10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

FORM 10-Q

[X]	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE      SECURITIES EXCHANGE ACT OF 1934
	For the Quarterly Period Ended March 31, 2013
	OR
[  ]	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE      SECURITIES EXCHANGE ACT OF 1934
	For the transition period from ____________ to ____________

Commission File Number	Registrant; State of Incorporation; Address; and Telephone Number	I.R.S. Employer Identification No.
1-5324	NORTHEAST UTILITIES (a Massachusetts voluntary association) One Federal Street Building 111-4 Springfield, Massachusetts 01105 Telephone:  (413) 785-5871	04-2147929

0-00404 THE CONNECTICUT LIGHT AND POWER COMPANY
(a Connecticut corporation)
107 Selden Street
Berlin, Connecticut 06037-1616
Telephone:  (860) 665-5000 06-0303850

1-02301 NSTAR ELECTRIC COMPANY
(a Massachusetts corporation)
800 Boylston Street
Boston, Massachusetts 02199
Telephone:  (617) 424-2000 04-1278810

1-6392 PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
(a New Hampshire corporation)
Energy Park
780 North Commercial Street
Manchester, New Hampshire 03101-1134
Telephone:  (603) 669-4000 02-0181050

0-7624 WESTERN MASSACHUSETTS ELECTRIC COMPANY
(a Massachusetts corporation)
One Federal Street
Building 111-4
Springfield, Massachusetts 01105
Telephone:  (413) 785-5871 04-1961130

Indicate by check mark whether the registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.

Yes	No
ü

Indicate by check mark whether the registrants have submitted electronically and posted on its corporate Web sites, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes	No
ü

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.  See definition of "accelerated filer and large accelerated filer" in Rule 12b-2 of the Exchange Act.  (Check one):

	Large Accelerated Filer	Accelerated Filer	Non-accelerated Filer
Northeast Utilities	ü
The Connecticut Light and Power Company			ü
NSTAR Electric Company			ü
Public Service Company of New Hampshire			ü
Western Massachusetts Electric Company			ü

Indicate by check mark whether the registrants are shell companies (as defined in Rule 12b-2 of the Exchange Act):

	Yes	No
Northeast Utilities		ü
The Connecticut Light and Power Company		ü
NSTAR Electric Company		ü
Public Service Company of New Hampshire		ü
Western Massachusetts Electric Company		ü

Indicate the number of shares outstanding of each of the issuers' classes of common stock, as of the latest practicable date:

Company - Class of Stock	Outstanding as of April 30, 2013
Northeast Utilities Common shares, $5.00 par value	314,621,345 shares
The Connecticut Light and Power Company Common stock, $10.00 par value	6,035,205 shares
NSTAR Electric Company Common stock, $1.00 par value	100 shares
Public Service Company of New Hampshire Common stock, $1.00 par value	301 shares
Western Massachusetts Electric Company Common stock, $25.00 par value	434,653 shares

Northeast Utilities, directly or indirectly, holds all of the 6,035,205 shares, 100 shares, 301 shares, and 434,653 shares of the outstanding common stock of The Connecticut Light and Power Company, NSTAR Electric Company, Public Service Company of New Hampshire and Western Massachusetts Electric Company, respectively.

NSTAR Electric Company, Public Service Company of New Hampshire and Western Massachusetts Electric Company each meet the conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q, and each is therefore filing this Form 10-Q with the reduced disclosure format specified in General Instruction H(2) of Form 10-Q.

GLOSSARY OF TERMS

The following is a glossary of abbreviations or acronyms that are found in this report.
CURRENT OR FORMER NU COMPANIES, SEGMENTS OR INVESTMENTS:
CL&P	The Connecticut Light and Power Company
CYAPC	Connecticut Yankee Atomic Power Company
Hopkinton	Hopkinton LNG Corp., a wholly owned subsidiary of NSTAR LLC
HWP	HWP Company, formerly the Holyoke Water Power Company
MYAPC	Maine Yankee Atomic Power Company
NGS	Northeast Generation Services Company and subsidiaries
NPT	Northern Pass Transmission LLC
NSTAR	Parent Company of NSTAR Electric, NSTAR Gas and other subsidiaries (prior to the merger with NU); also the term used for NSTAR LLC and its subsidiaries
NSTAR Electric	NSTAR Electric Company
NSTAR Electric & Gas	NSTAR Electric & Gas Corporation, a Northeast Utilities service company
NSTAR Gas	NSTAR Gas Company
NSTAR LLC	Post-merger parent company of NSTAR Electric, NSTAR Gas and other subsidiaries, and successor to NSTAR
NU Enterprises	NU Enterprises, Inc., the parent company of Select Energy, NGS, NGS Mechanical, Select Energy Contracting, Inc. and E.S. Boulos Company
NU or the Company	Northeast Utilities and subsidiaries
NU parent and other companies	NU parent and other companies is comprised of NU parent, NSTAR LLC, NSTAR Electric & Gas, NUSCO and other subsidiaries, including NU Enterprises, NSTAR Communications, Inc., HWP, RRR (a real estate subsidiary), the non-energy-related subsidiaries of Yankee (Yankee Energy Services Company and Yankee Energy Financial Services Company), and the consolidated operations of CYAPC and YAEC
NUSCO	Northeast Utilities Service Company
NUTV	NU Transmission Ventures, Inc., the parent company of NPT and Renewable Properties, Inc.
PSNH	Public Service Company of New Hampshire
Regulated companies	NU's Regulated companies, comprised of the electric distribution and transmission businesses of CL&P, NSTAR Electric, PSNH, and WMECO, the natural gas distribution businesses of Yankee Gas and NSTAR Gas, the generation activities of PSNH and WMECO, and NPT
RRR	The Rocky River Realty Company
Select Energy	Select Energy, Inc.
WMECO	Western Massachusetts Electric Company
YAEC	Yankee Atomic Electric Company
Yankee	Yankee Energy System, Inc.
Yankee Companies	CYAPC, YAEC and MYAPC
Yankee Gas	Yankee Gas Services Company
REGULATORS:
DEEP	Connecticut Department of Energy and Environmental Protection
DOE	U.S. Department of Energy
DOER	Massachusetts Department of Energy Resources
DPU	Massachusetts Department of Public Utilities
EPA	U.S. Environmental Protection Agency
FERC	Federal Energy Regulatory Commission
ISO-NE	ISO New England, Inc., the New England Independent System Operator
MA DEP	Massachusetts Department of Environmental Protection
NHPUC	New Hampshire Public Utilities Commission
PURA	Connecticut Public Utilities Regulatory Authority
SEC	U.S. Securities and Exchange Commission
SJC	Supreme Judicial Court of Massachusetts
OTHER:
AFUDC	Allowance For Funds Used During Construction
AOCI	Accumulated Other Comprehensive Income/(Loss)
ARO	Asset Retirement Obligation
C&LM	Conservation and Load Management
CfD	Contract for Differences
Clean Air Project	The construction of a wet flue gas desulphurization system, known as "scrubber technology," to reduce mercury emissions of the Merrimack coal-fired generation station in Bow, New Hampshire
CPSL	Capital Projects Scheduling List
CTA	Competitive Transition Assessment
CWIP	Construction work in progress
EPS	Earnings Per Share
ERISA	Employee Retirement Income Security Act of 1974
ES	Default Energy Service
ESOP	Employee Stock Ownership Plan
ESPP	Employee Share Purchase Plan
Fitch	Fitch Ratings
FMCC	Federally Mandated Congestion Charge
FTR	Financial Transmission Rights
GAAP	Accounting principles generally accepted in the United States of America
GSC	Generation Service Charge
GSRP	Greater Springfield Reliability Project
GWh	Gigawatt-Hours
HG&E	Holyoke Gas and Electric, a municipal department of the City of Holyoke, MA
HQ	Hydro-Québec, a corporation wholly owned by the Québec government, including its divisions that produce, transmit and distribute electricity in Québec, Canada
HVDC	High voltage direct current
Hydro Renewable Energy	Hydro Renewable Energy, Inc., a wholly owned subsidiary of Hydro-Québec
IPP	Independent Power Producers
ISO-NE Tariff	ISO-NE FERC Transmission, Markets and Services Tariff
kV	Kilovolt
kW	Kilowatt (equal to one thousand watts)
kWh	Kilowatt-Hours (the basic unit of electricity energy equal to one kilowatt of power supplied for one hour)
LNG	Liquefied natural gas
LOC	Letter of Credit
LRS	Supplier of last resort service
MGP	Manufactured Gas Plant
MMBtu	One million British thermal units
Moody's	Moody's Investors Services, Inc.
MW	Megawatt
MWh	Megawatt-Hours
NEEWS	New England East-West Solution
Northern Pass	The high voltage direct current transmission line project from Canada into New Hampshire
NU Money Pool	Northeast Utilities Money Pool
NU supplemental benefit trust	The NU Trust Under Supplemental Executive Retirement Plan
NU 2012 Form 10-K	The Northeast Utilities and Subsidiaries 2012 combined Annual Report on Form 10-K as filed with the SEC
PAM	Pension and PBOP Rate Adjustment Mechanism
PBOP	Postretirement Benefits Other Than Pension
PBOP Plan	Postretirement Benefits Other Than Pension Plan that provides certain retiree health care benefits, primarily medical and dental, and life insurance benefits
PCRBs	Pollution Control Revenue Bonds
Pension Plan	Single uniform noncontributory defined benefit retirement plan
PPA	Pension Protection Act
RECs	Renewable Energy Certificates
Regulatory ROE	The average cost of capital method for calculating the return on equity related to the distribution and generation business segment excluding the wholesale transmission segment
ROE	Return on Equity
RRB	Rate Reduction Bond or Rate Reduction Certificate
RSUs	Restricted share units
S&P	Standard & Poor's Financial Services LLC
SBC	Systems Benefits Charge
SCRC	Stranded Cost Recovery Charge
SERP	Supplemental Executive Retirement Plan
SIP	Simplified Incentive Plan
SS	Standard service
TCAM	Transmission Cost Adjustment Mechanism
TSA	Transmission Service Agreement
UI	The United Illuminating Company

ii

NORTHEAST UTILITIES AND SUBSIDIARIES
THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY
NSTAR ELECTRIC COMPANY AND SUBSIDIARIES
PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES
WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY

TABLE OF CONTENTS

	Page
PART I - FINANCIAL INFORMATION
ITEM 1 - Unaudited Condensed Consolidated Financial Statements for the Following Companies:
Northeast Utilities and Subsidiaries (Unaudited)
Condensed Consolidated Balance Sheets – March 31, 2013 and December 31, 2012	1
Condensed Consolidated Statements of Income – Three Months Ended March 31, 2013 and 2012	3
Condensed Consolidated Statements of Comprehensive Income – Three Months Ended March 31, 2013 and 2012	3
Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2013 and 2012	4
The Connecticut Light and Power Company and Subsidiary (Unaudited)
Condensed Consolidated Balance Sheets – March 31, 2013 and December 31, 2012	5
Condensed Consolidated Statements of Income – Three Months Ended March 31, 2013 and 2012	7
Condensed Consolidated Statements of Comprehensive Income – Three Months Ended March 31, 2013 and 2012	7
Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2013 and 2012	8
NSTAR Electric Company and Subsidiaries (Unaudited)
Condensed Consolidated Balance Sheets – March 31, 2013 and December 31, 2012	9
Condensed Consolidated Statements of Income – Three Months Ended March 31, 2013 and 2012	11
Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2013 and 2012	12
Public Service Company of New Hampshire and Subsidiaries (Unaudited)
Condensed Consolidated Balance Sheets – March 31, 2013 and December 31, 2012	13
Condensed Consolidated Statements of Income – Three Months Ended March 31, 2013 and 2012	15
Condensed Consolidated Statements of Comprehensive Income – Three Months Ended March 31, 2013 and 2012	15
Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2013 and 2012	16
Western Massachusetts Electric Company and Subsidiary (Unaudited)
Condensed Consolidated Balance Sheets – March 31, 2013 and December 31, 2012	17
Condensed Consolidated Statements of Income – Three Months Ended March 31, 2013 and 2012	19
Condensed Consolidated Statements of Comprehensive Income – Three Months Ended March 31, 2013 and 2012	19
Condensed Consolidated Statements of Cash Flows – Three Months Ended March 31, 2013 and 2012	20
Combined Notes to Condensed Consolidated Financial Statements	21

iii

	Page
ITEM 2 – Management’s Discussion and Analysis of Financial Condition and Results of Operations for the following companies:
Northeast Utilities and Subsidiaries	41
The Connecticut Light and Power Company and Subsidiary	54
NSTAR Electric Company and Subsidiaries	57
Public Service Company of New Hampshire and Subsidiaries	60
Western Massachusetts Electric Company and Subsidiary	62
ITEM 3 – Quantitative and Qualitative Disclosures About Market Risk	64
ITEM 4 – Controls and Procedures	64
PART II – OTHER INFORMATION
ITEM 1 – Legal Proceedings	65
ITEM 1A – Risk Factors	65
ITEM 2 – Unregistered Sales of Equity Securities and Use of Proceeds	65
ITEM 6 – Exhibits	66
SIGNATURES	68

iv

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v

NORTHEAST UTILITIES AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
ASSETS
Current Assets:
	Cash and Cash Equivalents	$	60,817	$	45,748
	Receivables, Net		832,989		792,822
	Unbilled Revenues		195,870		216,040
	Fuel, Materials and Supplies		239,226		267,713
	Regulatory Assets		625,542		705,025
	Marketable Securities		99,115		91,975
	Prepayments and Other Current Assets		104,452		107,972
Total Current Assets			2,158,011		2,227,295
Property, Plant and Equipment, Net			16,737,549		16,605,010
Deferred Debits and Other Assets:
	Regulatory Assets		5,015,108		5,132,411
	Goodwill		3,519,401		3,519,401
	Marketable Securities		492,003		400,329
	Derivative Assets		94,970		90,612
	Other Long-Term Assets		311,619		327,766
Total Deferred Debits and Other Assets			9,433,101		9,470,519
Total Assets		$	28,328,661	$	28,302,824
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

1

NORTHEAST UTILITIES AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
LIABILITIES AND CAPITALIZATION
Current Liabilities:
Notes Payable		$	1,287,000	$	1,120,196
Long-Term Debt - Current Portion			947,328		763,338
Accounts Payable			633,458		764,350
Regulatory Liabilities			191,707		134,115
Derivative Liabilities			108,964		117,194
Other Current Liabilities			671,180		744,497
Total Current Liabilities			3,839,637		3,643,690
Rate Reduction Bonds			19,610		82,139
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes			3,614,278		3,463,347
Regulatory Liabilities			531,546		540,162
Derivative Liabilities			840,043		882,654
Accrued Pension, SERP and PBOP			2,097,550		2,130,497
Other Long-Term Liabilities			873,637		967,561
Total Deferred Credits and Other Liabilities			7,957,054		7,984,221
Capitalization:
Long-Term Debt			7,011,561		7,200,156
Noncontrolling Interest - Preferred Stock of Subsidiaries			155,568		155,568
Equity:
	Common Shareholders' Equity:
	Common Shares		1,664,760		1,662,547
	Capital Surplus, Paid In		6,173,801		6,183,267
	Retained Earnings		1,914,371		1,802,714
	Accumulated Other Comprehensive Loss		(70,898)		(72,854)
	Treasury Stock		(336,803)		(338,624)
Common Shareholders' Equity			9,345,231		9,237,050
Total Capitalization			16,512,360		16,592,774
Total Liabilities and Capitalization		$	28,328,661	$	28,302,824
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

2

NORTHEAST UTILITIES AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
				For the Three Months Ended March 31,
(Thousands of Dollars, Except Share Information)				2013		2012
Operating Revenues				$	1,995,023	$	1,099,623
Operating Expenses:
	Purchased Power, Fuel and Transmission				747,809		395,344
	Operations and Maintenance				346,092		261,963
	Depreciation				154,977		80,839
	Amortization of Regulatory Assets, Net				54,049		5,426
	Amortization of Rate Reduction Bonds				34,499		18,347
	Energy Efficiency Programs				105,771		37,273
	Taxes Other Than Income Taxes				132,881		86,038
			Total Operating Expenses		1,576,078		885,230
Operating Income					418,945		214,393
Interest Expense:
	Interest on Long-Term Debt				85,295		59,968
	Interest on Rate Reduction Bonds				611		1,431
	Other Interest				(9,651)		5,048
			Interest Expense		76,255		66,447
Other Income, Net					7,765		8,773
Income Before Income Tax Expense					350,455		156,719
Income Tax Expense					120,487		55,964
Net Income					229,968		100,755
Net Income Attributable to Noncontrolling Interests					1,879		1,493
Net Income Attributable to Controlling Interest				$	228,089	$	99,262
Basic and Diluted Earnings Per Common Share				$	0.72	$	0.56
Dividends Declared Per Common Share				$	0.37	$	0.29
Weighted Average Common Shares Outstanding:
	Basic				315,129,782		178,055,716
	Diluted				316,002,538		178,437,453
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)
Net Income				$	229,968	$	100,755
Other Comprehensive Income, Net of Tax:
	Qualified Cash Flow Hedging Instruments				516		423
	Changes in Unrealized Gains/(Losses) on Other Securities				(181)		34
	Changes in Funded Status of Pension, SERP and PBOP
		Benefit Plans			1,621		1,407
Other Comprehensive Income, Net of Tax					1,956		1,864
Comprehensive Income Attributable to Noncontrolling Interests					(1,879)		(1,493)
Comprehensive Income Attributable to Controlling Interest				$	230,045	$	101,126
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

3

NORTHEAST UTILITIES AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Activities:
	Net Income		$	229,968	$	100,755
	Adjustments to Reconcile Net Income to Net Cash Flows
		Provided by Operating Activities:
		Depreciation		154,977		80,839
		Deferred Income Taxes		168,938		52,474
		Pension, SERP and PBOP Expense		53,102		42,268
		Pension and PBOP Contributions		(47,048)		(98,910)
		Regulatory Over/(Under) Recoveries, Net		39,218		(27,569)
		Amortization of Regulatory Assets, Net		54,049		5,426
		Amortization of Rate Reduction Bonds		34,499		18,347
		Proceeds from DOE Damages Claim		77,936		-
		Other		(51,106)		(5,484)
	Changes in Current Assets and Liabilities:
		Receivables and Unbilled Revenues, Net		(129,431)		29,276
		Fuel, Materials and Supplies		28,487		30,108
		Taxes Receivable/Accrued, Net		(21,295)		11,758
		Accounts Payable		(86,916)		(190,232)
		Other Current Assets and Liabilities, Net		(32,235)		(40,240)
Net Cash Flows Provided by Operating Activities				473,143		8,816
Investing Activities:
	Investments in Property, Plant and Equipment			(388,950)		(304,294)
	Proceeds from Sales of Marketable Securities			98,070		40,947
	Purchases of Marketable Securities			(184,030)		(41,570)
	Other Investing Activities			27,997		2,448
Net Cash Flows Used in Investing Activities				(446,913)		(302,469)
Financing Activities:
	Cash Dividends on Common Shares			(116,431)		(52,104)
	Cash Dividends on Preferred Stock			(1,879)		(1,390)
	(Decrease)/Increase in Short-Term Debt			(228,000)		343,000
	Issuance of Long-Term Debt			400,000		300,000
	Retirements of Rate Reduction Bonds			(62,529)		(17,903)
	Other Financing Activities			(2,322)		(1,130)
Net Cash Flows (Used in)/Provided by Financing Activities				(11,161)		570,473
Net Increase in Cash and Cash Equivalents				15,069		276,820
Cash and Cash Equivalents - Beginning of Period				45,748		6,559
Cash and Cash Equivalents - End of Period			$	60,817	$	283,379
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
ASSETS
Current Assets:
	Cash	$	8,307	$	1
	Receivables, Net		318,111		284,787
	Accounts Receivable from Affiliated Companies		2,942		6,641
	Unbilled Revenues		80,590		85,353
	Regulatory Assets		172,883		185,858
	Materials and Supplies		63,035		64,603
	Prepayments and Other Current Assets		47,906		26,413
Total Current Assets			693,774		653,656
Property, Plant and Equipment, Net			6,184,628		6,152,959
Deferred Debits and Other Assets:
	Regulatory Assets		2,141,137		2,158,363
	Derivative Assets		94,970		90,612
	Other Long-Term Assets		87,368		86,498
Total Deferred Debits and Other Assets			2,323,475		2,335,473
Total Assets		$	9,201,877	$	9,142,088
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

5

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
			March 31,		December 31,
(Thousands of Dollars)			2013		2012
LIABILITIES AND CAPITALIZATION
Current Liabilities:
	Notes Payable to Affiliated Companies		$	210,400	$	99,296
	Long-Term Debt - Current Portion			125,000		125,000
	Accounts Payable			196,526		262,857
	Accounts Payable to Affiliated Companies			31,968		52,326
	Obligations to Third Party Suppliers			67,833		67,344
	Accrued Taxes			53,383		60,109
	Regulatory Liabilities			42,324		32,119
	Derivative Liabilities			95,573		96,931
	Other Current Liabilities			102,094		125,662
Total Current Liabilities				925,101		921,644
Deferred Credits and Other Liabilities:
	Accumulated Deferred Income Taxes			1,401,609		1,336,105
	Regulatory Liabilities			110,688		124,319
	Derivative Liabilities			826,023		865,571
	Accrued Pension, SERP and PBOP			304,549		304,696
	Other Long-Term Liabilities			192,624		197,434
Total Deferred Credits and Other Liabilities				2,835,493		2,828,125
Capitalization:
	Long-Term Debt			2,740,614		2,737,790
Preferred Stock Not Subject to Mandatory Redemption				116,200		116,200
	Common Stockholder's Equity:
		Common Stock		60,352		60,352
		Capital Surplus, Paid In		1,640,566		1,640,149
		Retained Earnings		885,246		839,628
		Accumulated Other Comprehensive Loss		(1,695)		(1,800)
	Common Stockholder's Equity			2,584,469		2,538,329
Total Capitalization				5,441,283		5,392,319
Total Liabilities and Capitalization			$	9,201,877	$	9,142,088
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

6

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Revenues			$	624,097	$	591,965
Operating Expenses:
	Purchased Power and Transmission			229,259		220,891
	Operations and Maintenance			108,895		132,902
	Depreciation			42,448		41,070
	Amortization of Regulatory Assets, Net			10,787		7,994
	Energy Efficiency Programs			22,813		21,973
	Taxes Other Than Income Taxes			60,192		55,270
		Total Operating Expenses		474,394		480,100
Operating Income				149,703		111,865
Interest Expense:
	Interest on Long-Term Debt			32,635		31,521
	Other Interest			(2,941)		1,987
		Interest Expense		29,694		33,508
Other Income, Net				4,187		5,300
Income Before Income Tax Expense				124,196		83,657
Income Tax Expense				39,188		29,672
Net Income			$	85,008	$	53,985
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)
Net Income			$	85,008	$	53,985
Other Comprehensive Income, Net of Tax:
	Qualified Cash Flow Hedging Instruments			111		111
	Changes in Unrealized Gains/(Losses) on Other
		Securities		(6)		1
Other Comprehensive Income, Net of Tax				105		112
Comprehensive Income			$	85,113	$	54,097
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

7

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Activities:
	Net Income		$	85,008	$	53,985
	Adjustments to Reconcile Net Income to Net Cash Flows
		Provided by/(Used in) Operating Activities:
		Depreciation		42,448		41,070
		Deferred Income Taxes		65,475		32,460
		Pension, SERP and PBOP Expense, Net of PBOP Contributions		8,183		9,095
		Regulatory Underrecoveries, Net		(15,835)		(39,407)
		Amortization of Regulatory Assets, Net		10,787		7,994
		Other		3,653		(6,399)
	Changes in Current Assets and Liabilities:
		Receivables and Unbilled Revenues, Net		(32,041)		28,685
		Taxes Receivable/Accrued, Net		(12,777)		16,551
		Accounts Payable		(106,140)		(146,676)
		Other Current Assets and Liabilities, Net		(22,340)		(44,484)
Net Cash Flows Provided by/(Used in) Operating Activities				26,421		(47,126)
Investing Activities:
	Investments in Property, Plant and Equipment			(89,360)		(108,842)
	Other Investing Activities			447		1,139
Net Cash Flows Used in Investing Activities				(88,913)		(107,703)
Financing Activities:
	Cash Dividends on Common Stock			(38,000)		(33,495)
	Cash Dividends on Preferred Stock			(1,390)		(1,390)
	Issuance of Long Term Debt			400,000		-
	(Decrease)/Increase in Short-Term Debt			(283,700)		194,750
	Other Financing Activities			(6,112)		(1,200)
Net Cash Flows Provided by Financing Activities				70,798		158,665
Net Increase in Cash				8,306		3,836
Cash - Beginning of Period				1		1
Cash - End of Period			$	8,307	$	3,837
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

8

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
ASSETS
Current Assets:
	Cash and Cash Equivalents	$	17,109	$	13,695
	Receivables, Net		233,438		202,025
	Accounts Receivable from Affiliated Companies		303,699		160,176
	Unbilled Revenues		35,895		41,377
	Regulatory Assets		309,559		347,081
	Prepayments and Other Current Assets		42,425		28,086
Total Current Assets			942,125		792,440
Property, Plant and Equipment, Net			4,788,158		4,735,297
Deferred Debits and Other Assets:
	Regulatory Assets		1,489,317		1,444,870
	Other Long-Term Assets		57,036		87,382
Total Deferred Debits and Other Assets			1,546,353		1,532,252
Total Assets		$	7,276,636	$	7,059,989
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

9

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
			March 31,		December 31,
(Thousands of Dollars)			2013		2012
LIABILITIES AND CAPITALIZATION
Current Liabilities:
	Notes Payable		$	308,000	$	276,000
	Long-Term Debt - Current Portion			1,650		1,650
	Accounts Payable			205,738		168,611
	Accounts Payable to Affiliated Companies			353,037		247,061
	Accumulated Deferred Income Taxes - Current Portion			84,096		104,668
	Regulatory Liabilities			67,277		47,539
	Other Current Liabilities			148,360		144,433
Total Current Liabilities				1,168,158		989,962
Rate Reduction Bonds				-		43,493
Deferred Credits and Other Liabilities:
	Accumulated Deferred Income Taxes			1,365,951		1,321,026
	Regulatory Liabilities			248,376		244,224
	Accrued Pension			362,432		360,932
	Payable to Affiliated Companies			65,668		70,221
	Other Long-Term Liabilities			171,439		183,190
Total Deferred Credits and Other Liabilities				2,213,866		2,179,593
Capitalization:
	Long-Term Debt			1,600,950		1,600,911
Preferred Stock Not Subject to Mandatory Redemption				43,000		43,000
	Common Stockholder's Equity:
		Common Stock		-		-
		Capital Surplus, Paid In		992,625		992,625
		Retained Earnings		1,258,037		1,210,405
	Common Stockholder's Equity			2,250,662		2,203,030
Total Capitalization				3,894,612		3,846,941
Total Liabilities and Capitalization			$	7,276,636	$	7,059,989
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

10

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Revenues			$	592,257	$	556,476
Operating Expenses:
	Purchased Power and Transmission			214,053		219,010
	Operations and Maintenance			92,301		148,180
	Depreciation			45,441		42,529
	Amortization of Regulatory Assets, Net			46,994		23,880
	Amortization of Rate Reduction Bonds			15,054		22,581
	Energy Efficiency Programs			51,703		46,904
	Taxes Other Than Income Taxes			32,174		30,861
		Total Operating Expenses		497,720		533,945
Operating Income				94,537		22,531
Interest Expense:
	Interest on Long-Term Debt			19,592		22,288
	Interest on Rate Reduction Bonds			399		1,326
	Other Interest			(4,068)		(5,836)
		Interest Expense		15,923		17,778
Other Income, Net				773		1,222
Income Before Income Tax Expense				79,387		5,975
Income Tax Expense				31,265		2,035
Net Income			$	48,122	$	3,940
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

11

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Activities:
	Net Income		$	48,122	$	3,940
	Adjustments to Reconcile Net Income to Net Cash Flows
		Provided by Operating Activities:
		Bad Debt Expense		5,523		21,618
		Depreciation		45,441		42,529
		Deferred Income Taxes		26,571		(19,446)
		Pension and PBOP Expense, net of Pension and PBOP Contributions		6,420		16,997
		Regulatory (Under)/Over Recoveries, Net		(2,951)		24,719
		Amortization of Regulatory Assets, Net		46,994		23,880
		Amortization of Rate Reduction Bonds		15,054		22,581
		Other		(23,969)		(22,647)
	Changes in Current Assets and Liabilities:
		Receivables and Unbilled Revenues, Net		(174,978)		15,109
		Materials and Supplies		(7,060)		(9,340)
		Taxes Receivable/Accrued, Net		(22,501)		14,645
		Accounts Payable		107,843		(72,303)
		Other Current Assets and Liabilities, Net		18,916		34,223
Net Cash Flows Provided by Operating Activities				89,425		96,505
Investing Activities:
	Investments in Property, Plant and Equipment			(107,573)		(92,870)
	Decrease in Special Deposits			33,631		25,898
	Other Investing Activities			(86)		375
Net Cash Flows Used in Investing Activities				(74,028)		(66,597)
Financing Activities:
	Cash Dividends on Common Stock			-		(57,100)
	Cash Dividends on Preferred Stock			(490)		(490)
	Increase in Short-Term Debt			32,000		71,000
	Retirements of Rate Reduction Bonds			(43,493)		(43,548)
Net Cash Flows Used in Financing Activities				(11,983)		(30,138)
Net Increase/(Decrease) in Cash and Cash Equivalents				3,414		(230)
Cash and Cash Equivalents - Beginning of Period				13,695		9,373
Cash and Cash Equivalents - End of Period			$	17,109	$	9,143
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

12

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
ASSETS
Current Assets:
	Cash	$	3,376	$	2,493
	Receivables, Net		86,225		87,164
	Accounts Receivable from Affiliated Companies		7,568		723
	Unbilled Revenues		39,062		39,982
	Taxes Receivable		2,020		17,177
	Fuel, Materials and Supplies		94,783		95,345
	Regulatory Assets		62,184		62,882
	Prepayments and Other Current Assets		8,127		22,205
Total Current Assets			303,345		327,971
Property, Plant and Equipment, Net			2,360,753		2,352,515
Deferred Debits and Other Assets:
	Regulatory Assets		329,314		351,059
	Other Long-Term Assets		82,284		83,052
Total Deferred Debits and Other Assets			411,598		434,111
Total Assets		$	3,075,696	$	3,114,597
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

13

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
			March 31,		December 31,
(Thousands of Dollars)			2013		2012
LIABILITIES AND CAPITALIZATION
Current Liabilities:
	Notes Payable to Affiliated Companies		$	53,400	$	63,300
	Long-Term Debt - Current Portion			108,985		-
	Accounts Payable			64,619		62,864
	Accounts Payable to Affiliated Companies			12,624		21,337
	Accrued Interest			13,840		9,317
	Regulatory Liabilities			18,132		23,002
	Renewable Portfolio Standards Compliance Obligations			21,946		17,383
	Other Current Liabilities			43,941		41,633
Total Current Liabilities				337,487		238,836
Rate Reduction Bonds				14,974		29,294
Deferred Credits and Other Liabilities:
	Accumulated Deferred Income Taxes			449,979		441,577
	Regulatory Liabilities			52,473		52,418
	Accrued Pension, SERP and PBOP			186,836		220,129
	Other Long-Term Liabilities			45,972		47,896
Total Deferred Credits and Other Liabilities				735,260		762,020
Capitalization:
	Long-Term Debt			888,999		997,932
	Common Stockholder's Equity:
		Common Stock		-		-
		Capital Surplus, Paid In		701,241		701,052
		Retained Earnings		407,113		395,118
		Accumulated Other Comprehensive Loss		(9,378)		(9,655)
	Common Stockholder's Equity			1,098,976		1,086,515
Total Capitalization				1,987,975		2,084,447
Total Liabilities and Capitalization			$	3,075,696	$	3,114,597
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

14

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Revenues			$	273,829	$	242,997
Operating Expenses:
	Purchased Power, Fuel and Transmission			101,024		81,049
	Operations and Maintenance			59,729		64,979
	Depreciation			22,568		21,208
	Amortization of Regulatory Liabilities, Net			(3,051)		(2,622)
	Amortization of Rate Reduction Bonds			14,756		13,930
	Energy Efficiency Programs			3,669		3,581
	Taxes Other Than Income Taxes			17,016		15,486
		Total Operating Expenses		215,711		197,611
Operating Income				58,118		45,386
Interest Expense:
	Interest on Long-Term Debt			11,796		11,563
	Interest on Rate Reduction Bonds			85		1,016
	Other Interest			287		234
		Interest Expense		12,168		12,813
Other Income, Net				1,030		2,042
Income Before Income Tax Expense				46,980		34,615
Income Tax Expense				17,984		13,353
Net Income			$	28,996	$	21,262
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)
Net Income			$	28,996	$	21,262
Other Comprehensive Income, Net of Tax:
	Qualified Cash Flow Hedging Instruments			291		290
	Changes in Unrealized Gains/(Losses) on Other Securities			(11)		2
	Changes in Funded Status of Pension, SERP and PBOP
		Benefit Plans		(3)		-
Other Comprehensive Income, Net of Tax				277		292
Comprehensive Income			$	29,273	$	21,554
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

15

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Activities:
	Net Income		$	28,996	$	21,262
	Adjustments to Reconcile Net Income to Net Cash Flows
		Provided by Operating Activities:
		Depreciation		22,568		21,208
		Deferred Income Taxes		10,143		8,908
		Pension, SERP and PBOP Expense		8,022		7,032
		Pension and PBOP Contributions		(35,146)		(89,012)
		Regulatory (Under)/Over Recoveries, Net		(799)		911
		Amortization of Regulatory Liabilities, Net		(3,051)		(2,622)
		Amortization of Rate Reduction Bonds		14,756		13,930
		Other		(1,505)		9,569
	Changes in Current Assets and Liabilities:
		Receivables and Unbilled Revenues, Net		(13,889)		2,480
		Fuel, Materials and Supplies		562		9,361
		Taxes Receivable/Accrued, Net		23,137		10,138
		Accounts Payable		31,257		(16,073)
		Other Current Assets and Liabilities, Net		22,152		18,869
Net Cash Flows Provided by Operating Activities				107,203		15,961
Investing Activities:
	Investments in Property, Plant and Equipment			(64,956)		(67,059)
	Decrease in NU Money Pool Lending			-		55,900
	Other Investing Activities			(17)		963
Net Cash Flows Used in Investing Activities				(64,973)		(10,196)
Financing Activities:
	Cash Dividends on Common Stock			(17,000)		(42,891)
	(Decrease)/Increase in Short-Term Debt			(9,900)		52,900
	Retirements of Rate Reduction Bonds			(14,320)		(13,463)
	Other Financing Activities			(127)		(116)
Net Cash Flows Used in Financing Activities				(41,347)		(3,570)
Net Increase in Cash				883		2,195
Cash - Beginning of Period				2,493		56
Cash - End of Period			$	3,376	$	2,251
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

16

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
		March 31,		December 31,
(Thousands of Dollars)		2013		2012
ASSETS
Current Assets:
	Cash	$	1,768	$	1
	Receivables, Net		48,113		47,297
	Accounts Receivable from Affiliated Companies		154		164
	Unbilled Revenues		16,071		16,192
	Taxes Receivable		3		15,513
	Regulatory Assets		43,534		42,370
	Marketable Securities		30,588		27,352
	Prepayments and Other Current Assets		7,571		7,963
Total Current Assets			147,802		156,852
Property, Plant and Equipment, Net			1,305,743		1,290,498
Deferred Debits and Other Assets:
	Regulatory Assets		207,901		221,752
	Marketable Securities		27,169		30,342
	Other Long-Term Assets		24,018		23,625
Total Deferred Debits and Other Assets			259,088		275,719
Total Assets		$	1,712,633	$	1,723,069
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

17

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited)
			March 31,		December 31,
(Thousands of Dollars)			2013		2012
LIABILITIES AND CAPITALIZATION
Current Liabilities:
	Notes Payable to Affiliated Companies		$	43,400	$	31,900
	Long-Term Debt - Current Portion			55,000		55,000
	Accounts Payable			44,303		68,141
	Accounts Payable to Affiliated Companies			3,061		7,103
	Accrued Interest			1,918		8,304
	Regulatory Liabilities			15,638		21,037
	Other Current Liabilities			32,756		24,909
Total Current Liabilities				196,076		216,394
Rate Reduction Bonds				4,636		9,352
Deferred Credits and Other Liabilities:
	Accumulated Deferred Income Taxes			316,727		303,111
	Regulatory Liabilities			9,736		9,686
	Accrued Pension, SERP and PBOP			35,431		36,099
	Other Long-Term Liabilities			33,203		40,148
Total Deferred Credits and Other Liabilities				395,097		389,044
Capitalization:
	Long-Term Debt			550,057		550,270
	Common Stockholder's Equity:
		Common Stock		10,866		10,866
		Capital Surplus, Paid In		390,485		390,412
		Retained Earnings		169,179		160,577
		Accumulated Other Comprehensive Loss		(3,763)		(3,846)
	Common Stockholder's Equity			566,767		558,009
Total Capitalization				1,116,824		1,108,279
Total Liabilities and Capitalization			$	1,712,633	$	1,723,069
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

18

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Revenues			$	124,953	$	114,025
Operating Expenses:
	Purchased Power and Transmission			40,044		40,554
	Operations and Maintenance			20,928		22,601
	Depreciation			8,970		7,697
	Amortization of Regulatory Assets/(Liabilities), Net			129		(343)
	Amortization of Rate Reduction Bonds			4,689		4,418
	Energy Efficiency Programs			8,315		5,556
	Taxes Other Than Income Taxes			6,288		4,882
		Total Operating Expenses		89,363		85,365
Operating Income				35,590		28,660
Interest Expense:
	Interest on Long-Term Debt			5,955		5,766
	Interest on Rate Reduction Bonds			127		415
	Other Interest			211		214
		Interest Expense		6,293		6,395
Other Income, Net				1,004		1,092
Income Before Income Tax Expense				30,301		23,357
Income Tax Expense				11,698		9,171
Net Income			$	18,603	$	14,186
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(Unaudited)
Net Income			$	18,603	$	14,186
Other Comprehensive Income, Net of Tax:
	Qualified Cash Flow Hedging Instruments			85		85
	Changes in Unrealized Gains/(Losses) on Other Securities			(2)		-
Other Comprehensive Income, Net of Tax				83		85
Comprehensive Income			$	18,686	$	14,271
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

19

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited)
			For the Three Months Ended March 31,
(Thousands of Dollars)			2013		2012
Operating Activities:
	Net Income		$	18,603	$	14,186
	Adjustments to Reconcile Net Income to Net Cash Flows
		Provided by Operating Activities:
		Depreciation		8,970		7,697
		Deferred Income Taxes		16,828		9,198
		Pension, SERP and PBOP Expense, Net of PBOP Contributions		1,246		1,766
		Regulatory Underrecoveries, Net		(2,357)		(1,778)
		Amortization of Regulatory Assets/(Liabilities), Net		129		(343)
		Amortization of Rate Reduction Bonds		4,689		4,418
		Other		(2,545)		(1,071)
	Changes in Current Assets and Liabilities:
		Receivables and Unbilled Revenues, Net		(4,907)		(2,274)
		Taxes Receivable/Accrued, Net		21,600		1,051
		Accounts Payable		17,667		(21,870)
		Other Current Assets and Liabilities, Net		(8,931)		(5,885)
Net Cash Flows Provided by Operating Activities				70,992		5,095
Investing Activities:
	Investments in Property, Plant and Equipment			(66,340)		(85,011)
	Proceeds from Sales of Marketable Securities			21,035		31,579
	Purchases of Marketable Securities			(21,191)		(31,680)
	Decrease in NU Money Pool Lending			-		11,000
	Other Investing Activities			500		(169)
Net Cash Flows Used in Investing Activities				(65,996)		(74,281)
Financing Activities:
	Cash Dividends on Common Stock			(10,000)		(9,432)
	Increase in Short-Term Debt			11,500		83,200
	Retirement of Rate Reduction Bonds			(4,716)		(4,440)
	Other Financing Activities			(13)		(17)
Net Cash Flows (Used in)/Provided by Financing Activities				(3,229)		69,311
Net Increase in Cash				1,767		125
Cash - Beginning of Period				1		1
Cash - End of Period			$	1,768	$	126
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

20

NORTHEAST UTILITIES AND SUBSIDIARIES

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY

COMBINED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

Refer to the Glossary of Terms included in this combined Quarterly Report on Form 10-Q for abbreviations and acronyms used throughout the combined notes to the unaudited condensed consolidated financial statements.

1.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A.

Basis of Presentation

NU is a public utility holding company primarily engaged through its wholly owned regulated utility subsidiaries in the energy delivery business.  On April 10, 2012, NU acquired 100 percent of the outstanding common shares of NSTAR and NSTAR (through a successor, NSTAR LLC) became a direct wholly owned subsidiary of NU.  NU's wholly owned regulated utility subsidiaries include CL&P, NSTAR Electric, PSNH, WMECO, Yankee Gas and NSTAR Gas.  NU provides energy delivery service to approximately 3.6 million electric and natural gas customers through six regulated utilities in Connecticut, Massachusetts and New Hampshire.  NU's consolidated financial information does not include NSTAR and its subsidiaries' results of operations for the three months ended March 31, 2012.  NSTAR Electric continues to maintain reporting requirements as an SEC registrant.  The information disclosed for NSTAR Electric represents its results of operations for the three months ended March 31, 2013 and 2012, presented on a comparable basis.

The accompanying unaudited condensed consolidated financial statements of NU, CL&P, NSTAR Electric, PSNH and WMECO include the accounts of each of their respective subsidiaries and are herein referred to as “consolidated financial statements.”  Intercompany transactions have been eliminated in consolidation.  

The combined notes to consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC.  Certain information and footnote disclosures included in annual consolidated financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations.  The accompanying consolidated financial statements should be read in conjunction with the entirety of this combined Quarterly Report on Form 10-Q and the 2012 combined Annual Report on Form 10-K of NU, CL&P, NSTAR Electric, PSNH and WMECO (NU 2012 Form 10-K), which was filed with the SEC.  The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.

The consolidated financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly NU’s and the above companies’ financial positions as of March 31, 2013 and December 31, 2012 and the results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012.  The results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012 are not necessarily indicative of the results expected for a full year.  The demand for electricity and natural gas is affected by weather conditions, economic conditions, and consumer conservation behavior.  Electric energy sales and revenues are typically higher in the winter and summer months than in the spring and fall months.  Natural gas sales and revenues are typically higher in the winter months than during other periods of the year.

NU consolidates CYAPC and YAEC as CL&P’s, NSTAR Electric’s, PSNH’s and WMECO’s combined ownership interest in each of these entities is greater than 50 percent.  Intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and the CYAPC and YAEC companies have been eliminated in consolidation.  For CL&P, NSTAR Electric, PSNH and WMECO, the investment in CYAPC and YAEC continue to be accounted for under the equity method.

NU's utility subsidiaries are subject to the application of accounting guidance for entities with rate-regulated operations that considers the effect of regulation resulting from differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries.  NU's utility subsidiaries' energy delivery business is subject to rate-regulation that is based on cost recovery and meets the criteria for application of rate-regulated accounting.  See Note 2, "Regulatory Accounting," for further information.

