabilities), Net	33,049	22,311
Amortization of Rate Reduction Bonds	0	82,207
Other Adjustments	(17,752)	(29,444)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	34,192	15,679
Inventory	(11,761)	4,767
Taxes Receivable/(Accrued)	31,797	12,694
Change in Accounts Payable	(12,078)	(38,735)
Other Current Assets and Liabilities	9,968	22,341
Net Cash Flows Provided by Operating Activities	358,991	330,966
Investing Activities:
Investments in Property, Plant and Equipment	(201,966)	(191,667)
Decrease/(Increase) in NU Money Pool Lending	(24,125)	97,775
Proceeds From Sale Of Property Plant And Equipment	46,841	0
Other Investing Activities	(6,489)	1,463
Net Cash Flows Used in Investing Activities	(185,739)	(92,429)
Financing Activities:
Cash Dividends on Common Stock	(168,744)	(145,992)
Cash Dividends on Preferred Stock	(2,779)	(2,779)
Increase/(Decrease) in NU Money Pool Borrowings	(6,225)	15,625
Retirements of Rate Reduction Bonds	0	(96,267)
Other Financing Activities	(188)	(170)
Net Cash Flows Provided by/(Used in) Financing Activities	(177,936)	(229,583)
Net Increase/(Decrease) in Cash	(4,684)	8,954
Cash - Beginning of Year	9,762	45
Cash - End of Year	5,078	8,999
Public Service Company of New Hampshire [Member]
Operating Activities:
Net Income	49,129	37,426
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	3,303	4,282
Depreciation	36,030	31,988
Deferred Income Taxes	20,773	15,486
Pension and PBOP Expense, Net of PBOP Contributions	11,112	9,606
Pension Contribution	(15,175)	0
Regulatory (Underrecoveries)/Overrecoveries, Net	726	(5,459)
Amortization of Regulatory Assets/(Liabilities), Net	18,032	(17,322)
Amortization of Rate Reduction Bonds	26,139	24,637
Insurance Proceeds	0	10,000
Other Adjustments	(2,545)	(21,057)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	12,844	3,338
Inventory	11,915	30,714
Taxes Receivable/(Accrued)	9,767	2,057
Change in Accounts Payable	(8,611)	(12,305)
Other Current Assets and Liabilities	(16,885)	(4,558)
Net Cash Flows Provided by Operating Activities	156,554	108,833
Investing Activities:
Investments in Property, Plant and Equipment	(111,459)	(141,709)
Other Investing Activities	1,928	(4,367)
Net Cash Flows Used in Investing Activities	(109,531)	(146,076)
Financing Activities:
Cash Dividends on Common Stock	(29,414)	(25,292)
Increase/(Decrease) in Short-Term Debt	(8,000)	0
Issuance of Long-Term Debt	122,000	0
Increase/(Decrease) in NU Money Pool Borrowings	(4,100)	(18,900)
Retirements of Long-Term Debt	(119,800)	0
Retirements of Rate Reduction Bonds	(26,052)	(24,568)
Capital Contributions from NU Parent	20,000	115,428
Other Financing Activities	(1,803)	(114)
Net Cash Flows Provided by/(Used in) Financing Activities	(47,169)	46,554
Net Increase/(Decrease) in Cash	(146)	9,311
Cash - Beginning of Year	2,559	1,974
Cash - End of Year	2,413	11,285
Western Massachusetts Electric Company [Member]
Operating Activities:
Net Income	18,137	10,908
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	1,860	3,304
Depreciation	12,963	11,821
Deferred Income Taxes	7,004	5,061
Regulatory (Underrecoveries)/Overrecoveries, Net	8,754	(8,181)
Amortization of Regulatory Assets/(Liabilities), Net	1,196	(2,290)
Amortization of Rate Reduction Bonds	8,228	7,722
Other Adjustments	(2,034)	(3,136)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	405	(1,762)
Inventory	(398)	(767)
Taxes Receivable/(Accrued)	9,523	(80)
Change in Accounts Payable	1,021	605
Other Current Assets and Liabilities	(281)	393
Net Cash Flows Provided by Operating Activities	66,378	23,598
Investing Activities:
Investments in Property, Plant and Equipment	(76,898)	(46,354)
Proceeds from Sales of Marketable Securities	57,746	69,196
Purchases of Marketable Securities	(57,888)	(69,350)
Decrease/(Increase) in NU Money Pool Lending	0	(22,000)
Other Investing Activities	(792)	(170)
Net Cash Flows Used in Investing Activities	(77,832)	(68,678)
Financing Activities:
Cash Dividends on Common Stock	(13,153)	(7,441)
Increase/(Decrease) in Short-Term Debt	20,000	0
Issuance of Long-Term Debt	0	95,000
Increase/(Decrease) in NU Money Pool Borrowings	7,700	(136,100)
Retirements of Rate Reduction Bonds	(8,268)	(7,765)
Capital Contributions from NU Parent	5,186	102,600
Other Financing Activities	(11)	(1,214)
Net Cash Flows Provided by/(Used in) Financing Activities	11,454	45,080
Net Increase/(Decrease) in Cash	0	0
Cash - Beginning of Year	1	1
Cash - End of Year	$ 1	$ 1