CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities:
Net Income	$ 367,083	$ 403,032
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	303,014	314,530
Deferred Income Tax Expense (Benefit)	133,149	256,294
Pension and PBOP Expense, Net of PBOP Contributions	47,558	97,671
Pension and Other Postretirement Benefit Contributions	(40,640)	(122,826)
Regulatory (Underrecoveries)/Overrecoveries, Net	164,388	(4,793)
Amortization of Regulatory Assets/(Liabilities), Net	54,356	108,623
Amortization of Rate Reduction Bonds	0	42,581
Other Noncash Income (Expense)	(9,359)	19,932
Proceeds from DOE Damages Claim, Net	125,658
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(57,570)	(101,229)
Inventory	26,633	10,964
Taxes Receivable/(Accrued)	(62,900)	(58,350)
Change in Accounts Payable	(112,954)	(127,379)
Other Current Assets and Liabilities	(41,753)	(70,026)
Net Cash Flows Provided by Operating Activities	896,663	769,024
Investing Activities:
Investments in Property, Plant and Equipment	(724,043)	(700,252)
Proceeds from Sales of Marketable Securities	256,309	342,251
Purchases of Marketable Securities	(257,168)	(424,096)
DecreaseInRestrictedCash	2,894	65,121
Other Investing Activities	579	(843)
Net Cash Flows Used in Investing Activities	(721,429)	(717,819)
Financing Activities:
Cash Dividends on Common Stock	(237,161)	(232,068)
Cash Dividends on Preferred Stock	(3,759)	(3,922)
Increase/(Decrease) in Short-Term Debt	(213,000)	(720,500)
Issuance of Long-Term Debt	650,000	1,350,000
Retirements of Long-Term Debt	(376,650)	(360,635)
Retirements of Rate Reduction Bonds	0	(82,139)
Other Financing Activities	(3,932)	(11,634)
Net Cash Flows Provided by/(Used in) Financing Activities	(184,502)	(60,898)
Net Increase/(Decrease) in Cash	(9,268)	(9,693)
Cash - Beginning of Year	43,364	45,748
Cash - End of Year	34,096	36,055
The Connecticut Light And Power Company [Member]
Operating Activities:
Net Income	116,684	152,865
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	92,712	87,570
Deferred Income Tax Expense (Benefit)	43,253	99,045
Pension and PBOP Expense, Net of PBOP Contributions	5,973	13,826
Regulatory (Underrecoveries)/Overrecoveries, Net	18,156	(36,902)
Amortization of Regulatory Assets/(Liabilities), Net	49,546	11,249
Other Noncash Income (Expense)	(3,428)	(13,476)
Proceeds from DOE Damages Claim	65,370	0
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(129,209)	(33,976)
Taxes Receivable/(Accrued)	27,679	(14,081)
Change in Accounts Payable	(26,995)	(95,487)
Other Current Assets and Liabilities	15,705	7,548
Net Cash Flows Provided by Operating Activities	275,446	178,181
Investing Activities:
Investments in Property, Plant and Equipment	(221,365)	(184,875)
Other Investing Activities	1,575	884
Net Cash Flows Used in Investing Activities	(219,790)	(183,991)
Financing Activities:
Cash Dividends on Common Stock	(85,600)	(76,000)
Cash Dividends on Preferred Stock	(2,779)	(2,779)
Increase/(Decrease) in Short-Term Debt	0	(89,000)
Issuance of Long-Term Debt	250,000	400,000
Increase/(Decrease) in Notes Payable to Affiliate	(280,900)	(215,800)
Capital Contributions from NU Parent	70,000
Other Financing Activities	(3,128)	(6,345)
Net Cash Flows Provided by/(Used in) Financing Activities	(52,407)	10,076
Net Increase/(Decrease) in Cash	3,249	4,266
Cash - Beginning of Year	7,237	1
Cash - End of Year	10,486	4,267
NSTAR Electric Company [Member]
Operating Activities:
Net Income	118,216	106,153
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	12,272	11,307
Depreciation	93,540	90,882
Deferred Income Tax Expense (Benefit)	(21,724)	28,750
Pension and PBOP Expense, Net of PBOP Contributions	(8,281)	(5,139)
Regulatory (Underrecoveries)/Overrecoveries, Net	63,955	(33,901)
Amortization of Regulatory Assets/(Liabilities), Net	14,147	100,548
Amortization of Rate Reduction Bonds	0	15,054
Other Noncash Income (Expense)	(29,142)	(47,574)
Proceeds from DOE Damages Claim	29,113
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(31,746)	(60,174)
Inventory	(7,399)	3,294