Certain prior period amounts in NSTAR Electric's accompanying consolidated statements of income and cash flows have been reclassified between line items for comparative purposes and in order to conform to NU's presentation.  The reclassifications did not affect NSTAR Electric's net income.  

The NSTAR Electric consolidated statement of cash flows was revised to correct an error in the presentation of cash deposits related to the RRBs. The impact of this revision was an increase in investing cash inflows from Other Investing Activities in an amount of $24.8 million and a corresponding increase to financing cash outflows from Retirements of Rate Reduction Bonds for the three months ended March 31, 2012.  This revision had no impact on NSTAR Electric’s results of operations or cash balance and is not deemed material, individually or in the aggregate, to the previously issued consolidated financial statements.

21

Certain changes in classification and corresponding reclassifications of prior period data were made in the accompanying consolidated statements of income and statements of cash flows for NU, CL&P, PSNH and WMECO for comparative purposes to conform to the current period presentation.  The consolidated statement of income reflects the reclassification of transmission expenses from Other Operating Expenses, as originally reported, to Purchased Power, Fuel and Transmission and the reclassification of energy efficiency expenses primarily from Other Operating Expenses, as originally reported, to Energy Efficiency Programs.  In addition, Other Operating Expenses and Maintenance, as originally reported, were combined and are reported in aggregate as Operations and Maintenance.  The reclassifications on the statement of income were as follows:

	For the Three Months Ended March 31, 2012
(Millions of Dollars)	Transmission Expense		Energy Efficiency Expense
NU	$	(2.7)	$	37.3
CL&P		(2.9)		22.0
PSNH		7.9		3.6
WMECO		1.0		5.6

Effective January 1, 2012, NSTAR Electric changed its estimates with respect to the allowance for doubtful accounts, incurred but not reported claims on medical benefits, general and workers' compensation liabilities and compensation accruals.  The total aggregate impact of these changes in estimates on NSTAR Electric's accompanying consolidated statement of income was a decrease to net income of $11.4 million, after-tax, for the three months ended March 31, 2012.  

NU evaluates events and transactions that occur after the balance sheet date but before financial statements are issued and recognizes in the financial statements the effects of all subsequent events that provide additional evidence about conditions that existed as of the balance sheet date and discloses, but does not recognize, in the financial statements subsequent events that provide evidence about the conditions that arose after the balance sheet date but before the financial statements are issued.  See Note 6, "Short-Term and Long-Term Debt," for further information.

B.

Recently Adopted Accounting Standards

In the first quarter of 2013, NU adopted the following Financial Accounting Standards Board’s (FASB) final Accounting Standards Updates (ASU) relating to additional disclosure requirements:

·

Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income Requires entities to disclose additional information about items reclassified out of AOCI.  The ASU does not change existing guidance on which items should be reclassified out of AOCI but requires disclosures about the components of AOCI and the amount of reclassification adjustments to be presented in one location.  The ASU is effective beginning in the first quarter of 2013 and is applied prospectively.  For further information, see Note 11, “Accumulated Other Comprehensive Income/(Loss),” to the consolidated financial statements.  The ASU did not affect the calculation of net income, comprehensive income or EPS and did not have an impact on financial position, results of operations or cash flows.

·

Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities Clarifies the scope of the offsetting disclosure requirements under GAAP.  The disclosure requirements apply to derivative instruments, do not change existing guidance on which items should be offset in the balance sheets and require disclosures about the items that are offset. The ASU is effective beginning in the first quarter of 2013 with retrospective application.  For further information, see Note 4, “Derivative Instruments,” to the consolidated financial statements. The ASU did not have an impact on financial position, results of operations or cash flows.  

C.

Provision for Uncollectible Accounts

NU, including CL&P, NSTAR Electric, PSNH and WMECO, presents its receivables at net realizable value by maintaining a provision for uncollectible amounts.  This provision is determined based upon a variety of factors, including applying an estimated uncollectible account percentage to each receivable aging category, based upon historical collection and write-off experience and management's assessment of collectibility from individual customers.  Management assesses the collectibility of receivables, and if circumstances change, collectibility estimates are adjusted accordingly.  Receivable balances are written off against the provision for uncollectible accounts when the accounts are terminated and these balances are deemed to be uncollectible.

The provision for uncollectible accounts, which is included in Receivables, Net on the consolidated balance sheets, was as follows:

(Millions of Dollars)	As of March 31, 2013		As of December 31, 2012
NU	$	178.6	$	165.5
CL&P		85.0		77.6
NSTAR Electric		44.8		44.1
PSNH		7.4		6.8
WMECO		9.0		8.5

D.

Restricted Cash and Other Deposits

As of March 31, 2013, NU, CL&P and PSNH had $3.8 million, $1.4 million and $1.7 million, respectively, of restricted cash, primarily relating to amounts held in escrow, insurance proceeds on bondable property at PSNH and amounts related to the sale of land, which were included in Prepayments and Other Current Assets on the consolidated balance sheets.  As of December 31, 2012, these amounts were $3.3 million, $1.3 million and $1.7 million for NU, CL&P and PSNH, respectively.

22

As of March 31, 2013, NU had $12.8 million of cash collateral posted not subject to master netting agreements.  As of December 31, 2012, this amount was $14.6 million.

E.

Fair Value Measurements

NU, including CL&P, NSTAR Electric, PSNH, and WMECO, applies fair value measurement guidance to derivative contracts recorded at fair value and to the marketable securities held in the NU supplemental benefit trust, WMECO's spent nuclear fuel trust and CYAPC's and YAEC's nuclear decommissioning trusts.  Fair value measurement guidance is also applied to investment valuations used to calculate the funded status of NU's Pension and PBOP Plans, including NSTAR Electric's Pension Plan, and nonrecurring fair value measurements of nonfinancial assets such as goodwill and AROs.  

Fair Value Hierarchy:  In measuring fair value, NU uses observable market data when available and minimizes the use of unobservable inputs.  Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes.  The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement.  NU evaluates the classification of assets and liabilities measured at fair value on a quarterly basis, and NU's policy is to recognize transfers between levels of the fair value hierarchy as of the end of the reporting period.  The three levels of the fair value hierarchy are described below:

Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date.  Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.  

Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable.

Level 3 - Quoted market prices are not available.  Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable.  Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products.  

Determination of Fair Value:  The valuation techniques and inputs used in NU's fair value measurements are described in Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to the consolidated financial statements.

F.

Other Income, Net

Items included within Other Income, Net on the consolidated statements of income primarily consist of investment income/(loss), interest income, AFUDC related to equity funds and equity in earnings.  For CL&P, NSTAR Electric, PSNH and WMECO, equity in earnings relate to investments in CYAPC, YAEC and MYAPC and also NSTAR Electric's investment in two regional transmission companies, which are all accounted for on the equity method.  On an NU consolidated basis, equity in earnings relate to the investment in MYAPC and NU's investment in two regional transmission companies.  

G.

Other Taxes

Gross receipts taxes levied by the state of Connecticut are collected by CL&P and Yankee Gas from their respective customers.  These gross receipts taxes are shown on a gross basis with collections in Operating Revenues and payments in Taxes Other Than Income Taxes on the consolidated statements of income as follows:

	For the Three Months Ended
(Millions of Dollars)	March 31, 2013		March 31, 2012
NU	$	38.4	$	35.0
CL&P		32.0		29.4

Certain sales taxes are also collected by CL&P, NSTAR Electric and WMECO from their respective customers as agents for state and local governments and are recorded on a net basis with no impact on the consolidated statements of income.   

H.	Supplemental Cash Flow Information
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)		As of March 31, 2013		As of March 31, 2012
NU		$	98.7	$	138.5
CL&P			28.2		36.6
NSTAR Electric (1)			30.7		29.5
PSNH			12.9		32.5
WMECO			15.8		56.6
(1)  NSTAR Electric amounts are not included in NU consolidated as of March 31, 2012.

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2.

REGULATORY ACCOUNTING

The rates charged to the customers of NU's Regulated companies are designed to collect the companies' costs to provide service, including a return on investment.  Therefore, the accounting policies of the Regulated companies apply GAAP applicable to rate-regulated enterprises and reflect the effects of the rate-making process.  

Management believes it is probable that the Regulated companies will recover their respective investments in long-lived assets, including regulatory assets.  If management determined that it could no longer apply the accounting guidance applicable to rate-regulated enterprises to any of the Regulated companies' operations, or that management could not conclude it is probable that costs would be recovered in future rates, the costs would be charged to net income in the period in which the determination is made.

Regulatory Assets:  The components of regulatory assets are as follows:

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Benefit Costs	$	2,390.4	$	2,452.1
Regulatory Assets Offsetting Derivative Liabilities		835.0		885.6
Goodwill		532.5		537.6
Storm Restoration Costs		656.1		547.7
Income Taxes, Net		521.7		516.2
Securitized Assets		157.6		232.6
Contractual Obligations		124.9		217.6
Power Contracts Buy Out Agreements		87.3		92.9
Regulatory Tracker Deferrals		177.2		190.1
Asset Retirement Obligations		90.2		88.8
Other Regulatory Assets		67.7		76.2
Total Regulatory Assets		5,640.6		5,837.4
Less:  Current Portion		625.5		705.0
Total Long-Term Regulatory Assets	$	5,015.1	$	5,132.4

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Benefit Costs		$	546.9	$	769.0	$	217.2	$	112.6	$	563.2	$	781.2	$	223.7	$	116.0
Regulatory Assets Offsetting
	Derivative Liabilities		819.6		13.6		-		1.8		866.2		14.9		-		3.0
Goodwill			-		457.2		-		-		-		461.5		-		-
Storm Restoration Costs			448.7		132.7		32.3		42.4		413.9		55.8		34.5		43.5
Income Taxes, Net			371.7		46.7		37.3		31.1		367.5		47.1		36.2		31.0
Securitized Assets			-		149.5		5.0		3.1		-		205.1		19.7		7.8
Contractual Obligations			59.7		20.9		-		13.7		64.0		22.8		-		14.9
Power Contracts Buy Out Agreements			-		80.7		6.6		-		-		85.9		7.0		-
Regulatory Tracker Deferrals			10.1		84.5		49.7		31.3		12.2		71.4		49.3		31.9
Asset Retirement Obligations			30.0		29.8		14.3		3.6		29.4		29.4		14.2		3.5
Other Regulatory Assets			27.3		14.3		29.1		11.8		27.9		16.9		29.4		12.6
Total Regulatory Assets			2,314.0		1,798.9		391.5		251.4		2,344.3		1,792.0		414.0		264.2
Less:  Current Portion			172.9		309.6		62.2		43.5		185.9		347.1		62.9		42.4
Total Long-Term Regulatory Assets		$	2,141.1	$	1,489.3	$	329.3	$	207.9	$	2,158.4	$	1,444.9	$	351.1	$	221.8

Storm Restoration Costs:  The storm restoration cost deferrals relate to costs incurred at CL&P, NSTAR Electric, PSNH and WMECO that each company expects to collect from customers.  A storm must meet certain criteria specific to each state and utility company to be declared a major storm.  Once a storm is declared major, all qualifying expenses incurred during storm restoration efforts, if deemed prudent, are deferred and recovered from customers in future periods.  In Connecticut, qualifying storm restoration costs must exceed $5 million for a storm to be declared a major storm.  In Massachusetts, qualifying storm restoration costs must exceed $1 million for NSTAR Electric and $300,000 for WMECO and an emergency response plan must be initiated for a storm to be declared a major storm.  In New Hampshire, (1) at least 10 percent of customers must be without power with at least 200 concurrent locations requiring repairs (trouble spots), or (2) at least 300 concurrent trouble spots must be reported for a storm to be declared a major storm.  In addition, PSNH is permitted to defer pre-staging costs for storms that may not ultimately qualify as a major storm.

On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric.  This blizzard resulted in estimated deferred storm restoration costs of approximately $13 million at CL&P and approximately $80 million at NSTAR Electric.  On January 31, 2013, a major storm caused damage to CL&P's electric delivery system, which resulted in estimated deferred storm restoration costs of approximately $19 million. Management believes these storm restoration costs meet the criteria for specific cost recovery in Connecticut and Massachusetts and, as a result, are probable of recovery.  Therefore, management does not expect these storms to have a material impact on CL&P's or NSTAR Electric’s results of operations.  CL&P and NSTAR Electric will seek recovery of these deferred storm restoration costs through their applicable regulatory recovery process.

Regulatory Costs Not Yet Approved:  The Regulated companies had $78.8 million ($3.7 million for CL&P, $26.3 million for NSTAR Electric, $37.2 million for PSNH, and $6 million for WMECO) and $69.9 million ($3.9 million for CL&P, $25.4 million for NSTAR Electric, $35.7 million for PSNH, and $1.4 million for WMECO) of regulatory costs as of March 31, 2013 and December 31, 2012, respectively,

24

which were included in Other Long-Term Assets on the consolidated balance sheets.  These amounts represent incurred costs that have not yet been approved for recovery by the applicable regulatory agency.  Management believes it is probable that these costs will ultimately be approved and recovered from customers.

Regulatory Liabilities:  The components of regulatory liabilities are as follows:

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Cost of Removal	$	441.3	$	440.8
Regulatory Tracker Deferrals		147.0		95.1
AFUDC Transmission Incentive		68.9		70.0
Spent Nuclear Fuel Costs and Contractual Obligations		15.4		15.4
Other Regulatory Liabilities		50.6		53.0
Total Regulatory Liabilities		723.2		674.3
Less:  Current Portion		191.7		134.1
Total Long-Term Regulatory Liabilities	$	531.5	$	540.2

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Cost of Removal		$	39.3	$	244.5	$	51.3	$	-	$	44.2	$	240.3	$	51.2	$	-
Regulatory Tracker Deferrals			39.1		37.3		13.8		12.5		39.1		14.4		20.4		13.7
AFUDC Transmission Incentive			55.5		4.1		-		9.3		56.6		4.1		-		9.3
Spent Nuclear Fuel Costs and
	Contractual Obligations		15.4		-		-		-		15.4		-		-		-
Wholesale Transmission Overcollections			2.3		-		1.1		0.9		-		-		-		5.3
Other Regulatory Liabilities			1.4		29.8		4.4		2.6		1.1		32.9		3.8		2.4
Total Regulatory Liabilities			153.0		315.7		70.6		25.3		156.4		291.7		75.4		30.7
Less:  Current Portion			42.3		67.3		18.1		15.6		32.1		47.5		23.0		21.0
Total Long-Term Regulatory Liabilities		$	110.7	$	248.4	$	52.5	$	9.7	$	124.3	$	244.2	$	52.4	$	9.7

3.

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize the NU, CL&P, NSTAR Electric, PSNH and WMECO investments in utility property, plant and equipment by asset category:

		As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)		NU		NU
Distribution - Electric		$	11,504.0	$	11,438.2
Distribution - Natural Gas			2,290.8		2,274.2
Transmission			5,721.2		5,541.1
Generation			1,146.7		1,146.6
Electric and Natural Gas Utility			20,662.7		20,400.1
Other (1)			503.0		429.3
Property, Plant and Equipment, Gross			21,165.7		20,829.4
Less:  Accumulated Depreciation
	Electric and Natural Gas Utility		(5,157.7)		(5,065.1)
	Other		(178.5)		(171.5)
Total Accumulated Depreciation			(5,336.2)		(5,236.6)
Property, Plant and Equipment, Net			15,829.5		15,592.8
Construction Work in Progress			908.0		1,012.2
Total Property, Plant and Equipment, Net		$	16,737.5	$	16,605.0

⁽¹⁾

These assets represent unregulated property and are primarily comprised of building improvements at RRR, software and equipment at NUSCO and telecommunications equipment at NSTAR Communications, Inc.

	As of March 31, 2013								As of December 31, 2012
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Distribution	$	4,724.3	$	4,552.0	$	1,535.7	$	730.0	$	4,691.3	$	4,539.9	$	1,520.1	$	724.2
Transmission		2,874.6		1,542.8		602.3		656.7		2,796.1		1,529.7		599.2		583.7
Generation		-		-		1,125.6		21.1		-		-		1,125.5		21.1
Property, Plant and
Equipment, Gross		7,598.9		6,094.8		3,263.6		1,407.8		7,487.4		6,069.6		3,244.8		1,329.0
Less:  Accumulated Depreciation		(1,727.5)		(1,573.2)		(968.4)		(257.5)		(1,698.1)		(1,540.1)		(954.0)		(252.1)
Property, Plant and Equipment, Net		5,871.4		4,521.6		2,295.2		1,150.3		5,789.3		4,529.5		2,290.8		1,076.9
Construction Work in Progress		313.2		266.6		65.6		155.4		363.7		205.8		61.7		213.6
Total Property, Plant and
Equipment, Net	$	6,184.6	$	4,788.2	$	2,360.8	$	1,305.7	$	6,153.0	$	4,735.3	$	2,352.5	$	1,290.5

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4.

DERIVATIVE INSTRUMENTS

The Regulated companies purchase and procure energy and energy-related products for their customers, which are subject to price volatility.  The costs associated with supplying energy to customers are recoverable through customer rates.  The Regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative contracts, many of which meet the definition of and are designated as "normal purchases or normal sales" (normal) under the applicable accounting guidance, and the use of nonderivative contracts.

Derivative contracts that are not recorded as normal are recorded at fair value as current or long-term derivative assets or liabilities.  For the Regulated companies, regulatory assets or liabilities are recorded for the changes in fair values of derivatives, as costs are, and management believes they will continue to be, recovered from or refunded in customer rates.  For NU's remaining unregulated wholesale marketing contracts, changes in fair values of derivatives are included in Net Income.  The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses or Operating Revenues on the consolidated statements of income, as applicable, as electricity or natural gas is delivered.

CL&P, NSTAR Electric and WMECO mitigate the risks associated with the price volatility of energy and energy-related products through the use of SS, LRS, and basic service contracts, which fix the price of electricity purchased for customers and are accounted for as normal.  CL&P, NSTAR Electric and WMECO have entered into derivative and nonderivative contracts for the purchase of energy and energy-related products and contracts that are derivatives.  NU also has NYMEX future contracts in order to reduce variability associated with the purchase price of approximately 5.2 million MMBtu of natural gas.  

The costs or benefits from all of the Regulated companies' derivative contracts are recoverable from or refundable to customers, and therefore, changes in fair value are recorded as Regulatory Assets or Regulatory Liabilities on the consolidated balance sheets.

The gross fair values of derivative assets and liabilities with the same counterparty are offset and reported as net Derivative Assets or Derivative Liabilities, with current and long-term portions, in the consolidated balance sheets.  Cash collateral posted or collected under master netting agreements is recorded as an offset to the derivative asset or liability.  The following tables present the gross fair values of contracts categorized by risk type and the net amounts recorded as current or long-term derivative asset or liability:     

		As of March 31, 2013
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other (1)	$	1.6	$	-	$	1.6
Level 3:
	CL&P (1)		17.5		(10.5)		7.0
	Other		1.9		-		1.9
Total Current Derivative Assets		$	21.0	$	(10.5)	$	10.5
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	152.3	$	(57.3)	$	95.0
Total Long-Term Derivative Assets		$	152.3	$	(57.3)	$	95.0
Current Derivative Liabilities:
Level 2:
	Other (1) (3)	$	(12.0)	$	-	$	(12.0)
Level 3:
	CL&P		(95.6)		-		(95.6)
	NSTAR Electric		(1.3)		-		(1.3)
	WMECO		(0.1)		-		(0.1)
Total Current Derivative Liabilities		$	(109.0)	$	-	$	(109.0)
Long-Term Derivative Liabilities:
Level 3:
	CL&P	$	(826.0)	$	-	$	(826.0)
	NSTAR Electric		(12.3)		-		(12.3)
	WMECO		(1.7)		-		(1.7)
Total Long-Term Derivative Liabilities		$	(840.0)	$	-	$	(840.0)

26

		As of December 31, 2012
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting  (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other  (1)	$	0.2	$	-	$	0.2
Level 3:
	CL&P (1)		17.7		(12.0)		5.7
	Other		5.5		-		5.5
Total Current Derivative Assets		$	23.4	$	(12.0)	$	11.4
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	159.7	$	(69.1)	$	90.6
Total Long-Term Derivative Assets		$	159.7	$	(69.1)	$	90.6
Current Derivative Liabilities:
Level 2:
	Other (1), (3)	$	(19.9)	$	0.6	$	(19.3)
Level 3:
	CL&P		(96.9)		-		(96.9)
	NSTAR Electric		(1.0)		-		(1.0)
Total Current Derivative Liabilities		$	(117.8)	$	0.6	$	(117.2)
Long-Term Derivative Liabilities:
Level 2:
	Other (1)	$	(0.2)	$	-	$	(0.2)
Level 3:
	CL&P		(865.6)		-		(865.6)
	NSTAR Electric		(13.9)		-		(13.9)
	WMECO		(3.0)		-		(3.0)
Total Long-Term Derivative Liabilities		$	(882.7)	$	-	$	(882.7)

⁽¹⁾

Amounts represent derivative assets and liabilities which NU has elected to record net on the consolidated balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.

⁽²⁾

Current derivative assets are included in Prepayments and Other Current Assets on the consolidated balance sheets.  NSTAR Electric and WMECO derivative liabilities are included in Other Current Liabilities and Other Long-Term Liabilities on the consolidated balance sheets.  

⁽³⁾

As of March 31, 2013 and December 31, 2012, NU had $3.5 million and $4.1 million, respectively, of cash posted related to these contracts, which is not offset against the derivative liability and is recorded as Prepayments and Other Current Assets on the consolidated balance sheets.

For further information on the fair value of derivative contracts, see Note 1E, "Summary of Significant Accounting Policies - Fair Value Measurements," to the consolidated financial statements.

Derivatives Not Designated as Hedges

Commodity Supply and Price Risk Management:  As required by regulation, CL&P has capacity-related contracts with generation facilities.  These contracts and similar UI contracts have an expected capacity of 787 MW.  CL&P has a sharing agreement with UI, with 80 percent of each contract allocated to CL&P and 20 percent allocated to UI.  The capacity contracts extend through 2026 and obligate the utilities to make or receive payments on a monthly basis to or from the generation facilities based on the difference between a set capacity price and the forward capacity market price received in the ISO-NE capacity markets.  In addition, CL&P has a contract to purchase 0.1 million MWh of energy per year through 2020.  

NSTAR Electric has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2018.  NSTAR Electric also has a capacity related contract for up to 35 MW per year that extends through 2019.

WMECO has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2028 with a facility that is expected to achieve commercial operation by November 2013.  

As of March 31, 2013 and December 31, 2012, NU had approximately 5 thousand MWh and 24 thousand MWh, respectively, of supply volumes remaining in its unregulated wholesale portfolio when expected sales are compared with supply contracts.

27

The following table presents the realized and unrealized gains/(losses) associated with NU’s derivative contracts not designated as hedges (See Level 3 tables in the "Valuations using significant unobservable inputs" section for CL&P, NSTAR Electric and WMECO gains and losses on derivative contracts):

Location of Amounts		Amounts Recognized on Derivatives
Recognized on Derivatives		For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012
NU
Balance Sheet:
	Regulatory Assets	$	28.0	$	6.0
Statement of Income:
	Purchased Power, Fuel and Transmission		0.3		(0.8)

Hedging

Fair Value Hedge:  NU parent had a fixed to floating interest rate swap on its $263 million, fixed rate senior note that matured on April 1, 2012.  This interest rate swap qualified and was designated as a fair value hedge.  Prior to the settlement of the swap on April 2, 2012, $2.5 million of interest benefit was recorded in Net Income in the first quarter of 2012.  

Cash Flow Hedges:  For information on the treatment of previously settled cash flow hedges, see Note 11, "Accumulated Other Comprehensive Income/(Loss)," to the consolidated financial statements.

Credit Risk

Certain of NU’s derivative contracts contain credit risk contingent features.  These features require NU to maintain investment grade credit ratings from the major rating agencies and to post collateral for contracts in a net liability position over specified credit limits.  The following summarizes the fair value of derivative contracts that were in a net liability position and subject to credit risk contingent features, the fair value of cash collateral, and the additional collateral that would be required to be posted by NU if the unsecured debt credit ratings of NU parent were downgraded to below investment grade as of March 31, 2013 and December 31, 2012:

As of March 31, 2013

As of December 31, 2012

Additional Collateral

Additional Collateral

Fair Value Subject

Required if

Fair Value Subject

Required if

to Credit Risk

Cash

Downgraded Below

to Credit Risk

Cash

Downgraded Below

(Millions of Dollars)

Contingent Features

Collateral Posted

Investment Grade

Contingent Features

Collateral Posted

Investment Grade

NU

$

(8.4)

$

-

$

9.4

$

(15.3)

$

-

$

17.4

Fair Value Measurements of Derivative Instruments

Valuation of Derivative Instruments:  Derivative contracts classified as Level 2 in the fair value hierarchy relate to the financial contracts for natural gas futures and the remaining unregulated wholesale marketing sourcing contracts to purchase energy for periods in which prices are quoted in an active market.  Prices are obtained from broker quotes and are based on actual market activity.  The contracts are valued using the mid-point of the bid-ask spread.  Valuations of these contracts also incorporate discount rates using the yield curve approach.  

The fair value of derivative contracts classified as Level 3 utilizes significant unobservable inputs.  The fair value is modeled using income techniques, such as discounted cash flow approaches adjusted for assumptions relating to exit price.  Significant observable inputs for valuations of these contracts include energy and energy-related product prices in future years for which quoted prices in an active market exist.  Fair value measurements categorized in Level 3 of the fair value hierarchy are prepared by individuals with expertise in valuation techniques, pricing of energy and energy-related products, and accounting requirements.  The future power and capacity prices for periods that are not quoted in an active market or established at auction are based on available market data and are escalated based on estimates of inflation to address the full time period of the contract.  

Valuations of derivative contracts using discounted cash flow methodology include assumptions regarding the timing and likelihood of scheduled payments and also reflect non-performance risk, including credit, using the default probability approach based on the counterparty's credit rating for assets and the company's credit rating for liabilities.  Valuations incorporate estimates of premiums or discounts that would be required by a market participant to arrive at an exit price, using historical market transactions adjusted for the terms of the contract.

28

The following is a summary of NU’s, including CL&P’s, NSTAR Electric’s and WMECO’s, Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:

	As of March 31, 2013		As of December 31, 2012
	Range	Period Covered	Range	Period Covered
Energy Prices:
NU	$44 - $90 per MWh	2018 – 2028	$43 - $90 per MWh	2018 - 2028
CL&P	$50 - $54 per MWh	2018 – 2020	$50 - $55 per MWh	2018 - 2020
WMECO	$44 - $90 per MWh	2018 – 2028	$43 - $90 per MWh	2018 - 2028
Capacity Prices:
NU	$1.40 - $10.53 per kW-Month	2016 – 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
CL&P	$1.40 - $9.83 per kW-Month	2016 – 2026	$1.40 - $9.83 per kW-Month	2016 - 2026
NSTAR Electric	$1.40 - $3.39 per kW-Month	2016 – 2019	$1.40 - $3.39 per kW-Month	2016 - 2019
WMECO	$1.40 - $10.53 per kW-Month	2016 – 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
Forward Reserve:
NU, CL&P	$3.00 per kW-Month	2013 – 2024	$0.35 - $0.90 per kW-Month	2013 - 2024
REC Prices:
NU	$25 - $85 per REC	2013 – 2028	$25 - $85 per REC	2013 - 2028
NSTAR Electric	$25 - $71 per REC	2013 – 2018	$25 - $71 per REC	2013 - 2018
WMECO	$25 - $85 per REC	2013 – 2028	$25 - $85 per REC	2013 - 2028

Exit price premiums of 11 percent through 32 percent are also applied on these contracts and reflect the most recent market activity available for similar type contracts.

Significant increases or decreases in future power or capacity prices in isolation would decrease or increase, respectively, the fair value of the derivative liability.  Any increases in the risk premiums would increase the fair value of the derivative liabilities.  Changes in these fair values are recorded as a regulatory asset or liability and would not impact net income.  

Valuations using significant unobservable inputs:  The following tables present changes for the three months ended March 31, 2013 and 2012 in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis.  The derivative assets and liabilities are presented on a net basis.  The fair value as of January 1, 2012 reflects a reclassification of remaining unregulated wholesale marketing sourcing contracts that had previously been presented as a portfolio along with the unregulated wholesale marketing sales contract as Level 3 under the highest and best use valuation premise.  These contracts are now classified within Level 2 of the fair value hierarchy.

		For the Three Months Ended
		March 31, 2013		March 31, 2012
(Millions of Dollars)		NU		NU
Derivatives, Net:
Fair Value as of Beginning of Period		$	(878.6)	$	(962.2)
Transfer to Level 2			-		32.2
Net Realized/Unrealized Gains Included in:
	Net Income (2)		5.7		8.0
	Regulatory Assets		26.2		6.0
Settlements			13.6		14.5
Fair Value as of End of Period		$	(833.1)	$	(901.5)

		For the Three Months Ended
		March 31, 2013						March 31, 2012
(Millions of Dollars)		CL&P		NSTAR Electric		WMECO		CL&P		NSTAR Electric(1)		WMECO
Derivatives, Net:
Fair Value as of Beginning of Period		$	(866.2)	$	(14.9)	$	(3.0)	$	(931.6)	$	(3.4)	$	(7.3)
Net Realized/Unrealized Gains/(Losses)
	Included in Regulatory Assets		24.3		0.7		1.2		10.9		(3.4)		(5.0)
Settlements			22.3		0.6		-		21.1		1.4		-
Fair Value as of End of Period		$	(819.6)	$	(13.6)	$	(1.8)	$	(899.6)	$	(5.4)	$	(12.3)

⁽¹⁾

NSTAR Electric amounts are not included in NU consolidated for the three months ended March 31, 2012.

⁽²⁾

The Net Income impact for the three months ended March 31, 2013 and 2012 relates to the unregulated wholesale marketing sales contract and is offset by the gains/(losses) on the unregulated sourcing contracts classified as Level 2 in the fair value hierarchy, resulting in total net gains of $0.3 million and net losses of $0.8 million, respectively.

5.

MARKETABLE SECURITIES (NU, WMECO)

NU maintains a supplemental benefit trust to fund certain of NU’s non-qualified executive retirement benefit obligations and WMECO maintains a spent nuclear fuel trust to fund WMECO’s prior period spent nuclear fuel liability, each of which hold marketable securities.  

29

These trusts are not subject to regulatory oversight by state or federal agencies.  NU's marketable securities also include legally restricted trusts for the decommissioning of nuclear power plants that are part of CYAPC and YAEC.

The Company elects to record mutual funds purchased by the NU supplemental benefit trust at fair value.  As such, any change in fair value of these mutual funds is reflected in Net Income.  These mutual funds, classified as Level 1 in the fair value hierarchy, totaled $51.2 million and $47 million as of March 31, 2013 and December 31, 2012, respectively, and are included in current Marketable Securities.  Net gains on these securities of $4.2 million and $3.2 million for the three months ended March 31, 2013 and 2012, respectively, were recorded in Other Income, Net on the consolidated statements of income.  Dividend income is recorded when dividends are declared and is recorded in Other Income, Net on the consolidated statements of income.  All other marketable securities are accounted for as available-for-sale.  

Available-for-Sale Securities:  The following is a summary of NU's available-for-sale securities held in the NU supplemental benefit trust, WMECO's spent nuclear fuel trust and CYAPC and YAEC's nuclear decommissioning trusts.  These securities are recorded at fair value and included in current and long-term Marketable Securities on the consolidated balance sheets.

		As of March 31, 2013
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	355.3	$	10.0	$	(0.1)	$	365.2
	Equity Securities (2)		144.0		30.7		-		174.7
WMECO
	Debt Securities		57.7		0.1		-		57.8
		As of December 31, 2012
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	266.6	$	13.3	$	(0.1)	$	279.8
	Equity Securities (2)		145.5		20.0		-		165.5
WMECO
	Debt Securities		57.7		0.1		(0.1)		57.7

⁽¹⁾

Unrealized gains and losses on debt securities for the NU supplemental benefit trust and WMECO spent nuclear fuel trust are recorded in AOCI and Other Long-Term Assets, respectively, on the consolidated balance sheets.  

⁽²⁾

NU's amounts include CYAPC's and YAEC's marketable securities held in nuclear decommissioning trusts of $434.9 million and $340.4 million as of March 31, 2013 and December 31, 2012, respectively, the majority of which are legally restricted and can only be used for the decommissioning of the nuclear power plants owned by these companies. In 2013, CYAPC and YAEC received cash from the DOE that was invested in the nuclear decommissioning trusts. For further information see Note 9B "Commitments and Contingencies - Deferred Contractual Obligations" to the consolidated financial statements.  Unrealized gains and losses for the nuclear decommissioning trusts are offset in Other Long-Term Liabilities on the consolidated balance sheets.  All of the equity securities accounted for as available-for-sale securities are held in these trusts.

Unrealized Losses and Other-than-Temporary Impairment:  There have been no significant unrealized losses, other-than-temporary impairments or credit losses for the NU supplemental benefit trust, the WMECO spent nuclear fuel trust, and in the trusts held by CYAPC and YAEC. Factors considered in determining whether a credit loss exists include the duration and severity of the impairment, adverse conditions specifically affecting the issuer, and the payment history, ratings and rating changes of the security.  For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated.

Realized Gains and Losses:  Realized gains and losses on available-for-sale securities are recorded in Other Income, Net for the NU supplemental benefit trust, Other Long-Term Assets for the WMECO spent nuclear fuel trust, and offset in Other Long-Term Liabilities for CYAPC and YAEC.  NU utilizes the specific identification basis method for the NU supplemental benefit trust securities and the average cost basis method for the WMECO spent nuclear fuel trust and the CYAPC and YAEC nuclear decommissioning trusts to compute the realized gains and losses on the sale of available-for-sale securities.   

Contractual Maturities:  As of March 31, 2013, the contractual maturities of available-for-sale debt securities are as follows:

	NU				WMECO
	Amortized				Amortized
(Millions of Dollars)	Cost		Fair Value		Cost		Fair Value
Less than one year (1)	$	150.7	$	150.8	$	30.4	$	30.6
One to five years		62.2		63.5		18.7		18.5
Six to ten years		51.2		53.4		4.1		4.1
Greater than ten years		91.2		97.5		4.5		4.6
Total Debt Securities	$	355.3	$	365.2	$	57.7	$	57.8

⁽¹⁾

Amounts in the Less than one year NU category include securities in the nuclear decommissioning trusts, which are restricted and are classified in long-term Marketable Securities on the consolidated balance sheets.

Fair Value Measurements:  The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:

			NU				WMECO
			As of				As of
(Millions of Dollars)			March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Level 1:
	Mutual Funds and Equities		$	225.9	$	212.5	$	-	$	-
	Money Market Funds			120.1		40.2		3.6		5.2
Total Level 1			$	346.0	$	252.7	$	3.6	$	5.2
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)	$	78.5	$	69.9	$	18.2	$	18.7
	Corporate Debt Securities			41.1		33.0		11.7		7.0
	Asset-Backed Debt Securities			26.4		28.5		9.6		10.9
	Municipal Bonds			82.6		93.8		8.6		11.6
	Other Fixed Income Securities			16.5		14.4		6.1		4.3
Total Level 2			$	245.1	$	239.6	$	54.2	$	52.5
Total Marketable Securities			$	591.1	$	492.3	$	57.8	$	57.7

U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates.  Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instrument and also incorporating yield curves, credit spreads and specific bond terms and conditions.  Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables.  Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates and tranche information.  Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields.  Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

6.

SHORT-TERM AND LONG-TERM DEBT

Limits:  The amount of short-term borrowings that may be incurred by CL&P, NSTAR Electric and WMECO is subject to periodic approval by the FERC.  On November 30, 2011, the FERC granted authorization to allow CL&P and WMECO to incur total short-term borrowings up to a maximum of $450 million and $300 million, respectively, effective January 1, 2012 through December 31, 2013.  On March 22, 2012, the FERC approved CL&P's application requesting to increase its total short-term borrowing capacity from a maximum of $450 million to a maximum of $600 million for the authorization period through December 31, 2013.  On May 16, 2012, the FERC granted authorization to allow NSTAR Electric to issue total short-term debt securities in an aggregate principal amount not to exceed $655 million outstanding at any one time, effective October 23, 2012 through October 23, 2014.  As a result of the NHPUC having jurisdiction over PSNH's short-term debt, PSNH is not currently required to obtain FERC approval for its short-term borrowings.

Credit Agreements and Commercial Paper Programs:  As of March 31, 2013 and December 31, 2012, NU had $979 million and $1.15 billion, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $171 million of available borrowing capacity as of March 31, 2013.  The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.35 percent and 0.46 percent, respectively, which is generally based on money market rates.  As of March 31, 2013, there were inter-company loans of $832 million from NU to its subsidiaries ($210.4 million at CL&P, $53.4 million at PSNH and $43.4 million at WMECO).  As of December 31, 2012, there were inter-company loans of $987.5 million from NU to its subsidiaries ($405.1 million at CL&P, $63.3 million at PSNH, and $31.9 million at WMECO).  As of March 31, 2013 and December 31, 2012, NSTAR Electric had $308 million and $276 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $142 million and $174 million, respectively, of available borrowing capacity.  The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.28 percent and 0.31 percent, respectively, which is generally based on money market rates.

Amounts outstanding under the commercial paper program are included in Notes Payable for NU and NSTAR Electric and classified in current liabilities on the consolidated balance sheets as management anticipates that all borrowings under these credit facilities will be outstanding for no more than 364 days at one time.  Intercompany loans from NU to CL&P, PSNH and WMECO are included in Notes Payable to Affiliated Companies and classified in current liabilities on the consolidated balance sheets.  

Long-Term Debt Issuances:  On January 15, 2013, CL&P issued $400 million of Series A First and Refunding Mortgage Bonds with a coupon rate of 2.5 percent and a maturity date of January 15, 2023.  The proceeds, net of issuance costs, were used to pay short-term borrowings outstanding under the CL&P credit agreement and the NU commercial paper program.  Therefore, as of December 31, 2012, CL&P's credit agreement borrowings of $89 million and intercompany loans related to the commercial paper program of $305.8 million have been classified as Long-Term Debt on the consolidated balance sheet.

31

On May 1, 2013, PSNH redeemed at par approximately $109 million of the 2001 Series C PCRBs that were due to mature in 2021 with short-term debt.  As a result, the PCRBs were recorded as Long-Term Debt - Current Portion.

Working Capital:  NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and fund other corporate obligations, such as pension contributions.  The current growth in NU’s transmission construction expenditures utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period.  In addition, NU’s Regulated companies operate in an environment where recovery of its electric and natural gas distribution construction expenditures takes place over an extended period of time.  This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs.  These factors have resulted in NU’s current liabilities exceeding current assets by approximately $1.7 billion, $231 million, $226 million, $34 million and $48 million at NU, CL&P, NSTAR Electric, PSNH and WMECO, respectively, as of March 31, 2013.

As of March 31, 2013, $947.3 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months, consisting of $550 million for NU parent, $125 million for CL&P, $109 million for PSNH, $75 million for Yankee Gas and $55 million for WMECO.  Approximately $32 million relates to the amortization of the purchase accounting fair value adjustment that will be amortized in the next twelve months.  NU, with its strong credit ratings, has several options available in the financial markets to repay or refinance these maturities with the issuance of new long-term debt.  NU, CL&P, NSTAR Electric, PSNH and WMECO will reduce their short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given capital requirements and maintenance of NU's credit rating and profile.  Management expects the future operating cash flows of NU, CL&P, NSTAR Electric, PSNH and WMECO along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.

7.

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

NUSCO sponsors a defined benefit retirement plan that covers most employees, including CL&P, PSNH, and WMECO employees, hired before 2006 (or as negotiated, for bargaining unit employees), referred to as the NUSCO Pension Plan. NSTAR Electric serves as plan sponsor for a defined benefit retirement plan that covers most employees of NSTAR Electric & Gas, hired before October 1, 2012, or as negotiated by bargaining unit employees, referred to as the NSTAR Pension Plan.  Both plans are subject to the provisions of ERISA, as amended by the PPA of 2006.  NUSCO and NSTAR Electric & Gas each maintain SERPs and other non-qualified defined benefit retirement plans (herein collectively referred to as the SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible current and retired participants that would have otherwise been provided under the Pension Plans.  

NUSCO and NSTAR Electric & Gas also sponsor postretirement benefit plans that provide retiree medical, dental and life insurance benefits to employees that meet certain age and service eligibility requirements (NUSCO PBOP Plans and NSTAR PBOP Plan, respectively).  Under certain circumstances, eligible retirees are required to contribute to the costs of postretirement benefits.  The benefits provided under the NUSCO and NSTAR PBOP Plans are not vested and the Company has the right to modify any benefit provision.

The funded status of each of the plans is recorded on the respective sponsor's balance sheet:  NUSCO (NUSCO Pension, NUSCO PBOP and NUSCO SERP), NSTAR Electric (NSTAR Pension) and NSTAR Electric & Gas (NSTAR SERP and NSTAR PBOP).  The NUSCO plans are accounted for under the multiple-employer approach and the NSTAR plans are accounted for under the multi-employer approach.  Accordingly, the balance sheet of NSTAR Electric reflects the full funded status of the NSTAR Pension Plan.

The components of net periodic benefit expense for the Pension Plans (including the SERP Plans) and PBOP Plans, the portion of pension amounts capitalized related to employees working on capital projects, and intercompany allocations not included in the net periodic benefit expense are as follows:

	Pension and SERP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	26.6	$	15.3
Interest Cost		51.4		38.1
Expected Return on Plan Assets		(70.3)		(42.5)
Actuarial Loss		52.9		30.1
Prior Service Cost		1.1		2.1
Total Net Periodic Benefit Expense	$	61.7	$	43.1
Capitalized Pension Expense	$	16.7	$	10.6

32

	PBOP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	4.8	$	2.3
Interest Cost		12.8		6.2
Expected Return on Plan Assets		(13.8)		(5.6)
Actuarial Loss		8.2		5.5
Prior Service Credit		(0.6)		(0.1)
Net Transition Obligation Cost		-		2.9
Total Net Periodic Benefit Expense	$	11.4	$	11.2

		Pension and SERP
		For the Three Months Ended March 31, 2013								For the Three Months Ended March 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric(1)		PSNH		WMECO
Service Cost		$	6.1	$	9.3	$	3.3	$	1.2	$	5.4	$	7.8	$	2.9	$	1.1
Interest Cost			12.1		14.2		6.0		2.5		12.8		14.8		6.1		2.6
Expected Return on Plan Assets			(18.5)		(22.0)		(7.7)		(4.3)		(17.5)		(16.5)		(6.7)		(4.1)
Actuarial Loss			14.1		14.5		5.5		3.0		11.9		15.7		3.9		2.5
Prior Service Cost/(Credit)			0.5		-		0.1		0.1		0.9		(0.2)		0.4		0.2
Total Net Periodic Benefit Expense		$	14.3	$	16.0	$	7.2	$	2.5	$	13.5	$	21.6	$	6.6	$	2.3
Related Intercompany
	Allocations	$	10.7	$	(2.0)	$	2.6	$	1.8	$	10.6	$	(3.1)	$	2.5	$	2.0
Capitalized Pension Expense		$	7.0	$	5.3	$	2.2	$	1.3	$	6.6	$	6.3	$	2.0	$	1.2

		PBOP
		For the Three Months Ended March 31, 2013						For the Three Months Ended March 31, 2012
(Millions of Dollars)		CL&P			PSNH		WMECO	CL&P		PSNH		WMECO
Service Cost		$	0.9	$	0.6	$	0.2	$	0.8	$	0.5	$	0.2
Interest Cost			2.0		1.0		0.4		2.4		1.2		0.5
Expected Return on Plan Assets			(2.5)		(1.3)		(0.6)		(2.3)		(1.1)		(0.5)
Actuarial Loss			1.7		0.9		0.3		2.0		1.0		0.3
Net Transition Obligation Cost			-		-		-		1.5		0.6		0.3
Total Net Periodic Benefit Expense		$	2.1	$	1.2	$	0.3	$	4.4	$	2.2	$	0.8
Related Intercompany
	Allocations	$	1.6	$	0.4	$	0.3	$	2.1	$	0.5	$	0.4

⁽¹⁾

NSTAR Electric amounts are not included in NU consolidated for the three months ended March 31, 2012.

