CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities:
Net Income	$ 464,520	$ 367,083
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	327,505	303,014
Deferred Income Tax Expense (Benefit)	176,800	133,149
Pension, SERP and PBOP Expense	48,432	47,558
Pension and PBOP Contributions	(31,032)	(40,640)
Regulatory Over/(Under) Recoveries, Net	(73,547)	164,388
Amortization of Regulatory Assets/(Liabilities), Net	59,438	54,356
Proceeds from DOE Damages Claim, Net	0	125,658
Other	(48,247)	(9,359)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(123,984)	(57,570)
Increase Decrease in Fuel, Materials and Supplies	60,044	26,633
Taxes Receivable/(Accrued)	214,577	(62,900)
Accounts Payable	(228,176)	(112,954)
Other Current Assets and Liabilities, Net	9,226	(41,753)
Net Cash Flows Provided by Operating Activities	855,556	896,663
Investing Activities:
Investments in Property, Plant and Equipment	(740,379)	(724,043)
Proceeds from Sales of Marketable Securities	427,990	256,309
Purchases of Marketable Securities	(408,242)	(257,168)
Other Investing Activities	4,821	3,473
Net Cash Flows Used in Investing Activities	(715,810)	(721,429)
Financing Activities:
Cash Dividends on Common Stock	(264,936)	(237,161)
Cash Dividends on Preferred Stock	(3,759)	(3,759)
Increase/(Decrease) in Short-Term Debt	(449,375)	(213,000)
Issuance of Long-Term Debt	750,000	650,000
Retirements of Long-Term Debt	(166,577)	(376,650)
Other Financing Activities	(7,333)	(3,932)
Net Cash Flows Provided by/(Used in) Financing Activities	(141,980)	(184,502)
Net Increase/(Decrease) in Cash	(2,234)	(9,268)
Cash - Beginning of Year	38,703	43,364
Cash - End of Year	36,469	34,096
The Connecticut Light And Power Company [Member]
Operating Activities:
Net Income	148,004	116,684
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	105,094	92,712
Deferred Income Tax Expense (Benefit)	30,145	43,253
Pension, SERP and PBOP Expense, Net of Contributions	7,079	5,973
Regulatory Over/(Under) Recoveries, Net	(55,302)	18,156
Amortization of Regulatory Assets/(Liabilities), Net	40,776	49,546
Proceeds from DOE Damages Claim		65,370
Other	(2,432)	(3,428)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(73,279)	(129,209)
Taxes Receivable/(Accrued)	123,051	27,679
Accounts Payable	(55,192)	(26,995)
Other Current Assets and Liabilities, Net	2,085	15,705
Net Cash Flows Provided by Operating Activities	270,029	275,446
Investing Activities:
Investments in Property, Plant and Equipment	(242,346)	(221,365)
Other Investing Activities	(1,362)	1,575
Net Cash Flows Used in Investing Activities	(243,708)	(219,790)
Financing Activities:
Cash Dividends on Common Stock	(98,000)	(85,600)
Cash Dividends on Preferred Stock	(2,779)	(2,779)
Issuance of Long-Term Debt	300,000	250,000
Increase/(Decrease) in Notes Payable to Affiliate	(47,800)	(280,900)
Retirements of Long-Term Debt	(162,000)
Capital Contributions from NU Parent	0	70,000
Other Financing Activities	(8,871)	(3,128)
Net Cash Flows Provided by/(Used in) Financing Activities	(19,450)	(52,407)
Net Increase/(Decrease) in Cash	6,871	3,249
Cash - Beginning of Year	2,356	7,237
Cash - End of Year	9,227	10,486
NSTAR Electric Company [Member]
Operating Activities:
Net Income	165,523	118,216
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	97,716	93,540
Deferred Income Tax Expense (Benefit)	61,734	(21,724)
Pension, SERP and PBOP Expense, Net of Contributions	(264)	(8,281)
Regulatory Over/(Under) Recoveries, Net	(96,290)	63,955
Amortization of Regulatory Assets/(Liabilities), Net	(12,901)	14,147
Proceeds from DOE Damages Claim		29,113
