CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities:
Net Income	$ 237,836	$ 229,968
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	150,807	154,977
Deferred Income Tax Expense (Benefit)	137,417	168,938
Pension and PBOP Expense, Net of PBOP Contributions	24,995	53,102
Pension and Other Postretirement Benefit Contributions	(6,622)	(47,048)
Regulatory (Underrecoveries)/Overrecoveries, Net	872	39,218
Amortization of Regulatory Assets/(Liabilities), Net	57,898	54,049
Amortization of Rate Reduction Bonds	0	34,499
Other Noncash Income (Expense)	(7,574)	(51,106)
Proceeds from DOE Damages Claim	163,300	77,936
CYAPC and YAEC Deferred DOE Proceeds	(163,300)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(182,221)	(129,431)
Inventory	75,041	28,487
Taxes Receivable/(Accrued)	(59,840)	(21,295)
Change in Accounts Payable	53,905	(86,916)
Other Current Assets and Liabilities	11,282	(32,235)
Net Cash Flows Provided by Operating Activities	493,796	473,143
Investing Activities:
Investments in Property, Plant and Equipment	(348,691)	(388,950)
Proceeds from Sales of Marketable Securities	128,505	98,070
Purchases of Marketable Securities	(132,605)	(184,030)
Other Investing Activities	1,637	27,997
Net Cash Flows Used in Investing Activities	(351,154)	(446,913)
Financing Activities:
Cash Dividends on Common Stock	(118,460)	(116,431)
Cash Dividends on Preferred Stock	(1,879)	(1,879)
Increase/(Decrease) in Short-Term Debt	(299,500)	(228,000)
Issuance of Long-Term Debt	400,000	400,000
Retirements of Long-Term Debt	(75,000)	0
Retirements of Rate Reduction Bonds	0	(62,529)
Other Financing Activities	(2,017)	(2,322)
Net Cash Flows Provided by/(Used in) Financing Activities	(96,856)	(11,161)
Net Increase/(Decrease) in Cash	45,786	15,069
Cash - Beginning of Year	43,364	45,748
Cash - End of Year	89,150	60,817
The Connecticut Light And Power Company [Member]
Operating Activities:
Net Income	79,299	85,008
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	46,130	42,448
Deferred Income Tax Expense (Benefit)	59,334	65,475
Pension and PBOP Expense, Net of PBOP Contributions	4,086	8,183
Regulatory (Underrecoveries)/Overrecoveries, Net	(40,399)	(15,835)
Amortization of Regulatory Assets/(Liabilities), Net	29,931	10,787
Other Noncash Income (Expense)	4,536	3,653
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(82,833)	(32,041)
Taxes Receivable/(Accrued)	7,015	(12,777)
Change in Accounts Payable	(2,872)	(106,140)
Other Current Assets and Liabilities	(8,730)	(22,340)
Net Cash Flows Provided by Operating Activities	95,497	26,421
Investing Activities:
Investments in Property, Plant and Equipment	(107,993)	(89,360)
Other Investing Activities	1,027	447
Net Cash Flows Used in Investing Activities	(106,966)	(88,913)
Financing Activities:
Cash Dividends on Common Stock	(42,800)	(38,000)
Cash Dividends on Preferred Stock	(1,390)	(1,390)
Increase/(Decrease) in Short-Term Debt	0	(89,000)
Issuance of Long-Term Debt	0	400,000
Increase/(Decrease) in Notes Payable to Affiliate	64,300	(194,700)
Other Financing Activities	(203)	(6,112)
Net Cash Flows Provided by/(Used in) Financing Activities	19,907	70,798
Net Increase/(Decrease) in Cash	8,438	8,306
Cash - Beginning of Year	7,237	1
Cash - End of Year	15,675	8,307
NSTAR Electric Company [Member]
Operating Activities:
Net Income	58,087	48,122
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	6,096	5,523
Depreciation	46,626	45,441
Deferred Income Tax Expense (Benefit)	1,585	26,571
Pension and PBOP Expense, Net of PBOP Contributions	(4,908)	6,420
Regulatory (Underrecoveries)/Overrecoveries, Net	6,423	(2,951)
Amortization of Regulatory Assets/(Liabilities), Net	15,664	46,994
Amortization of Rate Reduction Bonds	0	15,054
Other Noncash Income (Expense)	(15,538)	(23,969)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(14,348)	(31,455)