For the NSTAR PBOP Plan, NSTAR allocates the net periodic postretirement expenses to its subsidiaries based on actual labor charges to each of its subsidiaries.  The net periodic postretirement expense allocated to NSTAR Electric was $4.3 million and $9 million for the three months ended March 31, 2013 and 2012, respectively.  The three months ended March 31, 2012 amount was not included in NU consolidated.

Contributions: NU’s policy is to annually fund the NUSCO and NSTAR Pension Plans in an amount at least equal to an amount that will satisfy federal requirements.  Based on the current status of the NUSCO Pension Plan, NU anticipates making a contribution of approximately $203 million in 2013, of which $107 million is required to meet minimum federal funding requirements.  NSTAR Electric anticipates making a contribution of approximately $82 million in 2013 to the NSTAR Pension Plan, of which $38 million is required to meet minimum federal funding requirements.  Contributions are being made in installments and began in January 2013.  For the three months ended March 31, 2013, NU contributed $35.1 million to the NUSCO Pension Plan, all of which was contributed by PSNH, and NSTAR Electric contributed $4.3 million to the NSTAR Pension Plan.

For the PBOP Plans, it is NU’s policy to annually fund the NUSCO PBOP Plans in an amount equal to the PBOP Plans' postretirement benefit cost, excluding curtailment and termination benefits, if applicable.  NU anticipates making $25.7 million in contributions in 2013.  NU contributes an amount that approximates annual benefit payments to the NSTAR PBOP Plan.  NU anticipates making $30 million in contributions in 2013, of which $7.5 million was contributed during the three months ended March 31, 2013.  

8.

INCOME TAXES

Tax Positions: InMarch 2013, NU received a Final Determination from the Connecticut Department of Revenue Services (DRS) Appellate Division that concluded its audit of NU's Connecticut income tax returns for the years 2005 through 2008, bringing closure to, and effective settlement of, issues concerning the deductibility of expenses and credits through 2008.  The DRS Determination resulted in total NU and CL&P after-tax benefits of $13.6 million and $6.9 million, respectively, recorded in the first quarter of 2013 that included a reduction in NU and CL&P pre-tax interest expense of $8.7 million and $4 million, or $5.2 million and $2.4 million after-tax, respectively.  Further, the income tax expense impact resulted in a tax benefit to NU and CL&P of $8.4 million and $4.5 million after-tax, respectively.  Management estimates that resolution of this audit decreases NU's and CL&P's unrecognized tax benefits by approximately $49.8 million and $39.4 million, respectively, that was largely offset by NU's and CL&P's valuation allowance and other tax impacts of $44.9 million and $36.5 million, respectively.  

33

NU currently has open tax years.  It is reasonably possible that at least one of these open tax years could be resolved within the next twelve months.  Management estimates that the potential resolutions could result in a $1 million to $2 million decrease, net of any related valuation allowance, in unrecognized tax benefits for NU.  

9.

COMMITMENTS AND CONTINGENCIES

A.

Environmental Matters

General:  NU, CL&P, NSTAR Electric, PSNH and WMECO are subject to environmental laws and regulations intended to mitigate or remove the effect of past operations and improve or maintain the quality of the environment.  These laws and regulations require the removal or the remedy of the effect on the environment of the disposal or release of certain specified hazardous substances at current and former operating sites.  NU, CL&P, NSTAR Electric, PSNH and WMECO have an active environmental auditing and training program and believe that they are substantially in compliance with all enacted laws and regulations.

The number of environmental sites and reserves related to these sites for which remediation or long-term monitoring, preliminary site work or site assessment are being performed are as follows:

	As of March 31, 2013				As of December 31, 2012
			Reserve				Reserve
	Number of Sites		(in millions)		Number of Sites		(in millions)
NU		72	$	40.7		77	$	39.4
CL&P		19		3.6		19		3.7
NSTAR Electric		14		1.5		16		1.7
PSNH		16		5.6		16		4.9
WMECO		5		0.5		6		0.6

Included in the NU number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured gas from coal and other processes, which resulted in certain by-products remaining in the environment that may pose a potential risk to human health and the environment. The reserve balance related to these former MGP sites was $34.3 million and $34.5 million as of March 31, 2013 and December 31, 2012, respectively, and relates primarily to the natural gas business segment.

HWP:  HWP, a subsidiary of NU, continues to investigate the potential need for additional remediation at a river site in Massachusetts containing tar deposits associated with an MGP site that HWP sold to HG&E, a municipal utility, dating back to 1902.  HWP shares responsibility for site remediation with HG&E and has conducted substantial investigative and remediation activities.  The cumulative expense recorded to the reserve for this site since 1994 through March 31, 2013 was $19.5 million, of which $17.5 million had been spent, leaving $2 million in the reserve as of March 31, 2013.  There were no charges recorded to the reserve for the three months ended March 31, 2013 and 2012.  HWP's share of the costs related to this site is not recoverable from customers.

The $2 million reserve balance as of March 31, 2013 represents estimated costs that HWP considers probable over the remaining life of the project, including testing and related costs in the near term and field activities to be agreed upon with the MA DEP, further studies and long-term monitoring that are expected to be required by the MA DEP, and certain soft tar remediation activities.  Various factors could affect management's estimates and require an increase to the reserve, which would be reflected as a charge to Net Income.  Although a material increase to the reserve is not presently anticipated, management cannot reasonably estimate potential additional investigation or remediation costs because these costs would depend on, among other things, the nature, extent and timing of additional investigation and remediation that may be required by the MA DEP.  

B.

Deferred Contractual Obligations

CL&P, NSTAR Electric, PSNH and WMECO have decommissioning and plant closure cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear facilities and are now engaged in the long-term storage of their spent fuel.  The Yankee Companies collect decommissioning and closure costs through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric, PSNH and WMECO.  These companies in turn recover these costs from their customers through state regulatory commission-approved retail rates.  

CL&P, NSTAR Electric, PSNH and WMECO's percentage share of the obligations to support the Yankee Companies under FERC-approved rate tariffs is the same as their respective ownership percentages in the Yankee Companies.

The Yankee Companies are currently collecting amounts that management believes are adequate to recover the remaining decommissioning and closure cost estimates for the respective plants.  Management believes CL&P, NSTAR Electric and WMECO will recover their shares of these decommissioning and closure obligations from their customers.  PSNH has already recovered its share of these costs from its customers.

Spent Nuclear Fuel Litigation:  

DOE Phase I Damages - In 1998, the Yankee Companies filed separate complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal by January 31, 1998 pursuant to the terms of the 1983 spent fuel and high level waste disposal contracts between the Yankee Companies and the DOE (DOE Phase I Damages).  Following multiple appeals filed by the DOE and cross-appeals filed by the Yankee Companies, on September 5, 2012, the judgment to award CYAPC $39.7 million, YAEC $38.2 million and MYAPC $81.7 million became final and non-appealable and interest on the judgments began to accrue on or about December 5, 2012.

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In January 2013, the proceeds from the DOE Phase I Damages Claim were received by CYAPC in the amount of $39.7 million, YAEC in the amount of $38.2 million, and MYAPC in the amount of $81.7 million.  The funds were transferred to each Yankee Company’s respective decommissioning trust.  As a result of NU's consolidation of CYAPC and YAEC, the consolidated financial statements reflect an increase of $77.9 million in marketable securities for CYAPC and YAEC’s Phase I damage awards that were invested in the nuclear decommissioning trusts as of March 31, 2013.

The final application of the proceeds for the benefit of customers of CL&P, NSTAR Electric, PSNH and WMECO will be determined following rate proceedings that were filed by each Yankee Company at FERC on May 1, 2013.  Final FERC determinations are expected by the end of the third quarter of 2013.

C.

Guarantees and Indemnifications

NU parent, or NSTAR LLC, as applicable, provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, in the form of guarantees in the normal course of business.  

NU provided guarantees and various indemnifications on behalf of external parties as a result of the sales of former subsidiaries of NU Enterprises, with maximum exposures either not specified or not material.  

NU also issued a guaranty for the benefit of Hydro Renewable Energy under which, beginning at the time the Northern Pass Transmission line goes into commercial operation, NU will guarantee the financial obligations of NPT under the TSA in an amount not to exceed $25 million.  NU's obligations under the guaranty expire upon the full, final and indefeasible payment of the guaranteed obligations.  

Management does not anticipate a material impact to Net Income as a result of these various guarantees and indemnifications.  

The following table summarizes NU's guarantees of its subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, as of March 31, 2013:  

		Maximum
		Exposure
Subsidiary	Description	(in millions)			Expiration Dates
Various	Surety Bonds	$	33.1		2013 - 2015 (1)
Various	NE Hydro Companies' Long-Term Debt	$	5.6		Unspecified
NUSCO and RRR	Lease Payments for Vehicles and Real Estate	$	19.2		2019 and 2024
NU Enterprises	Surety Bonds, Insurance Bonds and Performance Guarantees	$	67.8	(2)	(2)

⁽¹⁾

Surety bond expiration dates reflect bond termination dates, the majority of which will be renewed or extended.  

⁽²⁾

The maximum exposure includes $8.4 million related to performance guarantees on wholesale purchase contracts, which expire December 31, 2013.  Also included in the maximum exposure is $1 million related to insurance bonds with no expiration date that are billed annually on their anniversary date.  The remaining $58.4 million of maximum exposure relates to surety bonds covering ongoing projects, which expire upon project completion.

Many of the underlying contracts that NU parent guarantees, as well as certain surety bonds, contain credit ratings triggers that would require NU parent to post collateral in the event that the unsecured debt credit ratings of NU, or NSTAR LLC, as applicable, are downgraded.  

D.

FERC Base ROE Complaint

On September 30, 2011, several New England state attorneys general, state regulatory commissions, consumer advocates and other parties filed a joint complaint with the FERC under Sections 206 and 306 of the Federal Power Act alleging that the base ROE used in calculating formula rates for transmission service under the ISO-NE Open Access Transmission Tariff by New England transmission owners, including CL&P, NSTAR Electric, PSNH and WMECO, is unjust and unreasonable.  The complainants asserted that the current 11.14 percent rate, which became effective in 2006, is excessive due to changes in the capital markets and are seeking an order to reduce the rate, which would be effective October 1, 2011.  In response, the New England transmission owners filed testimony and analysis based on standard FERC methodology and precedent, demonstrating that the base ROE of 11.14 percent remained just and reasonable.  The FERC set the case for trial before a FERC administrative law judge after settlement negotiations were unsuccessful in August 2012.

As part of the pre-trial process, on April 17, 2013, the complainants, the Massachusetts municipal electric utilities (late intervenors to the case), and the FERC trial staff updated their respective ROE analyses, which demonstrated a base ROE of approximately 8.9 percent.  The New England transmission owners also filed an updated analysis, including a supplement on April 26, 2013, that continues to demonstrate that the current ROE of 11.14 percent remains within an updated range of reasonableness of 7.3 percent to 13.2 percent.  Hearings on this complaint are scheduled to commence on May 6, 2013 and the trial judge’s recommended decision is due in September 2013.  A decision from FERC commissioners is expected in 2014.  Refunds to customers, if any, as a result of a reduction in the NU transmission companies’ base ROE would be for the period October 1, 2011 through December 31, 2012.

35

On December 27, 2012, several additional parties filed a separate complaint concerning the New England transmission owners' base ROE with the FERC.  This new complaint seeks to reduce the New England transmission owners’ base ROE effective January 1, 2013, effectively extending the refund period for an additional 15 months, and to consolidate this new complaint with the joint complaint filed on September 30, 2011.  The New England transmission owners have asked the FERC to reject this new complaint.  The FERC has not yet acted on this request.

E.

DPU Safety and Reliability Programs - CPSL (NSTAR Electric)

Since 2006, NSTAR Electric has been recovering incremental costs related to the DPU-approved Safety and Reliability Programs.  From 2006 through 2011, cumulative costs associated with the CPSL program resulted in an incremental revenue requirement to customers of approximately $83 million.  These amounts included incremental operations and maintenance costs and the related revenue requirement for specific capital investments relative to the CPSL programs.

On May 28, 2010, the DPU issued an order on NSTAR Electric’s 2006 CPSL cost recovery filing (the May 2010 Order).  In October 2010, NSTAR Electric filed a reconciliation of the cumulative CPSL program activity for the periods 2006 through 2009 with the DPU in order to determine a proposed rate adjustment.  The DPU allowed the proposed rates to go into effect January 1, 2011, subject to final reconciliation of CPSL program costs through a future DPU proceeding.  In February 2013, NSTAR Electric updated the October 2010 filing with final activity through 2011.  

NSTAR Electric cannot predict the timing of a final DPU order related to its CPSL filings for the period 2006 through 2011.  Therefore, NSTAR Electric recorded its 2006 through 2011 revenues under the CPSL programs based on the May 2010 Order.  While management does not believe that any subsequent DPU order would result in revenues that are materially different than the amounts already recognized, it is reasonably possible that an order could have a material impact on NSTAR Electric’s results of operations, financial position and cash flows.

F.

Basic Service Bad Debt Adder (NSTAR Electric)

In accordance with a generic DPU order, electric utilities in Massachusetts recover the energy-related portion of bad debt costs in their Basic Service rates.  In 2007, NSTAR Electric filed its 2006 Basic Service reconciliation with the DPU proposing an adjustment related to the increase of its Basic Service bad debt charge-offs.  The DPU issued an order approving the implementation of a revised Basic Service rate but instructed NSTAR Electric to reduce distribution rates by an amount equal to the increase in its Basic Service bad debt charge-offs.  This adjustment to NSTAR Electric’s distribution rates would eliminate the fully reconciling nature of the Basic Service bad debt adder.

In 2010, NSTAR Electric filed an appeal of the DPU’s order with the SJC.  In 2012, the SJC vacated the DPU order and remanded the matter to the DPU for further review.  

NSTAR Electric deferred approximately $34 million of costs associated with energy-related bad debt as a regulatory asset through 2011 as NSTAR Electric had concluded that it was probable that these costs would ultimately be recovered from customers.  Due to the delays and duration of the proceedings, NSTAR Electric concluded that while an ultimate outcome on the matter in its favor remained "more likely than not," it could no longer be deemed "probable."  As a result, NSTAR Electric recognized a reserve related to the regulatory asset in the first quarter of 2011.  NSTAR Electric will continue to maintain the reserve until the ultimate outcome is determined by the DPU.

10.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The following methods and assumptions were used to estimate the fair value of each of the following financial instruments:

Preferred Stock, Long-Term Debt and Rate Reduction Bonds:  The fair value of CL&P's and NSTAR Electric’s preferred stock is based upon pricing models that incorporate interest rates and other market factors, valuations or trades of similar securities and cash flow projections.  The fair value of fixed-rate long-term debt securities and RRBs is based upon pricing models that incorporate quoted market prices for those issues or similar issues adjusted for market conditions, credit ratings of the respective companies and treasury benchmark yields.  Adjustable rate securities are assumed to have a fair value equal to their carrying value.  The fair values provided in the tables below are classified as Level 2 within the fair value hierarchy.  Carrying amounts and estimated fair values are as follows:

		As of March 31, 2013				As of December 31, 2012
		NU				NU
		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	155.6	$	154.2	$	155.6	$	152.2
Long-Term Debt			7,958.9		8,634.1		7,963.5		8,640.7
Rate Reduction Bonds			19.6		19.7		82.1		83.0

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		As of March 31, 2013
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	111.6	$	43.0	$	42.6	$	-	$	-	$	-	$	-
Long-Term Debt			2,865.6		3,295.9		1,602.6		1,809.0		998.0		1,091.6		605.1		665.0
Rate Reduction Bonds			-		-		-		-		15.0		15.0		4.6		4.7
		As of December 31, 2012
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	110.0	$	43.0	$	42.2	$	-	$	-	$	-	$	-
Long-Term Debt			2,862.8		3,295.4		1,602.6		1,818.8		997.9		1,088.0		605.3		660.4
Rate Reduction Bonds			-		-		43.5		43.9		29.3		29.6		9.4		9.5

Derivative Instruments:  NU, including CL&P, NSTAR Electric and WMECO, holds various derivative instruments that are carried at fair value.  For further information, see Note 4, "Derivative Instruments," to the consolidated financial statements.  

Other Financial Instruments:  Investments in marketable securities are carried at fair value on the accompanying consolidated balance sheets.  For further information, see Note 1E, "Summary of Significant Accounting Policies - Fair Value Measurements," and Note 5, "Marketable Securities," to the consolidated financial statements.

The carrying value of other financial instruments included in current assets and current liabilities, including cash and cash equivalents and special deposits, approximates their fair value due to the short-term nature of these instruments.

11.

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

The changes in accumulated other comprehensive income/(loss) by component, net of tax, is as follows:

	For the Three Months Ended March 31, 2013
(Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Available-for-Sale Securities		Pension, SERP and PBOP   Benefit Plans		Total
AOCI as of January 1, 2013	$	(16.4)	$	1.3	$	(57.8)	$	(72.9)
Other Comprehensive Income Before Reclassifications		-		(0.1)		-		(0.1)
Amounts Reclassified from AOCI		0.5		-		1.6		2.1
Net Other Comprehensive Income		0.5		(0.1)		1.6		2.0
AOCI as of March 31, 2013	$	(15.9)	$	1.2	$	(56.2)	$	(70.9)

NU's qualified cash flow hedging instruments represent interest rate swap agreements on debt issuances that were settled in prior years.  The settlement amount was recorded in AOCI and is being amortized into Net Income over the term of the underlying debt instrument.  CL&P, PSNH and WMECO continue to amortize interest rate swaps settled in prior years from AOCI into Interest Expense over the remaining life of the associated long-term debt, which are not material to their respective consolidated financial statements.

The following table sets forth the amounts reclassified from AOCI by component and the affected line item on the statement of income:

	For the Three Months Ended March 31, 2013
	Amount
	Reclassified		Statement of Income
(Millions of Dollars)	from AOCI		Line Item Impacted
Qualified Cash Flow Hedging Instruments	$	(0.8)	Interest Expense
Tax Benefit		0.3	Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	$	(0.5)
Pension, SERP and PBOP Benefit Plan Costs:
Amortization of Actuarial Losses	$	(2.6)	(1)
Amortization of Prior Service Cost		-	(1)
Total Pension, SERP and PBOP Benefit Plan Costs		(2.6)	(1)
Tax Benefit		1.0	Income Tax Expense
Pension, SERP and PBOP Benefit Plan Costs, Net of Tax	$	(1.6)
Total Amount Reclassified from AOCI, Net of Tax	$	(2.1)

⁽¹⁾

These AOCI amounts are included in the computation of net periodic Pension, SERP and PBOP costs.  See Note 7, “Pension Benefits and Postretirement Benefits Other Than Pensions,” for further information.

37

12.

COMMON SHARES

The following table sets forth the NU common shares and the shares of CL&P, NSTAR Electric, PSNH and WMECO common stock authorized and issued as of March 31, 2013 and December 31, 2012 and the respective par values:  

	Shares
	Authorized				Issued
	Per Share		As of		As of
	Par Value		March 31, 2013	December 31, 2012	March 31, 2013		December 31, 2012
NU	$	5	380,000,000	380,000,000		332,951,956		332,509,383
CL&P	$	10	24,500,000	24,500,000		6,035,205		6,035,205
NSTAR Electric	$	1	100,000,000	100,000,000		100		100
PSNH	$	1	100,000,000	100,000,000		301		301
WMECO	$	25	1,072,471	1,072,471		434,653		434,653

As of March 31, 2013 and December 31, 2012, 18,356,487 and 18,455,749 NU common shares were held as treasury shares, respectively.

13.		COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows:
			For the Three Months Ended
			March 31, 2013				March 31, 2012
					Noncontrolling								Noncontrolling
					Interest -								Interest -
			Common		Preferred		Common		Non-				Preferred
			Shareholders'		Stock of		Shareholders'		Controlling		Total		Stock of
(Millions of Dollars)			Equity		Subsidiaries		Equity		Interest		Equity		Subsidiaries
Balance - Beginning of Period			$	9,237.1	$	155.6	$	4,012.7	$	3.0	$	4,015.7	$	116.2
Net Income				230.0		-		100.8		-		100.8		-
Dividends on Common Shares				(116.4)		-		(52.6)		-		(52.6)		-
Dividends on Preferred Stock				(1.9)		(1.9)		(1.4)		-		(1.4)		(1.4)
Issuance of Common Shares				8.4		-		6.2		-		6.2		-
Contributions to NPT				-		-		-		0.3		0.3		-
Other Transactions, Net				(14.0)		-		0.8		-		0.8		-
Net Income Attributable to
	Noncontrolling Interests			-		1.9		(0.1)		0.1		-		1.4
Other Comprehensive Income				2.0		-		1.9		-		1.9		-
Balance - End of Period			$	9,345.2	$	155.6	$	4,068.3	$	3.4	$	4,071.7	$	116.2

14.

EARNINGS PER SHARE (NU)

Basic EPS is computed based upon the weighted average number of common shares outstanding during each period.  Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect if certain share-based compensation awards are converted into common shares.  For the three months ended March 31, 2013, there were 6,299 share awards excluded from the computation as these awards were antidilutive.  There were no antidilutive share awards for the three months ended March 31, 2012.  

The following table sets forth the components of basic and diluted EPS:

		For the Three Months Ended March 31,
(Millions of Dollars, except share information)		2013		2012
Net Income Attributable to Controlling Interest		$	228.1	$	99.3
Weighted Average Common Shares Outstanding:
	Basic		315,129,782		178,055,716
	Dilutive Effect		872,756		381,737
	Diluted		316,002,538		178,437,453
Basic and Diluted EPS		$	0.72	$	0.56

On April 10, 2012, NU issued approximately 136 million common shares as a result of the merger with NSTAR, which are reflected in weighted average common shares outstanding as of March 31, 2013.

RSUs and performance shares are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied.  The dilutive effect of unvested RSUs and performance shares is calculated using the treasury stock method.  Assumed proceeds of these units under the treasury stock method consist of the remaining compensation cost to be recognized and a theoretical tax benefit.  The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the units (the difference between the market value of the average units outstanding for the period, using the average market price during the period, and the grant date market value).  

38

The dilutive effect of stock options to purchase common shares is also calculated using the treasury stock method.  Assumed proceeds for stock options consist of cash proceeds that would be received upon exercise, and a theoretical tax benefit.  The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the stock options (the difference between the market value of the average stock options outstanding for the period, using the average market price during the period, and the exercise price).  

15.

SEGMENT INFORMATION (NU)

Presentation:  NU is organized between the Electric Distribution, Electric Transmission and Natural Gas Distribution segments and Other based on a combination of factors, including the characteristics of each segments' products and services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates.  These segments represented substantially all of NU's total consolidated revenues for the three month periods ended March 31, 2013 and 2012.  Revenues from the sale of electricity and natural gas primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.  The Electric Distribution segment includes the generation activities of PSNH and WMECO.  

Other operations in the tables below primarily consists of 1) the equity in earnings of NU parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest income and expense related to the cash and debt of NU parent and NSTAR LLC, respectively, 2) the revenues and expenses of NU's service companies, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, and 4) the results of other subsidiaries, which are comprised of NU Enterprises, NSTAR Communications, Inc., RRR (a real estate subsidiary), the non-energy-related subsidiaries of Yankee and the remaining operations of HWP.

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension expense.  

As discussed in Note 1A, “Summary of Significant Accounting Policies – Basis of Presentation,” certain reclassifications of prior period data were made in the consolidated statements of income for NU.  Accordingly, the corresponding items of segment information have been recast for prior periods for comparative purposes.

NU’s reportable segments are the combined Electric Distribution, Electric Transmission and Natural Gas Distribution segments, based upon the level at which NU’s chief operating decision maker assesses performance and makes decisions about the allocation of company resources.  Each of NU’s subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, has one reportable segment.  Therefore, separate Transmission and Distribution information is not disclosed for CL&P, NSTAR Electric, PSNH or WMECO. NU’s operating segments and reporting units are consistent with its reportable business segments.

NSTAR amounts are not included in NU consolidated as of March 31, 2012, but are included as of March 31, 2013.

NU's segment information for the three month periods ended March 31, 2013 and 2012 is as follows:

		For the Three Months Ended March 31, 2013
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	1,374.2	$	361.8	$	239.5	$	217.2	$	(197.7)	$	1,995.0
Depreciation and Amortization			(177.0)		(17.4)		(31.8)		(19.0)		1.7		(243.5)
Other Operating Expenses			(1,004.9)		(267.2)		(62.2)		(197.4)		199.2		(1,332.5)
Operating Income			192.3		77.2		145.5		0.8		3.2		419.0
Interest Expense			(42.1)		(7.4)		(21.9)		(6.4)		1.5		(76.3)
Interest Income			1.0		-		0.1		1.6		(1.6)		1.1
Other Income, Net			3.8		0.2		2.7		320.3		(320.3)		6.7
Income Tax (Expense)/Benefit			(54.3)		(26.7)		(45.8)		6.5		(0.2)		(120.5)
Net Income			100.7		43.3		80.6		322.8		(317.4)		230.0
Net Income Attributable
	to Noncontrolling Interests		(1.2)		-		(0.7)		-		-		(1.9)
Net Income Attributable
	to Controlling Interest	$	99.5	$	43.3	$	79.9	$	322.8	$	(317.4)	$	228.1
Total Assets (as of)		$	18,208.2	$	2,735.4	$	6,269.1	$	18,749.8	$	(17,633.8)	$	28,328.7
Cash Flows Used for
	Investments in Plant	$	157.8	$	31.2	$	185.4	$	14.6	$	-	$	389.0

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		For the Three Months Ended March 31, 2012
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	786.0	$	139.0	$	162.8	$	133.3	$	(121.5)	$	1,099.6
Depreciation and Amortization			(72.2)		(7.7)		(21.1)		(3.9)		0.3		(104.6)
Other Operating Expenses			(622.1)		(102.2)		(47.6)		(134.9)		126.2		(780.6)
Operating Income/(Loss)			91.7		29.1		94.1		(5.5)		5.0		214.4
Interest Expense			(33.0)		(5.4)		(19.7)		(9.4)		1.1		(66.4)
Interest Income			1.1		-		0.1		1.3		(1.3)		1.2
Other Income, Net			4.4		-		3.3		122.6		(122.7)		7.6
Income Tax (Expense)/Benefit			(21.4)		(9.0)		(30.8)		6.0		(0.8)		(56.0)
Net Income			42.8		14.7		47.0		115.0		(118.7)		100.8
Net Income Attributable
	to Noncontrolling Interests		(0.8)		-		(0.7)		-		-		(1.5)
Net Income Attributable
	to Controlling Interest	$	42.0	$	14.7	$	46.3	$	115.0	$	(118.7)	$	99.3
Total Assets (as of)		$	9,553.3	$	1,498.2	$	3,900.7	$	7,261.7	$	(6,235.5)	$	15,978.4
Cash Flows Used for
	Investments in Plant	$	130.7	$	20.5	$	135.9	$	17.2	$	-	$	304.3

40

NORTHEAST UTILITIES AND SUBSIDIAIRIES

Management's Discussion and Analysis of
Financial Condition and Results of Operations

The following discussion and analysis should be read in conjunction with our unaudited condensed consolidated financial statements and related combined notes included in this combined Quarterly Report on Form 10-Q and the 2012 Form 10-K.  References in this Form 10-Q to "NU," the "Company," "we," "us" and "our" refer to Northeast Utilities and its consolidated subsidiaries, including NSTAR LLC and its subsidiaries for the periods after April 10, 2012.  All per share amounts are reported on a diluted basis.  The unaudited condensed consolidated financial statements of NU, CL&P, NSTAR Electric, PSNH and WMECO are herein referred to as “consolidated financial statements”.  

Refer to the Glossary of Terms included in this combined Quarterly Report on Form 10-Q for abbreviations and acronyms used throughout this Management's Discussion and Analysis of Financial Condition and Results of Operations.  

The only common equity securities that are publicly traded are common shares of NU.  The earnings and EPS of each business discussed below do not represent a direct legal interest in the assets and liabilities allocated to such business but rather represent a direct interest in our assets and liabilities as a whole.  EPS by business is a financial measure not recognized under GAAP that is calculated by dividing the Net Income Attributable to Controlling Interest of each business by the weighted average diluted NU common shares outstanding for the period.  The discussion below also includes non-GAAP financial measures referencing our first quarter 2013 and 2012 earnings and EPS excluding certain impacts related to NU's merger with NSTAR.  We use these non-GAAP financial measures to evaluate and to provide details of earnings results by business and to more fully compare and explain our first quarter 2013 and 2012 results without including the impact of these non-recurring items.  Due to the nature and significance of these items on Net Income Attributable to Controlling Interest, we believe that the non-GAAP presentation is more representative of our financial performance and provides additional and useful information to readers of this report in analyzing historical and future performance by business.  These non-GAAP financial measures should not be considered as an alternative to reported Net Income Attributable to Controlling Interest or EPS determined in accordance with GAAP as an indicator of operating performance.

Reconciliations of the above non-GAAP financial measures to the most directly comparable GAAP measures of consolidated diluted EPS and Net Income Attributable to Controlling Interest are included under "Financial Condition and Business Analysis – Overview – Consolidated" in Management's Discussion and Analysis, herein.  

Forward-Looking Statements:  From time to time we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, assumptions of future events, financial performance or growth and other statements that are not historical facts.  These statements are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995.  You can generally identify our forward-looking statements through the use of words or phrases such as "estimate," "expect," "anticipate," "intend," "plan," "project," "believe," "forecast," "should," "could," and other similar expressions.  Forward-looking statements are based on the current expectations, estimates, assumptions or projections of management and are not guarantees of future performance.  These expectations, estimates, assumptions or projections may vary materially from actual results.  Accordingly, any such statements are qualified in their entirety by reference to, and are accompanied by, the following important factors that could cause our actual results to differ materially from those contained in our forward-looking statements, including, but not limited to:

·

the possibility that expected merger synergies will not be realized or will not be realized within the expected time period,

·

cyber breaches, acts of war or terrorism, or grid disturbances,

·

actions or inaction by local, state and federal regulatory and taxing bodies,

·

changes in business and economic conditions, including their impact on interest rates, bad debt expense, and demand for our products and services,

·

changes in weather patterns,

·

changes in laws, regulations or regulatory policy,

·

changes in levels and timing of capital expenditures,

·

disruptions in the capital markets or other events that make our access to necessary capital more difficult or costly,

·

developments in legal or public policy doctrines,

·

technological developments,

·

changes in accounting standards and financial reporting regulations,

·

actions of rating agencies, and

·

other presently unknown or unforeseen factors.  

Other risk factors are detailed in our reports filed with the SEC and updated as necessary, and we encourage you to consult such disclosures.

All such factors are difficult to predict, contain uncertainties that may materially affect our actual results and are beyond our control.  You should not place undue reliance on the forward-looking statements, each speaks only as of the date on which such statement is made, and we undertake no obligation to update any forward-looking statement or statements to reflect events or circumstances after the date on which such statement is made or to reflect the occurrence of unanticipated events.  New factors emerge from time to time and it is not possible for us to predict all of such factors, nor can we assess the impact of each such factor on the business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking

41

statements.  For more information, see Item 1A, Risk Factors, included in this Quarterly Report on Form 10-Q, and in NU’s 2012 Form 10-K.  This Quarterly Report on Form 10-Q and NU’s 2012 Form 10-K also describe material contingencies and critical accounting policies in the accompanying Management’s Discussion and Analysis and Combined Notes to Condensed Consolidated Financial Statements (Unaudited).  We encourage you to review these items.

Financial Condition and Business Analysis

Merger with NSTAR:  

On April 10, 2012, NU and NSTAR completed our merger.  Unless otherwise noted, the results of NSTAR LLC and its subsidiaries, hereinafter referred to as "NSTAR," are included in NU’s financial position, results of operations and cash flows as of and for the three months ended March 31, 2013 throughout this Management's Discussion and Analysis of Financial Condition and Results of Operations.

Executive Summary

The following items in this executive summary are explained in more detail in this combined Quarterly Report on Form 10-Q:  

Results:

The earnings discussion below is for the three months ended March 31, 2013, compared with the same period in 2012:

·

We earned $228.1 million, or $0.72 per share, compared with $99.3 million, or $0.56 per share.  Excluding merger related costs, we earned $229.9 million, or $0.73 per share, compared with $100.4 million, or $0.56 per share.  Improved earnings results in 2013 were due primarily to the inclusion of NSTAR, higher retail electric and firm natural gas sales due primarily to colder weather in the first quarter of 2013, as compared to the first quarter of 2012, higher transmission segment earnings as a result of increased investments in the transmission infrastructure, lower overall operations and maintenance costs and a favorable impact of $13.6 million, or $0.04 per share, from the resolution of a state income tax audit.

·

The addition of NSTAR provided an earnings contribution of $67.5 million for the first quarter of 2013.  Due to the timing of the merger closing, April 10, 2012, NSTAR’s first quarter 2012 results are not reflected in NU’s first quarter 2012 results.

·

Our electric distribution segment, which includes generation, earned $99.5 million, or $0.32 per share, compared with $42 million, or $0.24 per share.  

·

Our transmission segment earned $79.9 million, or $0.25 per share, compared with $46.3 million, or $0.26 per share.

·

Our natural gas distribution segment earned $43.3 million, or $0.14 per share, compared with $14.7 million, or $0.08 per share.  

·

NU parent and other companies earned $5.4 million, or $0.02 per share, compared with net losses of $3.7 million, or $0.02 per share.  Excluding merger related costs, NU parent and other companies earned $7.2 million, or $0.02 per share, compared with net losses of $2.6 million, or $0.02 per share.  

Legislative, Regulatory, Policy and Other Items:

·

On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric.  Approximately 71,000 and 320,000 of CL&P’s and NSTAR Electric's distribution customers, respectively, were without power during or following the blizzard.  The blizzard resulted in estimated deferred storm restoration costs of approximately $93 million.  We believe the storm restoration costs meet the criteria for specific cost recovery in each respective state and, as a result, we do not expect the blizzard to have a material impact on our results of operations.

·

In March 2013, CL&P and NSTAR Electric filed a request with the PURA and DPU, respectively, seeking approval to recover storm restoration costs.  CL&P requested approval to recover approximately $414 million of prudently incurred storm restoration costs, plus carrying costs, related to five major storms, all of which occurred in 2012 and 2011, in distribution rates over a six-year period beginning on December 1, 2014.  NSTAR Electric requested approval to recover approximately $35 million in prudently incurred storm restoration costs, plus carrying costs, related to Tropical Storm Irene and the October snowstorm in distribution rates over a five-year period beginning on January 1, 2014.

Liquidity:

·

Cash and cash equivalents totaled $60.8 million as of March 31, 2013, compared with $45.7 million as of December 31, 2012, while cash capital expenditures totaled $389 million for the first quarter of 2013, compared with $304.3 million for the first quarter of 2012.

·

Cash flows provided by operating activities totaled $410.6 million in the first quarter of 2013, compared with cash flows used in operating activities of $9.1 million in the first quarter of 2012 (amounts are net of RRB payments).  The improved operating cash flows were due primarily to a decrease in storm restoration costs, the addition of NSTAR, the proceeds CYAPC and YAEC

42

received from the DOE in the first quarter of 2013, a decrease in NUSCO Pension Plan cash contributions, and the absence of the February 2012 CL&P customer bill credits.

·

On January 15, 2013, CL&P issued $400 million of 2.5 percent first mortgage bonds that will mature on January 15, 2023.  The proceeds, net of issuance costs, were used to repay CL&P’s revolving credit facility borrowings of $89 million and intercompany loans related to our commercial paper program borrowings of $305.8 million.

·

On May 1, 2013, PSNH redeemed at par approximately $109 million of PCRBs, due to mature in 2021, with short-term debt.  

Overview

Consolidated:  A summary of our earnings by business, which also reconciles the non-GAAP financial measures of consolidated non-GAAP earnings and EPS, as well as EPS by business, to the most directly comparable GAAP measures of consolidated Net Income Attributable to Controlling Interest and diluted EPS, for the first quarters of 2013 and 2012 is as follows:  

	For the Three Months Ended March 31,
	2013 (1)				2012
(Millions of Dollars, Except Per Share Amounts)	Amount		Per Share		Amount		Per Share
Net Income Attributable to Controlling Interest (GAAP)	$	228.1	$	0.72	$	99.3	$	0.56
Regulated Companies	$	222.7	$	0.71	$	103.0	$	0.58
NU Parent and Other Companies		7.2		0.02		(2.6)		(0.02)
Non-GAAP Earnings		229.9		0.73		100.4		0.56
Merger Related Costs (after-tax)		(1.8)		(0.01)		(1.1)		-
Net Income Attributable to Controlling Interest (GAAP)	$	228.1	$	0.72	$	99.3	$	0.56

⁽¹⁾  Results include the operations of NSTAR.  

Excluding the impacts of the merger related costs, our first quarter 2013 earnings increased by $129.5 million, as compared to first quarter 2012, due primarily to the inclusion of NSTAR, higher retail electric and firm natural gas sales due primarily to colder weather in the first quarter of 2013, as compared to the first quarter of 2012, higher transmission segment earnings as a result of increased investments in the transmission infrastructure, lower overall operations and maintenance costs, and a favorable impact of $13.6 million, or $0.04 per share, from the resolution of a state income tax audit.  On an earnings per share basis, the first quarter 2013 NSTAR earnings contribution of $67.5 million ($67.8 million in non-GAAP earnings) was partially offset by the issuance of approximately 136 million common shares to close the merger.  Partially offsetting these favorable earnings impacts were higher depreciation and property tax expense.

Regulated Companies:  Our Regulated companies consist of the electric distribution, natural gas distribution, and transmission segments.  Generation activities of PSNH and WMECO are included in our electric distribution segment.  A summary of our segment earnings for the first quarters of 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(Millions of Dollars)	2013 (1)		2012
Electric Distribution	$	99.5	$	42.0
Transmission		79.9		46.3
Natural Gas Distribution		43.3		14.7
Net Income - Regulated Companies	$	222.7	$	103.0

⁽¹⁾  Results include the operations of NSTAR.  

The higher first quarter 2013 transmission segment earnings, as compared to the first quarter of 2012, were due primarily to the inclusion of the $17.8 million NSTAR Electric transmission business’ earnings, increased investments in the transmission infrastructure, including GSRP, which is under construction in western Massachusetts and northern Connecticut, and the favorable impact from the resolution of a state income tax audit.

The higher first quarter 2013 electric distribution segment earnings, as compared to the first quarter of 2012, were due primarily to the inclusion of the $29.9 million NSTAR Electric distribution business’ earnings, higher retail electric sales due primarily to colder weather in the first quarter of 2013, as compared to the first quarter of 2012, and lower overall operations and maintenance costs.  In addition, we had a favorable impact resulting from the PSNH 2010 distribution rate case decision.  As a result of the decision, the PSNH rates increased effective July 1, 2012.  Partially offsetting these favorable earnings impacts were higher depreciation and property tax expense. For further information regarding NSTAR Electric’s earnings, see "Results of Operations – NSTAR Electric Company and Subsidiaries – Earnings Summary" in this Management's Discussion and Analysis of Financial Condition and Results of Operations.  

The higher first quarter 2013 natural gas distribution segment earnings, as compared to the first quarter of 2012, were due primarily to the inclusion of the $19.3 million NSTAR Gas business’ earnings, higher firm natural gas sales due primarily to colder weather in the first quarter of 2013, as compared to the first quarter of 2012, the favorable impact of the Yankee Gas 2011 rate case decision resulting in the

43

additional increase to annualized rates effective July 1, 2012, and lower interest expense, partially offset by higher depreciation expense and property tax expense.  

A summary of our retail electric GWh sales and percentage changes, as well as changes in CL&P, NSTAR Electric, PSNH and WMECO retail electric GWh sales, and our firm natural gas sales in million cubic feet, as well as percentage changes in Yankee Gas and NSTAR Gas’ sales in million cubic feet, for the first quarter of 2013, as compared to the first quarter 2012, is as follows:

	For the Three Months Ended March 31, 2013 Compared to 2012
	Sales (GWh)		Percentage
NU – Electric	2013 (1)	2012	Increase
Residential	5,803	3,787	53.2%
Commercial	6,570	3,381	94.3%
Industrial	1,298	1,015	28.0%
Other	125	88	42.5%
Total	13,796	8,271	66.8%

	For the Three Months Ended March 31, 2013 Compared to 2012
	CL&P	NSTAR Electric (2)	PSNH	WMECO
Electric	Percentage Increase/ (Decrease)	Percentage Increase/ (Decrease)	Percentage Increase/ (Decrease)	Percentage Increase/ (Decrease)
Residential	9.2 %	4.1 %	4.3 %	5.6 %
Commercial	2.0 %	1.9 %	2.2 %	(1.0)%
Industrial	(4.6)%	(5.2)%	0.6 %	(0.8)%
Other	0.6 %	(10.1)%	(2.7)%	22.6 %
Total	4.7 %	2.0 %	2.8 %	2.1 %

⁽¹⁾

Results include retail electric sales of NSTAR Electric.  

⁽²⁾

Results for NSTAR Electric include its standalone first quarter March 31, 2013 retail electric sales, as compared to 2012.

	For the Three Months Ended March 31, 2013 Compared to 2012
	Sales (million cubic feet)
NU – Firm Natural Gas	2013 (1)	2012
Residential	17,015	5,375
Commercial	16,771	6,382
Industrial	6,829	5,062
Total	40,615	16,819
Total, Net of Special Contracts (2)	39,422	14,744

	For the Three Months Ended March 31, 2013 Compared to 2012
	Yankee Gas	NSTAR Gas (3)
Firm Natural Gas	Percentage Increase/(Decrease)	Percentage Increase
Residential	25.9 %	22.9%
Commercial	21.4 %	16.3%
Industrial	(4.4)%	29.3%
Total	15.1 %	20.6%
Total, Net of Special Contracts (2)	23.2 %

⁽¹⁾

Results include firm natural gas sales of NSTAR Gas.

⁽²⁾

Special contracts are unique to the customers who take service under such an arrangement and generally specify the amount of distribution revenue to be paid to Yankee Gas regardless of the customers’ usage.

⁽³⁾

NSTAR Gas’ sales data for the three months ended March 31, 2013 compared to 2012 has been provided for comparative purposes only.