Taxes Receivable/(Accrued)	65,692	(39,813)
Change in Accounts Payable	(21,511)	(8,686)
Other Current Assets and Liabilities	3,158	(11,702)
IncreaseDecreaseInAccountsPayableRelatedParties	107,363	(57,369)
Net Cash Flows Provided by Operating Activities	387,653	91,630
Investing Activities:
Investments in Property, Plant and Equipment	(213,508)	(207,380)
DecreaseInRestrictedCash	581	38,429
Other Investing Activities	(5)	77
Net Cash Flows Used in Investing Activities	(212,932)	(168,874)
Financing Activities:
Cash Dividends on Common Stock	(253,000)	(56,000)
Cash Dividends on Preferred Stock	(980)	(1,143)
Increase/(Decrease) in Short-Term Debt	91,000	(23,000)
Issuance of Long-Term Debt	300,000	200,000
Retirements of Long-Term Debt	(301,650)	(1,650)
Retirements of Rate Reduction Bonds		(43,493)
Other Financing Activities	(5,137)	0
Net Cash Flows Provided by/(Used in) Financing Activities	(169,767)	74,714
Net Increase/(Decrease) in Cash	4,954	(2,530)
Cash - Beginning of Year	8,021	13,695
Cash - End of Year	12,975	11,165
Public Service Company Of New Hampshire [Member]
Operating Activities:
Net Income	56,718	56,189
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	48,679	45,515
Deferred Income Tax Expense (Benefit)	61,093	25,450
Pension and PBOP Expense, Net of PBOP Contributions	3,249	14,228
Pension and Other Postretirement Benefit Contributions	(833)	(45,721)
Regulatory (Underrecoveries)/Overrecoveries, Net	18,849	4,844
Amortization of Regulatory Assets/(Liabilities), Net	(7,831)	(1,969)
Amortization of Rate Reduction Bonds	0	19,748
Other Noncash Income (Expense)	4,386	3,123
Proceeds from DOE Damages Claim	13,103
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	3,500	597
Inventory	8,013	(13,289)
Taxes Receivable/(Accrued)	(55,243)	21,584
Change in Accounts Payable	(7,146)	26,159
Other Current Assets and Liabilities	(4,166)	(17,743)
Net Cash Flows Provided by Operating Activities	142,371	138,715
Investing Activities:
Investments in Property, Plant and Equipment	(117,387)	(109,565)
DecreaseInRestrictedCash	(45)	22,039
Other Investing Activities	(56)	(13)
Net Cash Flows Used in Investing Activities	(117,488)	(87,539)
Financing Activities:
Cash Dividends on Common Stock	(33,000)	(34,000)
Increase/(Decrease) in Short-Term Debt	8,500	118,900
Retirements of Long-Term Debt		(108,985)
Retirements of Rate Reduction Bonds	0	(29,294)
Other Financing Activities	(176)	(225)
Net Cash Flows Provided by/(Used in) Financing Activities	(24,676)	(53,604)
Net Increase/(Decrease) in Cash	207	(2,428)
Cash - Beginning of Year	130	2,493
Cash - End of Year	337	65
Western Massachusetts Electric Company [Member]
Operating Activities:
Net Income	25,120	35,016
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	20,638	18,280
Deferred Income Tax Expense (Benefit)	15,234	33,317
Regulatory (Underrecoveries)/Overrecoveries, Net	28,115	(5,094)
Amortization of Regulatory Assets/(Liabilities), Net	741	814
Amortization of Rate Reduction Bonds	0	7,780
Other Noncash Income (Expense)	1,462	572
Proceeds from DOE Damages Claim	18,073
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	44,859	(8,681)
Taxes Receivable/(Accrued)	(19,555)	21,081
Change in Accounts Payable	(26,494)	21,389
Other Current Assets and Liabilities	(11,587)	(5,166)
Net Cash Flows Provided by Operating Activities	96,606	119,308
Investing Activities:
Investments in Property, Plant and Equipment	(61,470)	(96,051)
Proceeds from Sales of Marketable Securities	44,449	41,604
Purchases of Marketable Securities	(44,754)	(41,961)
Other Investing Activities	0	4,601
Net Cash Flows Used in Investing Activities	(61,775)	(91,807)
Financing Activities:
Cash Dividends on Common Stock	(49,000)	(20,000)
Increase/(Decrease) in Notes Payable to Affiliate	15,900	3,300
Retirements of Rate Reduction Bonds	0	(9,352)
Other Financing Activities	(22)	(31)
Net Cash Flows Provided by/(Used in) Financing Activities	(33,122)	(26,083)
Net Increase/(Decrease) in Cash	1,709	1,418
Cash - Beginning of Year	0	1
Cash - End of Year	$ 1,709	$ 1,419