Other	(28,653)	(16,870)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(81,524)	(31,746)
Increase Decrease in Fuel, Materials and Supplies	17,595	(7,399)
Taxes Receivable/(Accrued)	100,661	65,692
Accounts Payable	(38,388)	(21,511)
Accounts Payable Related Parties	(2,680)	107,363
Other Current Assets and Liabilities, Net	25,076	3,158
Net Cash Flows Provided by Operating Activities	207,605	387,653
Investing Activities:
Investments in Property, Plant and Equipment	(188,103)	(213,508)
Other Investing Activities	53	576
Net Cash Flows Used in Investing Activities	(188,050)	(212,932)
Financing Activities:
Cash Dividends on Common Stock	(99,000)	(253,000)
Cash Dividends on Preferred Stock	(980)	(980)
Increase/(Decrease) in Short-Term Debt	75,200	91,000
Issuance of Long-Term Debt	0	300,000
Retirements of Long-Term Debt	(4,700)	(301,650)
Other Financing Activities	0	(5,137)
Net Cash Flows Provided by/(Used in) Financing Activities	(29,480)	(169,767)
Net Increase/(Decrease) in Cash	(9,925)	4,954
Cash - Beginning of Year	12,773	8,021
Cash - End of Year	2,848	12,975
Public Service Company Of New Hampshire [Member]
Operating Activities:
Net Income	59,990	56,718
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	51,397	48,679
Deferred Income Tax Expense (Benefit)	47,454	61,093
Pension, SERP and PBOP Expense	2,359	2,416
Regulatory Over/(Under) Recoveries, Net	(3,089)	18,849
Amortization of Regulatory Assets/(Liabilities), Net	27,181	(7,831)
Proceeds from DOE Damages Claim		13,103
Other	6,367	4,386
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(6,597)	3,500
Increase Decrease in Fuel, Materials and Supplies	11,019	8,013
Taxes Receivable/(Accrued)	(20,414)	(55,243)
Accounts Payable	(21,362)	(7,146)
Other Current Assets and Liabilities, Net	(3,792)	(4,166)
Net Cash Flows Provided by Operating Activities	150,513	142,371
Investing Activities:
Investments in Property, Plant and Equipment	(140,171)	(117,387)
Other Investing Activities	169	(101)
Net Cash Flows Used in Investing Activities	(140,002)	(117,488)
Financing Activities:
Cash Dividends on Common Stock	(53,000)	(33,000)
Increase/(Decrease) in Notes Payable to Affiliate	43,000	8,500
Other Financing Activities	(182)	(176)
Net Cash Flows Provided by/(Used in) Financing Activities	(10,182)	(24,676)
Net Increase/(Decrease) in Cash	329	207
Cash - Beginning of Year	489	130
Cash - End of Year	818	337
Western Massachusetts Electric Company [Member]
Operating Activities:
Net Income	27,439	25,120
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	21,223	20,638
Deferred Income Tax Expense (Benefit)	12,503	15,234
Regulatory Over/(Under) Recoveries, Net	(7,911)	28,115
Amortization of Regulatory Assets/(Liabilities), Net	7,264	741
Proceeds from DOE Damages Claim		18,073
Other	(3,598)	1,462
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(11,593)	44,859
Taxes Receivable/(Accrued)	18,774	(19,555)
Accounts Payable	(21,056)	(26,494)
Other Current Assets and Liabilities, Net	859	(11,587)
Net Cash Flows Provided by Operating Activities	43,904	96,606
Investing Activities:
Investments in Property, Plant and Equipment	(62,966)	(61,470)
Proceeds from Sales of Marketable Securities	49,739	44,449
Purchases of Marketable Securities	(50,118)	(44,754)
Net Cash Flows Used in Investing Activities	(63,345)	(61,775)
Financing Activities:
Cash Dividends on Common Stock	(18,600)	(49,000)
Increase/(Decrease) in Notes Payable to Affiliate	39,200	15,900
Other Financing Activities	(16)	(22)
Net Cash Flows Provided by/(Used in) Financing Activities	20,584	(33,122)
Net Increase/(Decrease) in Cash	1,143	1,709
Cash - Beginning of Year	0	0
Cash - End of Year	$ 1,143	$ 1,709