Weather, fluctuations in fuel costs, conservation measures, and economic conditions affect sales to our customers.  Industrial sales are less sensitive to temperature variations than residential and commercial sales.  Weather impacts electric sales primarily during the summer and natural gas sales during the winter in our service territories (natural gas sales are more sensitive to temperature variations than electric sales).  Customer heating or cooling usage may not directly correlate with historical levels or with the level of degree-days that occur, particularly when weather patterns experienced are consistently colder or warmer.  In addition, our electric and natural gas businesses are sensitive to variations in daily weather, are highly influenced by New England’s seasonal weather variations, and are susceptible to damage from major storms and other natural events and disasters that could adversely affect our ability to provide energy.

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Our consolidated retail electric and firm natural gas sales were higher in the first quarter of 2013, as compared to the first quarter of 2012, due to the inclusion of NSTAR Electric and NSTAR Gas sales.  

Actual retail electric sales for CL&P, NSTAR Electric, PSNH, and WMECO increased in the first quarter of 2013, as compared to 2012, due primarily to the colder weather in the first quarter of 2013, as compared to the first quarter of 2012.  In the first quarter of 2013, heating degree days were 21 percent higher in Connecticut and western Massachusetts, 22 percent higher in the Boston metropolitan area, and 15 percent higher in New Hampshire, as compared to 2012.  On a weather-normalized basis (based on 30-year average temperatures), the average NU combined consolidated total retail electric sales was relatively unchanged in the first quarter of 2013, as compared to 2012, assuming NSTAR Electric had been part of the NU combined electric distribution system for all periods under consideration.  For WMECO, the fluctuations in retail electric sales do not impact earnings as the DPU approved a revenue decoupling mechanism.  Under this decoupling mechanism, WMECO has an overall fixed annual level of distribution delivery service revenues of $132.4 million comprised of customer base rate revenues of$125.4 million and a baseline low income discount recovery of $7 million.  These two mechanisms effectively break the relationship between sales volume and revenues recognized.

Our firm natural gas sales are subject to many of the same influences as our retail electric sales, but have benefitted from lower natural gas prices and customer growth across all three customer classes.  In the first quarter of 2013, excluding the impact of NSTAR Gas sales, actual sales increased, as compared to the first quarter of 2012, due primarily to the colder weather in the first quarter of 2013, as compared to the first quarter of 2012.  On a weather-normalized basis, Yankee Gas’ first quarter 2013 sales also increased due primarily to customer growth, lower cost of natural gas when compared to the cost of other energy sources, the migration of interruptible customers switching to firm service rates, and the addition of gas-fired distributed generation in Yankee Gas’ service territory.

On a weather-normalized basis, the average NU combined consolidated total firm natural gas sales increased 2.6 percent in the first quarter of 2013, as compared to the first quarter of 2012, assuming NSTAR Gas had been part of the NU combined natural gas distribution system for all periods under consideration.

NU Parent and Other Companies:  NU parent and other companies (which includes our competitive businesses held by NU Enterprises and, for the first quarter of 2013, NSTAR LLC) earned $5.4 million in the first quarter of 2013, compared with net losses of $3.7 million in the first quarter of 2012.  Excluding the impact of the merger related costs, NU parent and other companies earned $7.2 million in the first quarter of 2013, compared with net losses of $2.6 million.  Improved results were due primarily to lower interest expense, a lower effective tax rate and the inclusion of NSTAR Communications.

Major Storm Restoration Costs:  A storm must meet certain criteria specific to each state and utility company to be declared a major storm.  Once a storm is declared major, all qualifying expenses incurred during storm restoration efforts, if deemed prudent, are deferred and recovered from customers in future periods.  In Connecticut, qualifying storm restoration costs must exceed $5 million for a storm to be declared a major storm.  In Massachusetts, qualifying storm restoration costs must exceed $1 million for NSTAR Electric and $300,000 for WMECO and an emergency response plan must be initiated for a storm to be declared a major storm.  In New Hampshire, (1) at least 10 percent of customers must be without power with at least 200 concurrent locations requiring repairs (trouble spots), or (2) at least 300 concurrent trouble spots must be reported for a storm to be declared a major storm.  

On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric.  Approximately 71,000 and 320,000 of CL&P’s and NSTAR Electric's distribution customers, respectively, were without power during or following the blizzard.  The blizzard resulted in estimated deferred storm restoration costs of approximately $13 million at CL&P and approximately $80 million at NSTAR Electric.  We believe the storm restoration costs meet the criteria for specific cost recovery in Connecticut and Massachusetts and, as a result, we do not expect the blizzard to have a material impact on CL&P’s or NSTAR Electric’s results of operations.  CL&P and NSTAR Electric will seek recovery of these deferred storm restoration costs through their applicable regulatory recovery process.

Liquidity

Consolidated:  Cash and cash equivalents totaled $60.8 million as of March 31, 2013, compared with $45.7 million as of December 31, 2012.  

On January 15, 2013, CL&P issued $400 million of 2.5 percent first mortgage bonds that will mature on January 15, 2023.  The proceeds, net of issuance costs, were used to repay CL&P’s revolving credit facility borrowings of $89 million and intercompany loans related to our commercial paper program borrowings of $305.8 million.

On May 1, 2013, PSNH redeemed at par approximately $109 million of the 2001 Series C PCRBs that were due to mature in 2021 with short-term debt.  As a result, the PCRBs were recorded as Long-Term Debt - Current Portion.

NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and fund other corporate obligations, such as pension contributions.  The current growth in NU’s transmission construction expenditures utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period.  In addition, NU’s Regulated companies operate in an environment where recovery of its electric and natural gas distribution construction expenditures takes place over an extended period of time.  This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs.  These factors have resulted in NU’s current liabilities exceeding current assets by approximately

45

$1.7 billion, $231 million, $226 million, $34 million and $48 million at NU, CL&P, NSTAR Electric, PSNH, and WMECO, respectively, as of March 31, 2013.

As of March 31, 2013, approximately $914 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months, consisting of $550 million for NU parent, $125 million for CL&P, $109 million for PSNH, $75 million for Yankee Gas, and $55 million for WMECO.  NU, with its strong credit ratings, has several options available in the financial markets to repay or refinance these maturities with the issuance of new long-term debt.  NU, CL&P, NSTAR Electric, PSNH, and WMECO will reduce their short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given our capital requirements and maintenance of our credit rating and profile.  Management expects the future operating cash flows of NU and its subsidiaries, along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.

Cash flows provided by operating activities in the first quarter of 2013 totaled $410.6 million, compared with cash flows used in operating activities of $9.1 million in the first quarter of 2012 (all amounts are net of RRB payments, which are included in financing activities on the accompanying consolidated statements of cash flows).  The improved cash flows were due primarily to the absence in the first quarter of 2013 of approximately $153 million in cash disbursements associated with Tropical Storm Irene and the October snowstorm, the addition of NSTAR, which contributed $138.1 million of operating cash flows (net of RRB payments) in the first quarter of 2013, as well as the $77.9 million in proceeds CYAPC and YAEC received from the DOE in the first quarter of 2013 that were subsequently invested in marketable securities and are expected to benefit CL&P, NSTAR Electric, PSNH and WMECO customers.  Also contributing to the improved operating cash flows was a reduction of NUSCO Pension Plan contributions of $56.9 million in the first quarter of 2013, as compared to the first quarter of 2012, the absence in the first quarter of 2013 of approximately $27 million in 2012 CL&P customer bill credits and the favorable cash flow impacts associated with transmission regulatory tracking mechanisms of $16.1 million. Partially offsetting these favorable impacts was a $19.6 million increase in income taxes paid in the first quarter of 2013, as compared to the first quarter of 2012.  

A summary of the current credit ratings and outlooks by Moody's, S&P and Fitch for senior unsecured debt of NU parent, NSTAR Electric, and WMECO and senior secured debt of CL&P and PSNH is as follows:

	Moody's		S&P		Fitch
	Current	Outlook	Current	Outlook	Current	Outlook
NU Parent	Baa2	Stable	BBB+	Stable	BBB+	Stable
CL&P	A3	Stable	A	Stable	A	Stable
NSTAR Electric	A2	Stable	A-	Stable	A+	Stable
PSNH	A3	Stable	A	Stable	A	Stable
WMECO	Baa2	Stable	A-	Stable	A-	Stable

On February 14, 2013, S&P revised its criteria for rating utility first mortgage bonds, resulting in one-level upgrades of CL&P and PSNH first mortgage bonds by S&P.  

On February 5, 2013, our Board of Trustees approved a common dividend payment of $0.3675 per share, payable March 28, 2013 to shareholders of record as of March 1, 2013.  On April 2, 2013, our Board of Trustees approved a common dividend payment of $0.3675 per share, payable June 28, 2013 to shareholders of record as of May 31, 2013.

In the first quarter of 2013, CL&P, NSTAR LLC, PSNH, and WMECO paid $38 million, $8 million, $17 million, and $10 million, respectively, in common dividends to NU parent.  

The NSTAR Electric RRBs were fully amortized in the first quarter of 2013.  The PSNH and WMECO RRBs are scheduled to fully amortize in the second quarter of 2013.

Cash capital expenditures included on the accompanying consolidated statements of cash flows and described in this "Liquidity" section do not include amounts incurred on capital projects but not yet paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension expense.  A summary of our cash capital expenditures by company for the first quarters of 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(Millions of Dollars)	2013 (1)		2012
CL&P	$	89.4	$	108.8
NSTAR Electric		107.6		N/A
PSNH		65.0		67.1
WMECO		66.3		85.0
Natural Gas		31.2		20.4
NPT		14.9		5.7
Other		14.6		17.3
Total	$	389.0	$	304.3

⁽¹⁾

Results include cash capital expenditures of NSTAR.

46

The increase in our cash capital expenditures was the result of the addition of NSTAR’s capital expenditures for the first quarter of 2013, as compared to the first quarter of 2012.

Business Development and Capital Expenditures

Consolidated:  Our consolidated capital expenditures, including amounts incurred but not paid, cost of removal, AFUDC, and the capitalized portions of pension expense (all of which are non-cash factors), totaled $299.8 million in the first quarter of 2013, compared with $306.5 million in the first quarter of 2012.  These amounts included $5.4 million and $11.6 million in the first quarters of 2013 and 2012, respectively, related to our corporate service companies, NUSCO and RRR.

Transmission Business:  Overall, transmission business capital expenditures increased by $4.8 million in the first quarter of 2013, as compared to the first quarter of 2012.  The first quarter 2013 results reflect the addition of NSTAR Electric's capital expenditures and an increase at NPT, offset by a decrease at WMECO related to the construction of GSRP nearing completion.  A summary of transmission capital expenditures by company for the three months ended March 31, 2013 and 2012 is as follows:  

	For the Three Months Ended March 31,
(Millions of Dollars)	2013 (1)		2012
CL&P	$	44.0	$	40.2
NSTAR Electric		49.3		N/A
PSNH		14.6		15.1
WMECO		17.2		74.6
NPT		16.5		6.9
Total Transmission Segment	$	141.6	$	136.8

⁽¹⁾

Results include transmission capital expenditures of NSTAR Electric.

NEEWS:  GSRP, a project that involves the construction of 115 kV and 345 kV overhead lines by CL&P and WMECO from Ludlow, Massachusetts to Bloomfield, Connecticut, is the first, largest and most complicated project within the NEEWS family of projects.  The $718 million project is expected to be fully placed in service in late 2013.  If all events surrounding completion of the project continue at their current state, the total cost could be approximately five percent lower.  As of March 31, 2013, the project was approximately 95 percent complete and we had placed $440 million in service.  

The Interstate Reliability Project, which includes CL&P’s construction of an approximately 40-mile, 345 kV overhead line from Lebanon, Connecticut to the Connecticut-Rhode Island border in Thompson, Connecticut where it will connect to transmission enhancements being constructed by National Grid, is our second major NEEWS project.  All siting applications have been filed by CL&P and National Grid.  On January 2, 2013, the Connecticut Siting Council issued a final decision and order approving the Connecticut portion of the project.  Decisions in Rhode Island and Massachusetts are expected between the end of 2013 and early 2014.  The $218 million project is expected to be placed in service in late 2015.  

Included as part of NEEWS are associated reliability related projects, approximately $72 million of which have been placed in service and approximately $24 million of which are in various phases of construction and will continue to go into service through 2013.  

Through March 31, 2013, CL&P and WMECO had capitalized $225 million and $531 million, respectively, in costs associated with NEEWS, of which $13 million and $12.9 million, respectively, were capitalized in the first quarter of 2013.  

Greater Hartford Central Connecticut Project (GHCC):  In August 2012, ISO-NE presented its preliminary needs analysis for the GHCC to the ISO-NE Planning Advisory Committee.  The results showed severe thermal overloads and voltage violations in each of the four study areas now and in the near future.  A combination of 345 kV and 115 kV transmission solutions are being considered to address these reliability concerns and a set of preferred solutions are expected to be identified by ISO-NE in late 2013 or early 2014.  We included approximately $300 million in our five-year capital program for future projects being identified to address these reliability concerns, which have recently been confirmed by ISO-NE.

Cape Cod Reliability Projects:  Transmission projects serving Cape Cod in the Southeastern Massachusetts (SEMA) reliability region consist of an expansion and upgrade of NSTAR Electric's existing transmission infrastructure including construction of a new 345 kV transmission line that will cross the Cape Cod Canal and associated 115 kV upgrades in the center of Cape Cod (Lower SEMA Transmission Project) and related 115 kV projects (Mid-Cape Project).  All regulatory licensing and permitting is complete for the Lower SEMA Transmission Project and construction commenced in September 2012.  The 345 kV line is expected to be energized by mid-2013 and the 115 kV line upgrades are expected to be completed in late 2013.  The Mid-Cape Project is scheduled to be completed in 2017.  The total estimated construction cost for the Cape Cod projects is approximately $150 million.

Northern Pass:  Northern Pass is NPT's planned HVDC transmission line from the Québec-New Hampshire border to Franklin, New Hampshire and an associated alternating current radial transmission line between Franklin and Deerfield, New Hampshire.  Northern Pass will interconnect at the Québec-New Hampshire border with a planned HQ HVDC transmission line.  We estimate the costs of the Northern Pass transmission project will be approximately $1.2 billion (including capitalized AFUDC) and we believe the project will be completed in mid-2017.  

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Distribution Business:  A summary of distribution capital expenditures by company for the first quarters of 2013 and 2012 is as follows:

	For the Three Months Ended March 31,
(Millions of Dollars)	2013 (1)		2012 (2)
CL&P:
Basic Business	$	13.2	$	23.3
Aging Infrastructure		29.0		49.0
Load Growth		17.0		24.8
Total CL&P		59.2		97.1
NSTAR Electric:
Basic Business		15.6		N/A
Aging Infrastructure		27.3		N/A
Load Growth		1.9		N/A
Total NSTAR Electric		44.8		N/A
PSNH:
Basic Business		3.8		5.3
Aging Infrastructure		7.8		9.1
Load Growth		4.6		4.2
Total PSNH		16.2		18.6
WMECO:
Basic Business		0.5		3.9
Aging Infrastructure		4.3		3.4
Load Growth		1.5		2.2
Total WMECO		6.3		9.5
Total - Electric Distribution (excluding Generation)		126.5		125.2
Total - Natural Gas		25.5		16.3
Other Distribution		-		0.3
Total Electric and Natural Gas		152.0		141.8
PSNH Generation:
Clean Air Project		0.2		13.4
Other		0.5		2.8
Total PSNH Generation		0.7		16.2
WMECO Generation		0.1		0.1
Total Distribution Segment	$	152.8	$	158.1

⁽¹⁾

Includes the electric and natural gas distribution capital expenditures of NSTAR.

⁽²⁾

The prior period amounts have been reclassified to conform to current period presentation.  

For the electric distribution business, basic business includes the purchase of meters, tools, vehicles, information technology, transformer replacements, equipment facilities, and the relocation of plant.  Aging infrastructure relates to reliability and the replacement of overhead lines, plant substations, underground cable replacement, and equipment failures.  Load growth includes requests for new business and capacity additions on distribution lines and substation additions and expansions.  

CL&P System Resiliency Plan:  On January 16, 2013, PURA approved the $300 million plan CL&P filed to improve the resiliency of its electric distribution system.  The plan includes vegetation management (both enhanced tree trimming and trimming on a shorter cycle), structural hardening (strengthening field structures through upgrades to the current structure design and material standards as well as upgrades to the poles and conductors), and electrical hardening (upgrading electrical distribution conductors and protective devices on overhead circuits).  CL&P expects to complete the plan in five years in two separate phases.  The estimated cost of Phase 1 of the plan, which will be primarily focused on vegetation management, is $32 million in 2013 and $53 million in 2014.  The estimated cost of Phase 2 of the plan is the remaining $215 million over the period from 2015 through 2017.

FERC Regulatory Issues

FERC Base ROE Complaint:  On September 30, 2011, several New England state attorneys general, state regulatory commissions, consumer advocates and other parties filed a joint complaint with the FERC under Sections 206 and 306 of the Federal Power Act alleging that the base ROE used in calculating formula rates for transmission service under the ISO-NE Open Access Transmission Tariff by New England transmission owners, including CL&P, NSTAR Electric, PSNH and WMECO, is unjust and unreasonable.  The complainants asserted that the current 11.14 percent rate, which became effective in 2006, is excessive due to changes in the capital markets and are seeking an order to reduce the rate, which would be effective October 1, 2011.  In response, the New England transmission owners filed testimony and analysis based on standard FERC methodology and precedent, demonstrating that the base ROE of 11.14 percent remained just and reasonable.  The FERC set the case for trial before a FERC administrative law judge after settlement negotiations were unsuccessful in August 2012.  

As part of the pre-trial process, on April 17, 2013, the complainants, the Massachusetts municipal electric utilities (late intervenors to the case), and the FERC trial staff updated their respective ROE analyses, which demonstrated a base ROE of approximately 8.9 percent.  The New England transmission owners also filed an updated analysis, including a supplement on April 26, 2013, that

48

continues to demonstrate that the current ROE of 11.14 percent remains within an updated range of reasonableness of 7.3 percent to 13.2 percent.  Hearings on this complaint are scheduled to commence on May 6, 2013 and the trial judge’s recommended decision is due in September 2013.  A decision from FERC commissioners is expected in 2014.  Refunds to customers, if any, as a result of a reduction in the NU transmission companies’ base ROE would be for the period October 1, 2011 through December 31, 2012.

On December 27, 2012, several additional parties filed a separate complaint concerning the New England transmission owners' base ROE with the FERC.  This new complaint seeks to reduce the New England transmission owners’ base ROE effective January 1, 2013, effectively extending the refund period for an additional 15 months, and to consolidate this new complaint with the joint complaint filed on September 30, 2011.  The New England transmission owners have asked the FERC to reject this new complaint.  The FERC has not yet acted on this request.

As of March 31, 2013, CL&P, NSTAR Electric, PSNH, and WMECO had approximately $2.1 billion of aggregate shareholder equity invested in their transmission facilities.  As a result, each 10 basis point change in the authorized base ROE would change annual consolidated earnings by an approximate $2.1 million.  We cannot at this time predict the ultimate outcome of this proceeding or the estimated impact on CL&P’s, NSTAR Electric’s, PSNH’s, or WMECO’s respective financial position, results of operations or cash flows.

Regulatory Developments and Rate Matters

The Regulated companies' distribution rates are set by their respective state regulatory commissions, and their tariffs include mechanisms for periodically adjusting their rates.  Other than as described below, for the first quarter of 2013, changes made to the Regulated companies’ rates did not have a material impact on their earnings, financial position, or cash flows.  For further information, see "Financial Condition and Business Analysis – Regulatory Developments and Rate Matters" included in Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations," of the NU 2012 Form 10-K.

Major Storms:

2013, 2012 and 2011 Major Storms:  In 2012 and 2011, CL&P, NSTAR Electric, PSNH and WMECO each experienced significant storms that impacted their service territories, including Tropical Storm Irene, the October snowstorm, and Storm Sandy.

On February 8, 2013, a blizzard caused damage to CL&P’s and NSTAR Electric’s electric delivery systems.  Approximately 71,000 and 320,000 of CL&P’s and NSTAR Electric's distribution customers, respectively, were without power as a result of damages caused by this blizzard.  In addition to the blizzard, a major storm impacted CL&P’s service territory in the first quarter of 2013.

As of March 31, 2013, the estimated storm restoration costs deferred for future recovery at CL&P, NSTAR Electric, PSNH, and WMECO were as follows:

(Millions of Dollars)	2012 and 2011	2013	Total
CL&P	$ 465.3	$ 32.4	$ 497.7
NSTAR Electric	65.4	80.4	145.8
PSNH	33.3	2.6	35.9
WMECO	35.9	-	35.9
Total	$ 599.9	$ 115.4	$ 715.3

The magnitude of these storm restoration costs met the criteria for cost deferral in Connecticut, New Hampshire, and Massachusetts and as a result, the storms had no material impact on the results of operations of CL&P, NSTAR Electric, PSNH and WMECO.  We believe our response to all of these storms was prudent and therefore we believe it is probable that CL&P, NSTAR Electric, PSNH and WMECO will be allowed to recover the deferred storm restoration costs.  Each operating company will seek recovery of its estimated deferred storm restoration costs through its applicable regulatory recovery process.  

Connecticut March 2013 Storm Filing:  On March 28, 2013, CL&P filed a request with PURA for approval to recover the restoration costs of five major storms, all of which occurred in 2012 and 2011.  CL&P requested approval of approximately $462 million in prudently incurred storm restoration costs.  Of that amount, approximately $414 million is subject to recovery in rates after giving effect to CL&P’s agreement to forego the recovery of $40 million of deferred storm restoration costs associated with Tropical Storm Irene and the October snowstorm under the merger-related PURA-approved Connecticut comprehensive settlement agreement (Connecticut settlement agreement), as well as an existing storm reserve fund balance of approximately $8 million.  The storm reserve fund balance is an accumulation of amounts previously collected from customers through CL&P’s existing distribution rate structure.  CL&P is seeking to recover the $414 million, plus carrying costs, in its distribution rates over a six-year period beginning on December 1, 2014, in accordance with the Connecticut settlement agreement.

Massachusetts March 2013 Storm Filing:  On March 1, 2013, NSTAR Electric filed a request with the DPU for approval to recover approximately $35 million of prudently incurred storm restoration costs, plus carrying costs, related to Tropical Storm Irene and the October snowstorm.  NSTAR Electric is seeking to recover these costs in its distribution rates over a five-year period beginning on January 1, 2014 in accordance with the merger-related DPU-approved Massachusetts comprehensive settlement agreement.  

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NSTAR Electric intends to file a proposal with the DPU in the latter half of 2013 for approval to recover the estimated deferred storm restoration costs, which was estimated to be approximately $108 million as of March 31, 2013, related to Storm Sandy, the February 2013 blizzard, and other 2012 storms.

New Hampshire:  On April 30, 2013, PSNH filed a request with the NHPUC to increase distribution rates by $12.6 million, effective July 1, 2013.  The increase primarily consists of $7.7 million associated with net plant additions and a $5 million increase to the current level of funding for the Major Storm Cost reserve.  The requested items are consistent with the NHPUC approved 2010 distribution rate case decision.  We expect the NHPUC to issue an order on PSNH’s request in June 2013.  

Critical Accounting Policies

The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and, at times, difficult, subjective or complex judgments.  Changes in these estimates, assumptions and judgments, in and of themselves, could materially impact our financial position, results of operations or cash flows.  Our management communicates to and discusses with the Audit Committee of our Board of Trustees significant matters relating to critical accounting policies.  Our critical accounting policies that we believed were the most critical in nature were reported in NU’s 2012 Form 10-K.  There have been no material changes with regard to these critical accounting policies.  

Other Matters

Contractual Obligations and Commercial Commitments:  There have been no material contractual obligations identified and no material changes with regard to the contractual obligations and commercial commitments previously disclosed in the NU 2012 Form 10-K.

Web Site:  Additional financial information is available through our web site at www.nu.com.

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RESULTS OF OPERATIONS – NORTHEAST UTILITIES AND SUBSIDIARIES

The following table provides the amounts and variances in operating revenues and expense line items for the consolidated statements of income for NU included in this Quarterly Report on Form 10-Q for the three months ended March 31, 2013 and 2012.  The three months ended March 31, 2013 amounts include the operations of NSTAR:  

			Operating Revenues and Expenses
			For the Three Months Ended March 31,
(Millions of Dollars)			2013		2012		Increase		Percent
Operating Revenues			$	1,995.0	$	1,099.6	$	895.4	81.4	%
Operating Expenses:
	Purchased Power, Fuel and Transmission			747.8		395.3		352.5	89.2
	Operations and Maintenance			346.1		262.0		84.1	32.1
	Depreciation			155.0		80.8		74.2	91.8
	Amortization of Regulatory Assets, Net			54.0		5.4		48.6	(a)
	Amortization of Rate Reduction Bonds			34.5		18.3		16.2	88.5
	Energy Efficiency Programs			105.8		37.3		68.5	(a)
	Taxes Other Than Income Taxes			132.9		86.1		46.8	54.4
		Total Operating Expenses		1,576.1		885.2		690.9	78.1
Operating Income			$	418.9	$	214.4	$	204.5	95.4	%
(a)		Percent greater than 100 percent not shown as it is not meaningful.

Operating Revenues
		For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012		Increase		Percent
Electric Distribution		$	1,374.2	$	786.0	$	588.2	74.8	%
Natural Gas Distribution			361.8		139.0		222.8	(a)
	Total Distribution		1,736.0		925.0		811.0	87.7
Transmission			239.5		162.8		76.7	47.1
	Total Regulated Companies		1,975.5		1,087.8		887.7	81.6
Other and Eliminations			19.5		11.8		7.7	65.3
Total Operating Revenues		$	1,995.0	$	1,099.6	$	895.4	81.4	%
(a) Percent greater than 100 percent not shown as it is not meaningful.

A summary of our retail electric sales and firm natural gas sales were as follows:
	For the Three Months Ended March 31,
	2013	2012	Increase	Percent
Retail Electric Sales in GWh	13,796	8,271	5,525	66.8	%
Firm Natural Gas Sales in Million Cubic Feet	40,615	16,819	23,796	(a)
(a) Percent greater than 100 percent not shown as it is not meaningful.

Our Operating Revenues increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR, which included electric distribution revenues of approximately $530 million, transmission revenues of approximately $60 million, natural gas revenues of approximately $200 million and other revenues of approximately $10 million, and the consolidation of CYAPC and YAEC revenues of approximately $15 million.  Excluding the impact of NSTAR's operations and the consolidation of CYAPC and YAEC, our Operating Revenues increased due to the following:

·

Higher electric distribution segment revenues related to the portions that are included in regulatory commission approved tracking mechanisms that recover certain incurred costs and do not impact earnings.  The tracking mechanisms allow for rates to be changed periodically with overcollections refunded to customers or undercollections recovered from customers in future periods.  The tracked electric distribution revenues increased due primarily to higher retail transmission revenues ($34.6 million), higher energy related revenues ($27.2 million) and higher federally mandated congestion charge delivery-related revenues ($8.6 million).  Partially offsetting these increases were lower generation service revenues ($10.1 million), lower stranded cost recovery revenues ($9.1 million) and lower combined public benefits charge revenues ($4.2 million).

·

An increase in natural gas segment revenues due primarily to a 15.1 percent increase in Yankee Gas' sales volume related to colder weather in the first quarter of 2013, as compared to the first quarter of 2012.

·

The portion of electric distribution segment revenues that impacts earnings increased $15 million due primarily to a 4.7 percent and 2.8 percent increase in sales volume at CL&P and PSNH, respectively, related to colder weather in the first quarter of 2013, as compared to the first quarter of 2012.

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·

Improved transmission segment revenues resulting from a higher level of investment in transmission infrastructure and the recovery of higher overall expenses, which are tracked and result in a related increase in revenues.  The increase in expenses is directly related to the increase in transmission plant, primarily at WMECO, including costs associated with higher property taxes, depreciation and operation and maintenance expenses.

Purchased Power, Fuel and Transmission increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the following:

(Millions of Dollars)	Increase/(Decrease)
The addition of NSTAR's operations	$	321.4
Higher fuel costs and higher transmission costs at PSNH		20.0
An increase related to higher sales at Yankee Gas		13.3
Higher transmission costs, deferred fuel costs and CfD costs, partially offset by   lower GSC supply costs		8.4
Other and eliminations		(10.6)
	$	352.5

Operations and Maintenance increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the following:

(Millions of Dollars)	Increase/(Decrease)
The addition of NSTAR’s operations	$	123.6
Partially offset by lower:
Electric distribution segment costs		(11.9)
General and administrative costs		(7.2)
Transmission segment costs		(5.1)
NU’s unregulated contracting business costs		(2.2)
PSNH’s generation business costs		(1.9)
Natural gas segment operating costs		(1.6)
Other and eliminations		(9.6)
	$	84.1

Depreciation increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR's utility plant balances ($54.2 million) and an increase as a result of the consolidation of CYAPC and YAEC ($13.7 million).  Excluding the impact of NSTAR and the consolidation of CYAPC and YAEC, depreciation increased due primarily to higher utility plant balances resulting from completed construction projects placed into service.

Amortization of Regulatory Assets, Net increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR’s amortization ($45.8 million).

Amortization of RRBs increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR Electric’s amortization ($15.1 million).

Energy Efficiency Programs increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR's operations ($68.6 million).  

Taxes Other Than Income Taxes increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR's operations ($37.8 million).  In addition, there was an increase in property taxes as a result of an increase in Property, Plant and Equipment related to our regulated capital programs and an increase in the property tax rates.

Interest Expense
	For the Three Months Ended March 31,
					Increase/
(Millions of Dollars)	2013		2012		(Decrease)		Percent
Interest on Long-Term Debt	$	85.3	$	60.0	$	25.3	42.2	%
Interest on RRBs		0.6		1.4		(0.8)	(57.1)
Other Interest		(9.6)		5.0		(14.6)	(a)
	$	76.3	$	66.4	$	9.9	14.9	%

(a) Percent greater than 100 percent is not shown as it is not meaningful.

Interest Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the addition of NSTAR's operations ($22 million).  Offsetting the impact of NSTAR’s operations, Other Interest decreased due primarily to a favorable impact from the resolution of a state income tax audit in the first quarter of 2013.

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Other Income, Net
	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Decrease		Percent
Other Income, Net	$	7.8	$	8.8	$	(1.0)	(11.4)	%

Other Income, Net decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower AFUDC related to equity funds ($1.3 million) and lower net gains on the NU supplemental benefit trust in 2013 ($0.6 million), partially offset by the addition of NSTAR ($0.9 million).

Income Tax Expense
	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Increase		Percent
Income Tax Expense	$	120.5	$	56.0	$	64.5	(a)	%

(a) Percent greater than 100 percent is not shown as it is not meaningful.

Income Tax Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in pre-tax earnings ($52.8 million NSTAR, $12.8 million CL&P and $4.6 million other affiliates), partially offset by a favorable impact from the resolution of a state income tax audit ($4.8 million).  

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RESULTS OF OPERATIONS – THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY

The following table provides the amounts and variances in operating revenues and expense line items for the consolidated statements of income for CL&P included in this Quarterly Report on Form 10-Q for the three months ended March 31, 2013 and 2012:  

			Operating Revenues and Expenses
			For the Three Months Ended March 31,
(Millions of Dollars)			2013		2012		Increase/		Percent
							(Decrease)
Operating Revenues			$	624.1	$	592.0	$	32.1	5.4	%
Operating Expenses:
	Purchased Power and Transmission			229.3		220.9		8.4	3.8
	Operations and Maintenance			108.9		132.9		(24.0)	(18.1)
	Depreciation			42.4		41.1		1.3	3.2
	Amortization of Regulatory Assets, Net			10.8		8.0		2.8	35.0
	Energy Efficiency Programs			22.8		21.9		0.9	4.1
	Taxes Other Than Income Taxes			60.2		55.3		4.9	8.9
		Total Operating Expenses		474.4		480.1		(5.7)	(1.2)
Operating Income			$	149.7	$	111.9	$	37.8	33.8	%

Operating Revenues
CL&P's retail sales were as follows:
	For the Three Months Ended March 31,
	2013	2012	Increase	Percent
Retail Sales in GWh	5,681	5,427	254	4.7	%

CL&P's Operating Revenues increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to:

·

A $26.7 million increase in distribution revenues related to the portions that are included in PURA approved tracking mechanisms that recover certain incurred costs and do not impact earnings.  The tracking mechanisms allow for rates to be changed periodically with overcollections refunded to customers or undercollections recovered from customers in future periods.  The tracked distribution revenues increased due primarily to higher retail transmission revenues ($28.1 million), higher federally mandated congestion charge delivery-related revenues ($8.6 million) and higher other tracked revenues.  Partially offsetting these increases were lower generation service revenues ($10.1 million) and lower combined public benefits charge revenues ($4.2 million).

·

A $10.2 million increase in the portion of distribution revenues that impacts earnings in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to a 4.7 percent increase in sales volume due to colder weather in the first quarter of 2013, as compared to the first quarter of 2012.

·

A $4.8 million increase in transmission revenues resulting from an increased level of investment in transmission infrastructure and the recovery of higher overall expenses, which are subject to tracking mechanisms or processes and result in a related increase in revenues.  The increase in expenses is directly related to the increase in transmission plant, including costs associated with higher property taxes, depreciation, and operation and maintenance expenses.

Purchased Power and Transmission increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the following:

(Millions of Dollars)	Increase/(Decrease)
Transmission Costs	$	17.9
Deferred Fuel Costs		6.3
CfD Costs		5.2
GSC Supply Costs		(15.7)
Purchased Power Contracts		(5.2)
Other		(0.1)
	$	8.4

The increase in transmission costs was the result of an increase in the amortization of a retail transmission deferral.  The decrease in GSC supply costs was due primarily to lower average supply prices.  The GSC supply costs are the contractual amounts CL&P must pay to various suppliers that have been awarded the right to supply SS and LRS load through a competitive solicitation process.  These costs are included in PURA approved tracking mechanisms and do not impact earnings.  

Operations and Maintenance decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower distribution maintenance ($7.9 million).  The mild weather in the first quarter of 2012 allowed CL&P to perform its annual inspections and maintenance ahead of schedule, while the colder than normal weather, as well as two majors storms, in the first quarter of 2013, precluded CL&P from performing these procedures ahead of schedule.  Management expects these routine maintenance procedures to be performed in 2013.  Other costs that impacted the reduction in Operations and Maintenance included lower distribution and

54

transmission business expenses as a result of lower general and administrative expenses ($7.9 million) and lower other routine operating costs.  

Amortization of Regulatory Assets, Net increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower CTA transition costs ($5.3 million) and higher CTA revenues ($3.2 million).  Partially offsetting these impacts were lower retail SBC revenues ($5.2 million).

Taxes Other Than Income Taxes increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in the Connecticut gross earnings tax ($2.6 million) attributable to an increase in gross earnings and an increase in property taxes ($1.9 million) as a result of an increase in Property, Plant and Equipment related to CL&P’s capital program and an increase in the property tax rates.

Interest Expense
	For the Three Months Ended March 31,
					Increase/
(Millions of Dollars)	2013		2012		(Decrease)		Percent
Interest on Long-Term Debt	$	32.6	$	31.5	$	1.1	3.5	%
Other Interest		(2.9)		2.0		(4.9)	(a)
	$	29.7	$	33.5	$	(3.8)	(11.3)	%

(a) Percent greater than 100 percent not shown since it is not meaningful.

Other Interest decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to a favorable impact from the resolution of a state income tax audit in the first quarter of 2013.

Other Income, Net

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Decrease		Percent
Other Income, Net	$	4.2	$	5.3	$	(1.1)	(20.8)	%

Other Income, Net decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower AFUDC related to equity funds ($0.6 million) and lower net gains on the NU Supplemental benefit trust ($0.4 million).

Income Tax Expense

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Increase		Percent
Income Tax Expense	$	39.2	$	29.7	$	9.5	32.0	%

Income Tax Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in pre-tax earnings ($12.8 million), partially offset by a favorable impact from the resolution of a state income tax audit ($2.9 million).

LIQUIDITY

CL&P had cash flows provided by operating activities of $26.4 million in the first quarter of 2013, compared with cash flows used in operating activities of $47.1 million in the first quarter of 2012.  The improved cash flows were due primarily to the absence in the first quarter of 2013 of approximately $132 million in cash disbursements for storm costs associated with Tropical Storm Irene and the October snowstorm in the first quarter of 2012, the absence of approximately $27 million in 2012 CL&P customer bill credits, the favorable cash flow impacts associated with transmission regulatory tracking mechanisms of $16.1 million, and income tax refunds of $1.6 million in the first quarter of 2013, compared with income tax payments of $9.2 million in the first quarter of 2012.  Partially offsetting improved cash flows was the change in traditional working capital amounts principally due to the changes in timing of accounts payable, accounts receivable and accrued liabilities.  

Cash capital expenditures included on the accompanying consolidated statements of cash flows do not include amounts incurred on capital projects but not yet paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension expense.  CL&P’s cash capital expenditures totaled $89.4 million in the first quarter of 2013, compared with $108.8 million in the first quarter of 2012.

On January 15, 2013, CL&P issued $400 million of 2.5 percent first mortgage bonds that will mature on January 15, 2023.  The proceeds, net of issuance costs, were used to repay CL&P’s revolving credit facility borrowings of $89 million and intercompany loans related to NU's commercial paper program borrowings of $305.8 million.

Additional financing activities in the first quarter of 2013 included $38 million in common stock dividends to NU parent and an increase in intercompany short-term borrowings of $111.1 million, which was offset by the $394.8 million pay down of commercial paper and revolver borrowings described above.

CL&P uses available capital resources to fund its construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and fund other corporate obligations.  The current growth in CL&P’s transmission construction expenditures

55

utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period.  In addition, CL&P operates in an environment where recovery of its electric construction expenditures takes place over an extended period of time.  This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs.  These factors have resulted in CL&P’s current liabilities exceeding current assets by approximately $231 million as of March 31, 2013.

As of March 31, 2013, approximately $125 million of CL&P's current liabilities relates to long-term debt that will be paid in the next 12 months.  CL&P, with its strong credit ratings, has several options available in the financial markets to repay or refinance this maturity with the issuance of new long-term debt.  CL&P will reduce its short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given its capital requirements and maintenance of its credit rating and profile.  Management expects the future operating cash flows of CL&P, along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.

56

RESULTS OF OPERATIONS – NSTAR ELECTRIC COMPANY AND SUBSIDIARIES

The following table provides the amounts and variances in operating revenues and expense line items for the consolidated statements of income for NSTAR Electric  included in this Quarterly Report on Form 10-Q for the three months ended March 31, 2013 and 2012:  

			Operating Revenues and Expenses
			For the Three Months Ended March 31,
(Millions of Dollars)			2013		2012		Increase/		Percent
							(Decrease)
Operating Revenues			$	592.3	$	556.5	$	35.8	6.4	%
Operating Expenses:
	Purchased Power and Transmission			214.1		219.0		(4.9)	(2.2)
	Operations and Maintenance			92.3		148.2		(55.9)	(37.7)
	Depreciation			45.4		42.5		2.9	6.8
	Amortization of Regulatory Assets, Net			47.0		23.9		23.1	96.7
	Amortization of Rate Reduction Bonds			15.1		22.6		(7.5)	(33.2)
	Energy Efficiency Programs			51.7		46.9		4.8	10.2
	Taxes Other Than Income Taxes			32.2		30.9		1.3	4.2
		Total Operating Expenses		497.8		534.0		(36.2)	(6.8)
Operating Income			$	94.5	$	22.5	$	72.0	(a)	%
(a) Percent greater than 100 percent not shown as it is not meaningful.

Operating Revenues
NSTAR Electric's retail sales were as follows:
	For the Three Months Ended March 31,
	2013		2012		Increase		Percent
Retail Sales in GWh		5,194		5,090		104	2.0	%

NSTAR Electric's Operating Revenues increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to:

·

A $25 million increase in distribution revenues related to the portions that are included in DPU approved tracking mechanisms that recover certain incurred costs and do not impact earnings.  The tracking mechanisms allow for rates to be changed periodically with overcollections refunded to customers or undercollections recovered from customers in future periods.  This increase primarily related to higher retail transmission revenues ($14.2 million), higher transition revenues ($11.5 million), higher energy efficiency program revenues ($5.8 million), and higher PAM revenues ($1.7 million), partially offset by lower Basic Service revenues ($8.2 million).  

·

A $4.3 million increase in the portion of distribution revenues that impacts earnings.   

Purchased Power and Transmission decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the following:  

(Millions of Dollars)	Increase/(Decrease)
Basic Service Costs	$	(17.9)
Transmission Costs		7.8
Deferred Fuel Costs		4.8
Other		0.4
	$	(4.9)

The decrease in Basic Service costs was due primarily to lower average supply prices.  The increase in transmission costs was due primarily to a higher regional rate leading to higher regional network service costs, as well as higher forward capacity market reliability charges.  The increase in deferred fuel costs was due primarily to lower average supply prices, as compared to the prices projected when Basic Service rates were set.  These costs are included in DPU approved tracking mechanisms and do not impact earnings.

Operations and Maintenance decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to the absence of the cumulative adjustment recorded in 2012 to establish a reserve against the regulatory asset related to Basic Service bad debt costs ($27 million).  In addition, first quarter 2012 adjustments were recognized for changes in accounting estimates related primarily to the allowance for doubtful accounts, workers’ compensation, employee medical benefits, and general liability claims ($18.7 million).  Also contributing to the decrease in costs was a March 2012 substation fire in theBack Bay/Prudential area of Boston ($9.5 million).  

Amortization of Regulatory Assets, Net, increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to higher amortization related to transition costs.

57

Energy Efficiency Programs increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in energy efficiency costs in accordance with the three-year program guidelines established by the DPU.  All costs are fully recovered through DPU tracking mechanisms and therefore do not impact earnings.

Interest Expense

	For the Three Months Ended March 31,
					Increase/
(Millions of Dollars)	2013		2012		(Decrease)		Percent
Interest on Long-Term Debt	$	19.6	$	22.3	$	(2.7)	(12.1)	%
Interest on RRBs		0.4		1.3		(0.9)	(69.2)
Other Interest		(4.1)		(5.8)		1.7	29.3
	$	15.9	$	17.8	$	(1.9)	(10.7)	%

Interest expense decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower average long-term bond rates, partially offset by lower regulatory interest income primarily from deferred transition costs.  

Income Tax Expense

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Increase		Percent
Income Tax Expense	$	31.3	$	2.0	$	29.3	(a)	%

(a) Percent greater than 100 percent not shown as it is not meaningful.

Income Tax Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in pre-tax earnings including state tax impacts ($28.8 million).

EARNINGS SUMMARY

	For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012
Income Before Merger-Related Costs	$	48.1	$	4.5
Merger-Related Costs (after-tax)		-		0.6
Net Income	$	48.1	$	3.9

Excluding the merger-related costs, NSTAR Electric’s 2013 earnings were $43.6 million higher than 2012 due primarily to the absence of 2012 adjustments recorded to establish a reserve against the regulatory asset related to Basic Service bad debt costs ($17 million), and for changes in accounting estimates related primarily to the allowance for doubtful accounts, workers’ compensation, employee medical benefits, and general liability claims ($11.4 million).  Also contributing to the increase was a March 2012 substation fire in theBack Bay/Prudential area of Boston ($4.1 million) and a reserve recorded relating to lost base revenues based on 2012 developments during hearings in the merger proceeding ($3.7 million).  In addition, there were higher transmission revenues in 2013 due to an increased level of investment in transmission infrastructure, as well as higher distribution revenues not included in tracking mechanisms.  These factors are partially offset by higher depreciation and property taxes.  