Inventory	(3,606)	(7,060)
Taxes Receivable/(Accrued)	21,504	(22,501)
Change in Accounts Payable	86,309	1,867
Other Current Assets and Liabilities	31,112	18,916
IncreaseDecreaseInAccountsPayableRelatedParties	(43,654)	(37,547)
Net Cash Flows Provided by Operating Activities	191,352	89,425
Investing Activities:
Investments in Property, Plant and Equipment	(94,957)	(107,573)
DecreaseInRestrictedCash	(530)	33,631
Other Investing Activities	41	(86)
Net Cash Flows Used in Investing Activities	(95,446)	(74,028)
Financing Activities:
Cash Dividends on Common Stock	(253,000)	0
Cash Dividends on Preferred Stock	(490)	(490)
Increase/(Decrease) in Short-Term Debt	(103,500)	32,000
Issuance of Long-Term Debt	300,000	0
Retirements of Rate Reduction Bonds	0	(43,493)
Other Financing Activities	(4,902)	0
Net Cash Flows Provided by/(Used in) Financing Activities	(61,892)	(11,983)
Net Increase/(Decrease) in Cash	34,014	3,414
Cash - Beginning of Year	8,021	13,695
Cash - End of Year	42,035	17,109
Public Service Company Of New Hampshire [Member]
Operating Activities:
Net Income	32,638	28,996
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	24,215	22,568
Deferred Income Tax Expense (Benefit)	33,667	10,143
Pension and PBOP Expense, Net of PBOP Contributions	1,961	8,022
Pension and Other Postretirement Benefit Contributions	(30)	(35,146)
Regulatory (Underrecoveries)/Overrecoveries, Net	6,827	(799)
Amortization of Regulatory Assets/(Liabilities), Net	12,562	(3,051)
Amortization of Rate Reduction Bonds	0	14,756
Other Noncash Income (Expense)	2,729	(1,505)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(14,268)	(13,889)
Inventory	34,326	562
Taxes Receivable/(Accrued)	(30,254)	23,137
Change in Accounts Payable	3,403	31,257
Other Current Assets and Liabilities	21,505	22,152
Net Cash Flows Provided by Operating Activities	129,281	107,203
Investing Activities:
Investments in Property, Plant and Equipment	(61,864)	(64,956)
Other Investing Activities	(76)	(17)
Net Cash Flows Used in Investing Activities	(61,940)	(64,973)
Financing Activities:
Cash Dividends on Common Stock	(16,500)	(17,000)
Increase/(Decrease) in Short-Term Debt	(46,600)	(9,900)
Retirements of Rate Reduction Bonds	0	(14,320)
Other Financing Activities	(87)	(127)
Net Cash Flows Provided by/(Used in) Financing Activities	(63,187)	(41,347)
Net Increase/(Decrease) in Cash	4,154	883
Cash - Beginning of Year	130	2,493
Cash - End of Year	4,284	3,376
Western Massachusetts Electric Company [Member]
Operating Activities:
Net Income	18,102	18,603
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	10,321	8,970
Deferred Income Tax Expense (Benefit)	14,688	16,828
Regulatory (Underrecoveries)/Overrecoveries, Net	5,780	(2,357)
Amortization of Regulatory Assets/(Liabilities), Net	399	129
Amortization of Rate Reduction Bonds	0	4,689
Other Noncash Income (Expense)	(1,351)	(1,299)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	34,905	(4,907)
Taxes Receivable/(Accrued)	(17,126)	21,600
Change in Accounts Payable	(10,516)	17,667
Other Current Assets and Liabilities	(8,869)	(8,931)
Net Cash Flows Provided by Operating Activities	46,333	70,992
Investing Activities:
Investments in Property, Plant and Equipment	(30,347)	(66,340)
Proceeds from Sales of Marketable Securities	34,656	21,035
Purchases of Marketable Securities	(34,804)	(21,191)
Other Investing Activities	0	500
Net Cash Flows Used in Investing Activities	(30,495)	(65,996)
Financing Activities:
Cash Dividends on Common Stock	(49,000)	(10,000)
Increase/(Decrease) in Notes Payable to Affiliate	37,400	11,500
Retirements of Rate Reduction Bonds	0	(4,716)
Other Financing Activities	(11)	(13)
Net Cash Flows Provided by/(Used in) Financing Activities	(11,611)	(3,229)
Net Increase/(Decrease) in Cash	4,227	1,767
Cash - Beginning of Year	0	1
Cash - End of Year	$ 4,227	$ 1,768