CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Revenues	$ 1,892,532	$ 1,892,590	$ 5,860,736	$ 5,523,475
Operating Expenses:
Purchased Power and Transmission	716,631	645,881	2,318,993	1,881,992
Operations and Maintenance	344,092	386,700	1,069,015	1,089,960
Depreciation	153,210	149,105	456,224	463,635
Amortization of Regulatory Assets/(Liabilities), Net	(22,531)	70,046	31,826	178,668
Amortization of Rate Reduction Bonds	0	0	0	42,581
Energy Efficiency Programs	118,693	106,097	360,228	306,010
Taxes Other Than Income Taxes	141,527	135,499	421,862	391,846
Total Operating Expenses	1,451,622	1,493,328	4,658,148	4,354,692
Operating Income	440,910	399,262	1,202,588	1,168,783
Interest Expense:
Interest on Long-Term Debt	85,208	84,911	260,076	256,205
Other Interest	4,530	2,565	12,132	(5,622)
Total Interest Expense	89,738	87,476	272,208	250,583
Other Income/(Loss), Net	11,860	8,945	19,054	21,655
Income Before Income Tax Expense	363,032	320,731	949,434	939,855
Income Tax Expense	126,539	109,351	345,858	325,442
Net Income	236,493	211,380	603,576	614,413
Net Income Attributable to Noncontrolling Interests	1,879	1,879	5,639	5,803
Net Income Attributable to Controlling Interests	234,614	209,501	597,937	608,610
Earnings Per Share Basic And Diluted	$ 0.74	$ 0.66	$ 1.89	$ 1.93
Common Stock Dividends Per Share Declared	$ 0.39	$ 0.37	$ 1.18	$ 1.10
Weighted Average Common Shares Outstanding:
Basic	316,340,691	315,291,346	315,941,904	315,191,752
Diluted	317,554,925	316,218,239	317,186,490	316,061,131
The Connecticut Light And Power Company [Member]
Operating Revenues	695,642	648,420	2,017,580	1,841,846
Operating Expenses:
Purchased Power and Transmission	255,787	253,152	736,952	667,266
Operations and Maintenance	127,285	127,104	368,562	359,759
Depreciation	46,886	44,786	139,598	132,356
Amortization of Regulatory Assets/(Liabilities), Net	13,098	(27)	62,644	11,223
Energy Efficiency Programs	41,399	24,544	119,389	68,211
Taxes Other Than Income Taxes	64,994	64,979	194,105	182,676
Total Operating Expenses	549,449	514,538	1,621,250	1,421,491
Operating Income	146,193	133,882	396,330	420,355
Interest Expense:
Interest on Long-Term Debt	34,743	32,845	102,290	98,163
Other Interest	3,992	2,439	8,158	801
Total Interest Expense	38,735	35,284	110,448	98,964
Other Income/(Loss), Net	6,456	3,861	10,658	10,946
Income Before Income Tax Expense	113,914	102,459	296,540	332,337
Income Tax Expense	30,038	36,136	95,980	113,149
Net Income	83,876	66,323	200,560	219,188
NSTAR Electric Company [Member]
Operating Revenues	727,909	753,879	1,955,609	1,916,557
Operating Expenses:
Purchased Power and Transmission	317,784	255,244	879,773	659,140
Operations and Maintenance	79,705	97,069	244,610	277,261
Depreciation	47,455	45,441	140,996	136,323
Amortization of Regulatory Assets/(Liabilities), Net	(15,063)	72,740	(916)	173,289
Amortization of Rate Reduction Bonds	0	0	0	15,054
Energy Efficiency Programs	56,915	58,798	145,499	161,180
Taxes Other Than Income Taxes	34,513	32,610	99,121	95,275
Total Operating Expenses	521,309	561,902	1,509,083	1,517,522
Operating Income	206,600	191,977	446,526	399,035
Interest Expense:
Interest on Long-Term Debt	17,996	19,860	58,485	59,261
Other Interest	(658)	(1,324)	606	(7,612)
Total Interest Expense	17,338	18,536	59,091	51,649
Other Income/(Loss), Net	3,287	2,126	3,011	3,275
Income Before Income Tax Expense	192,549	175,567	390,446	350,661
Income Tax Expense	76,975	68,558	156,655	137,499
Net Income	115,574	107,009	233,791	213,162
Public Service Company Of New Hampshire [Member]
Operating Revenues	223,664	218,608	735,123	708,550
Operating Expenses:
Purchased Power and Transmission	64,397	46,668	247,992	197,765
Operations and Maintenance	65,563	69,477	198,025	191,606
Depreciation	24,568	22,919	73,247	68,433
Amortization of Regulatory Assets/(Liabilities), Net	(9,734)	225	(17,565)	(1,745)
Amortization of Rate Reduction Bonds	0	0	0	19,748
Energy Efficiency Programs	3,766	3,990	10,897	11,036
Taxes Other Than Income Taxes	18,702	18,706	53,051	52,640
Total Operating Expenses	167,262	161,985	565,647	539,483
Operating Income	56,402	56,623	169,476	169,067
Interest Expense:
Interest on Long-Term Debt	10,896	10,345	33,812	32,951
Other Interest	128	521	183	1,230
Total Interest Expense	11,024	10,866	33,995	34,181
Other Income/(Loss), Net	461	792	1,673	2,454
Income Before Income Tax Expense	45,839	46,549	137,154	137,340
Income Tax Expense	17,603	18,196	52,199	52,797
Net Income	28,236	28,353	84,955	84,543
Western Massachusetts Electric Company [Member]
Operating Revenues	118,145	121,795	363,843	361,763
Operating Expenses:
Purchased Power and Transmission	43,926	38,797	130,977	111,095
Operations and Maintenance	20,820	26,148	67,085	70,213
Depreciation	10,506	9,426	31,144	27,707
Amortization of Regulatory Assets/(Liabilities), Net	(8,519)	(1,412)	(7,778)	(598)
Amortization of Rate Reduction Bonds	0	0	0	7,780
Energy Efficiency Programs	10,983	12,222	33,096	28,462
Taxes Other Than Income Taxes	9,200	7,696	25,679	20,188
Total Operating Expenses	86,916	92,877	280,203	264,847
Operating Income	31,229	28,918	83,640	96,916
Interest Expense:
Interest on Long-Term Debt	6,029	5,814	18,195	17,846
Other Interest	547	417	734	954
Total Interest Expense	6,576	6,231	18,929	18,800
Other Income/(Loss), Net	502	926	1,670	2,349
Income Before Income Tax Expense	25,155	23,613	66,381	80,465
Income Tax Expense	10,490	8,588	26,596	30,424
Net Income	$ 14,665	$ 15,025	$ 39,785	$ 50,041