CAPITAL EXPENDITURES

A summary of capital expenditures, including amounts incurred but not paid, cost of removal, AFUDC, and the capitalized portions of pension expense, is as follows:

	For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012
Transmission	$	49.3	$	32.2
Distribution:
Basic Business		15.6		38.5
Aging Infrastructure		27.3		8.1
Load Growth		1.9		15.8
Total Distribution		44.8		62.4
Total	$	94.1	$	94.6

58

LIQUIDITY

NSTAR Electric had cash flows provided by operating activities of $45.9 million in the first quarter of 2013, compared with $53 million in the first quarter of 2012 (amounts are net of RRB payments, which are included in financing activities).  The decrease in operating cash flows was due primarily to an increase in cash disbursements for storm costs in the first quarter of 2013 associated with the February 2013 blizzard, as compared to cash disbursements for storm costs in the first quarter of 2012 associated with Tropical Storm Irene and the October snowstorm, a $20 million increase in income tax payments in the first quarter of 2013, as compared to the first quarter of 2012, and a $4.3 million increase in pension contributions in the first quarter of 2013, as compared to the first quarter of 2012.

59

RESULTS OF OPERATIONS – PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

The following table provides the amounts and variances in operating revenues and expense line items for the consolidated statements of income for PSNH included in this Quarterly Report on Form 10-Q for the three months ended March 31, 2013 and 2012:  

			Operating Revenues and Expenses
			For the Three Months Ended March 31,
(Millions of Dollars)			2013		2012		Increase/		Percent
							(Decrease)
Operating Revenues			$	273.8	$	243.0	$	30.8	12.7	%
Operating Expenses:
	Purchased Power, Fuel and Transmission			101.0		81.0		20.0	24.7
	Operations and Maintenance			59.7		65.0		(5.3)	(8.2)
	Depreciation			22.6		21.2		1.4	6.6
	Amortization of Regulatory Liabilities, Net			(3.1)		(2.6)		(0.5)	(19.2)
	Amortization of Rate Reduction Bonds			14.8		13.9		0.9	6.5
	Energy Efficiency Programs			3.7		3.6		0.1	2.8
	Taxes Other Than Income Taxes			17.0		15.5		1.5	9.7
		Total Operating Expenses		215.7		197.6		18.1	9.2
Operating Income			$	58.1	$	45.4	$	12.7	28.0	%

Operating Revenues
PSNH's retail sales were as follows:
	For the Three Months Ended March 31,
	2013	2012	Increase	Percent
Retail Sales in GWh	1,992	1,937	55	2.8	%

PSNH's Operating Revenues increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to:

·

A $25 million increase in distribution revenues related to the portions that are included in NHPUC approved tracking mechanisms that recover certain incurred costs and do not impact earnings.  The tracking mechanisms allow for rates to be changed periodically with overcollections refunded to customers or undercollections recovered from customers in future periods.  This increase is related primarily to higher energy related revenues ($27.2 million), higher retail transmission revenues ($4.1 million) and higher purchased power and fuel costs related revenues ($2.6 million).  These higher revenues were partially offset by lower stranded cost recovery revenues ($9.1 million).

·

A $5.3 million increase in the portion of distribution revenues that impacts earnings resulting from the favorable impact of the 2010 rate case decision related to the additional increase to annualized rates that was effective July 1, 2012 and a 2.8 percent increase in sales volume due to colder than normal weather in the first quarter of 2013, as compared to the first quarter of 2012.

·

A $2 million increase in transmission revenues resulting from an increased level of investment in transmission infrastructure and the recovery of higher overall expenses, which are tracked and result in a related increase in revenues.  The increase in expenses is directly related to the increase in transmission plant, including costs associated with higher property taxes, depreciation, and operation and maintenance expenses.

Purchased Power, Fuel and Transmission increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in fuel costs resulting from an increase in sales and an increase in transmission costs resulting from an increase in regional transmission rates leading to higher RNS costs.

Operations and Maintenance decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower general and administrative costs ($1.6 million) and lower maintenance costs at the generation business ($1.9 million).  These lower costs were partially offset by higher routine distribution maintenance costs ($0.4 million).

Other Income, Net

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Decrease		Percent
Other Income, Net	$	1.0	$	2.0	$	(1.0)	(50.0)	%

Other Income, Net decreased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to lower AFUDC related to equity funds.

Income Tax Expense

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Increase		Percent
Income Tax Expense	$	18.0	$	13.4	$	4.6	34.3	%

60

Income Tax Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in pre-tax earnings ($4.3 million).

LIQUIDITY

PSNH had cash flows provided by operating activities of $92.9 million in the first quarter of 2013, compared with operating cash flows of $2.5 million in the first quarter of 2012 (amounts are net of RRB payments, which are included in financing activities).  The improved cash flows were due primarily to a reduction in NUSCO Pension Plan contributions of $52.6 million in the first quarter of 2013, as compared to the first quarter of 2012, income tax refunds of $15.3 million in the first quarter of 2013, compared with income tax payments of $5.2 million in the first quarter of 2012, and the favorable impact of the 2010 rate case decision related to the additional increase to annualized rates that was effective July 1, 2012.  In addition, changes in traditional working capital amounts principally due to the changes in timing of accounts payable and accrued liabilities also contributed to the improved operating cash flows.

61

RESULTS OF OPERATIONS – WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY

The following table provides the amounts and variances in operating revenues and expense line items for the consolidated statements of income for WMECO included in this Quarterly Report on Form 10-Q for the three months ended March 31, 2013 and 2012:  

			Operating Revenues and Expenses
			For the Three Months Ended March 31,
(Millions of Dollars)			2013		2012		Increase/		Percent
							(Decrease)
Operating Revenues			$	125.0	$	114.0	$	11.0	9.6	%
Operating Expenses:
	Purchased Power and Transmission			40.1		40.5		(0.4)	(1.0)
	Operations and Maintenance			20.9		22.6		(1.7)	(7.5)
	Depreciation			9.0		7.7		1.3	16.9
	Amortization of Regulatory Assets/(Liabilities), Net			0.1		(0.3)		0.4	(a)
	Amortization of Rate Reduction Bonds			4.7		4.4		0.3	6.8
	Energy Efficiency Programs			8.3		5.5		2.8	50.9
	Taxes Other Than Income Taxes			6.3		4.9		1.4	28.6
		Total Operating Expenses		89.4		85.3		4.1	4.8
Operating Income			$	35.6	$	28.7	$	6.9	24.0	%
(a) Percent greater than 100 percent not shown as it is not meaningful.

Operating Revenues
WMECO's retail sales were as follows:
	For the Three Months Ended March 31,
	2013	2012	Increase	Percent
Retail Sales in GWh	929	911	18	2.1	%

WMECO's Operating Revenues increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to:

·

A $7.9 million increase in transmission revenues resulting from an increased level of investment in transmission infrastructure, primarily related to the NEEWS projects, and the recovery of higher overall expenses, which are tracked and result in a related increase in revenues.  The increase in expenses is directly related to the increase in transmission plant, including costs associated with higher property taxes, depreciation, and operation and maintenance expenses.

·

A $5.3 million increase in distribution revenues related to the portions that are included in DPU approved tracking mechanisms that recover certain incurred costs and do not impact earnings.  The tracking mechanisms allow for rates to be changed periodically with overcollections refunded to customers or undercollections recovered from customers in future periods.  Included in these amounts are Basic Service, pension, transition and energy efficiency program costs.  

Operations and Maintenance decreased in the first quarter of 2013, as compared to the first quarter of 2012, due to lower distribution general and administrative expenses ($1 million) and lower uncollectible expenses ($1 million).  Partially offsetting these decreases was an increase related to higher pension costs ($1.3 million), which are recovered through DPU approved tracking mechanisms and have no earnings impact.

Depreciation increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to higher utility plant balances resulting from completed construction projects placed into service related to WMECO's capital programs.

Energy Efficiency Programs increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in expenses attributable to an increase in spending in accordance with the three-year program guidelines established by the DPU.  All costs are fully recovered through DPU tracking mechanisms and therefore do not impact earnings.

Taxes Other Than Income Taxes increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in property taxes as a result of an increase in Property, Plant and Equipment related to WMECO’s capital program and an increase in the property tax rates.

Income Tax Expense

	For the Three Months Ended March 31,
(Millions of Dollars)	2013		2012		Increase		Percent
Income Tax Expense	$	11.7	$	9.2	$	2.5	27.2	%

Income Tax Expense increased in the first quarter of 2013, as compared to the first quarter of 2012, due primarily to an increase in pre-tax earnings ($2.4 million).

62

LIQUIDITY

WMECO had cash flows provided by operating activities of $66.3 million in the first quarter of 2013, compared with operating cash flows of $0.7 million in the first quarter of 2012 (amounts are net of RRB payments, which are included in financing activities).  The improved cash flows were due primarily to income tax refunds of $26.6 million in the first quarter of 2013, compared with income tax refunds of $0.8 million in the first quarter of 2012, and the absence in the first quarter of 2013 of $14.4 million in cash disbursements for storm costs made in the first quarter of 2012.  In addition, changes in traditional working capital amounts principally due to the changes in timing of accounts payable and accrued liabilities contributed to the improved operating cash flows.

63

ITEM 3.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk Information

Commodity Price Risk Management:  Our Regulated companies enter into energy contracts to serve our customers and the economic impacts of those contracts are passed on to our customers.  Accordingly, the Regulated companies have no exposure to loss of future earnings or fair values due to these market risk-sensitive instruments.  The remaining unregulated wholesale portfolio held by Select Energy includes contracts that are market risk-sensitive, including a wholesale energy sales contract through December 2013 with an agency comprised of municipalities.  As Select Energy's contract volumes are winding down, and as the wholesale energy sales contract is substantially hedged against price risks, we have limited exposure to commodity price risks.  We have not entered into any energy contracts for trading purposes.  

Other Risk Management Activities

Interest Rate Risk Management: We manage our interest rate risk exposure in accordance with our written policies and procedures by maintaining a mix of fixed and variable rate long-term debt.  

Credit Risk Management: Credit risk relates to the risk of loss that we would incur as a result of non-performance by counterparties pursuant to the terms of our contractual obligations.  We serve a wide variety of customers and suppliers that include independent power producers, industrial companies, gas and electric utilities, oil and gas producers, financial institutions, and other energy marketers.  Margin accounts exist within this diverse group, and we realize interest receipts and payments related to balances outstanding in these margin accounts.  This wide customer and supplier mix generates a need for a variety of contractual structures, products and terms that, in turn, require us to manage the portfolio of market risk inherent in those transactions in a manner consistent with the parameters established by our risk management process.

If the respective unsecured debt ratings of NU parent were reduced to below investment grade by either Moody’s or S&P, certain of NU’s contracts would require additional collateral to be provided to counterparties and independent system operators.  If such an event occurred as of March 31, 2013, NU would have been required to provide additional collateral.  NU would have been and remains able to provide that collateral.  

For further information on cash collateral deposited and posted with counterparties as well as any cash collateral netted against the fair value of the related derivative contracts, see Note 4, "Derivative Instruments," to the consolidated financial statements.  

We have provided additional disclosures regarding interest rate risk management and credit risk management in Part II, Item 7A, "Quantitative and Qualitative Disclosures about Market Risk," in NU's 2012 Form 10-K, which is incorporated herein by reference. There have been no additional risks identified and no material changes with regard to the items previously disclosed in the NU 2012 Form 10-K.

ITEM 4.

CONTROLS AND PROCEDURES

Management, on behalf of NU, CL&P, NSTAR Electric, PSNH and WMECO, evaluated the design and operation of the disclosure controls and procedures as of March 31, 2013 to determine whether they are effective in ensuring that the disclosure of required information is made timely and in accordance with the Securities Exchange Act of 1934 and the rules and regulations of the SEC.  This evaluation was made under management's supervision and with management's participation, including the principal executive officers and principal financial officer as of the end of the period covered by this Quarterly Report on Form 10-Q.  There are inherent limitations of disclosure controls and procedures, including the possibility of human error and the circumventing or overriding of the controls and procedures.  Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives.  The principal executive officers and principal financial officer have concluded, based on their review, that the disclosure controls and procedures of NU, CL&P, NSTAR Electric, PSNH and WMECO are effective to ensure that information required to be disclosed by us in reports filed under the Securities Exchange Act of 1934 (i) is recorded, processed, summarized, and reported within the time periods specified in SEC rules and regulations and (ii) is accumulated and communicated to management, including the principal executive officers and principal financial officer, as appropriate to allow timely decisions regarding required disclosures.

There have been no changes in internal controls over financial reporting for NU, CL&P, NSTAR Electric, PSNH and WMECO during the quarter ended March 31, 2013, other than changes resulting from the April 10, 2012 merger with NSTAR, that have materially affected, or are reasonably likely to materially affect, internal controls over financial reporting.  

64

PART II.  OTHER INFORMATION

ITEM 1.

LEGAL PROCEEDINGS

We are parties to various legal proceedings.  We have identified these legal proceedings in Part I, Item 3, "Legal Proceedings," and elsewhere in our 2012 Form 10-K, which disclosures are incorporated herein by reference.  There have been no additional legal proceedings identified and no material changes with regard to the legal proceedings previously disclosed in our 2012 Form 10-K.

ITEM 1A.

RISK FACTORS

We are subject to a variety of significant risks in addition to the matters set forth under "Forward-Looking Statements," in Item 2, "Management's Discussion and Analysis of Financial Condition and Results of Operations," of this Quarterly Report on Form 10-Q.  We have identified a number of these risk factors in Item 1A, "Risk Factors," in our 2012 Form 10-K, which risk factors are incorporated herein by reference.  These risk factors should be considered carefully in evaluating our risk profile.  There have been no additional risk factors identified and no material changes with regard to the risk factors previously disclosed in our 2012 Form 10-K.

ITEM 2.

UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table discloses purchases of shares of our common stock made by us or on our behalf for the periods shown below.

Period	Total Number of Shares Purchased		Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans and Programs (at month end)
January 1 – January 31, 2013	9,895	$	39.22	-	-
February 1 – February 28, 2013	20,091		41.29	-	-
March 1 – March 31, 2013	425,736		42.69	-	-
Total	455,722	$	42.55	-	-

65

ITEM 6.

EXHIBITS

_{Exhibit No.}

_Description

Listing of Exhibits (NU)

12

Ratio of Earnings to Fixed Charges

31

Certification of Thomas J. May, President and Chief Executive Officer of Northeast Utilities, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

31.1

Certification of James J. Judge, Executive Vice President and Chief Financial Officer of Northeast Utilities, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

32

Certification of Thomas J. May, President and Chief Executive Officer of Northeast Utilities and James J. Judge, Executive Vice President and Chief Financial Officer of Northeast Utilities, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

Listing of Exhibits (CL&P)

12

Ratio of Earnings to Fixed Charges

31

Certification of Leon J. Olivier, Chief Executive Officer of The Connecticut Light and Power Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes- Oxley Act of 2002, dated May 3, 2013

31.1

Certification of James J. Judge, Executive Vice President and Chief Financial Officer of The Connecticut Light and Power Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

32

Certification of Leon J. Olivier, Chief Executive Officer of The Connecticut Light and Power Company and James J. Judge, Executive Vice President and Chief Financial Officer of The Connecticut Light and Power Company, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

Listing of Exhibits (NSTAR Electric)

12

Ratio of Earnings to Fixed Charges

31

Certification of Leon J. Olivier, Chief Executive Officer of NSTAR Electric Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

31.1

Certification of James J. Judge, Executive Vice President and Chief Financial Officer of NSTAR Electric Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

32

Certification of Leon J. Olivier, Chief Executive Officer of NSTAR Electric Company and James J. Judge, Executive Vice President and Chief Financial Officer of NSTAR Electric Company, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

Listing of Exhibits (PSNH)

12

Ratio of Earnings to Fixed Charges

31

Certification of Leon J. Olivier, Chief Executive Officer of Public Service Company of New Hampshire, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes- Oxley Act of 2002, dated May 3, 2013

31.1

Certification of James J. Judge, Executive Vice President and Chief Financial Officer of Public Service Company of New Hampshire, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

32

Certification of Leon J. Olivier, Chief Executive Officer of Public Service Company of New Hampshire and James J. Judge, Executive Vice President and Chief Financial Officer of Public Service Company of New Hampshire, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

66

Listing of Exhibits (WMECO)

12

Ratio of Earnings to Fixed Charges

31

Certification of Leon J. Olivier, Chief Executive Officer of Western Massachusetts Electric Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes- Oxley Act of 2002, dated May 3, 2013

31.1

Certification of James J. Judge, Executive Vice President and Chief Financial Officer of Western Massachusetts Electric Company, required by Rule 13a-14(a)/15d-14(a) of the Securities Exchange Act of 1934, as amended, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

32

Certification of Leon J. Olivier, Chief Executive Officer of Western Massachusetts Electric Company and James J. Judge, Executive Vice President and Chief Financial Officer of Western Massachusetts Electric Company, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated May 3, 2013

Listing of Exhibits (NU, CL&P, NSTAR Electric, PSNH, WMECO)

101.INS

XBRL Instance Document

101.SCH

XBRL Taxonomy Extension Schema

101.CAL

XBRL Taxonomy Extension Calculation

101.DEF

XBRL Taxonomy Extension Definition

101.LAB

XBRL Taxonomy Extension Labels

101.PRE

XBRL Taxonomy Extension Presentation

67

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	NORTHEAST UTILITIES
May 3, 2013	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and
		Chief Accounting Officer

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	THE CONNECTICUT LIGHT AND POWER COMPANY
May 3, 2013	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and
		Chief Accounting Officer

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	NSTAR ELECTRIC COMPANY
May 3, 2013	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and
		Chief Accounting Officer

68

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
May 3, 2013	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and
		Chief Accounting Officer

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	WESTERN MASSACHUSETTS ELECTRIC COMPANY
May 3, 2013	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and
		Chief Accounting Officer

69

EX-12

Northeast Utilities												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Three Months
		Ended
		March 31,	For the Years Ended December 31,
		2013 (a)		2012 (a)		2011		2010		2009		2008
Earnings, as defined:
Net income	$	229,968	$	533,077	$	400,513	$	394,107	$	335,592	$	266,387
Income tax expense		120,487		274,926		170,953		210,409		179,947		105,661
Equity in earnings of regional nuclear
generating and transmission companies		(299)		(1,154)		(671)		(1,429)		(1,762)		(1,637)
Dividends received from regional equity investees		261		733		940		1,488		3,794		1,017
Fixed charges, as below		82,029		353,616		275,948		263,393		296,764		304,374
Less: Interest capitalized (including AFUDC)		(827)		(5,261)		(11,758)		(10,165)		(5,929)		(17,797)
Preferred dividend security requirements of
consolidated subsidiaries		(3,133)		(11,715)		(9,265)		(10,170)		(9,265)		(9,265)
Total earnings, as defined	$	428,486	$	1,144,222	$	826,660	$	847,633	$	799,141	$	648,740
Fixed charges, as defined:
Interest on long-term debt (b)	$	85,295	$	316,987	$	231,630	$	231,089	$	224,712	$	193,883
Interest on rate reduction bonds		611		6,168		8,611		20,573		36,524		50,231
Other interest (c)		(9,651)		6,790		10,184		(14,371)		12,401		25,031
Rental interest factor		1,814		6,695		4,500		5,767		7,933		8,167
Preferred dividend security requirements of
consolidated subsidiaries		3,133		11,715		9,265		10,170		9,265		9,265
Interest capitalized (including AFUDC)		827		5,261		11,758		10,165		5,929		17,797
Total fixed charges, as defined	$	82,029	$	353,616	$	275,948	$	263,393	$	296,764	$	304,374
Ratio of Earnings to Fixed Charges		5.22		3.24		3.00		3.22		2.69		2.13
(a) The 2013 results include the operations of NSTAR.  The 2012 results include the operations of NSTAR from the date of the merger, April 10, 2012, through December 31, 2012.
(b) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.
(c) For all periods presented, other interest includes interest related to accounting for uncertain tax positions.

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas J. May, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Northeast Utilities (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	Thomas J. May
	Thomas J. May
	President and Chief Executive Officer
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Judge, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Northeast Utilities (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Northeast Utilities (the registrant) on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission (the Report), we, Thomas J. May, President and Chief Executive Officer of the registrant, and James J. Judge, Executive Vice President and Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the registrant.

/s/	Thomas J. May
	Thomas J. May
	President and Chief Executive Officer

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer

Date:  May 3, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-12

The Connecticut Light and Power Company												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Three Months
		Ended
		March 31,	For the Years Ended December 31,
		2013		2012		2011		2010		2009		2008
Earnings, as defined:
Net income	$	85,008	$	209,725	$	250,164	$	244,143	$	216,316	$	191,158
Income tax expense		39,188		94,437		90,033		132,438		118,847		77,852
Equity in earnings of regional nuclear
generating companies		(43)		(40)		(16)		(134)		(282)		(366)
Dividends received from regional equity investees		289		-		-		440		1,520		-
Fixed charges, as below		31,183		139,982		140,311		145,297		163,887		165,170
Less: Interest capitalized (including AFUDC)		(389)		(2,456)		(3,317)		(2,726)		(2,203)		(12,991)
Total earnings, as defined	$	155,236	$	441,648	$	477,175	$	519,458	$	498,085	$	420,823
Fixed charges, as defined:
Interest on long-term debt (a)	$	32,635	$	124,894	$	131,918	$	134,553	$	133,422	$	104,954
Interest on rate reduction bonds		-		-		-		7,542		19,061		29,129
Other interest (b)		(2,941)		8,233		809		(4,357)		3,334		12,163
Rental interest factor		1,100		4,399		4,267		4,833		5,867		5,933
Interest capitalized (including AFUDC)		389		2,456		3,317		2,726		2,203		12,991
Total fixed charges, as defined	$	31,183	$	139,982	$	140,311	$	145,297	$	163,887	$	165,170
Ratio of Earnings to Fixed Charges		4.98		3.16		3.40		3.58		3.04		2.55
(a) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.
(b) For all periods presented, other interest includes interest related to accounting for uncertain tax positions.

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Leon J. Olivier, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of The Connecticut Light and Power Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiary, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Judge, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of The Connecticut Light and Power Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiary, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of The Connecticut Light and Power Company (the registrant) on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission (the Report), we, Leon J. Olivier, Chief Executive Officer of the registrant and James J. Judge, Executive Vice President and Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the registrant.

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer

Date:  May 3, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-12

NSTAR Electric Company												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Three Months
		Ended
		March 31,	For the Years Ended December 31,
		2013		2012		2011		2010		2009		2008
Earnings, as defined:
Net income	$	48,122	$	190,242	$	252,494	$	248,575	$	240,691	$	223,897
Income tax expense		31,265		123,966		165,686		162,020		151,224		141,847
Equity in earnings of regional nuclear
generating and transmission companies		(85)		(412)		(501)		(836)		(891)		(820)
Dividends received from regional equity investees		102		286		676		669		1,661		416
Fixed charges, as below		16,549		72,364		76,219		77,902		84,826		103,661
Less: Interest capitalized (including AFUDC)		(113)		(259)		(185)		(108)		76		(1,926)
Total earnings, as defined	$	95,840	$	386,187	$	494,389	$	488,222	$	477,587	$	467,075
Fixed charges, as defined:
Interest on long-term debt (a)	$	19,592	$	87,100	$	90,040	$	90,630	$	83,261	$	76,793
Interest on rate reduction bonds		399		3,585		7,226		11,235		18,833		27,076
Other interest (b)		(4,068)		(20,631)		(27,839)		(30,475)		(24,519)		(9,789)
Rental interest factor		513		2,051		6,607		6,404		7,327		7,655
Interest capitalized (including AFUDC)		113		259		185		108		(76)		1,926
Total fixed charges, as defined	$	16,549	$	72,364	$	76,219	$	77,902	$	84,826	$	103,661
Ratio of Earnings to Fixed Charges		5.79		5.34		6.49		6.27		5.63		4.51
(a) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.
(b) For the years ended December 31, 2011, 2010, 2009 and 2008, other interest includes interest related to accounting for uncertain tax positions.

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Leon J. Olivier, certify that:

1.

I have reviewed this Quarterly Report Form 10-Q of NSTAR Electric Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Judge, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of NSTAR Electric Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NSTAR Electric Company (the registrant) on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission (the Report), we, Leon J. Olivier, Chief Executive Officer of the registrant, and James J. Judge, Executive Vice President and Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the registrant.

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer

Date:  May 3, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-12

Public Service Company of New Hampshire												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Three Months
		Ended
		March 31,	For the Years Ended December 31,
		2013		2012		2011		2010		2009		2008
Earnings, as defined:
Net income	$	28,996	$	96,882	$	100,267	$	90,067	$	65,570	$	58,067
Income tax expense		17,984		60,993		49,945		50,801		31,990		21,996
Equity in earnings of regional nuclear
generating companies		(7)		(8)		(7)		(23)		(50)		(62)
Dividends received from regional equity investees		42		-		-		80		220		-
Fixed charges, as below		12,561		52,769		52,111		54,721		51,227		54,597
Less: Interest capitalized (including AFUDC)		(152)		(1,579)		(7,064)		(6,621)		(3,138)		(2,967)
Total earnings, as defined	$	59,424	$	209,057	$	195,252	$	189,025	$	145,819	$	131,631
Fixed charges, as defined:
Interest on long-term debt (a)	$	11,796	$	46,228	$	36,832	$	36,220	$	33,045	$	32,655
Interest on rate reduction bonds		85		2,687		6,276		9,660		13,128		15,969
Other interest (b)		287		1,313		1,039		1,187		316		1,539
Rental interest factor		241		962		900		1,033		1,600		1,467
Interest capitalized (including AFUDC)		152		1,579		7,064		6,621		3,138		2,967
Total fixed charges, as defined	$	12,561	$	52,769	$	52,111	$	54,721	$	51,227	$	54,597
Ratio of Earnings to Fixed Charges		4.73		3.96		3.75		3.45		2.85		2.41
(a) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.
(b) For the years ended December 31, 2011, 2010 and 2009, other interest includes interest related to accounting for uncertain tax positions.

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Leon J. Olivier, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Public Service Company of New Hampshire (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Judge, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Public Service Company of New Hampshire (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Public Service Company of New Hampshire (the registrant) on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission (the Report), we, Leon J. Olivier, Chief Executive Officer of the registrant, and James J. Judge, Executive Vice President and Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the registrant.

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer

Date:  May 3, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.

EX-12

Western Massachusetts Electric Company												Exhibit 12
Ratio of Earnings to Fixed Charges
(Unaudited)
(Thousands of Dollars)		Three Months
		Ended
		March 31,	For the Years Ended December 31,
		2013		2012		2011		2010		2009		2008
Earnings, as defined:
Net income	$	18,603	$	54,503	$	43,054	$	23,090	$	26,196	$	18,330
Income tax expense		11,698		32,140		23,186		16,325		14,923		10,545
Equity in earnings of regional nuclear
generating companies		(12)		(11)		(4)		(36)		(78)		(101)
Dividends received from regional equity investees		80		-		-		120		419		-
Fixed charges, as below		6,648		28,162		25,079		23,042		20,614		21,910
Less: Interest capitalized (including AFUDC)		(106)		(534)		(534)		(336)		(195)		(1,010)
Total earnings, as defined	$	36,911	$	114,260	$	90,781	$	62,205	$	61,879	$	49,674
Fixed charges, as defined:
Interest on long-term debt (a)	$	5,955	$	23,462	$	20,023	$	17,988	$	14,074	$	13,244
Interest on rate reduction bonds		127		1,229		2,335		3,372		4,335		5,133
Other interest (b)		211		1,943		1,254		479		877		1,256
Rental interest factor		249		994		933		867		1,133		1,267
Interest capitalized (including AFUDC)		106		534		534		336		195		1,010
Total fixed charges, as defined	$	6,648	$	28,162	$	25,079	$	23,042	$	20,614	$	21,910
Ratio of Earnings to Fixed Charges		5.55		4.06		3.62		2.70		3.00		2.27
(a) Interest on long-term debt includes amortized premiums, discounts and capitalized expenses related to indebtedness.
(b) For the years ended December 31, 2009 and 2008, other interest includes interest related to accounting for uncertain tax positions.

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Leon J. Olivier, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Western Massachusetts Electric Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiary, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James J. Judge, certify that:

1.

I have reviewed this Quarterly Report on Form 10-Q of Western Massachusetts Electric Company (the registrant);

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiary, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 3, 2013

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report of Western Massachusetts Electric Company (the registrant) on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission (the Report), we, Leon J. Olivier, Chief Executive Officer of the registrant, and James J. Judge, Executive Vice President and Chief Financial Officer of the registrant, certify, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, that:

1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the registrant.

/s/	Leon J. Olivier
	Leon J. Olivier
	Chief Executive Officer

/s/	James J. Judge
	James J. Judge
	Executive Vice President and Chief Financial Officer

Date:  May 3, 2013

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification of Transmission Expense		$ (2.7)
Reclassification of Energy Expense		37.3
Description of Change in Estimate		Effective January 1, 2012, NSTAR Electric changed its estimates with respect to the allowance for doubtful accounts, incurred but not reported claims on medical benefits, general and workers' compensation liabilities and compensation accruals. The total aggregate impact of these changes in estimates on NSTAR Electric's accompanying consolidated statement of income was a decrease to net income of $11.4 million, after-tax, for the three months ended March 31, 2012.
Description of Consolidation of Yankee Companies	NU consolidates CYAPC and YAEC as CL&P’s, NSTAR Electric’s, PSNH’s and WMECO’s combined ownership interest in each of these entities is greater than 50 percent. Intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and the CYAPC and YAEC companies have been eliminated in consolidation. For CL&P, NSTAR Electric, PSNH and WMECO, the investment in CYAPC and YAEC continue to be accounted for under the equity method.
Immaterial Error Correction		The NSTAR Electric consolidated statement of cash flows was revised to correct an error in the presentation of cash deposits related to the RRBs. The impact of this revision was an increase in investing cash inflows from Other Investing Activities in an amount of $24.8 million and a corresponding increase to financing cash outflows from Retirements of Rate Reduction Bonds for the three months ended March 31, 2012. This revision had no impact on NSTAR Electric’s results of operations or cash balance and is not deemed material, individually or in the aggregate, to the previously issued consolidated financial statements.
The Connecticut Light And Power Company [Member]
Reclassification of Transmission Expense		(2.9)
Reclassification of Energy Expense		22.0
Public Service Company Of New Hampshire [Member]
Reclassification of Transmission Expense		7.9
Reclassification of Energy Expense		3.6
Western Massachusetts Electric Company [Member]
Reclassification of Transmission Expense		1.0
Reclassification of Energy Expense		$ 5.6

XML

Deferred Contractual Obligations & Other (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Loss Contingency, Information about Litigation Matters [Abstract]
Trial Court Ruling To CYAPC	$ 39.7
Trial Court Ruling To YAEC	38.2
Trial Court Ruling To MYAPC	81.7
Increase In Marketable Securities Current Period	77.9
Connecticut Yankee Proceeds Received	39.7
Yankee Atomic Proceeds Received	38.2
Maine Yankee Proceeds Received	81.7
Cumulative CPSL Costs 2006 To 2011	83.0
Bad Debt Service Adder As Of 2011	$ 34.0

XML

MARKETABLE SECURITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items]
Fair Value Of Securities Under Fair Value Option	$ 51.2	$ 47.0
Fair Value, Option, Changes in Fair Value, Gain (Loss)	4.2	3.2
Investments, Debt and Equity Securities [Abstract]
Marketable Securities, Restricted	434.9	340.4
Available For Sale Securities Debt Maturities Fair Value Abstract
Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value	53.4
Available For Sale Securities Debt Maturities After Ten Years Fair Value	97.5
Available For Sale Securities Debt Maturities After One Year Through Five Years Fair Value	63.5
Available For Sale Securities Debt Maturities Within One Year Fair Value	150.8
Available For Sale Securities Debt Maturities Fair Value	365.2
Available For Sale Securities Debt Maturities Amortized Cost Abstract
Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost	62.2
Available For Sale Securities Debt Maturities Within One Year Amortized Cost	150.7
Available For Sale Securities Debt Maturities After Ten Years Amortized Cost	91.2
Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost	51.2
Available For Sale Securities Debt Maturities Amortized Cost	355.3
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	591.1	492.3
Western Massachusetts Electric Company [Member]
Available For Sale Securities Debt Maturities Fair Value Abstract
Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value	4.1
Available For Sale Securities Debt Maturities After Ten Years Fair Value	4.6
Available For Sale Securities Debt Maturities After One Year Through Five Years Fair Value	18.5
Available For Sale Securities Debt Maturities Within One Year Fair Value	30.6
Available For Sale Securities Debt Maturities Fair Value	57.8
Available For Sale Securities Debt Maturities Amortized Cost Abstract
Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost	18.7
Available For Sale Securities Debt Maturities Within One Year Amortized Cost	30.4
Available For Sale Securities Debt Maturities After Ten Years Amortized Cost	4.5
Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost	4.1
Available For Sale Securities Debt Maturities Amortized Cost	57.7
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	57.8	57.7
Fair Value Inputs Level 1 Member
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	346.0	252.7
Fair Value Inputs Level 1 Member | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	3.6	5.2
Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	245.1	239.6
Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	54.2	52.5
US Government Debt Securities Member | Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	78.5	69.9
US Government Debt Securities Member | Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	18.2	18.7
Corporate Bond Securities Member | Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	41.1	33.0
Corporate Bond Securities Member | Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	11.7	7.0
Asset Backed Securities Member | Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	26.4	28.5
Asset Backed Securities Member | Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	9.6	10.9
Municipal Bonds Member | Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	82.6	93.8
Municipal Bonds Member | Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	8.6	11.6
Other Debt Securities Member | Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	16.5	14.4
Other Debt Securities Member | Fair Value Inputs Level 2 [Member] | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	6.1	4.3
Cash And Cash Equivalents Member | Fair Value Inputs Level 1 Member
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	120.1	40.2
Cash And Cash Equivalents Member | Fair Value Inputs Level 1 Member | Western Massachusetts Electric Company [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	3.6	5.2
Mutual Funds [Member] | Fair Value Inputs Level 1 Member
Fair Value Assets And Liabilities Measured On Recurring Basis Abstract
Investments Fair Value Disclosure	225.9	212.5
Debt Securities
Investments, Debt and Equity Securities [Abstract]
Available For Sale Securities Fair Value Disclosure	365.2	279.8
Available-for-sale Securities, Gross Unrealized Gains	10.0	13.3
Available-for-sale Securities, Gross Unrealized Losses	(0.1)	(0.1)
Available For Sale Securities Amortized Cost	355.3	266.6
Debt Securities | Western Massachusetts Electric Company [Member]
Investments, Debt and Equity Securities [Abstract]
Available For Sale Securities Fair Value Disclosure	57.8	57.7
Available-for-sale Securities, Gross Unrealized Gains	0.1	0.1
Available-for-sale Securities, Gross Unrealized Losses	0	(0.1)
Available For Sale Securities Amortized Cost	57.7	57.7
Equity Securities
Investments, Debt and Equity Securities [Abstract]
Available For Sale Securities Fair Value Disclosure	174.7	165.5
Available-for-sale Securities, Gross Unrealized Gains	30.7	20.0
Available For Sale Securities Amortized Cost	$ 144.0	$ 145.5

XML

Guarantees and Indemnifications (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Guarantee Of Financial Obligations Of Npt [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 25.0
Various Subsidiary Surety Bonds And Performance Guarantees Expiring Between 2013 And 2015 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	33.1
Guarantee Of Rocky River Reality And Nusco Lease Payments For Real Estate And Vehicles Expiring 2019 Through 2024 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	19.2
Guarantee Of Nuei Surety Bonds Insurance Bonds And Performance Guarantees [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	67.8
Guarantee Of Ngs Insurance Bond [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	1.0
Guarantee Of Es Boulos Surety Bonds Expiring Upon Project Completion [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	58.4
Guarantee Of Select Energy Wholesale Purchase Contracts [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	8.4
Guarantee Of Debt Of Ne Hydros [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 5.6

XML

DERIVATIVE INSTURMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	$ (108,964,000)		$ (117,194,000)
Derivative Liabilities, Noncurrent	(840,043,000)		(882,654,000)
Derivative Assets Noncurrent	94,970,000		90,612,000
Current Derivative Assets Consolidated	10,500,000		11,400,000
DerivativeCollateralRightToReclaimCash	3,500,000		4,100,000
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total Abstract
Description of Derivative Activity Volume	As of March 31, 2013 and December 31, 2012, NU had approximately 5 thousand MWh and 24 thousand MWh, respectively, of supply volumes remaining in its unregulated wholesale portfolio when expected sales are compared with supply contracts.
Effect Of Fair Value Hedges On Results Of Operations [Abstract]
Notional Amount Of Fair Value Hedge Instruments		263,000,000
Interest Realized In Earnings On Fair Value Hedge		2,500,000
Derivative Credit Risk Related Contingent Features Abstract
Derivative Net Liability Position Aggregate Fair Value	(8,400,000)		(15,300,000)
Collateral Already Posted Aggregate Fair Value			0
Additional Collateral Aggregate Fair Value	9,400,000		17,400,000
MinimumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	1.4		1.4
FairValueInputsEnergyPrices	44		43
FairValueInputsRenewableEnergyCreditPrices	25		25
FairValueInputsForwardReserve	3		0.35
FairValueInputsExitPricePremium	0.11
MaximumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	10.53		10.53
FairValueInputsEnergyPrices	90		90
FairValueInputsRenewableEnergyCreditPrices	85		85
FairValueInputsForwardReserve	3		0.9
FairValueInputsExitPricePremium	0.32
The Connecticut Light And Power Company [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	(95,573,000)		(96,931,000)
Derivative Liabilities, Noncurrent	(826,023,000)		(865,571,000)
Derivative Assets Noncurrent	94,970,000		90,612,000
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total Abstract
Description of Derivative Activity Volume	Commodity Supply and Price Risk Management: As required by regulation, CL&P has capacity-related contracts with generation facilities. These contracts and similar UI contracts have an expected capacity of 787 MW. CL&P has a sharing agreement with UI, with 80 percent of each contract allocated to CL&P and 20 percent allocated to UI. The capacity contracts extend through 2026 and obligate the utilities to make or receive payments on a monthly basis to or from the generation facilities based on the difference between a set capacity price and the forward capacity market price received in the ISO-NE capacity markets. In addition, CL&P has a contract to purchase 0.1 million MWh of energy per year through 2020.
The Connecticut Light And Power Company [Member] | MinimumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	1.4		1.4
FairValueInputsEnergyPrices	50		50
FairValueInputsForwardReserve	3		0.35
The Connecticut Light And Power Company [Member] | MaximumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	9.83		9.83
FairValueInputsEnergyPrices	54		55
FairValueInputsForwardReserve	3		0.9
NSTAR Electric Company [Member]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total Abstract
Description of Derivative Activity Volume	NSTAR Electric has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2018. NSTAR Electric also has a capacity related contract for up to 35 MW per year that extends through 2019.
NSTAR Electric Company [Member] | MinimumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	1.4		1.4
FairValueInputsRenewableEnergyCreditPrices	25		25
NSTAR Electric Company [Member] | MaximumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	3.39		3.39
FairValueInputsRenewableEnergyCreditPrices	71		71
Western Massachusetts Electric Company [Member]
Other Derivatives Not Designated As Hedging Instruments At Fair Value Net Total Abstract
Description of Derivative Activity Volume	WMECO has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2028 with a facility that is expected to achieve commercial operation by November 2013.
Western Massachusetts Electric Company [Member] | MinimumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	1.4		1.4
FairValueInputsEnergyPrices	44		43
FairValueInputsRenewableEnergyCreditPrices	25		25
Western Massachusetts Electric Company [Member] | MaximumMember
FairValueInputsQuantitativeInformation[Abstract]
FairValueInputsCapacityPrices	10.53		10.53
FairValueInputsEnergyPrices	90		90
FairValueInputsRenewableEnergyCreditPrices	85		85
Fair Value Inputs Level 2 [Member] | Subsidiaries [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	1,600,000		200,000
Derivative Liabilities - Current	(12,000,000)		(19,300,000)
Derivative Liabilities, Noncurrent			(200,000)
Fair Value Inputs Level 3 [Member] | The Connecticut Light And Power Company [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	7,000,000		5,700,000
Derivative Liabilities - Current	(95,600,000)		(96,900,000)
Derivative Liabilities, Noncurrent	(826,000,000)		(865,600,000)
Derivative Assets Noncurrent	95,000,000		90,600,000
Fair Value Inputs Level 3 [Member] | NSTAR Electric Company [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	(1,300,000)		(1,000,000)
Derivative Liabilities, Noncurrent	(12,300,000)		(13,900,000)
Fair Value Inputs Level 3 [Member] | Western Massachusetts Electric Company [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	(100,000)
Derivative Liabilities, Noncurrent	(1,700,000)		(3,000,000)
Fair Value Inputs Level 3 [Member] | Subsidiaries [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	1,900,000		5,500,000
Netting And Collateral [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	(10,500,000)		(12,000,000)
Derivative Liabilities - Current			600,000
Derivative Assets Noncurrent	(57,300,000)		(69,100,000)
Netting And Collateral [Member] | Fair Value Inputs Level 2 [Member] | Subsidiaries [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current			600,000
Netting And Collateral [Member] | Fair Value Inputs Level 3 [Member] | The Connecticut Light And Power Company [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	(10,500,000)		(12,000,000)
Derivative Assets Noncurrent	(57,300,000)		(69,100,000)
Commodity [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	21,000,000		23,400,000
Derivative Liabilities - Current	(109,000,000)		(117,800,000)
Derivative Liabilities, Noncurrent	(840,000,000)		(882,700,000)
Derivative Assets Noncurrent	152,300,000		159,700,000
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net Abstract
Derivative Instruments Gain Loss Recognized In Income Net	300,000	(800,000)
Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability	28,000,000	6,000,000
Commodity [Member] | Fair Value Inputs Level 2 [Member] | Subsidiaries [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	1,600,000		200,000
Derivative Liabilities - Current	(12,000,000)		(19,900,000)
Derivative Liabilities, Noncurrent			(200,000)
Commodity [Member] | Fair Value Inputs Level 3 [Member] | The Connecticut Light And Power Company [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	17,500,000		17,700,000
Derivative Liabilities - Current	(95,600,000)		(96,900,000)
Derivative Liabilities, Noncurrent	(826,000,000)		(865,600,000)
Derivative Assets Noncurrent	152,300,000		159,700,000
Commodity [Member] | Fair Value Inputs Level 3 [Member] | NSTAR Electric Company [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	(1,300,000)		(1,000,000)
Derivative Liabilities, Noncurrent	(12,300,000)		(13,900,000)
Commodity [Member] | Fair Value Inputs Level 3 [Member] | Western Massachusetts Electric Company [Member]
Derivative Instrument Detail Abstract
Derivative Liabilities - Current	(100,000)
Derivative Liabilities, Noncurrent	(1,700,000)		(3,000,000)
Commodity [Member] | Fair Value Inputs Level 3 [Member] | Subsidiaries [Member]
Derivative Instrument Detail Abstract
Derivative Assets - Current	$ 1,900,000		$ 5,500,000

XML

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Fair Value By Balance Sheet Grouping Text Block

		As of March 31, 2013				As of December 31, 2012
		NU				NU
		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	155.6	$	154.2	$	155.6	$	152.2
Long-Term Debt			7,958.9		8,634.1		7,963.5		8,640.7
Rate Reduction Bonds			19.6		19.7		82.1		83.0

		As of March 31, 2013
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	111.6	$	43.0	$	42.6	$	-	$	-	$	-	$	-
Long-Term Debt			2,865.6		3,295.9		1,602.6		1,809.0		998.0		1,091.6		605.1		665.0
Rate Reduction Bonds			-		-		-		-		15.0		15.0		4.6		4.7
		As of December 31, 2012
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	110.0	$	43.0	$	42.2	$	-	$	-	$	-	$	-
Long-Term Debt			2,862.8		3,295.4		1,602.6		1,818.8		997.9		1,088.0		605.3		660.4
Rate Reduction Bonds			-		-		43.5		43.9		29.3		29.6		9.4		9.5

XML

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
AOCI Cash Flow Hedging Component [Abstract]
Beginning Balance - Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax	$ (16,400,000)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	500,000
Ending Balance - Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax	(15,900,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	516,000	423,000
AOCI Unrealized GainLoss component [Abstract]
AOCI Unrealized Gains/Losses on Other Securities	1,300,000
OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	(100,000)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(181,000)	34,000
AOCI Unrealized Gains/Losses on Other Securities-Ending Balance	1,200,000
AOCI Defined Benefit Component [Abstract]
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(57,800,000)
OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	1,600,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1,621,000	1,407,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(56,200,000)
AOCI Rollforward [Abstract]
AOCI Beginning Balance	(72,854,000)
AmountReclassifiedFromAOCI	2,100,000
OtherComprehensiveIncomeBeforeReclassifications	(100,000)
Other Comprehensive Income (Loss), Net of Tax, Total	1,956,000	1,864,000
AOCI ending Balance	(70,898,000)
Reclassication of Items out of AOCI [Abstract]
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeBeforeTax	(800,000)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	(500,000)
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax	(300,000)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax	(2,600,000)
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	(2,600,000)
OtherComprehensiveIncomeReclassificationOfDefinedBenefitPlansNetGainLossRecognizedInNetPeriodicBenefitCostNetOfTax	(1,600,000)
AmountReclassifiedFromAOCI	(2,100,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	1,000,000
The Connecticut Light And Power Company [Member]
AOCI Cash Flow Hedging Component [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	111,000	111,000
AOCI Unrealized GainLoss component [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(6,000)	1,000
AOCI Rollforward [Abstract]
AOCI Beginning Balance	(1,800,000)
Other Comprehensive Income (Loss), Net of Tax, Total	105,000	112,000
AOCI ending Balance	(1,695,000)
Public Service Company Of New Hampshire [Member]
AOCI Cash Flow Hedging Component [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	291,000	290,000
AOCI Unrealized GainLoss component [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(11,000)	2,000
AOCI Defined Benefit Component [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3,000)
AOCI Rollforward [Abstract]
AOCI Beginning Balance	(9,655,000)
Other Comprehensive Income (Loss), Net of Tax, Total	277,000	292,000
AOCI ending Balance	(9,378,000)
Western Massachusetts Electric Company [Member]
AOCI Cash Flow Hedging Component [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	85,000	85,000
AOCI Unrealized GainLoss component [Abstract]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,000)	0
AOCI Rollforward [Abstract]
AOCI Beginning Balance	(3,846,000)
Other Comprehensive Income (Loss), Net of Tax, Total	83,000	85,000
AOCI ending Balance	$ (3,763,000)

XML

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

H.	Supplemental Cash Flow Information
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)		As of March 31, 2013		As of March 31, 2012
NU		$	98.7	$	138.5
CL&P			28.2		36.6
NSTAR Electric (1)			30.7		29.5
PSNH			12.9		32.5
WMECO			15.8		56.6
(1) NSTAR Electric amounts are not included in NU consolidated as of March 31, 2012.

