CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Revenues	$ 1,677,614	$ 1,635,862	$ 3,968,204	$ 3,630,885
Operating Expenses:
Purchased Power and Transmission	624,211	488,302	1,602,362	1,236,111
Operations and Maintenance	373,234	357,169	724,922	703,261
Depreciation	152,207	159,553	303,014	314,530
Amortization of Regulatory Assets/(Liabilities), Net	(3,542)	54,574	54,356	108,623
Amortization of Rate Reduction Bonds	0	8,082	0	42,581
Energy Efficiency Programs	102,711	94,142	241,536	199,913
Taxes Other Than Income Taxes	134,803	123,464	280,335	256,345
Total Operating Expenses	1,383,624	1,285,286	3,206,525	2,861,364
Operating Income	293,990	350,576	761,679	769,521
Interest Expense:
Interest on Long-Term Debt	87,491	85,999	174,868	171,294
Other Interest	5,004	851	7,603	(8,188)
Total Interest Expense	92,495	86,850	182,471	163,106
Other Income/(Loss), Net	5,526	4,944	7,194	12,710
Income Before Income Tax Expense	207,021	268,670	586,402	619,125
Income Tax Expense	77,774	95,606	219,319	216,093
Net Income	129,247	173,064	367,083	403,032
Net Income Attributable to Noncontrolling Interests	1,880	2,043	3,759	3,922
Net Income Attributable to Controlling Interests	127,367	171,021	363,324	399,110
Diluted Earnings Per Common Share	$ 0.40	$ 0.54	$ 1.15	$ 1.26
Basic Earnings Per Common Share	$ 0.40	$ 0.54	$ 1.15	$ 1.27
Common Stock Dividends Per Share Declared	$ 0.39	$ 0.37	$ 0.79	$ 0.74
Weighted Average Common Shares Outstanding:
Basic	315,950,510	315,154,130	315,742,511	315,141,956
Diluted	317,112,801	315,962,619	317,002,461	315,982,578
The Connecticut Light And Power Company [Member]
Operating Revenues	587,324	569,329	1,321,938	1,193,425
Operating Expenses:
Purchased Power and Transmission	199,785	184,854	481,165	414,113
Operations and Maintenance	131,762	123,760	241,276	232,655
Depreciation	46,581	45,122	92,712	87,570
Amortization of Regulatory Assets/(Liabilities), Net	19,615	463	49,546	11,249
Energy Efficiency Programs	35,296	20,854	77,991	43,668
Taxes Other Than Income Taxes	62,159	57,506	129,111	117,697
Total Operating Expenses	495,198	432,559	1,071,801	906,952
Operating Income	92,126	136,770	250,137	286,473
Interest Expense:
Interest on Long-Term Debt	34,639	32,683	67,548	65,318
Other Interest	2,831	1,301	4,165	(1,640)
Total Interest Expense	37,470	33,984	71,713	63,678
Other Income/(Loss), Net	3,130	2,897	4,202	7,084
Income Before Income Tax Expense	57,786	105,683	182,626	229,879
Income Tax Expense	20,401	37,826	65,942	77,014
Net Income	37,385	67,857	116,684	152,865
NSTAR Electric Company [Member]
Operating Revenues	561,513	570,420	1,227,701	1,162,677
Operating Expenses:
Purchased Power and Transmission	242,907	189,843	561,989	403,896
Operations and Maintenance	78,981	87,891	164,905	180,192
Depreciation	46,915	45,441	93,540	90,882
Amortization of Regulatory Assets/(Liabilities), Net	(1,517)	53,554	14,147	100,548
Amortization of Rate Reduction Bonds	0	0	0	15,054
Energy Efficiency Programs	40,255	50,679	88,584	102,382
Taxes Other Than Income Taxes	32,458	30,491	64,610	62,665
Total Operating Expenses	439,999	457,899	987,775	955,619
Operating Income	121,514	112,521	239,926	207,058
Interest Expense:
Interest on Long-Term Debt	19,732	19,809	40,489	39,401
Other Interest	960	(2,620)	1,263	(6,288)
Total Interest Expense	20,692	17,189	41,752	33,113
Other Income/(Loss), Net	(246)	375	(277)	1,149
Income Before Income Tax Expense	100,576	95,707	197,897	175,094
Income Tax Expense	40,447	37,676	79,681	68,941
Net Income	60,129	58,031	118,216	106,153
Public Service Company Of New Hampshire [Member]
Operating Revenues	211,626	216,113	511,458	489,942
Operating Expenses:
Purchased Power and Transmission	68,349	50,073	183,595	151,097
Operations and Maintenance	70,249	62,400	132,462	122,129
Depreciation	24,464	22,947	48,679	45,515
Amortization of Regulatory Assets/(Liabilities), Net	(20,393)	1,081	(7,831)	(1,969)
Amortization of Rate Reduction Bonds	0	4,991	0	19,748
Energy Efficiency Programs	3,292	3,376	7,131	7,046
Taxes Other Than Income Taxes	16,635	16,918	34,348	33,932
Total Operating Expenses	162,596	161,786	398,384	377,498
Operating Income	49,030	54,327	113,074	112,444
Interest Expense:
Interest on Long-Term Debt	11,390	10,811	22,916	22,606
Other Interest	(391)	337	55	709
Total Interest Expense	10,999	11,148	22,971	23,315
Other Income/(Loss), Net	946	632	1,212	1,662
Income Before Income Tax Expense	38,977	43,811	91,315	90,791
Income Tax Expense	14,897	16,617	34,597	34,602
Net Income	24,080	27,194	56,718	56,189
Western Massachusetts Electric Company [Member]
Operating Revenues	108,289	115,015	245,698	239,968
Operating Expenses:
Purchased Power and Transmission	37,619	32,254	87,050	72,298
Operations and Maintenance	23,686	23,136	46,265	44,064
Depreciation	10,317	9,310	20,638	18,280
Amortization of Regulatory Assets/(Liabilities), Net	343	685	741	814
Amortization of Rate Reduction Bonds	0	3,091	0	7,780
Energy Efficiency Programs	10,249	7,925	22,114	16,240
Taxes Other Than Income Taxes	8,396	6,206	16,479	12,494
Total Operating Expenses	90,610	82,607	193,287	171,970
Operating Income	17,679	32,408	52,411	67,998
Interest Expense:
Interest on Long-Term Debt	6,104	6,078	12,165	12,032
Other Interest	603	198	188	537
Total Interest Expense	6,707	6,276	12,353	12,569
Other Income/(Loss), Net	594	419	1,168	1,423
Income Before Income Tax Expense	11,566	26,551	41,226	56,852
Income Tax Expense	4,548	10,137	16,106	21,836
Net Income	$ 7,018	$ 16,414	$ 25,120	$ 35,016