XML

LONG-TERM DEBT (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-Term Debt	$ 7,011,561	$ 7,200,156
The Connecticut Light And Power Company [Member]
Debt Instrument [Line Items]
Long-Term Debt	2,740,614	2,737,790
NSTAR Electric Company [Member]
Debt Instrument [Line Items]
Long-Term Debt	1,600,950	1,600,911
Public Service Company Of New Hampshire [Member]
Debt Instrument [Line Items]
Long-Term Debt	888,999	997,932
Western Massachusetts Electric Company [Member]
Debt Instrument [Line Items]
Long-Term Debt	$ 550,057	$ 550,270

XML

Other Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Excise And Sales Taxes	$ 38.4	$ 35.0
The Connecticut Light And Power Company [Member]
Excise And Sales Taxes	$ 32.0	$ 29.4

XML

EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Earnings Per Share Basic And Diluted [Table Text Block]

		For the Three Months Ended March 31,
(Millions of Dollars, except share information)		2013		2012
Net Income Attributable to Controlling Interest		$	228.1	$	99.3
Weighted Average Common Shares Outstanding:
	Basic		315,129,782		178,055,716
	Dilutive Effect		872,756		381,737
	Diluted		316,002,538		178,437,453
Basic and Diluted EPS		$	0.72	$	0.56

XML

INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total Deferred Income Taxes	$ 168,938	$ 52,474
Income Tax Expense	120,487	55,964
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	350,455	156,719
Income Tax Expense	120,487	55,964
Income Tax Uncertainties [Abstract]
Income Tax Examination Description	Tax Positions: In March 2013, NU received a Final Determination from the Connecticut Department of Revenue Services (DRS) Appellate Division that concluded its audit of NU's Connecticut income tax returns for the years 2005 through 2008, bringing closure to, and effective settlement of, issues concerning the deductibility of expenses and credits through 2008. The DRS Determination resulted in total NU and CL&P after-tax benefits of $13.6 million and $6.9 million, respectively, recorded in the first quarter of 2013 that included a reduction in NU and CL&P pre-tax interest expense of $8.7 million and $4 million, or $5.2 million and $2.4 million after-tax, respectively. Further, the income tax expense impact resulted in a tax benefit to NU and CL&P of $8.4 million and $4.5 million after-tax, respectively. Management estimates that resolution of this audit decreases NU's and CL&P's unrecognized tax benefits by approximately $49.8 million and $39.4 million, respectively, that was largely offset by NU's and CL&P's valuation allowance and other tax impacts of $44.9 million and $36.5 million, respectively.
Tax Years [Abstract]
Significant Change In Unrecognized Tax Benefits, Nature of Event	NU currently has open tax years. It is reasonably possible that at least one of these open tax years could be resolved within the next twelve months. Management estimates that the potential resolutions could result in a $1 million to $2 million decrease, net of any related valuation allowance, in unrecognized tax benefits for NU.
The Connecticut Light And Power Company [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total Deferred Income Taxes	65,475	32,460
Income Tax Expense	39,188	29,672
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	124,196	83,657
Income Tax Expense	39,188	29,672
NSTAR Electric Company [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total Deferred Income Taxes	26,571	(19,446)
Income Tax Expense	31,265	2,035
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	79,387	5,975
Income Tax Expense	31,265	2,035
Public Service Company Of New Hampshire [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total Deferred Income Taxes	10,143	8,908
Income Tax Expense	17,984	13,353
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	46,980	34,615
Income Tax Expense	17,984	13,353
Western Massachusetts Electric Company [Member]
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total Deferred Income Taxes	16,828	9,198
Income Tax Expense	11,698	9,171
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Before Income Tax Expense	30,301	23,357
Income Tax Expense	$ 11,698	$ 9,171

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SEGMENT INFORMATION (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating Revenues	$ 1,995,023,000	$ 1,099,623,000
Depreciation And Amortization	(243,500,000)	(104,600,000)
Operating Expenses, Other	(1,332,500,000)	(780,600,000)
Operating Income	418,945,000	214,393,000
Total Interest Expense	(76,255,000)	(66,447,000)
Income Tax Expense	(120,487,000)	(55,964,000)
Net Income	229,968,000	100,755,000
Net Income Attributable to Noncontrolling Interests	(1,879,000)	(1,493,000)
Net Income Attributable to Controlling Interests	228,089,000	99,262,000
Total Assets	28,328,661,000		28,302,824,000
Investments in Property, Plant and Equipment	388,950,000	304,294,000
Electric Distribution Member
Segment Reporting Information [Line Items]
Operating Revenues	1,374,200,000	786,000,000
Depreciation And Amortization	(177,000,000)	(72,200,000)
Operating Expenses, Other	(1,004,900,000)	(622,100,000)
Operating Income	192,300,000	91,700,000
Total Interest Expense	(42,100,000)	(33,000,000)
Interest Income	1,000,000	1,100,000
Other Income/(Loss)	3,800,000	4,400,000
Income Tax Expense	(54,300,000)	(21,400,000)
Net Income	100,700,000	42,800,000
Net Income Attributable to Noncontrolling Interests	(1,200,000)	(800,000)
Net Income Attributable to Controlling Interests	99,500,000	42,000,000
Total Assets	18,208,200,000	9,553,300,000
Investments in Property, Plant and Equipment	157,800,000	130,700,000
Natural Gas Distribution [Member]
Segment Reporting Information [Line Items]
Operating Revenues	361,800,000	139,000,000
Depreciation And Amortization	(17,400,000)	(7,700,000)
Operating Expenses, Other	(267,200,000)	(102,200,000)
Operating Income	77,200,000	29,100,000
Total Interest Expense	(7,400,000)	(5,400,000)
Interest Income	0	0
Other Income/(Loss)	200,000	0
Income Tax Expense	(26,700,000)	(9,000,000)
Net Income	43,300,000	14,700,000
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Controlling Interests	43,300,000	14,700,000
Total Assets	2,735,400,000	1,498,200,000
Investments in Property, Plant and Equipment	31,200,000	20,500,000
Transmission [Member]
Segment Reporting Information [Line Items]
Operating Revenues	239,500,000	162,800,000
Depreciation And Amortization	(31,800,000)	(21,100,000)
Operating Expenses, Other	(62,200,000)	(47,600,000)
Operating Income	145,500,000	94,100,000
Total Interest Expense	(21,900,000)	(19,700,000)
Interest Income	100,000	100,000
Other Income/(Loss)	2,700,000	3,300,000
Income Tax Expense	(45,800,000)	(30,800,000)
Net Income	80,600,000	47,000,000
Net Income Attributable to Noncontrolling Interests	(700,000)	(700,000)
Net Income Attributable to Controlling Interests	79,900,000	46,300,000
Total Assets	6,269,100,000	3,900,700,000
Investments in Property, Plant and Equipment	185,400,000	135,900,000
Other Segment [Member]
Segment Reporting Information [Line Items]
Operating Revenues	217,200,000	133,300,000
Depreciation And Amortization	(19,000,000)	(3,900,000)
Operating Expenses, Other	(197,400,000)	(134,900,000)
Operating Income	800,000	(5,500,000)
Total Interest Expense	(6,400,000)	(9,400,000)
Interest Income	1,600,000	1,300,000
Other Income/(Loss)	320,300,000	122,600,000
Income Tax Expense	6,500,000	6,000,000
Net Income	322,800,000	115,000,000
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Controlling Interests	322,800,000	115,000,000
Total Assets	18,749,800,000	7,261,700,000
Investments in Property, Plant and Equipment	14,600,000	17,200,000
Eliminations Segment [Member]
Segment Reporting Information [Line Items]
Operating Revenues	(197,700,000)	(121,500,000)
Depreciation And Amortization	1,700,000	300,000
Operating Expenses, Other	199,200,000	126,200,000
Operating Income	3,200,000	5,000,000
Total Interest Expense	1,500,000	1,100,000
Interest Income	(1,600,000)	(1,300,000)
Other Income/(Loss)	(320,300,000)	(122,700,000)
Income Tax Expense	(200,000)	(800,000)
Net Income	(317,400,000)	(118,700,000)
Net Income Attributable to Noncontrolling Interests	0	0
Net Income Attributable to Controlling Interests	(317,400,000)	(118,700,000)
Total Assets	(17,633,800,000)	(6,235,500,000)
Investments in Property, Plant and Equipment	0	0
Total [Member]
Segment Reporting Information [Line Items]
Operating Revenues	1,995,000,000	1,099,600,000
Operating Income	419,000,000	214,400,000
Total Interest Expense	(76,300,000)	(66,400,000)
Interest Income	1,100,000	1,200,000
Other Income/(Loss)	6,700,000	7,600,000
Income Tax Expense	(120,500,000)	(56,000,000)
Net Income	230,000,000	100,800,000
Net Income Attributable to Noncontrolling Interests	(1,900,000)	(1,500,000)
Net Income Attributable to Controlling Interests	228,100,000	99,300,000
Total Assets	28,328,700,000	15,978,400,000
Investments in Property, Plant and Equipment	$ 389,000,000	$ 304,300,000

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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (878.6)	$ (962.2)
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3		32.2
Net Realized/Unrealized Gains Losses included in Net Income	5.7	8.0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability	26.2	6.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	13.6	14.5
Ending Balance	(833.1)	(901.5)
The Connecticut Light And Power Company [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(866.2)	(931.6)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability	24.3	10.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	22.3	21.1
Ending Balance	(819.6)	(899.6)
NSTAR Electric Company [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(14.9)	(3.4)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability	0.7	(3.4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0.6	1.4
Ending Balance	(13.6)	(5.4)
Western Massachusetts Electric Company [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	(3.0)	(7.3)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Gain Loss Included In Reg Asset Liability	1.2	(5.0)
Ending Balance	$ (1.8)	$ (12.3)

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DERIVATIVE INSTRUMENTS

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Derivative Instruments and Hedging Activities Disclosure [Text Block]

4.       DERIVATIVE INSTRUMENTS

The Regulated companies purchase and procure energy and energy-related products for their customers, which are subject to price volatility. The costs associated with supplying energy to customers are recoverable through customer rates. The Regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative contracts, many of which meet the definition of and are designated as "normal purchases or normal sales" (normal) under the applicable accounting guidance, and the use of nonderivative contracts.

Derivative contracts that are not recorded as normal are recorded at fair value as current or long-term derivative assets or liabilities. For the Regulated companies, regulatory assets or liabilities are recorded for the changes in fair values of derivatives, as costs are, and management believes they will continue to be, recovered from or refunded in customer rates. For NU's remaining unregulated wholesale marketing contracts, changes in fair values of derivatives are included in Net Income. The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses or Operating Revenues on the consolidated statements of income, as applicable, as electricity or natural gas is delivered.

CL&P, NSTAR Electric and WMECO mitigate the risks associated with the price volatility of energy and energy-related products through the use of SS, LRS, and basic service contracts, which fix the price of electricity purchased for customers and are accounted for as normal. CL&P, NSTAR Electric and WMECO haveentered into derivative and nonderivative contracts for the purchase of energy and energy-related products and contracts that are derivatives. NU also has NYMEX future contracts in order to reduce variability associated with the purchase price of approximately 5.2millionMMBtu of natural gas.

The costs or benefits from all of the Regulated companies' derivative contracts are recoverable from or refundable to customers, and therefore, changes in fair value are recorded as Regulatory Assets or Regulatory Liabilities on the consolidated balance sheets.

The gross fair values of derivative assets and liabilities with the same counterparty are offset and reported as net Derivative Assets or Derivative Liabilities, with current and long-term portions, in theconsolidated balance sheets. Cash collateral posted or collected under master netting agreements is recorded as an offset to the derivative asset or liability. The following tables present the gross fair values of contracts categorized by risk type and the net amounts recorded as current or long-term derivative asset or liability:

		As of March 31, 2013
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other (1)	$	1.6	$	-	$	1.6
Level 3:
	CL&P (1)		17.5		(10.5)		7.0
	Other		1.9		-		1.9
Total Current Derivative Assets		$	21.0	$	(10.5)	$	10.5
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	152.3	$	(57.3)	$	95.0
Total Long-Term Derivative Assets		$	152.3	$	(57.3)	$	95.0
Current Derivative Liabilities:
Level 2:
	Other (1) (3)	$	(12.0)	$	-	$	(12.0)
Level 3:
	CL&P		(95.6)		-		(95.6)
	NSTAR Electric		(1.3)		-		(1.3)
	WMECO		(0.1)		-		(0.1)
Total Current Derivative Liabilities		$	(109.0)	$	-	$	(109.0)
Long-Term Derivative Liabilities:
Level 3:
	CL&P	$	(826.0)	$	-	$	(826.0)
	NSTAR Electric		(12.3)		-		(12.3)
	WMECO		(1.7)		-		(1.7)
Total Long-Term Derivative Liabilities (4)		$	(840.0)	$	-	$	(840.0)

		As of December 31, 2012
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other (1)	$	0.2	$	-	$	0.2
Level 3:
	CL&P (1)		17.7		(12.0)		5.7
	Other		5.5		-		5.5
Total Current Derivative Assets		$	23.4	$	(12.0)	$	11.4
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	159.7	$	(69.1)	$	90.6
Total Long-Term Derivative Assets		$	159.7	$	(69.1)	$	90.6
Current Derivative Liabilities:
Level 2:
	Other (1), (3)	$	(19.9)	$	0.6	$	(19.3)
Level 3:
	CL&P		(96.9)		-		(96.9)
	NSTAR Electric		(1.0)		-		(1.0)
Total Current Derivative Liabilities		$	(117.8)	$	0.6	$	(117.2)
Long-Term Derivative Liabilities:
Level 2:
	Other (1)	$	(0.2)	$	-	$	(0.2)
Level 3:
	CL&P		(865.6)		-		(865.6)
	NSTAR Electric		(13.9)		-		(13.9)
	WMECO		(3.0)		-		(3.0)
Total Long-Term Derivative Liabilities		$	(882.7)	$	-	$	(882.7)

Amounts represent derivative assets and liabilities which NU has elected to record net on the consolidated balance sheets. These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.

(2)       Current derivative assets are included in Prepayments and Other Current Assets on the consolidated balance sheets. NSTAR Electric and WMECO derivative liabilities are included in Other Current Liabilities and Other Long-Term Liabilities on the consolidated balance sheets.

(3)As of March 31, 2013 and December 31, 2012, NU had $3.5 million and $4.1 million, respectively, of cash posted related to these contracts, whichis not offset against the derivative liability and is recorded as Prepayments and Other Current Assets on the consolidated balance sheets.

For further information on the fair value of derivative contracts, see Note 1E, "Summary of Significant Accounting Policies -Fair Value Measurements," to the consolidated financial statements.

Derivatives Not Designated as Hedges

Commodity Supply and Price Risk Management: As required by regulation, CL&P has capacity-related contracts with generation facilities. These contracts and similar UI contracts have an expected capacity of 787 MW. CL&P has a sharing agreement with UI, with 80 percent of each contract allocated to CL&P and 20 percent allocated to UI. The capacity contracts extend through 2026 and obligate the utilities to make or receive payments on a monthly basis to or from the generation facilities based on the difference between a set capacity price and the forward capacity market price received in the ISO-NE capacity markets. In addition, CL&P has a contract to purchase 0.1 million MWh of energy per year through 2020.

NSTAR Electric has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2018. NSTAR Electric also has a capacity related contract for up to 35 MW per year that extends through 2019.

WMECO has a renewable energy contract to purchase 0.1 million MWh of energy per year through 2028 with a facility that is expected to achieve commercial operation by November 2013.

As of March 31, 2013 and December 31, 2012, NU had approximately 5thousand MWh and 24 thousand MWh, respectively, of supply volumes remaining in its unregulated wholesale portfolio when expected sales are compared with supply contracts.

The following table presents the realized and unrealized gains/(losses) associated with NU's derivative contracts not designated as hedges (See Level 3 tables in the "Valuations using significant unobservable inputs" section for CL&P, NSTAR Electric and WMECO gains and losses on derivative contracts):

Location of Amounts		Amounts Recognized on Derivatives
Recognized on Derivatives		For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012
NU
Balance Sheet:
	Regulatory Assets	$	28.0	$	6.0
Statement of Income:
	Purchased Power, Fuel and Transmission		0.3		(0.8)

Hedging

Fair Value Hedge: NU parent had a fixed to floating interest rate swap on its $263 million, fixed rate senior note that matured on April 1, 2012. This interest rate swap qualified and was designated as a fair value hedge. Prior to the settlement of the swap on April 2, 2012, $2.5 million of interest benefit was recorded in Net Income in the first quarter of 2012.

Cash Flow Hedges:For information on the treatment of previously settled cash flow hedges, see Note 11, “Accumulated Other Comprehensive Income/(Loss),” to the consolidated financial statements.

Credit Risk

Certain of NU's derivative contracts contain credit risk contingent features. These features require NU to maintain investment grade credit ratings from the major rating agencies and to post collateral for contracts in a net liability position over specified credit limits. The following summarizes the fair value of derivative contracts that were in a net liability position and subject to credit risk contingent features, the fair value of cash collateral, and the additional collateral that would be required to be posted by NU if the unsecured debt credit ratings of NU parent were downgraded to below investment grade as of March 31, 2013 and December 31, 2012:

As of March 31, 2013

As of December 31, 2012

Additional Collateral

Additional Collateral

Fair Value Subject

Required if

Fair Value Subject

Required if

to Credit Risk

Cash

Downgraded Below

to Credit Risk

Cash

Downgraded Below

(Millions of Dollars)

Contingent Features

Collateral Posted

Investment Grade

Contingent Features

Collateral Posted

Investment Grade

NU

$

(8.4)

$

-

$

9.4

$

(15.3)

$

-

$

17.4

Fair Value Measurements of Derivative Instruments

Valuation of Derivative Instruments:Derivative contracts classified as Level 2 in the fair value hierarchy relate to the financial contracts for natural gas futures and the remaining unregulated wholesale marketing sourcing contracts to purchase energy for periods in which prices are quoted in an active market. Prices are obtained from broker quotes and are based on actual market activity. The contracts are valued using the mid-point of the bid-ask spread. Valuations of these contracts also incorporate discount rates using the yield curve approach.

The fair value of derivative contracts classified as Level 3 utilizes significant unobservable inputs. The fair value is modeled using income techniques, such as discounted cash flow approaches adjusted for assumptions relating to exit price. Significant observable inputs for valuations of these contracts include energy and energy-related product prices in future years for which quoted prices in an active market exist. Fair value measurements categorized in Level 3 of the fair value hierarchy are prepared by individuals with expertise in valuation techniques, pricing of energy and energy-related products, and accounting requirements. The future power and capacity prices for periods that are not quoted in an active market or established at auction are based on available market data and are escalated based on estimates of inflation to address the full time period of the contract.

Valuations of derivative contracts using discounted cash flow methodology include assumptions regarding the timing and likelihood of scheduled payments and also reflect non-performance risk, including credit, using the default probability approach based on the counterparty's credit rating for assets and the company's credit rating for liabilities. Valuations incorporate estimates of premiums or discounts that would be required by a market participant to arrive at an exit price, using historical market transactions adjusted for the terms of the contract.

The following is a summary of NU's, including CL&P's, NSTAR Electric's and WMECO's, Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:

	Range	Period Covered	Range	Period Covered
Energy Prices:
NU	$44 - $90 per MWh	2018 - 2028	$43 - $90 per MWh	2018 - 2028
CL&P	$50 - $54 per MWh	2018 - 2020	$50 - $55 per MWh	2018 - 2020
WMECO	$44 - $90 per MWh	2018 - 2028	$43 - $90 per MWh	2018 - 2028
Capacity Prices:
NU	$1.40 - $10.53 per kW-Month	2016 - 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
CL&P	$1.40 - $9.83 per kW-Month	2016 - 2026	$1.40 - $9.83 per kW-Month	2016 - 2026
NSTAR Electric	$1.40 - $3.39 per kW-Month	2016 - 2019	$1.40 - $3.39 per kW-Month	2016 - 2019
WMECO	$1.40 - $10.53 per kW-Month	2016 - 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
Forward Reserve:
NU, CL&P	$3.00 per kW-Month	2013 - 2024	$0.35 - $0.90 per kW-Month	2013 - 2024
REC Prices:
NU	$25 - $85 per REC	2013 - 2028	$25 - $85 per REC	2013 - 2028
NSTAR Electric	$25 - $71 per REC	2013 - 2018	$25 - $71 per REC	2013 - 2018
WMECO	$25 - $85 per REC	2013 - 2028	$25 - $85 per REC	2013 - 2028

Exit price premiums of 11 percent through 32 percent are also applied on these contracts and reflect the most recent market activity available for similar type contracts.

Significant increases or decreases in future power or capacity prices in isolation would decrease or increase, respectively, the fair value of the derivative liability. Any increases in the risk premiums would increase the fair value of the derivative liabilities. Changes in these fair values are recorded as a regulatory asset or liability and would not impact net income.

Valuations using significant unobservable inputs: The following tables present changes for the three months ended March 31, 2013 and 2012 in the Level 3 category of derivative assets and derivative liabilities measured at fair value on a recurring basis. The derivative assets and liabilities are presented on a net basis. The fair value as of January 1, 2012 reflects a reclassification of remaining unregulated wholesale marketing sourcing contracts that had previously been presented as a portfolio along with the unregulated wholesale marketing sales contract as Level 3 under the highest and best use valuation premise. These contracts are now classified within Level 2 of the fair value hierarchy.

		For the Three Months Ended
		March 31, 2013		March 31, 2012
(Millions of Dollars)		NU		NU
Derivatives, Net:
Fair Value as of Beginning of Period		$	(878.6)	$	(962.2)
Transfer to Level 2			-		32.2
Net Realized/Unrealized Gains Included in:
	Net Income (2)		5.7		8.0
	Regulatory Assets		26.2		6.0
Settlements			13.6		14.5
Fair Value as of End of Period		$	(833.1)	$	(901.5)

		For the Three Months Ended
		March 31, 2013						March 31, 2012
(Millions of Dollars)		CL&P		NSTAR Electric		WMECO		CL&P		NSTAR Electric(1)		WMECO
Derivatives, Net:
Fair Value as of Beginning of Period		$	(866.2)	$	(14.9)	$	(3.0)	$	(931.6)	$	(3.4)	$	(7.3)
Net Realized/Unrealized Gains/(Losses)
	Included in Regulatory Assets		24.3		0.7		1.2		10.9		(3.4)		(5.0)
Settlements			22.3		0.6		-		21.1		1.4		-
Fair Value as of End of Period		$	(819.6)	$	(13.6)	$	(1.8)	$	(899.6)	$	(5.4)	$	(12.3)

(1)NSTAR Electric amounts are not included in NU consolidated for the three months ended March 31, 2012.

(2)The Net Income impact for the three months ended March 31, 2013 and 2012 relates to the unregulated wholesale marketing sales contract and is offset by the gains/(losses) on the unregulated sourcing contracts classified as Level 2 in the fair value hierarchy, resulting in total net gains of $0.3 million and net losses of $0.8 million, respectively

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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Capital Expenditures Incurred But Not Yet Paid	$ 98.7	$ 138.5
The Connecticut Light And Power Company [Member]
Capital Expenditures Incurred But Not Yet Paid	28.2	36.6
NSTAR Electric Company [Member]
Capital Expenditures Incurred But Not Yet Paid	30.7	29.5
Public Service Company Of New Hampshire [Member]
Capital Expenditures Incurred But Not Yet Paid	12.9	32.5
Western Massachusetts Electric Company [Member]
Capital Expenditures Incurred But Not Yet Paid	$ 15.8	$ 56.6

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MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of March 31, 2013
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	355.3	$	10.0	$	(0.1)	$	365.2
	Equity Securities (2)		144.0		30.7		-		174.7
WMECO
	Debt Securities		57.7		0.1		-		57.8
		As of December 31, 2012
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	266.6	$	13.3	$	(0.1)	$	279.8
	Equity Securities (2)		145.5		20.0		-		165.5
WMECO
	Debt Securities		57.7		0.1		(0.1)		57.7

Investments Classified by Contractual Maturity Date [Table Text Block]

	NU				WMECO
	Amortized				Amortized
(Millions of Dollars)	Cost		Fair Value		Cost		Fair Value
Less than one year (1)	$	150.7	$	150.8	$	30.4	$	30.6
One to five years		62.2		63.5		18.7		18.5
Six to ten years		51.2		53.4		4.1		4.1
Greater than ten years		91.2		97.5		4.5		4.6
Total Debt Securities	$	355.3	$	365.2	$	57.7	$	57.8

Fair Value Heirarchy [Table Text Block]

			NU				WMECO
			As of				As of
(Millions of Dollars)			March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Level 1:
	Mutual Funds and Equities		$	225.9	$	212.5	$	-	$	-
	Money Market Funds			120.1		40.2		3.6		5.2
Total Level 1			$	346.0	$	252.7	$	3.6	$	5.2
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)	$	78.5	$	69.9	$	18.2	$	18.7
	Corporate Debt Securities			41.1		33.0		11.7		7.0
	Asset-Backed Debt Securities			26.4		28.5		9.6		10.9
	Municipal Bonds			82.6		93.8		8.6		11.6
	Other Fixed Income Securities			16.5		14.4		6.1		4.3
Total Level 2			$	245.1	$	239.6	$	54.2	$	52.5
Total Marketable Securities			$	591.1	$	492.3	$	57.8	$	57.7

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DERIVATIVE INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block

		As of March 31, 2013
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other (1)	$	1.6	$	-	$	1.6
Level 3:
	CL&P (1)		17.5		(10.5)		7.0
	Other		1.9		-		1.9
Total Current Derivative Assets		$	21.0	$	(10.5)	$	10.5
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	152.3	$	(57.3)	$	95.0
Total Long-Term Derivative Assets		$	152.3	$	(57.3)	$	95.0
Current Derivative Liabilities:
Level 2:
	Other (1) (3)	$	(12.0)	$	-	$	(12.0)
Level 3:
	CL&P		(95.6)		-		(95.6)
	NSTAR Electric		(1.3)		-		(1.3)
	WMECO		(0.1)		-		(0.1)
Total Current Derivative Liabilities		$	(109.0)	$	-	$	(109.0)
Long-Term Derivative Liabilities:
Level 3:
	CL&P	$	(826.0)	$	-	$	(826.0)
	NSTAR Electric		(12.3)		-		(12.3)
	WMECO		(1.7)		-		(1.7)
Total Long-Term Derivative Liabilities (4)		$	(840.0)	$	-	$	(840.0)

		As of December 31, 2012
		Commodity Supply and				Net Amount Recorded as
(Millions of Dollars)		Price Risk Management		Netting (1)		Derivative Asset/(Liability) (2)
Current Derivative Assets:
Level 2:
	Other (1)	$	0.2	$	-	$	0.2
Level 3:
	CL&P (1)		17.7		(12.0)		5.7
	Other		5.5		-		5.5
Total Current Derivative Assets		$	23.4	$	(12.0)	$	11.4
Long-Term Derivative Assets:
Level 3:
	CL&P (1)	$	159.7	$	(69.1)	$	90.6
Total Long-Term Derivative Assets		$	159.7	$	(69.1)	$	90.6
Current Derivative Liabilities:
Level 2:
	Other (1), (3)	$	(19.9)	$	0.6	$	(19.3)
Level 3:
	CL&P		(96.9)		-		(96.9)
	NSTAR Electric		(1.0)		-		(1.0)
Total Current Derivative Liabilities		$	(117.8)	$	0.6	$	(117.2)
Long-Term Derivative Liabilities:
Level 2:
	Other (1)	$	(0.2)	$	-	$	(0.2)
Level 3:
	CL&P		(865.6)		-		(865.6)
	NSTAR Electric		(13.9)		-		(13.9)
	WMECO		(3.0)		-		(3.0)
Total Long-Term Derivative Liabilities		$	(882.7)	$	-	$	(882.7)

Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block

Location of Amounts		Amounts Recognized on Derivatives
Recognized on Derivatives		For the Three Months Ended March 31,
(Millions of Dollars)		2013		2012
NU
Balance Sheet:
	Regulatory Assets	$	28.0	$	6.0
Statement of Income:
	Purchased Power, Fuel and Transmission		0.3		(0.8)

Schedule Of Credit Risk Contingent Features [Table Text Block]

As of March 31, 2013

As of December 31, 2012

Additional Collateral

Additional Collateral

Fair Value Subject

Required if

Fair Value Subject

Required if

to Credit Risk

Cash

Downgraded Below

to Credit Risk

Cash

Downgraded Below

(Millions of Dollars)

Contingent Features

Collateral Posted

Investment Grade

Contingent Features

Collateral Posted

Investment Grade

NU

$

(8.4)

$

-

$

9.4

$

(15.3)

$

-

$

17.4

Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs [Table Text Block]

		For the Three Months Ended
		March 31, 2013		March 31, 2012
(Millions of Dollars)		NU		NU
Derivatives, Net:
Fair Value as of Beginning of Period		$	(878.6)	$	(962.2)
Transfer to Level 2			-		32.2
Net Realized/Unrealized Gains Included in:
	Net Income (2)		5.7		8.0
	Regulatory Assets		26.2		6.0
Settlements			13.6		14.5
Fair Value as of End of Period		$	(833.1)	$	(901.5)

		For the Three Months Ended
		March 31, 2013						March 31, 2012
(Millions of Dollars)		CL&P		NSTAR Electric		WMECO		CL&P		NSTAR Electric(1)		WMECO
Derivatives, Net:
Fair Value as of Beginning of Period		$	(866.2)	$	(14.9)	$	(3.0)	$	(931.6)	$	(3.4)	$	(7.3)
Net Realized/Unrealized Gains/(Losses)
	Included in Regulatory Assets		24.3		0.7		1.2		10.9		(3.4)		(5.0)
Settlements			22.3		0.6		-		21.1		1.4		-
Fair Value as of End of Period		$	(819.6)	$	(13.6)	$	(1.8)	$	(899.6)	$	(5.4)	$	(12.3)

Fairvalueinputsliabilitiesquantitativeinformationtabletextblock

	Range	Period Covered	Range	Period Covered
Energy Prices:
NU	$44 - $90 per MWh	2018 - 2028	$43 - $90 per MWh	2018 - 2028
CL&P	$50 - $54 per MWh	2018 - 2020	$50 - $55 per MWh	2018 - 2020
WMECO	$44 - $90 per MWh	2018 - 2028	$43 - $90 per MWh	2018 - 2028
Capacity Prices:
NU	$1.40 - $10.53 per kW-Month	2016 - 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
CL&P	$1.40 - $9.83 per kW-Month	2016 - 2026	$1.40 - $9.83 per kW-Month	2016 - 2026
NSTAR Electric	$1.40 - $3.39 per kW-Month	2016 - 2019	$1.40 - $3.39 per kW-Month	2016 - 2019
WMECO	$1.40 - $10.53 per kW-Month	2016 - 2028	$1.40 - $10.53 per kW-Month	2016 - 2028
Forward Reserve:
NU, CL&P	$3.00 per kW-Month	2013 - 2024	$0.35 - $0.90 per kW-Month	2013 - 2024
REC Prices:
NU	$25 - $85 per REC	2013 - 2028	$25 - $85 per REC	2013 - 2028
NSTAR Electric	$25 - $71 per REC	2013 - 2018	$25 - $71 per REC	2013 - 2018
WMECO	$25 - $85 per REC	2013 - 2028	$25 - $85 per REC	2013 - 2028

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	$ 155,568,000	$ 155,568,000
Rate Reduction Bonds	19,610,000	82,139,000
Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	155,600,000	155,600,000
Rate Reduction Bonds	19,600,000	82,100,000
Other Long Term Debt	7,958,900,000	7,963,500,000
Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	154,200,000	152,200,000
Rate Reduction Bonds	19,700,000	83,000,000
Other Long Term Debt	8,634,100,000	8,640,700,000
The Connecticut Light And Power Company [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	116,200,000	116,200,000
The Connecticut Light And Power Company [Member] | Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	116,200,000	116,200,000
Other Long Term Debt	2,865,600,000	2,862,800,000
The Connecticut Light And Power Company [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	111,600,000	110,000,000
Other Long Term Debt	3,295,900,000	3,295,400,000
NSTAR Electric Company [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	43,000,000	43,000,000
Rate Reduction Bonds	0	43,493,000
NSTAR Electric Company [Member] | Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	43,000,000	43,000,000
Rate Reduction Bonds	0	43,500,000
Other Long Term Debt	1,602,600,000	1,602,600,000
NSTAR Electric Company [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	42,600,000	42,200,000
Rate Reduction Bonds	0	43,900,000
Other Long Term Debt	1,809,000,000	1,818,800,000
Public Service Company Of New Hampshire [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	14,974,000	29,294,000
Public Service Company Of New Hampshire [Member] | Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	15,000,000	29,300,000
Other Long Term Debt	998,000,000	997,900,000
Public Service Company Of New Hampshire [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	15,000,000	29,600,000
Other Long Term Debt	1,091,600,000	1,088,000,000
Western Massachusetts Electric Company [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	4,636,000	9,352,000
Western Massachusetts Electric Company [Member] | Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	4,600,000	9,400,000
Other Long Term Debt	605,100,000	605,300,000
Western Massachusetts Electric Company [Member] | Estimate Of Fair Value Fair Value Disclosure [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Rate Reduction Bonds	4,700,000	9,500,000
Other Long Term Debt	$ 665,000,000	$ 660,400,000

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REGULATORY ACCOUNTING (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Regulatory Asset [Line Items]
Regulatory Assets Current	$ 625,542,000	$ 705,025,000
Regulatory Assets Long Term	5,015,108,000	5,132,411,000
Regulatory Assets, Total	5,640,600,000	5,837,400,000
Regulatory Assets And Liabilities Other Disclosures Abstract
Description of Regulatory Costs Not yet Approved	Regulatory Costs Not Yet Approved: The Regulated companies had $78.8 million ($3.7 million for CL&P, $26.3 million for NSTAR Electric, $37.2 million for PSNH, and $6 million for WMECO) and $69.9 million ($3.9 million for CL&P, $25.4 million for NSTAR Electric, $35.7 million for PSNH, and $1.4 million for WMECO) of regulatory costs as of March 31, 2013 and December 31, 2012, respectively, which were included in Other Long-Term Assets on the consolidated balance sheets. These amounts represent incurred costs that have not yet been approved for recovery by the applicable regulatory agency. Management believes it is probable that these costs will ultimately be approved and recovered from customers.
Major Storm Costs Incurred	Storm Restoration Costs: The storm restoration cost deferrals relate to costs incurred at CL&P, NSTAR Electric, PSNH and WMECO that each company expects to collect from customers. A storm must meet certain criteria specific to each state and utility company to be declared a major storm. Once a storm is declared major, all qualifying expenses incurred during storm restoration efforts, if deemed prudent, are deferred and recovered from customers in future periods. In Connecticut, qualifying storm restoration costs must exceed $5 million for a storm to be declared a major storm. In Massachusetts, qualifying storm restoration costs must exceed $1 million for NSTAR Electric and $300,000 for WMECO and an emergency response plan must be initiated for a storm to be declared a major storm. In New Hampshire, (1) at least 10 percent of customers must be without power with at least 200 concurrent locations requiring repairs (trouble spots), or (2) at least 300 concurrent trouble spots must be reported for a storm to be declared a major storm. In addition, PSNH is permitted to defer pre-staging costs for storms that may not ultimately qualify as a major storm. On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric. This blizzard resulted in estimated deferred storm restoration costs of approximately $13 million at CL&P and approximately $80 million at NSTAR Electric. On January 31, 2013, a major storm caused damage to CL&P's electric delivery system, which resulted in estimated deferred storm restoration costs of approximately $19 million. Management believes these storm restoration costs meet the criteria for specific cost recovery in Connecticut and Massachusetts and, as a result, are probable of recovery. Therefore, management does not expect these storms to have a material impact on CL&P's or NSTAR Electric’s results of operations. CL&P and NSTAR Electric will seek recovery of these deferred storm restoration costs through their applicable regulatory recovery process.
Regulatory Liabilities [Line Items]
Regulatory Liability Current	191,707,000	134,115,000
Regulatory Liabilities Long-Term	531,546,000	540,162,000
Regulatory Liabilities, Total	723,200,000	674,300,000
Cost Of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	441,300,000	440,800,000
Regulatory Tracker Deferrals Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	147,000,000	95,100,000
AFUDC Transmission Incentive [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	68,900,000	70,000,000
Overrecovered Spent Nuclear Fuel Costs And Contractual Obligations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	15,400,000	15,400,000
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	50,600,000	53,000,000
The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets Current	172,883,000	185,858,000
Regulatory Assets Long Term	2,141,137,000	2,158,363,000
Regulatory Assets, Total	2,314,000,000	2,344,300,000
Regulatory Liabilities [Line Items]
Regulatory Liability Current	42,324,000	32,119,000
Regulatory Liabilities Long-Term	110,688,000	124,319,000
Regulatory Liabilities, Total	153,000,000	156,400,000
The Connecticut Light And Power Company [Member] | Cost Of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	39,300,000	44,200,000
The Connecticut Light And Power Company [Member] | Regulatory Tracker Deferrals Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	39,100,000	39,100,000
The Connecticut Light And Power Company [Member] | AFUDC Transmission Incentive [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	55,500,000	56,600,000
The Connecticut Light And Power Company [Member] | Overrecovered Spent Nuclear Fuel Costs And Contractual Obligations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	15,400,000	15,400,000
The Connecticut Light And Power Company [Member] | Wholesale Transmission Overcollections [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	2,300,000	0
The Connecticut Light And Power Company [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	1,400,000	1,100,000
NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets Current	309,559,000	347,081,000
Regulatory Assets Long Term	1,489,317,000	1,444,870,000
Regulatory Assets, Total	1,798,900,000	1,792,000,000
Regulatory Liabilities [Line Items]
Regulatory Liability Current	67,277,000	47,539,000
Regulatory Liabilities Long-Term	248,376,000	244,224,000
Regulatory Liabilities, Total	315,700,000	291,700,000
NSTAR Electric Company [Member] | Cost Of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	244,500,000	240,300,000
NSTAR Electric Company [Member] | Regulatory Tracker Deferrals Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	37,300,000	14,400,000
NSTAR Electric Company [Member] | AFUDC Transmission Incentive [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	4,100,000	4,100,000
NSTAR Electric Company [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	29,800,000	32,900,000
Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets Current	62,184,000	62,882,000
Regulatory Assets Long Term	329,314,000	351,059,000
Regulatory Assets, Total	391,500,000	414,000,000
Regulatory Liabilities [Line Items]
Regulatory Liability Current	18,132,000	23,002,000
Regulatory Liabilities Long-Term	52,473,000	52,418,000
Regulatory Liabilities, Total	70,600,000	75,400,000
Public Service Company Of New Hampshire [Member] | Cost Of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	51,300,000	51,200,000
Public Service Company Of New Hampshire [Member] | Regulatory Tracker Deferrals Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	13,800,000	20,400,000
Public Service Company Of New Hampshire [Member] | Wholesale Transmission Overcollections [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	1,100,000	0
Public Service Company Of New Hampshire [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	4,400,000	3,800,000
Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets Current	43,534,000	42,370,000
Regulatory Assets Long Term	207,901,000	221,752,000
Regulatory Assets, Total	251,400,000	264,200,000
Regulatory Liabilities [Line Items]
Regulatory Liability Current	15,638,000	21,037,000
Regulatory Liabilities Long-Term	9,736,000	9,686,000
Regulatory Liabilities, Total	25,300,000	30,700,000
Western Massachusetts Electric Company [Member] | Cost Of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	0	0
Western Massachusetts Electric Company [Member] | Regulatory Tracker Deferrals Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	12,500,000	13,700,000
Western Massachusetts Electric Company [Member] | AFUDC Transmission Incentive [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	9,300,000	9,300,000
Western Massachusetts Electric Company [Member] | Wholesale Transmission Overcollections [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	900,000	5,300,000
Western Massachusetts Electric Company [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities, Total	2,600,000	2,400,000
Benefit Costs [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	2,390,400,000	2,452,100,000
Benefit Costs [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	546,900,000	563,200,000
Benefit Costs [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	769,000,000	781,200,000
Benefit Costs [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	217,200,000	223,700,000
Benefit Costs [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	112,600,000	116,000,000
Regulatory Assets Offsetting Derivative Liabilities [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	835,000,000	885,600,000
Regulatory Assets Offsetting Derivative Liabilities [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	819,600,000	866,200,000
Regulatory Assets Offsetting Derivative Liabilities [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	13,600,000	14,900,000
Regulatory Assets Offsetting Derivative Liabilities [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	0	0
Regulatory Assets Offsetting Derivative Liabilities [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	1,800,000	3,000,000
Goodwill [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	532,500,000	537,600,000
Goodwill [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	457,200,000	461,500,000
Storm Restoration Costs [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	656,100,000	547,700,000
Storm Restoration Costs [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	448,700,000	413,900,000
Storm Restoration Costs [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	132,700,000	55,800,000
Storm Restoration Costs [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	32,300,000	34,500,000
Storm Restoration Costs [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	42,400,000	43,500,000
Deferred Income Tax Charges Member
Regulatory Asset [Line Items]
Regulatory Assets, Total	521,700,000	516,200,000
Deferred Income Tax Charges Member | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	371,700,000	367,500,000
Deferred Income Tax Charges Member | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	46,700,000	47,100,000
Deferred Income Tax Charges Member | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	37,300,000	36,200,000
Deferred Income Tax Charges Member | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	31,100,000	31,000,000
Securitized Assets [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	157,600,000	232,600,000
Securitized Assets [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	0	0
Securitized Assets [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	149,500,000	205,100,000
Securitized Assets [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	5,000,000	19,700,000
Securitized Assets [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	3,100,000	7,800,000
Unrecovered Contractual Obligations [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	124,900,000	217,600,000
Unrecovered Contractual Obligations [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	59,700,000	64,000,000
Unrecovered Contractual Obligations [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	20,900,000	22,800,000
Unrecovered Contractual Obligations [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	0	0
Unrecovered Contractual Obligations [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	13,700,000	14,900,000
Power Contracts Buy Out Agreements [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	87,300,000	92,900,000
Power Contracts Buy Out Agreements [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	80,700,000	85,900,000
Power Contracts Buy Out Agreements [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	6,600,000	7,000,000
Regulatory Tracker Deferrals Regulatory Assets [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	177,200,000	190,100,000
Regulatory Tracker Deferrals Regulatory Assets [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	10,100,000	12,200,000
Regulatory Tracker Deferrals Regulatory Assets [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	84,500,000	71,400,000
Regulatory Tracker Deferrals Regulatory Assets [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	49,700,000	49,300,000
Regulatory Tracker Deferrals Regulatory Assets [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	31,300,000	31,900,000
Asset Retirement Obligation Costs Member
Regulatory Asset [Line Items]
Regulatory Assets, Total	90,200,000	88,800,000
Asset Retirement Obligation Costs Member | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	30,000,000	29,400,000
Asset Retirement Obligation Costs Member | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	29,800,000	29,400,000
Asset Retirement Obligation Costs Member | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	14,300,000	14,200,000
Asset Retirement Obligation Costs Member | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	3,600,000	3,500,000
Other Regulatory Assets [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	67,700,000	76,200,000
Other Regulatory Assets [Member] | The Connecticut Light And Power Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	27,300,000	27,900,000
Other Regulatory Assets [Member] | NSTAR Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	14,300,000	16,900,000
Other Regulatory Assets [Member] | Public Service Company Of New Hampshire [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	29,100,000	29,400,000
Other Regulatory Assets [Member] | Western Massachusetts Electric Company [Member]
Regulatory Asset [Line Items]
Regulatory Assets, Total	$ 11,800,000	$ 12,600,000

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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Net Benefit Costs [Table Text Block]

	Pension and SERP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	26.6	$	15.3
Interest Cost		51.4		38.1
Expected Return on Plan Assets		(70.3)		(42.5)
Actuarial Loss		52.9		30.1
Prior Service Cost		1.1		2.1
Total Net Periodic Benefit Expense	$	61.7	$	43.1
Capitalized Pension Expense	$	16.7	$	10.6
	PBOP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	4.8	$	2.3
Interest Cost		12.8		6.2
Expected Return on Plan Assets		(13.8)		(5.6)
Actuarial Loss		8.2		5.5
Prior Service Credit		(0.6)		(0.1)
Net Transition Obligation Cost		-		2.9
Total Net Periodic Benefit Expense	$	11.4	$	11.2

		Pension and SERP
		For the Three Months Ended March 31, 2013								For the Three Months Ended March 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric(1)		PSNH		WMECO
Service Cost		$	6.1	$	9.3	$	3.3	$	1.2	$	5.4	$	7.8	$	2.9	$	1.1
Interest Cost			12.1		14.2		6.0		2.5		12.8		14.8		6.1		2.6
Expected Return on Plan Assets			(18.5)		(22.0)		(7.7)		(4.3)		(17.5)		(16.5)		(6.7)		(4.1)
Actuarial Loss			14.1		14.5		5.5		3.0		11.9		15.7		3.9		2.5
Prior Service Cost/(Credit)			0.5		-		0.1		0.1		0.9		(0.2)		0.4		0.2
Total Net Periodic Benefit Expense		$	14.3	$	16.0	$	7.2	$	2.5	$	13.5	$	21.6	$	6.6	$	2.3
Related Intercompany
	Allocations	$	10.7	$	(2.0)	$	2.6	$	1.8	$	10.6	$	(3.1)	$	2.5	$	2.0
Capitalized Pension Expense		$	7.0	$	5.3	$	2.2	$	1.3	$	6.6	$	6.3	$	2.0	$	1.2

		PBOP
		For the Three Months Ended March 31, 2013						For the Three Months Ended March 31, 2012
(Millions of Dollars)		CL&P			PSNH		WMECO	CL&P		PSNH		WMECO
Service Cost		$	0.9	$	0.6	$	0.2	$	0.8	$	0.5	$	0.2
Interest Cost			2.0		1.0		0.4		2.4		1.2		0.5
Expected Return on Plan Assets			(2.5)		(1.3)		(0.6)		(2.3)		(1.1)		(0.5)
Actuarial Loss			1.7		0.9		0.3		2.0		1.0		0.3
Net Transition Obligation Cost			-		-		-		1.5		0.6		0.3
Total Net Periodic Benefit Expense		$	2.1	$	1.2	$	0.3	$	4.4	$	2.2	$	0.8
Related Intercompany
	Allocations	$	1.6	$	0.4	$	0.3	$	2.1	$	0.5	$	0.4

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Environmental Matters (Tablels)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Environmental Loss Contingencies By Site Text Block

	As of March 31, 2013				As of December 31, 2012
			Reserve				Reserve
	Number of Sites		(in millions)		Number of Sites		(in millions)
NU		72	$	40.7		77	$	39.4
CL&P		19		3.6		19		3.7
NSTAR Electric		14		1.5		16		1.7
PSNH		16		5.6		16		4.9
WMECO		5		0.5		6		0.6

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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Public Utility Property, Plant, and Equipment [Text Block]

3.PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize the NU, CL&P, NSTAR Electric, PSNH and WMECO investments in utility property, plant and equipment by asset category:

		As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)		NU		NU
Distribution - Electric		$	11,504.0	$	11,438.2
Distribution - Natural Gas			2,290.8		2,274.2
Transmission			5,721.2		5,541.1
Generation			1,146.7		1,146.6
Electric and Natural Gas Utility			20,662.7		20,400.1
Other (1)			503.0		429.3
Property, Plant and Equipment, Gross			21,165.7		20,829.4
Less: Accumulated Depreciation
	Electric and Natural Gas Utility		(5,157.7)		(5,065.1)
	Other		(178.5)		(171.5)
Total Accumulated Depreciation			(5,336.2)		(5,236.6)
Property, Plant and Equipment, Net			15,829.5		15,592.8
Construction Work in Progress			908.0		1,012.2
Total Property, Plant and Equipment, Net		$	16,737.5	$	16,605.0

(1)These assets represent unregulated property and are primarily comprised of building improvements at RRR, software and equipment at NUSCO and telecommunications equipment at NSTAR Communications, Inc.

	As of March 31, 2013								As of December 31, 2012
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Distribution	$	4,724.3	$	4,552.0	$	1,535.7	$	730.0	$	4,691.3	$	4,539.9	$	1,520.1	$	724.2
Transmission		2,874.6		1,542.8		602.3		656.7		2,796.1		1,529.7		599.2		583.7
Generation		-		-		1,125.6		21.1		-		-		1,125.5		21.1
Property, Plant and
Equipment, Gross		7,598.9		6,094.8		3,263.6		1,407.8		7,487.4		6,069.6		3,244.8		1,329.0
Less: Accumulated Depreciation		(1,727.5)		(1,573.2)		(968.4)		(257.5)		(1,698.1)		(1,540.1)		(954.0)		(252.1)
Property, Plant and Equipment, Net		5,871.4		4,521.6		2,295.2		1,150.3		5,789.3		4,529.5		2,290.8		1,076.9
Construction Work in Progress		313.2		266.6		65.6		155.4		363.7		205.8		61.7		213.6
Total Property, Plant and
Equipment, Net	$	6,184.6	$	4,788.2	$	2,360.8	$	1,305.7	$	6,153.0	$	4,735.3	$	2,352.5	$	1,290.5

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Guarantees and Indemnifications (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Guarantee Obligations Text Block

		Maximum
		Exposure
Subsidiary	Description	(in millions)			Expiration Dates
Various	Surety Bonds	$	33.1		2013 - 2015 (1)
Various	NE Hydro Companies' Long-Term Debt	$	5.6		Unspecified
NUSCO and RRR	Lease Payments for Vehicles and Real Estate	$	19.2		2019 and 2024
NU Enterprises	Surety Bonds, Insurance Bonds and Performance Guarantees	$	67.8	(2)	(2)

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Provision for Uncollectible Accounts (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts Notes And Loans Receivable [Line Items]
Allowance For Doubtful Accounts Receivable Current	$ 178.6	$ 165.5
The Connecticut Light And Power Company [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance For Doubtful Accounts Receivable Current	85.0	77.6
NSTAR Electric Company [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance For Doubtful Accounts Receivable Current	44.8	44.1
Public Service Company Of New Hampshire [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance For Doubtful Accounts Receivable Current	7.4	6.8
Western Massachusetts Electric Company [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance For Doubtful Accounts Receivable Current	$ 9.0	$ 8.5

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Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Environmental Site Quantity	72	77
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning Balance	$ 39.4
Ending Balance	40.7	39.4
Accrual For Environmental Loss Contingencies Component Amount	2.0
Site Contingency [Abstract]
Cumulative Payments Environmental Loss Contingencies	17.5
Cumulative Environmental Remediation Expense	19.5
The Connecticut Light And Power Company [Member]
Site Contingency [Line Items]
Environmental Site Quantity	19	19
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning Balance	3.7
Ending Balance	3.6	3.7
NSTAR Electric Company [Member]
Site Contingency [Line Items]
Environmental Site Quantity	14	16
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning Balance	1.7
Ending Balance	1.5	1.7
Public Service Company Of New Hampshire [Member]
Site Contingency [Line Items]
Environmental Site Quantity	16	16
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning Balance	4.9
Ending Balance	5.6	4.9
Western Massachusetts Electric Company [Member]
Site Contingency [Line Items]
Environmental Site Quantity	5	6
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning Balance	0.6
Ending Balance	$ 0.5	$ 0.6

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash	$ 60,817	$ 45,748
Receivables, Net	832,989	792,822
Unbilled Revenues	195,870	216,040
Fuel, Materials and Supplies	239,226	267,713
Regulatory Assets Current	625,542	705,025
Marketable Securities - Current	99,115	91,975
Prepayments and Other Current Assets	104,452	107,972
Total Current Assets	2,158,011	2,227,295
Property, Plant and Equipment, Net	16,737,549	16,605,010
Deferred Debits and Other Assets:
Regulatory Assets Long Term	5,015,108	5,132,411
Goodwill	3,519,401	3,519,401
Marketable Securities	492,003	400,329
Derivative Assets Noncurrent	94,970	90,612
Other Long-Term Assets	311,619	327,766
Total Deferred Debits and Other Assets	9,433,101	9,470,519
Total Assets	28,328,661	28,302,824
Current Liabilities:
Notes Payable to Banks	1,287,000	1,120,196
Long-Term Debt - Current Portion	947,328	763,338
Accounts Payable - Current	633,458	764,350
Regulatory Liability Current	191,707	134,115
Derivative Liabilities - Current	108,964	117,194
Other Liabilities - Current	671,180	744,497
Total Current Liabilities	3,839,637	3,643,690
Rate Reduction Bonds	19,610	82,139
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	3,614,278	3,463,347
Regulatory Liabilities Long-Term	531,546	540,162
Long-Term Derivative Liabilities	840,043	882,654
Accrued Pension, PBOP and SERP	2,097,550	2,130,497
Other Long-Term Liabilities	873,637	967,561
Total Deferred Credits and Other Liabilities	7,957,054	7,984,221
Capitalization:
Long-Term Debt	7,011,561	7,200,156
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	155,568	155,568
Common Shareholders' Equity:
Common Stock	1,664,760	1,662,547
Capital Surplus, Paid In	6,173,801	6,183,267
Retained Earnings	1,914,371	1,802,714
Accumulated Other Comprehensive Loss	(70,898)	(72,854)
Treasury Stock	(336,803)	(338,624)
Common Shareholders' Equity	9,345,231	9,237,050
Total Capitalization	16,512,360	16,592,774
Total Liabilities and Capitalization	28,328,661	28,302,824
The Connecticut Light And Power Company [Member]
Current Assets:
Cash	8,307	1
Receivables, Net	318,111	284,787
Accounts Receivable from Affiliated Companies	2,942	6,641
Unbilled Revenues	80,590	85,353
Regulatory Assets Current	172,883	185,858
Materials and Supplies	63,035	64,603
Prepayments and Other Current Assets	47,906	26,413
Total Current Assets	693,774	653,656
Property, Plant and Equipment, Net	6,184,628	6,152,959
Deferred Debits and Other Assets:
Regulatory Assets Long Term	2,141,137	2,158,363
Derivative Assets Noncurrent	94,970	90,612
Other Long-Term Assets	87,368	86,498
Total Deferred Debits and Other Assets	2,323,475	2,335,473
Total Assets	9,201,877	9,142,088
Current Liabilities:
Notes Payable To Affiliated Companies	210,400	99,296
Long-Term Debt - Current Portion	125,000	125,000
Accounts Payable - Current	196,526	262,857
Accounts Payable to Affiliated Companies	31,968	52,326
Obligations to Third Party Suppliers	67,833	67,344
Accrued Taxes	53,383	60,109
Regulatory Liability Current	42,324	32,119
Derivative Liabilities - Current	95,573	96,931
Other Liabilities - Current	102,094	125,662
Total Current Liabilities	925,101	921,644
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,401,609	1,336,105
Regulatory Liabilities Long-Term	110,688	124,319
Long-Term Derivative Liabilities	826,023	865,571
Accrued Pension, PBOP and SERP	304,549	304,696
Other Long-Term Liabilities	192,624	197,434
Total Deferred Credits and Other Liabilities	2,835,493	2,828,125
Capitalization:
Long-Term Debt	2,740,614	2,737,790
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	116,200	116,200
Common Shareholders' Equity:
Common Stock	60,352	60,352
Capital Surplus, Paid In	1,640,566	1,640,149
Retained Earnings	885,246	839,628
Accumulated Other Comprehensive Loss	(1,695)	(1,800)
Common Shareholders' Equity	2,584,469	2,538,329
Total Capitalization	5,441,283	5,392,319
Total Liabilities and Capitalization	9,201,877	9,142,088
Public Service Company Of New Hampshire [Member]
Current Assets:
Cash	3,376	2,493
Receivables, Net	86,225	87,164
Accounts Receivable from Affiliated Companies	7,568	723
Unbilled Revenues	39,062	39,982
Taxes Receivable	2,020	17,177
Fuel, Materials and Supplies	94,783	95,345
Regulatory Assets Current	62,184	62,882
Prepayments and Other Current Assets	8,127	22,205
Total Current Assets	303,345	327,971
Property, Plant and Equipment, Net	2,360,753	2,352,515
Deferred Debits and Other Assets:
Regulatory Assets Long Term	329,314	351,059
Other Long-Term Assets	82,284	83,052
Total Deferred Debits and Other Assets	411,598	434,111
Total Assets	3,075,696	3,114,597
Current Liabilities:
Notes Payable To Affiliated Companies	53,400	63,300
Long-Term Debt - Current Portion	108,985
Accounts Payable - Current	64,619	62,864
Accounts Payable to Affiliated Companies	12,624	21,337
Accrued Interest	13,840	9,317
Regulatory Liability Current	18,132	23,002
Other Liabilities - Current	43,941	41,633
Renewable Portfolio Standards Compliance Obligation	21,946	17,383
Total Current Liabilities	337,487	238,836
Rate Reduction Bonds	14,974	29,294
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	449,979	441,577
Regulatory Liabilities Long-Term	52,473	52,418
Accrued Pension, PBOP and SERP	186,836	220,129
Other Long-Term Liabilities	45,972	47,896
Total Deferred Credits and Other Liabilities	735,260	762,020
Capitalization:
Long-Term Debt	888,999	997,932
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	701,241	701,052
Retained Earnings	407,113	395,118
Accumulated Other Comprehensive Loss	(9,378)	(9,655)
Common Shareholders' Equity	1,098,976	1,086,515
Total Capitalization	1,987,975	2,084,447
Total Liabilities and Capitalization	3,075,696	3,114,597
Western Massachusetts Electric Company [Member]
Current Assets:
Cash	1,768	1
Receivables, Net	48,113	47,297
Accounts Receivable from Affiliated Companies	154	164
Unbilled Revenues	16,071	16,192
Taxes Receivable	3	15,513
Regulatory Assets Current	43,534	42,370
Marketable Securities - Current	30,588	27,352
Prepayments and Other Current Assets	7,571	7,963
Total Current Assets	147,802	156,852
Property, Plant and Equipment, Net	1,305,743	1,290,498
Deferred Debits and Other Assets:
Regulatory Assets Long Term	207,901	221,752
Marketable Securities	27,169	30,342
Other Long-Term Assets	24,018	23,625
Total Deferred Debits and Other Assets	259,088	275,719
Total Assets	1,712,633	1,723,069
Current Liabilities:
Notes Payable To Affiliated Companies	43,400	31,900
Long-Term Debt - Current Portion	55,000	55,000
Accounts Payable - Current	44,303	68,141
Accounts Payable to Affiliated Companies	3,061	7,103
Accrued Interest	1,918	8,304
Regulatory Liability Current	15,638	21,037
Other Liabilities - Current	32,756	24,909
Total Current Liabilities	196,076	216,394
Rate Reduction Bonds	4,636	9,352
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	316,727	303,111
Regulatory Liabilities Long-Term	9,736	9,686
Accrued Pension, PBOP and SERP	35,431	36,099
Other Long-Term Liabilities	33,203	40,148
Total Deferred Credits and Other Liabilities	395,097	389,044
Capitalization:
Long-Term Debt	550,057	550,270
Common Shareholders' Equity:
Common Stock	10,866	10,866
Capital Surplus, Paid In	390,485	390,412
Retained Earnings	169,179	160,577
Accumulated Other Comprehensive Loss	(3,763)	(3,846)
Common Shareholders' Equity	566,767	558,009
Total Capitalization	1,116,824	1,108,279
Total Liabilities and Capitalization	1,712,633	1,723,069
NSTAR Electric Company [Member]
Current Assets:
Cash	17,109	13,695
Receivables, Net	233,438	202,025
Accounts Receivable from Affiliated Companies	303,699	160,176
Unbilled Revenues	35,895	41,377
Regulatory Assets Current	309,559	347,081
Prepayments and Other Current Assets	42,425	28,086
Total Current Assets	942,125	792,440
Property, Plant and Equipment, Net	4,788,158	4,735,297
Deferred Debits and Other Assets:
Regulatory Assets Long Term	1,489,317	1,444,870
Other Long-Term Assets	57,036	87,382
Total Deferred Debits and Other Assets	1,546,353	1,532,252
Total Assets	7,276,636	7,059,989
Current Liabilities:
Notes Payable to Banks	308,000	276,000
Long-Term Debt - Current Portion	1,650	1,650
Accounts Payable - Current	205,738	168,611
Accounts Payable to Affiliated Companies	353,037	247,061
Deferred Tax Liabilities Current	84,096	104,668
Regulatory Liability Current	67,277	47,539
Other Liabilities - Current	148,360	144,433
Total Current Liabilities	1,168,158	989,962
Rate Reduction Bonds	0	43,493
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,365,951	1,321,026
Regulatory Liabilities Long-Term	248,376	244,224
Accrued Pension, PBOP and SERP	362,432	360,932
Other Long-Term Liabilities	171,439	183,190
DueToRelatedPartiesNoncurrent	65,668	70,221
Total Deferred Credits and Other Liabilities	2,213,866	2,179,593
Capitalization:
Long-Term Debt	1,600,950	1,600,911
Noncontrolling Interest in Consolidated Subsidiary:
Temporary Equity, Carrying Amount, Attributable to Noncontrolling Interest	43,000	43,000
Common Shareholders' Equity:
Common Stock	0	0
Capital Surplus, Paid In	992,625	992,625
Retained Earnings	1,258,037	1,210,405
Common Shareholders' Equity	2,250,662	2,203,030
Total Capitalization	3,894,612	3,846,941
Total Liabilities and Capitalization	$ 7,276,636	$ 7,059,989

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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Public Utility Property Plant And Equipment [Line Items]
Public Utilities Property Plant And Equipment Distribution	$ 11,504,000,000	$ 11,438,200,000
Public Utilities Property Plant And Equipment Distribution Natural Gas	2,290,800,000	2,274,200,000
Public Utilities Property Plant And Equipment Transmission	5,721,200,000	5,541,100,000
Public Utilities Property Plant And Equipment Generation Or Processing	1,146,700,000	1,146,600,000
Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total	20,662,700,000	20,400,100,000
Public Utilities Property Plant And Equipment Other Property Plant And Equipment	503,000,000	429,300,000
Public Utilities Property Plant And Equipment Plant In Service	21,165,700,000	20,829,400,000
ElectricAndNaturalGasUtilityAccumulatedDepreciation	(5,157,700,000)	(5,065,100,000)
OtherAccumulatedDepreciation	(178,500,000)	(171,500,000)
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(5,336,200,000)	(5,236,600,000)
Property Plant And Equipment Net Excluding Construction Work In Progress	15,829,500,000	15,592,800,000
Public Utilities Property Plant And Equipment Construction Work In Progress	908,000,000	1,012,200,000
Property, Plant and Equipment, Net	16,737,549,000	16,605,010,000
The Connecticut Light And Power Company [Member]
Public Utility Property Plant And Equipment [Line Items]
Public Utilities Property Plant And Equipment Distribution	4,724,300,000	4,691,300,000
Public Utilities Property Plant And Equipment Transmission	2,874,600,000	2,796,100,000
Public Utilities Property Plant And Equipment Generation Or Processing	0	0
Public Utilities Property Plant And Equipment Plant In Service	7,598,900,000	7,487,400,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1,727,500,000)	(1,698,100,000)
Property Plant And Equipment Net Excluding Construction Work In Progress	5,871,400,000	5,789,300,000
Public Utilities Property Plant And Equipment Construction Work In Progress	313,200,000	363,700,000
Property, Plant and Equipment, Net	6,184,628,000	6,152,959,000
NSTAR Electric Company [Member]
Public Utility Property Plant And Equipment [Line Items]
Public Utilities Property Plant And Equipment Distribution	4,552,000,000	4,539,900,000
Public Utilities Property Plant And Equipment Transmission	1,542,800,000	1,529,700,000
Public Utilities Property Plant And Equipment Generation Or Processing	0	0
Public Utilities Property Plant And Equipment Plant In Service	6,094,800,000	6,069,600,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1,573,200,000)	(1,540,100,000)
Property Plant And Equipment Net Excluding Construction Work In Progress	4,521,600,000	4,529,500,000
Public Utilities Property Plant And Equipment Construction Work In Progress	266,600,000	205,800,000
Property, Plant and Equipment, Net	4,788,158,000	4,735,297,000
Public Service Company Of New Hampshire [Member]
Public Utility Property Plant And Equipment [Line Items]
Public Utilities Property Plant And Equipment Distribution	1,535,700,000	1,520,100,000
Public Utilities Property Plant And Equipment Transmission	602,300,000	599,200,000
Public Utilities Property Plant And Equipment Generation Or Processing	1,125,600,000	1,125,500,000
Public Utilities Property Plant And Equipment Plant In Service	3,263,600,000	3,244,800,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(968,400,000)	(954,000,000)
Property Plant And Equipment Net Excluding Construction Work In Progress	2,295,200,000	2,290,800,000
Public Utilities Property Plant And Equipment Construction Work In Progress	65,600,000	61,700,000
Property, Plant and Equipment, Net	2,360,753,000	2,352,515,000
Western Massachusetts Electric Company [Member]
Public Utility Property Plant And Equipment [Line Items]
Public Utilities Property Plant And Equipment Distribution	730,000,000	724,200,000
Public Utilities Property Plant And Equipment Transmission	656,700,000	583,700,000
Public Utilities Property Plant And Equipment Generation Or Processing	21,100,000	21,100,000
Public Utilities Property Plant And Equipment Plant In Service	1,407,800,000	1,329,000,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(257,500,000)	(252,100,000)
Property Plant And Equipment Net Excluding Construction Work In Progress	1,150,300,000	1,076,900,000
Public Utilities Property Plant And Equipment Construction Work In Progress	155,400,000	213,600,000
Property, Plant and Equipment, Net	$ 1,305,743,000	$ 1,290,498,000

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Significant Accounting Policies [Text Block]

NORTHEAST UTILITIES AND SUBSIDIARIES

THE CONNECTICUT LIGHT AND POWER COMPANY AND SUBSIDIARY

NSTAR ELECTRIC COMPANY AND SUBSIDIARIES

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

WESTERN MASSACHUSETTS ELECTRIC COMPANY AND SUBSIDIARY

COMBINED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

Refer to the Glossary of Terms included in this combined Quarterly Report on Form 10-Q for abbreviations and acronyms used throughout the combined notes to the unaudited condensed consolidated financial statements.

1.       SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A.       Basis of Presentation

NU is a public utility holding company primarily engaged through its wholly owned regulated utility subsidiaries in the energy delivery business.On April 10, 2012, NU acquired 100 percent of the outstanding common shares of NSTAR and NSTAR (through a successor, NSTAR LLC) became a direct wholly owned subsidiary of NU. NU's wholly owned regulated utility subsidiaries include CL&P, NSTAR Electric, PSNH, WMECO, Yankee Gas and NSTAR Gas. NU provides energy delivery service to approximately 3.6 million electric and natural gas customers through six regulated utilities in Connecticut, Massachusetts and New Hampshire. NU's consolidated financial information does not include NSTAR and its subsidiaries' results of operations for the three months ended March 31, 2012. NSTAR Electric continues to maintain reporting requirements as an SEC registrant. The information disclosed for NSTAR Electric represents its results of operations for the three months ended March 31, 2013 and 2012, presented on a comparable basis.

The accompanying unaudited condensed consolidated financial statements of NU, CL&P, NSTAR Electric, PSNH and WMECO include the accounts of each of their respective subsidiaries and are herein referred to as “consolidated financial statements.” Intercompany transactions have been eliminated in consolidation.

The combined notes to consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual consolidated financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying consolidated financial statements should be read in conjunction with the entirety of this combined Quarterly Report on Form 10-Q and the 2012 combined Annual Report on Form 10-K of NU, CL&P, NSTAR Electric, PSNH and WMECO (NU 2012 Form 10-K), which was filed with the SEC. The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The consolidated financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly NU's and the above companies' financial positions as of March 31, 2013 and December 31, 2012 and the results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012. The results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012 are not necessarily indicative of the results expected for a full year. The demand for electricity and natural gas is affected by weather conditions, economic conditions, and consumer conservation behavior. Electric energy sales and revenues are typically higher in the winter and summer months than in the spring and fall months. Natural gas sales and revenues are typically higher in the winter months than during other periods of the year.

NU consolidates CYAPC and YAEC as CL&P's, NSTAR Electric's, PSNH's and WMECO's combined ownership interest ineach of these entities is greater than 50 percent.Intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and the CYAPC and YAEC companies have been eliminated in consolidation. For CL&P, NSTAR Electric, PSNH and WMECO, the investment in CYAPC and YAEC continue to be accounted for under the equity method.

NU's utility subsidiaries are subject to the application of accounting guidance for entities with rate-regulated operations that considers the effect of regulation resulting from differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. NU's utility subsidiaries' energy delivery business is subject to rate-regulation that is based on cost recovery and meets the criteria for application of rate-regulated accounting. See Note 2, "Regulatory Accounting," for further information.

Certain prior period amounts in NSTAR Electric's accompanying consolidated statements of income and cash flows have been reclassified between line items for comparative purposes and in order to conform to NU's presentation. The reclassifications did not affect NSTAR Electric's net income.

The NSTAR Electric consolidated statement of cash flows was revised to correct an error in the presentation of cash deposits related to the RRBs. The impact of this revision was an increase in investing cash inflows from Other Investing Activities in an amount of $24.8 million and a corresponding increase to financing cash outflows from Retirements of Rate Reduction Bonds for the three months ended March 31, 2012. This revision had no impact on NSTAR Electric's results of operations or cash balance and is not deemed material, individually or in the aggregate, to the previously issued consolidated financial statements.

Certain changes in classification and corresponding reclassifications of prior period data were made in the accompanying consolidated statements of income and statements of cash flows for NU, CL&P, PSNH and WMECO for comparative purposes to conform to the current period presentation. The consolidated statement of income reflects the reclassification of transmission expenses from Other Operating Expenses, as originally reported, to Purchased Power, Fuel and Transmission and the reclassification of energy efficiency expenses primarily from Other Operating Expenses, as originally reported, to Energy Efficiency Programs. In addition, Other Operating Expenses and Maintenance, as originally reported, were combined and are reported in aggregate as Operations and Maintenance.

	For the Three Months Ended March 31, 2012
(Millions of Dollars)	Transmission Expense		Energy Efficiency Expense
NU	$	(2.7)	$	37.3
CL&P		(2.9)		22.0
PSNH		7.9		3.6
WMECO		1.0		5.6

Effective January 1, 2012, NSTAR Electric changed its estimates with respect to the allowance for doubtful accounts, incurred but not reported claims on medical benefits, general and workers' compensation liabilities and compensation accruals. The total aggregate impact of these changes in estimates on NSTAR Electric's accompanying consolidated statement of income was a decrease to net income of $11.4 million, after-tax, for the three months ended March 31, 2012.

NU evaluates events and transactions that occur after the balance sheet date but before financial statements are issued and recognizes in the financial statements the effects of all subsequent events that provide additional evidence about conditions that existed as of the balance sheet date and discloses, but does not recognize, in the financial statements subsequent events that provide evidence about the conditions that arose after the balance sheet date but before the financial statements are issued. See Note 6, "Short-Term and Long-Term Debt," for further information.

B.       Recently Adopted Accounting Standards

In the first quarter of 2013, NU adopted the following Financial Accounting Standards Board's (FASB) final Accounting Standards Updates (ASU) relating to additional disclosure requirements:

• Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income Requires entities to disclose additional information about items reclassified out of AOCI. The ASU does not change existing guidance on which items should be reclassified out of AOCI but requires disclosures about the components of AOCI and the amount of reclassification adjustments to be presented in one location. The ASU is effective beginning in the first quarter of 2013 and is applied prospectively. For further information, see Note 11, “Accumulated Other Comprehensive Income/(Loss),” to the consolidated financial statements. The ASU did not affect the calculation of net income, comprehensive income or EPSand did not have an impact on financial position, results of operations or cash flows.
• Clarifying the Scope of Disclosures about Offsetting Assets and LiabilitiesClarifies the scope of the offsetting disclosure requirements under GAAP. The disclosure requirements apply to derivative instruments, do not change existing guidance on which items should be offset in the balance sheets andrequire disclosures about the items that are offset. The ASU is effective beginning in the first quarter of 2013 with retrospective application. For further information, see Note 4, “Derivative Instruments,” to the consolidated financial statements. The ASU did not have an impact on financial position, results of operations or cash flows.

C.Provision for Uncollectible Accounts

NU, including CL&P, NSTAR Electric, PSNH and WMECO, presents its receivables at net realizable value by maintaining a provision for uncollectible amounts. This provision is determined based upon a variety of factors, including applying an estimated uncollectible account percentage to each receivable aging category, based upon historical collection and write-off experience and management's assessment of collectibility from individual customers. Management assesses the collectibility of receivables, and if circumstances change, collectibility estimates are adjusted accordingly. Receivable balances are written off against the provision for uncollectible accounts when the accounts are terminated and these balances are deemed to be uncollectible.

The provision for uncollectible accounts, which is included in Receivables, Net on the consolidated balance sheets, was as follows:

(Millions of Dollars)	As of March 31, 2013		As of December 31, 2012
NU	$	178.6	$	165.5
CL&P		85.0		77.6
NSTAR Electric		44.8		44.1
PSNH		7.4		6.8
WMECO		9.0		8.5

D.Restricted Cash and Other Deposits

As of March 31, 2013, NU, CL&P and PSNH had $3.8million, $1.4million and $1.7million, respectively, of restricted cash, primarily relating to amounts held in escrow, insurance proceeds on bondable property at PSNH and amounts related to the sale of land, which were included in Prepayments and Other Current Assets on the consolidated balance sheets. As of December 31, 2012,these amounts were $3.3 million, $1.3million and $1.7 million for NU, CL&P and PSNH, respectively.

As of March 31, 2013,NU had $12.8million of cash collateral posted not subject to master netting agreements. As of December 31, 2012, this amount was $14.6 million.

E.       Fair Value Measurements

NU, including CL&P, NSTAR Electric, PSNH, and WMECO, applies fair value measurement guidance to derivative contracts recorded at fair value and to the marketable securities held in the NU supplemental benefit trust, WMECO's spent nuclear fuel trust and CYAPC's and YAEC's nuclear decommissioning trusts. Fair value measurement guidance is also applied to investment valuations used to calculate the funded status of NU's Pension and PBOP Plans, including NSTAR Electric's Pension Plan, and nonrecurring fair value measurements of nonfinancial assets such as goodwill and AROs.

Fair Value Hierarchy:In measuring fair value, NU uses observable market data when available and minimizes the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. NU evaluates the classification of assets and liabilities measured at fair value on a quarterly basis, and NU's policy is to recognize transfers between levels of the fair value hierarchy as of the end of the reporting period. The three levels of the fair value hierarchy are described below:

Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date.  Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable.

Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products.

Determination of Fair Value: The valuation techniques and inputs used in NU's fair value measurements are described in Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to theconsolidated financial statements.

F.Other Income, Net

Items included within Other Income, Net on the consolidated statements of income primarily consist of investment income/(loss), interest income, AFUDC related to equity funds and equity in earnings.For CL&P, NSTAR Electric, PSNH and WMECO, equity in earnings relate to investments in CYAPC, YAEC and MYAPC and also NSTAR Electric's investment in two regional transmission companies, which are all accounted for on the equity method. On an NU consolidated basis, equity in earnings relate to the investment in MYAPC and NU's investment in two regional transmission companies.

G.       Other Taxes

Gross receipts taxes levied by the state of Connecticut are collected by CL&P and Yankee Gas from their respective customers. These gross receipts taxes are shown on a gross basis with collections in Operating Revenues and payments in Taxes Other Than Income Taxes on the consolidated statements of income as follows:

	For the Three Months Ended
(Millions of Dollars)	March 31, 2013		March 31, 2012
NU	$	38.4	$	35.0
CL&P		32.0		29.4

Certain sales taxes are also collected by CL&P, NSTAR Electric andWMECO from their respective customers as agents for state and local governments and are recorded on a net basis with no impact on the consolidated statements of income.

H.	Supplemental Cash Flow Information
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)		As of March 31, 2013		As of March 31, 2012
NU		$	98.7	$	138.5
CL&P			28.2		36.6
NSTAR Electric (1)			30.7		29.5
PSNH			12.9		32.5
WMECO			15.8		56.6
(1) NSTAR Electric amounts are not included in NU consolidated as of March 31, 2012.

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COMMON SHAREHOLDER EQUIT AND NCI (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Shareholders' Equity, Beginning Balance	$ 9,237,050,000
Net Income	229,968,000	100,755,000
Net Income Attributable to Noncontrolling Interests	1,879,000	1,493,000
Other Comprehensive Income (Loss), Net of Tax	1,956,000	1,864,000
Shareholders' Equity, Ending Balance	9,345,231,000
Common Shareholders Equity [Member]
Shareholders' Equity, Beginning Balance	9,237,100,000	4,012,700,000
Net Income	230,000,000	100,800,000
Dividends on Common Shares	(116,400,000)	(52,600,000)
Dividends, Preferred Stock	(1,900,000)	(1,400,000)
Issuance of Common Shares	8,400,000	6,200,000
Other Transcations, Net	(14,000,000)	800,000
Net Income Attributable to Noncontrolling Interests		(100,000)
Other Comprehensive Income (Loss), Net of Tax	2,000,000	1,900,000
Shareholders' Equity, Ending Balance	9,345,200,000	4,068,300,000
Noncontrolling Interest Member
Shareholders' Equity, Beginning Balance		3,000,000
Contributions To Northern Pass Trans		300,000
Net Income Attributable to Noncontrolling Interests		100,000
Shareholders' Equity, Ending Balance		3,400,000
Total Equity [Member]
Shareholders' Equity, Beginning Balance		4,015,700,000
Net Income		100,800,000
Dividends on Common Shares		(52,600,000)
Dividends, Preferred Stock		(1,400,000)
Issuance of Common Shares		6,200,000
Contributions To Northern Pass Trans		300,000
Other Transcations, Net		800,000
Other Comprehensive Income (Loss), Net of Tax		1,900,000
Shareholders' Equity, Ending Balance		4,071,700,000
Preferred Stock Member
Shareholders' Equity, Beginning Balance	155,600,000	116,200,000
Dividends, Preferred Stock	(1,900,000)	(1,400,000)
Net Income Attributable to Noncontrolling Interests	1,900,000	1,400,000
Shareholders' Equity, Ending Balance	$ 155,600,000	$ 116,200,000

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COMMON SHARES (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Stock by Class [Text Block]

12.       COMMON SHARES

The following table sets forth the NU common shares and the shares of CL&P, NSTAR Electric, PSNH and WMECO common stock authorized and issued as ofMarch 31, 2013 and December 31, 2012and the respective par values:

	Shares
	Authorized				Issued
	Per Share		As of		As of
	Par Value		March 31, 2013	December 31, 2012	March 31, 2013		December 31, 2012
NU	$	5	380,000,000	380,000,000		332,951,956		332,509,383
CL&P	$	10	24,500,000	24,500,000		6,035,205		6,035,205
NSTAR Electric	$	1	100,000,000	100,000,000		100		100
PSNH	$	1	100,000,000	100,000,000		301		301
WMECO	$	25	1,072,471	1,072,471		434,653		434,653

As of March 31, 2013 and December 31, 2012,18,356,487and 18,455,749 NU common shares were held as treasury shares, respectively.

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Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Reclassification Adjustments [Table Text Block]

	For the Three Months Ended March 31, 2012
(Millions of Dollars)	Transmission Expense		Energy Efficiency Expense
NU	$	(2.7)	$	37.3
CL&P		(2.9)		22.0
PSNH		7.9		3.6
WMECO		1.0		5.6

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COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU) (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Minority Interest Disclosure Text Block

13.		COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows:
			For the Three Months Ended
			March 31, 2013				March 31, 2012
					Noncontrolling								Noncontrolling
					Interest -								Interest -
			Common		Preferred		Common		Non-				Preferred
			Shareholders'		Stock of		Shareholders'		Controlling		Total		Stock of
(Millions of Dollars)			Equity		Subsidiaries		Equity		Interest		Equity		Subsidiaries
Balance - Beginning of Period			$	9,237.1	$	155.6	$	4,012.7	$	3.0	$	4,015.7	$	116.2
Net Income				230.0		-		100.8		-		100.8		-
Dividends on Common Shares				(116.4)		-		(52.6)		-		(52.6)		-
Dividends on Preferred Stock				(1.9)		(1.9)		(1.4)		-		(1.4)		(1.4)
Issuance of Common Shares				8.4		-		6.2		-		6.2		-
Contributions to NPT				-		-		-		0.3		0.3		-
Other Transactions, Net				(14.0)		-		0.8		-		0.8		-
Net Income Attributable to
	Noncontrolling Interests			-		1.9		(0.1)		0.1		-		1.4
Other Comprehensive Income				2.0		-		1.9		-		1.9		-
Balance - End of Period			$	9,345.2	$	155.6	$	4,068.3	$	3.4	$	4,071.7	$	116.2

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Other Taxes (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

State Of Connecticut Gross Earnings Taxes [Table Text Block]

	For the Three Months Ended
(Millions of Dollars)	March 31, 2013		March 31, 2012
NU	$	38.4	$	35.0
CL&P		32.0		29.4

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REGULATORY ACCOUNTING

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Public Utilities Disclosure [Text Block]

2.       REGULATORY ACCOUNTING

The rates charged to the customers of NU's Regulated companies are designed to collect the companies' costs to provide service, including a return on investment. Therefore, the accounting policies of the Regulated companies apply GAAP applicable to rate-regulated enterprises and reflect the effects of the rate-making process.

Management believes it is probable that the Regulated companies will recover their respective investments in long-lived assets, including regulatory assets. If management determined that it could no longer apply the accounting guidance applicable to rate-regulated enterprises to any of the Regulated companies' operations, or that management could not conclude it is probable that costs would be recovered in future rates, the costs would be charged to net income in the period in which the determination is made.

Regulatory Assets: The components of regulatory assets are as follows:

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Benefit Costs	$	2,390.4	$	2,452.1
Regulatory Assets Offsetting Derivative Liabilities		835.0		885.6
Goodwill		532.5		537.6
Storm Restoration Costs		656.1		547.7
Income Taxes, Net		521.7		516.2
Securitized Assets		157.6		232.6
Contractual Obligations		124.9		217.6
Power Contracts Buy Out Agreements		87.3		92.9
Regulatory Tracker Deferrals		177.2		190.1
Asset Retirement Obligations		90.2		88.8
Other Regulatory Assets		67.7		76.2
Total Regulatory Assets		5,640.6		5,837.4
Less: Current Portion		625.5		705.0
Total Long-Term Regulatory Assets	$	5,015.1	$	5,132.4

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Benefit Costs		$	546.9	$	769.0	$	217.2	$	112.6	$	563.2	$	781.2	$	223.7	$	116.0
Regulatory Assets Offsetting
	Derivative Liabilities		819.6		13.6		-		1.8		866.2		14.9		-		3.0
Goodwill			-		457.2		-		-		-		461.5		-		-
Storm Restoration Costs			448.7		132.7		32.3		42.4		413.9		55.8		34.5		43.5
Income Taxes, Net			371.7		46.7		37.3		31.1		367.5		47.1		36.2		31.0
Securitized Assets			-		149.5		5.0		3.1		-		205.1		19.7		7.8
Contractual Obligations			59.7		20.9		-		13.7		64.0		22.8		-		14.9
Power Contracts Buy Out Agreements			-		80.7		6.6		-		-		85.9		7.0		-
Regulatory Tracker Deferrals			10.1		84.5		49.7		31.3		12.2		71.4		49.3		31.9
Asset Retirement Obligations			30.0		29.8		14.3		3.6		29.4		29.4		14.2		3.5
Other Regulatory Assets			27.3		14.3		29.1		11.8		27.9		16.9		29.4		12.6
Total Regulatory Assets			2,314.0		1,798.9		391.5		251.4		2,344.3		1,792.0		414.0		264.2
Less: Current Portion			172.9		309.6		62.2		43.5		185.9		347.1		62.9		42.4
Total Long-Term Regulatory Assets		$	2,141.1	$	1,489.3	$	329.3	$	207.9	$	2,158.4	$	1,444.9	$	351.1	$	221.8

Storm Restoration Costs: The storm restoration cost deferrals relate to costs incurred at CL&P, NSTAR Electric, PSNH and WMECO that each company expects to collect from customers. A storm must meet certain criteria specific to each state and utility company to be declared a major storm. Once a storm is declared major, all qualifying expenses incurred during storm restoration efforts, if deemed prudent, are deferred and recovered from customers in future periods. In Connecticut, qualifying storm restoration costs must exceed $5 million for a storm to be declared a major storm. In Massachusetts, qualifying storm restoration costs must exceed $1 million for NSTAR Electric and $300,000 for WMECO and an emergency response plan must be initiated for a storm to be declared a major storm. In New Hampshire, (1) at least 10 percent of customers must be without power with at least 200 concurrent locations requiring repairs (trouble spots), or (2) at least 300 concurrent trouble spots must be reported for a storm to be declared a major storm.In addition, PSNH is permitted to defer pre-staging costs for storms that may not ultimately qualify as a major storm.

On February 8, 2013, a blizzard caused damage to the electric delivery systems of CL&P and NSTAR Electric. This blizzard resulted in estimated deferred storm restoration costs of approximately $13 million at CL&P and approximately $80 million at NSTAR Electric. On January 31, 2013, a major storm caused damage to CL&P's electric delivery system, which resulted in estimated deferred storm restoration costs of approximately $19 million. Management believes these storm restoration costs meet the criteria for specific cost recovery in Connecticut and Massachusetts and, as a result, are probable of recovery. Therefore, management does not expect these storms to have a material impact on CL&P's or NSTAR Electric's results of operations. CL&P and NSTAR Electric will seek recovery of these deferred storm restoration costs through their applicable regulatory recovery process.

Regulatory Costs Not Yet Approved:The Regulated companies had $78.8million ($3.7 million for CL&P, $26.3 million for NSTAR Electric, $37.2million for PSNH, and $6 million for WMECO) and $69.9 million ($3.9 million for CL&P, $25.4 million for NSTAR Electric, $35.7 million for PSNH, and $1.4 million for WMECO) of regulatory costs as of March 31, 2013 and December 31, 2012, respectively, which were included in Other Long-Term Assets on the consolidated balance sheets. These amounts represent incurred costs that have not yet been approved for recovery by the applicable regulatory agency. Management believes it is probable that these costs will ultimately be approved and recovered from customers.

Regulatory Liabilities: The components of regulatory liabilities are as follows:

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Cost of Removal	$	441.3	$	440.8
Regulatory Tracker Deferrals		147.0		95.1
AFUDC Transmission Incentive		68.9		70.0
Spent Nuclear Fuel Costs and Contractual Obligations		15.4		15.4
Other Regulatory Liabilities		50.6		53.0
Total Regulatory Liabilities		723.2		674.3
Less: Current Portion		191.7		134.1
Total Long-Term Regulatory Liabilities	$	531.5	$	540.2

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Cost of Removal		$	39.3	$	244.5	$	51.3	$	-	$	44.2	$	240.3	$	51.2	$	-
Regulatory Tracker Deferrals			39.1		37.3		13.8		12.5		39.1		14.4		20.4		13.7
AFUDC Transmission Incentive			55.5		4.1		-		9.3		56.6		4.1		-		9.3
Spent Nuclear Fuel Costs and
	Contractual Obligations		15.4		-		-		-		15.4		-		-		-
Wholesale Transmission Overcollections			2.3		-		1.1		0.9		-		-		-		5.3
Other Regulatory Liabilities			1.4		29.8		4.4		2.6		1.1		32.9		3.8		2.4
Total Regulatory Liabilities			153.0		315.7		70.6		25.3		156.4		291.7		75.4		30.7
Less: Current Portion			42.3		67.3		18.1		15.6		32.1		47.5		23.0		21.0
Total Long-Term Regulatory Liabilities		$	110.7	$	248.4	$	52.5	$	9.7	$	124.3	$	244.2	$	52.4	$	9.7

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Revenues	$ 1,995,023	$ 1,099,623
Operating Expenses:
Purchased Power and Transmission	747,809	395,344
Operations and Maintenance	346,092	261,963
Depreciation	154,977	80,839
Amortization of Regulatory Assets/(Liabilities), Net	54,049	5,426
Amortization of Rate Reduction Bonds	34,499	18,347
Energy Efficiency Programs	105,771	37,273
Taxes Other Than Income Taxes	132,881	86,038
Total Operating Expenses	1,576,078	885,230
Operating Income	418,945	214,393
Interest Expense:
Interest on Long-Term Debt	85,295	59,968
Interest on Rate Reduction Bonds	611	1,431
Other Interest	(9,651)	5,048
Total Interest Expense	76,255	66,447
Other Income/(Loss), Net	7,765	8,773
Income Before Income Tax Expense	350,455	156,719
Income Tax Expense	120,487	55,964
Net Income	229,968	100,755
Net Income Attributable to Noncontrolling Interests	1,879	1,493
Net Income Attributable to Controlling Interests	228,089	99,262
Earnings Per Share Basic And Diluted	$ 0.72	$ 0.56
Common Stock Dividends Per Share Declared	$ 0.37	$ 0.29
Weighted Average Common Shares Outstanding:
Basic	315,129,782	178,055,716
Diluted	316,002,538	178,437,453
The Connecticut Light And Power Company [Member]
Operating Revenues	624,097	591,965
Operating Expenses:
Purchased Power and Transmission	229,259	220,891
Operations and Maintenance	108,895	132,902
Depreciation	42,448	41,070
Amortization of Regulatory Assets/(Liabilities), Net	10,787	7,994
Energy Efficiency Programs	22,813	21,973
Taxes Other Than Income Taxes	60,192	55,270
Total Operating Expenses	474,394	480,100
Operating Income	149,703	111,865
Interest Expense:
Interest on Long-Term Debt	32,635	31,521
Other Interest	(2,941)	1,987
Total Interest Expense	29,694	33,508
Other Income/(Loss), Net	4,187	5,300
Income Before Income Tax Expense	124,196	83,657
Income Tax Expense	39,188	29,672
Net Income	85,008	53,985
Public Service Company Of New Hampshire [Member]
Operating Revenues	273,829	242,997
Operating Expenses:
Purchased Power and Transmission	101,024	81,049
Operations and Maintenance	59,729	64,979
Depreciation	22,568	21,208
Amortization of Regulatory Assets/(Liabilities), Net	(3,051)	(2,622)
Amortization of Rate Reduction Bonds	14,756	13,930
Energy Efficiency Programs	3,669	3,581
Taxes Other Than Income Taxes	17,016	15,486
Total Operating Expenses	215,711	197,611
Operating Income	58,118	45,386
Interest Expense:
Interest on Long-Term Debt	11,796	11,563
Interest on Rate Reduction Bonds	85	1,016
Other Interest	287	234
Total Interest Expense	12,168	12,813
Other Income/(Loss), Net	1,030	2,042
Income Before Income Tax Expense	46,980	34,615
Income Tax Expense	17,984	13,353
Net Income	28,996	21,262
Western Massachusetts Electric Company [Member]
Operating Revenues	124,953	114,025
Operating Expenses:
Purchased Power and Transmission	40,044	40,554
Operations and Maintenance	20,928	22,601
Depreciation	8,970	7,697
Amortization of Regulatory Assets/(Liabilities), Net	129	(343)
Amortization of Rate Reduction Bonds	4,689	4,418
Energy Efficiency Programs	8,315	5,556
Taxes Other Than Income Taxes	6,288	4,882
Total Operating Expenses	89,363	85,365
Operating Income	35,590	28,660
Interest Expense:
Interest on Long-Term Debt	5,955	5,766
Interest on Rate Reduction Bonds	127	415
Other Interest	211	214
Total Interest Expense	6,293	6,395
Other Income/(Loss), Net	1,004	1,092
Income Before Income Tax Expense	30,301	23,357
Income Tax Expense	11,698	9,171
Net Income	18,603	14,186
NSTAR Electric Company [Member]
Operating Revenues	592,257	556,476
Operating Expenses:
Purchased Power and Transmission	214,053	219,010
Operations and Maintenance	92,301	148,180
Depreciation	45,441	42,529
Amortization of Regulatory Assets/(Liabilities), Net	46,994	23,880
Amortization of Rate Reduction Bonds	15,054	22,581
Energy Efficiency Programs	51,703	46,904
Taxes Other Than Income Taxes	32,174	30,861
Total Operating Expenses	497,720	533,945
Operating Income	94,537	22,531
Interest Expense:
Interest on Long-Term Debt	19,592	22,288
Interest on Rate Reduction Bonds	399	1,326
Other Interest	(4,068)	(5,836)
Total Interest Expense	15,923	17,778
Other Income/(Loss), Net	773	1,222
Income Before Income Tax Expense	79,387	5,975
Income Tax Expense	31,265	2,035
Net Income	$ 48,122	$ 3,940

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COMMON SHARES

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Stock by Class [Text Block]

12.       COMMON SHARES

The following table sets forth the NU common shares and the shares of CL&P, NSTAR Electric, PSNH and WMECO common stock authorized and issued as ofMarch 31, 2013 and December 31, 2012and the respective par values:

	Shares
	Authorized				Issued
	Per Share		As of		As of
	Par Value		March 31, 2013	December 31, 2012	March 31, 2013		December 31, 2012
NU	$	5	380,000,000	380,000,000		332,951,956		332,509,383
CL&P	$	10	24,500,000	24,500,000		6,035,205		6,035,205
NSTAR Electric	$	1	100,000,000	100,000,000		100		100
PSNH	$	1	100,000,000	100,000,000		301		301
WMECO	$	25	1,072,471	1,072,471		434,653		434,653

As of March 31, 2013 and December 31, 2012,18,356,487and 18,455,749 NU common shares were held as treasury shares, respectively.

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DOCUMENT AND ENTITY INFORMATION (USD $)	3 Months Ended
	Mar. 31, 2013	Apr. 30, 2013	Jun. 30, 2012
Document And Entity [Line Items]
Entity Registrant Name	NORTHEAST UTILITIES
Document Period End Date	Mar. 31, 2013
Document Type	10-Q
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		314,621,345
Entity Public Float			$ 12,177,646,948
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
The Connecticut Light And Power Company [Member]
Document And Entity [Line Items]
Entity Registrant Name	The Connecticut Light and Power Company
Entity Central Index Key	0000023426
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Public Service Company Of New Hampshire [Member]
Document And Entity [Line Items]
Entity Registrant Name	Public Service Company of New Hampshire
Entity Central Index Key	0000315256
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Western Massachusetts Electric Company [Member]
Document And Entity [Line Items]
Entity Registrant Name	Western Massachusetts Electric Company
Entity Central Index Key	0000106170
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
NSTAR Electric Company [Member]
Document And Entity [Line Items]
Entity Registrant Name	NSTAR Electric Company
Entity Central Index Key	0000013372
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer

XML

COMMON SHARESHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

13.		COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (NU)
A summary of the changes in Common Shareholders' Equity and Noncontrolling Interests of NU is as follows:
			For the Three Months Ended
			March 31, 2013				March 31, 2012
					Noncontrolling								Noncontrolling
					Interest -								Interest -
			Common		Preferred		Common		Non-				Preferred
			Shareholders'		Stock of		Shareholders'		Controlling		Total		Stock of
(Millions of Dollars)			Equity		Subsidiaries		Equity		Interest		Equity		Subsidiaries
Balance - Beginning of Period			$	9,237.1	$	155.6	$	4,012.7	$	3.0	$	4,015.7	$	116.2
Net Income				230.0		-		100.8		-		100.8		-
Dividends on Common Shares				(116.4)		-		(52.6)		-		(52.6)		-
Dividends on Preferred Stock				(1.9)		(1.9)		(1.4)		-		(1.4)		(1.4)
Issuance of Common Shares				8.4		-		6.2		-		6.2		-
Contributions to NPT				-		-		-		0.3		0.3		-
Other Transactions, Net				(14.0)		-		0.8		-		0.8		-
Net Income Attributable to
	Noncontrolling Interests			-		1.9		(0.1)		0.1		-		1.4
Other Comprehensive Income				2.0		-		1.9		-		1.9		-
Balance - End of Period			$	9,345.2	$	155.6	$	4,068.3	$	3.4	$	4,071.7	$	116.2

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income	$ 229,968	$ 100,755
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	516	423
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(181)	34
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1,621	1,407
Other Comprehensive Income (Loss), Net of Tax, Total	1,956	1,864
Comprehensive Income Attributable to Noncontrolling Interests	(1,879)	(1,493)
Comprehensive Income	230,045	101,126
The Connecticut Light And Power Company [Member]
Net Income	85,008	53,985
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	111	111
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(6)	1
Other Comprehensive Income (Loss), Net of Tax, Total	105	112
Comprehensive Income	85,113	54,097
Public Service Company Of New Hampshire [Member]
Net Income	28,996	21,262
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	291	290
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(11)	2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3)
Other Comprehensive Income (Loss), Net of Tax, Total	277	292
Comprehensive Income	29,273	21,554
Western Massachusetts Electric Company [Member]
Net Income	18,603	14,186
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	85	85
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2)	0
Other Comprehensive Income (Loss), Net of Tax, Total	83	85
Comprehensive Income	18,686	14,271
NSTAR Electric Company [Member]
Net Income	$ 48,122	$ 3,940

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

7.PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS

NUSCO sponsors a defined benefit retirement plan that covers most employees, including CL&P, PSNH, and WMECO employees, hired before 2006 (or as negotiated, for bargaining unit employees), referred to as the NUSCO Pension Plan. NSTAR Electric serves as plan sponsor for a defined benefit retirement plan that covers most employeesof NSTAR Electric & Gas, hired before October 1, 2012, or as negotiated by bargaining unit employees, referred to as the NSTAR Pension Plan. Both plans are subject to the provisions of ERISA, as amended by the PPA of 2006. NUSCO and NSTAR Electric & Gas each maintain SERPs and other non-qualified defined benefit retirement plans (herein collectively referred to as the SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible current and retired participants that would have otherwise been provided under the Pension Plans.

NUSCO and NSTAR Electric & Gas also sponsorpostretirementbenefit plans that provide retiree medical, dental and life insurance benefits to employees that meet certain age and service eligibility requirements (NUSCO PBOP Plans and NSTAR PBOP Plan, respectively). Under certain circumstances, eligible retirees are required to contribute to the costs of postretirement benefits. The benefits provided under the NUSCO and NSTAR PBOP Plans are not vested and the Company has the right to modify any benefit provision.

The funded status of each of the plans is recorded on the respective sponsor's balance sheet: NUSCO (NUSCO Pension, NUSCO PBOP and NUSCO SERP), NSTAR Electric (NSTAR Pension) and NSTAR Electric & Gas (NSTAR SERP and NSTAR PBOP). The NUSCO plans are accounted for under the multiple-employer approach and the NSTAR plans are accounted for under the multi-employer approach. Accordingly, the balance sheet of NSTAR Electric reflects the full funded status of the NSTAR Pension Plan.

The components of net periodic benefit expense for the Pension Plans (including the SERP Plans) and PBOP Plans, the portion of pension amounts capitalized related to employees working on capital projects, and intercompany allocations not included in the net periodic benefit expense are as follows:

	Pension and SERP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	26.6	$	15.3
Interest Cost		51.4		38.1
Expected Return on Plan Assets		(70.3)		(42.5)
Actuarial Loss		52.9		30.1
Prior Service Cost		1.1		2.1
Total Net Periodic Benefit Expense	$	61.7	$	43.1
Capitalized Pension Expense	$	16.7	$	10.6
	PBOP
	For the Three Months Ended
	March 31, 2013		March 31, 2012
(Millions of Dollars)	NU		NU
Service Cost	$	4.8	$	2.3
Interest Cost		12.8		6.2
Expected Return on Plan Assets		(13.8)		(5.6)
Actuarial Loss		8.2		5.5
Prior Service Credit		(0.6)		(0.1)
Net Transition Obligation Cost		-		2.9
Total Net Periodic Benefit Expense	$	11.4	$	11.2

		Pension and SERP
		For the Three Months Ended March 31, 2013								For the Three Months Ended March 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric(1)		PSNH		WMECO
Service Cost		$	6.1	$	9.3	$	3.3	$	1.2	$	5.4	$	7.8	$	2.9	$	1.1
Interest Cost			12.1		14.2		6.0		2.5		12.8		14.8		6.1		2.6
Expected Return on Plan Assets			(18.5)		(22.0)		(7.7)		(4.3)		(17.5)		(16.5)		(6.7)		(4.1)
Actuarial Loss			14.1		14.5		5.5		3.0		11.9		15.7		3.9		2.5
Prior Service Cost/(Credit)			0.5		-		0.1		0.1		0.9		(0.2)		0.4		0.2
Total Net Periodic Benefit Expense		$	14.3	$	16.0	$	7.2	$	2.5	$	13.5	$	21.6	$	6.6	$	2.3
Related Intercompany
	Allocations	$	10.7	$	(2.0)	$	2.6	$	1.8	$	10.6	$	(3.1)	$	2.5	$	2.0
Capitalized Pension Expense		$	7.0	$	5.3	$	2.2	$	1.3	$	6.6	$	6.3	$	2.0	$	1.2

		PBOP
		For the Three Months Ended March 31, 2013						For the Three Months Ended March 31, 2012
(Millions of Dollars)		CL&P			PSNH		WMECO	CL&P		PSNH		WMECO
Service Cost		$	0.9	$	0.6	$	0.2	$	0.8	$	0.5	$	0.2
Interest Cost			2.0		1.0		0.4		2.4		1.2		0.5
Expected Return on Plan Assets			(2.5)		(1.3)		(0.6)		(2.3)		(1.1)		(0.5)
Actuarial Loss			1.7		0.9		0.3		2.0		1.0		0.3
Net Transition Obligation Cost			-		-		-		1.5		0.6		0.3
Total Net Periodic Benefit Expense		$	2.1	$	1.2	$	0.3	$	4.4	$	2.2	$	0.8
Related Intercompany
	Allocations	$	1.6	$	0.4	$	0.3	$	2.1	$	0.5	$	0.4

• NSTAR Electric amounts are not included in NU consolidated for the three months ended March 31, 2012.

For the NSTAR PBOP Plan, NSTAR allocates the net periodic postretirement expenses to its subsidiaries based on actual labor charges to each of its subsidiaries. The net periodic postretirement expense allocated to NSTAR Electric was $4.3 million and $9 million for the three months ended March 31, 2013 and 2012, respectively. The three months ended March 31, 2012 amount was not included in NU consolidated.

Contributions: NU's policy is to annually fund the NUSCO and NSTAR Pension Plans in an amount at least equal to an amount that will satisfy federal requirements. Based on the current status of the NUSCO Pension Plan, NU anticipates making a contribution of approximately $203 million in 2013, of which $107 million is required to meet minimum federal funding requirements. NSTAR Electric anticipates making a contribution of approximately $82 million in 2013 to the NSTAR Pension Plan, of which $38 million is required to meet minimum federal funding requirements. Contributions are being made in installments and began in January 2013. For the three months ended March 31, 2013, NU contributed $35.1 million to the NUSCO Pension Plan, all of which was contributed by PSNH, and NSTAR Electric contributed $4.3 million to the NSTAR Pension Plan.

For the PBOP Plans, it is NU's policy to annually fund the NUSCO PBOP Plans in an amount equal to the PBOP Plans' postretirement benefit cost, excluding curtailment and termination benefits, if applicable. NU anticipates making $25.7 million in contributions in 2013. NU contributes an amount that approximates annual benefit payments to the NSTAR PBOP Plan. NU anticipates making $30 million in contributions in 2013, of which $7.5 million was contributed during the three months ended March 31, 2013.

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SHORT TERM AND LONG TERM DEBT

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Debt Disclosure

6.SHORT-TERM AND LONG-TERM DEBT

Limits:  The amount of short-term borrowings that may be incurred by CL&P, NSTAR Electric and WMECO is subject to periodic approval by the FERC. On November 30, 2011, the FERC granted authorization to allow CL&P and WMECO to incur total short-term borrowings up to a maximum of $450 million and $300 million, respectively, effective January 1, 2012 through December 31, 2013. On March 22, 2012, the FERC approved CL&P's application requesting to increase its total short-term borrowing capacity from a maximum of $450 million to a maximum of $600 million for the authorization period through December 31, 2013. On May 16, 2012, the FERC granted authorization to allow NSTAR Electric to issue total short-term debt securities in an aggregate principal amount not to exceed $655 million outstanding at any one time, effective October 23, 2012 through October 23, 2014. As a result of the NHPUC having jurisdiction over PSNH's short-term debt, PSNH is not currently required to obtain FERC approval for its short-term borrowings.

Credit Agreements and Commercial Paper Programs:As of March 31, 2013 and December 31, 2012, NU had $979million and $1.15 billion, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $171 million of available borrowing capacity as of March 31, 2013. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.35 percent and 0.46 percent, respectively, which is generally based on money market rates. As of March 31, 2013, there were inter-company loans of $832 million from NU to its subsidiaries ($210.4 million at CL&P, $53.4 million at PSNH and $43.4 million at WMECO). As of December 31, 2012, there were inter-company loans of $987.5 million from NU to its subsidiaries ($405.1 million at CL&P, $63.3 million at PSNH, and $31.9 million at WMECO). As of March 31, 2013 and December 31, 2012, NSTAR Electric had $308 million and $276 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $142 million and $174 million, respectively, of available borrowing capacity. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.28 percent and 0.31 percent, respectively, which is generally based on money market rates.

Amounts outstanding under the commercial paper program are included inNotes Payable forNU and NSTAR Electric and classified in current liabilities on the consolidated balance sheets as management anticipates that all borrowings under these credit facilities will be outstanding for no more than 364 days at one time. Intercompany loans from NU to CL&P, PSNH and WMECO are included in Notes Payable to Affiliated Companies and classified in current liabilities on the consolidated balance sheets.

Long-Term Debt Issuances: On January 15, 2013, CL&P issued $400 million of Series A First and Refunding Mortgage Bonds with a coupon rate of 2.5 percent and a maturity date of January 15, 2023. The proceeds, net of issuance costs, were used to pay short-term borrowings outstanding under the CL&P credit agreement and the NU commercial paper program. Therefore, as of December 31, 2012, CL&P's credit agreement borrowings of $89 million and intercompany loans related to the commercial paper program of $305.8 million have been classified as Long-Term Debt on the consolidated balance sheet.

On May 1, 2013, PSNH redeemed at par approximately $109 million of the 2001 Series C PCRBs that were due to mature in 2021 with short-term debt. As a result, the PCRBs were recorded as Long-Term Debt- Current Portion.

Working Capital:NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and fund other corporate obligations, such as pension contributions.The current growth in NU's transmission construction expenditures utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period. In addition, NU's Regulated companies operate in an environment where recovery of its electric and natural gas distribution construction expenditures takes place over an extended period of time. This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs. These factors have resulted in NU's current liabilities exceeding current assets by approximately $1.7billion, $231 million, $226 million, $34 million and $48 million at NU, CL&P, NSTAR Electric, PSNH and WMECO, respectively, as of March 31, 2013.

As of March 31, 2013, $947.3 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months, consisting of $550 million for NU parent, $125 million for CL&P, $109 million for PSNH, $75 million for Yankee Gas and$55 million for WMECO. Approximately $32 million relates to the amortization of the purchase accounting fair value adjustment that will be amortized in the next twelve months. NU, with its strong credit ratings, has several options available in the financial markets to repay or refinance these maturities with the issuance of new long-term debt. NU, CL&P, NSTAR Electric, PSNH and WMECO will reduce their short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given capital requirements and maintenance of NU's credit rating and profile. Management expects the future operating cash flows of NU, CL&P, NSTAR Electric, PSNH and WMECO along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.

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Provision for Uncollectible Accounts (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accounts Notes Loans And Financing Receivable Text Block

(Millions of Dollars)	As of March 31, 2013		As of December 31, 2012
NU	$	178.6	$	165.5
CL&P		85.0		77.6
NSTAR Electric		44.8		44.1
PSNH		7.4		6.8
WMECO		9.0		8.5

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EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Earnings Per Share [Text Block]

14.       EARNINGS PER SHARE (NU)

Basic EPS is computed based upon the weighted average number of common shares outstanding during each period. Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect if certain share-based compensation awards are converted into common shares. For the three months ended March 31, 2013, there were 6,299share awards excluded from the computation as these awards were antidilutive. There were no antidilutive share awards for the three months ended March 31, 2012.

The following table sets forth the components of basic and diluted EPS:

		For the Three Months Ended March 31,
(Millions of Dollars, except share information)		2013		2012
Net Income Attributable to Controlling Interest		$	228.1	$	99.3
Weighted Average Common Shares Outstanding:
	Basic		315,129,782		178,055,716
	Dilutive Effect		872,756		381,737
	Diluted		316,002,538		178,437,453
Basic and Diluted EPS		$	0.72	$	0.56

On April 10, 2012, NU issued approximately 136 million common shares as a result of the merger with NSTAR, which are reflected in weighted average common shares outstanding as of March 31, 2013.

RSUs and performance shares are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. The dilutive effect of unvested RSUs and performance shares is calculated using the treasury stock method. Assumed proceeds of these units under the treasury stock method consist of the remaining compensation cost to be recognized and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the units (the difference between the market value of the average units outstanding for the period, using the average market price during the period, and the grant date market value).

The dilutive effect of stock options to purchase common shares is also calculated using the treasury stock method. Assumed proceeds for stock options consist of cash proceeds that would be received upon exercise, and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the stock options (the difference between the market value of the average stock options outstanding for the period, using the average market price during the period, and the exercise price).

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FAIR VALUE OF FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Fair Value Disclosures [Text Block]

10.       FAIR VALUE OF FINANCIAL INSTRUMENTS

The following methods and assumptions were used to estimate the fair value of each of the following financial instruments:

Preferred Stock, Long-Term Debt and Rate Reduction Bonds:The fair value of CL&P's and NSTAR Electric's preferred stock is based upon pricing models that incorporate interest rates and other market factors, valuations or trades of similar securities and cash flow projections. The fair value of fixed-rate long-term debt securities and RRBs is based upon pricing models that incorporate quoted market prices for those issues or similar issues adjusted for market conditions, credit ratings of the respective companies and treasury benchmark yields. Adjustable rate securities are assumed to have a fair value equal to their carrying value. The fair values provided in the tables below are classified as Level 2 within the fair value hierarchy. Carrying amounts and estimated fair values are as follows:

		As of March 31, 2013				As of December 31, 2012
		NU				NU
		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	155.6	$	154.2	$	155.6	$	152.2
Long-Term Debt			7,958.9		8,634.1		7,963.5		8,640.7
Rate Reduction Bonds			19.6		19.7		82.1		83.0

		As of March 31, 2013
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	111.6	$	43.0	$	42.6	$	-	$	-	$	-	$	-
Long-Term Debt			2,865.6		3,295.9		1,602.6		1,809.0		998.0		1,091.6		605.1		665.0
Rate Reduction Bonds			-		-		-		-		15.0		15.0		4.6		4.7
		As of December 31, 2012
		CL&P				NSTAR Electric				PSNH				WMECO
		Carrying		Fair		Carrying		Fair		Carrying		Fair		Carrying		Fair
(Millions of Dollars)		Amount		Value		Amount		Value		Amount		Value		Amount		Value
Preferred Stock Not
	Subject to Mandatory Redemption	$	116.2	$	110.0	$	43.0	$	42.2	$	-	$	-	$	-	$	-
Long-Term Debt			2,862.8		3,295.4		1,602.6		1,818.8		997.9		1,088.0		605.3		660.4
Rate Reduction Bonds			-		-		43.5		43.9		29.3		29.6		9.4		9.5

Derivative Instruments: NU, including CL&P, NSTAR Electric and WMECO, holds various derivative instruments that are carried at fair value. For further information, see Note 4, "Derivative Instruments," to the consolidated financial statements.

Other Financial Instruments: Investments in marketable securities are carried at fair value on the accompanying consolidated balance sheets. For further information, see Note 1E, "Summary of Significant Accounting Policies - Fair Value Measurements," and Note 5, "Marketable Securities," to the consolidated financial statements.

The carrying value of other financial instruments included in current assets and current liabilities, including cash and cash equivalents and special deposits, approximates their fair value due to the short-term nature of these instruments.

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 09, 2012	Mar. 31, 2013	Mar. 31, 2012
Notes To Consolidated Financial Statements [Abstract]
Net Income Attributable to Controlling Interests		$ 228,089	$ 99,262
Basic		315,129,782	178,055,716
Weighted Average Number Diluted Shares Outstanding Adjustment		872,756	381,737
Diluted		316,002,538	178,437,453
Earnings Per Share Basic And Diluted		$ 0.72	$ 0.56
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount		6,299	0
Common Stock Issuance Merger With Nstar [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	136,000,000

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INCOME TAXES

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Income Tax Disclosure [Text Block]

8.INCOME TAXES

Tax Positions: InMarch 2013, NU received a Final Determination from the Connecticut Department of Revenue Services (DRS) Appellate Division that concluded its audit of NU's Connecticut income tax returns for the years 2005 through 2008, bringing closure to, and effective settlement of, issues concerning the deductibility of expenses and credits through 2008. The DRS Determination resulted in total NU and CL&P after-tax benefits of $13.6 million and $6.9 million, respectively, recorded in the first quarter of 2013 that included a reduction in NU and CL&P pre-tax interest expense of $8.7 million and $4 million, or $5.2 million and $2.4 million after-tax, respectively. Further, the income tax expense impact resulted in a tax benefit to NU and CL&P of $8.4 million and $4.5 million after-tax, respectively. Management estimates that resolution of this audit decreases NU's and CL&P's unrecognized tax benefits by approximately $49.8 million and $39.4 million, respectively, that was largely offset by NU's and CL&P's valuation allowance and other tax impacts of $44.9 million and $36.5 million, respectively.

NU currently has open tax years. It is reasonably possible that at least one of these open tax years could be resolved within the next twelve months. Management estimates that the potential resolutions could result in a $1 million to $2 million decrease, net of any related valuation allowance,in unrecognized tax benefits for NU.

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COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Commitments and Contingencies Disclosure [Text Block]

9.       COMMITMENTS AND CONTINGENCIES

A.Environmental Matters

General: NU, CL&P, NSTAR Electric, PSNH and WMECO are subject to environmental laws and regulations intended to mitigate or remove the effect of past operations and improve or maintain the quality of the environment. These laws and regulations require the removal or the remedy of the effect on the environment of the disposal or release of certain specified hazardous substances at current and former operating sites. NU, CL&P, NSTAR Electric, PSNH and WMECO have an active environmental auditing and training program and believe that they are substantially in compliance with all enacted laws and regulations.

The number of environmental sites and reserves related to these sites for which remediation or long-term monitoring, preliminary site work or site assessment are being performed are as follows:

	As of March 31, 2013				As of December 31, 2012
			Reserve				Reserve
	Number of Sites		(in millions)		Number of Sites		(in millions)
NU		72	$	40.7		77	$	39.4
CL&P		19		3.6		19		3.7
NSTAR Electric		14		1.5		16		1.7
PSNH		16		5.6		16		4.9
WMECO		5		0.5		6		0.6

Included in the NU number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured gas from coal and other processes, which resulted in certain by-products remaining in the environment that may pose a potential risk to human health and the environment. The reserve balance related to these former MGP sites was $34.3 million and $34.5 million as of March 31, 2013 and December 31, 2012, respectively, and relates primarily to the natural gas business segment.

HWP: HWP, a subsidiary of NU, continues to investigate the potential need for additional remediation at a river site in Massachusetts containing tar deposits associated with an MGP site that HWP sold to HG&E, a municipal utility, dating back to 1902. HWP shares responsibility for site remediation with HG&E and has conducted substantial investigative and remediation activities. The cumulative expense recorded to the reserve for this site since 1994 through March 31, 2013 was $19.5million, of which $17.5million had been spent, leaving $2million in the reserve as of March 31, 2013. There were no charges recorded to the reserve for thethree months ended March 31, 2013 and 2012. HWP's share of the costs related to this site is not recoverable from customers.

The $2 million reserve balance as of March 31, 2013 represents estimated costs that HWP considers probable over the remaining life of the project, including testing and related costs in the near term and field activities to be agreed upon with the MA DEP, further studies and long-term monitoring that are expected to be required by the MA DEP, and certain soft tar remediation activities. Various factors could affect management's estimates and require an increase to the reserve, which would be reflected as a charge to Net Income. Although a material increase to the reserve is not presently anticipated, management cannot reasonably estimate potential additional investigation or remediation costs because these costs would depend on, among other things, the nature, extent and timing of additional investigation and remediation that may be required by the MA DEP.

B.       Deferred Contractual Obligations

CL&P, NSTAR Electric, PSNH and WMECO have decommissioning and plant closure cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear facilities and are now engaged in the long-term storage of their spent fuel. The Yankee Companies collect decommissioning and closure costs through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric, PSNH and WMECO. These companies in turn recover these costs from their customers through state regulatory commission-approved retail rates.

CL&P, NSTAR Electric, PSNH and WMECO's percentage share of the obligations to support the Yankee Companies under FERC-approved rate tariffs is the same as their respective ownership percentages in the Yankee Companies.

The Yankee Companies are currently collecting amounts that management believes are adequate to recover the remaining decommissioning and closure cost estimates for the respective plants. Management believes CL&P, NSTAR Electric and WMECO will recover their shares of these decommissioning and closure obligations from their customers. PSNH has already recovered its share of these costs from its customers.

Spent Nuclear Fuel Litigation:

DOE Phase I Damages - In 1998, the Yankee Companies filed separate complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal by January 31, 1998 pursuant to the terms of the 1983 spent fuel and high level waste disposal contracts between the Yankee Companies and the DOE (DOE Phase I Damages). Following multiple appeals filed by the DOE and cross-appeals filed by the Yankee Companies, on September 5, 2012, the judgment to award CYAPC $39.7 million, YAEC $38.2million and MYAPC $81.7 million became final and non-appealable and interest on the judgments began to accrue on or about December 5, 2012.

In January 2013, the proceeds from the DOE Phase I Damages Claim were received by CYAPC in the amount of $39.7million, YAEC in the amount of $38.2million, and MYAPC in the amount of $81.7 million. The funds were transferred to each Yankee Company's respective decommissioning trust. As a result of NU's consolidation of CYAPC and YAEC, the consolidated financial statements reflect an increase of $77.9 million in marketable securities for CYAPC and YAEC's Phase I damage awards that were invested in the nuclear decommissioning trusts as of March 31, 2013.

The final application of the proceeds for the benefit of customers of CL&P, NSTAR Electric, PSNH and WMECO will be determined following rate proceedings that were filed by each Yankee Company at FERC on May 1, 2013. Final FERC determinations are expected by the end of the third quarter of 2013.

C.       Guarantees and Indemnifications

NUparent, or NSTAR LLC, as applicable, provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, in the form of guarantees in the normal course of business.

NU provided guarantees and various indemnifications on behalf of external parties as a result of the sales of former subsidiaries of NU Enterprises, with maximum exposures either not specified or not material.

NU also issued a guaranty for the benefit of Hydro Renewable Energy under which, beginning at the time the Northern Pass Transmission line goes into commercial operation, NU will guarantee the financial obligations of NPT under the TSA in an amount not to exceed $25million. NU's obligations under the guaranty expire upon the full, final and indefeasible payment of the guaranteed obligations.

Management does not anticipate a material impact to Net Income as a result of these various guarantees and indemnifications.

The following table summarizes NU's guarantees of its subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, as of March 31, 2013:

		Maximum
		Exposure
Subsidiary	Description	(in millions)			Expiration Dates
Various	Surety Bonds	$	33.1		2013 - 2015 (1)
Various	NE Hydro Companies' Long-Term Debt	$	5.6		Unspecified
NUSCO and RRR	Lease Payments for Vehicles and Real Estate	$	19.2		2019 and 2024
NU Enterprises	Surety Bonds, Insurance Bonds and Performance Guarantees	$	67.8	(2)	(2)

(1)       Surety bond expiration dates reflect bond termination dates, the majority of which will be renewed or extended.

(2)       The maximum exposure includes $8.4million related to performance guarantees on wholesale purchase contracts, which expire December 31,2013. Also included in the maximum exposure is $1million related to insurance bonds with no expiration date that are billed annually on their anniversary date. The remaining $58.4million of maximum exposure relates to surety bonds covering ongoing projects, which expire upon project completion.

Many of the underlying contracts that NU parent guarantees, as well as certain surety bonds, contain credit ratings triggers that would require NU parent to post collateral in the event that the unsecured debt credit ratings of NU, or NSTAR LLC, as applicable, are downgraded.

D. FERC Base ROE Complaint

On September 30, 2011, several New England state attorneys general, state regulatory commissions, consumer advocates and other parties filed a joint complaint with the FERC under Sections 206 and 306 of the Federal Power Act alleging that the base ROE used in calculating formula rates for transmission service under the ISO-NE Open Access Transmission Tariff by New England transmission owners, including CL&P, NSTAR Electric, PSNH and WMECO, is unjust and unreasonable. The complainants asserted that the current 11.14 percent rate, which became effective in 2006, is excessive due to changes in the capital markets and are seeking an order to reduce the rate, which would be effective October 1, 2011. In response, the New England transmission owners filed testimony and analysis based on standard FERC methodology and precedent, demonstrating that the base ROE of 11.14 percent remained just and reasonable. The FERC set the case for trial before a FERC administrative law judge after settlement negotiations were unsuccessful in August 2012.

As part of the pre-trial process, on April 17, 2013, the complainants, the Massachusetts municipal electric utilities (late intervenors to the case), and the FERC trial staff updated their respective ROE analyses, which demonstrated a base ROE of approximately 8.9 percent. The New England transmission owners' also filed an updated analysis, including a supplement on April 26, 2013, that continues to demonstrate that the current ROE of 11.14 percent remains within an updated range of reasonableness of 7.3 percent to 13.2 percent. Hearings on this complaint are scheduled to commence on May 6, 2013 and the trial judge's recommended decision is due in September 2013. A decision from FERC commissioners is expected in 2014. Refunds to customers, if any, as a result of a reduction in the NU transmission companies' base ROE would be for the period October 1, 2011 through December 31, 2012.

On December 27, 2012, several additional parties filed a separate complaint concerning the New England transmission owners' base ROE with the FERC. This new complaint seeks to reduce the New England transmission owners' base ROE effective January 1, 2013, effectively extending the refund period for an additional 15 months, and to consolidate this new complaint with the joint complaint filed on September 30, 2011. The New England transmission owners have asked the FERC to reject this new complaint. The FERC has not yet acted on this request.

E.       DPU Safety and Reliability Programs - CPSL (NSTAR Electric)

Since 2006, NSTAR Electric has been recovering incremental costs related to the DPU-approved Safety and Reliability Programs. From 2006 through 2011, cumulative costs associated with the CPSL program resulted in an incremental revenue requirement to customers of approximately $83 million. These amounts included incremental operations and maintenance costs and the related revenue requirement for specific capital investments relative to the CPSL programs.

On May 28, 2010, the DPU issued an order on NSTAR Electric's 2006 CPSL cost recovery filing (the May 2010 Order). In 2010, NSTAR Electric filed a reconciliation of the cumulative CPSL program activity for the periods 2006 through 2009 with the DPU in order to determine a proposed rate adjustment. The DPU allowed the proposed rates to go into effect January 1, 2011, subject to final reconciliation of CPSL program costs through a future DPU proceeding. In February 2013, NSTAR Electric updated the October 2010 filing with final activity through 2011.

NSTAR Electric cannot predict the timing of a final DPU order related to its CPSL filings for the period 2006 through 2011. Therefore, NSTAR Electric recorded its 2006 through 2011 revenues under the CPSL programs based on the May 2010 Order. While management does not believe that any subsequent DPU order would result in revenues that are materially different than the amounts already recognized, it is reasonably possible that an order could have a material impact on NSTAR Electric's results of operations, financial position and cash flows.

F.       Basic Service Bad Debt Adder (NSTAR Electric)

In accordance with a generic DPU order, electric utilities in Massachusetts recover the energy-related portion of bad debt costs in their Basic Service rates. In 2007, NSTAR Electric filed its 2006 Basic Service reconciliation with the DPU proposing an adjustment related to the increase of its Basic Service bad debt charge-offs. The DPU issued an order approving the implementation of a revised Basic Service rate but instructed NSTAR Electric to reduce distribution rates by an amount equal to the increase in its Basic Service bad debt charge-offs. This adjustment to NSTAR Electric's distribution rates would eliminate the fully reconciling nature of the Basic Service bad debt adder.

In 2010, NSTAR Electric filed an appeal of the DPU's order with the SJC. In 2012, the SJC vacated the DPU order and remanded the matter to the DPU for further review.

NSTAR Electric deferred approximately $34 million of costs associated with energy-related bad debt as a regulatory asset through 2011 as NSTAR Electric had concluded that it was probable that these costs would ultimately be recovered from customers. Due to the delays and duration of the proceedings, NSTAR Electric concluded that while an ultimate outcome on the matter in its favor remained "more likely than not," it could no longer be deemed "probable." As a result, NSTAR Electric recognized a reserve related to the regulatory asset in the first quarter of 2011. NSTAR Electric will continue to maintain the reserve until the ultimate outcome is determined by the DPU.

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ACCUMULATED OTHER COMPREHENSIVE INCOME

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Comprehensive Income Note [Text Block]

11.       ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

The changes in accumulated other comprehensive income/(loss) by component, net of tax, is as follows:

	For the Three Months Ended March 31, 2013
(Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Available-for-Sale Securities		Pension, SERP and PBOP Benefit Plans		Total
AOCI as of January 1, 2013	$	(16.4)	$	1.3	$	(57.8)	$	(72.9)
Other Comprehensive Income Before Reclassifications		-		(0.1)		-		(0.1)
Amounts Reclassified from AOCI		0.5		-		1.6		2.1
Net Other Comprehensive Income		0.5		(0.1)		1.6		2.0
AOCI as of March 31, 2013	$	(15.9)	$	1.2	$	(56.2)	$	(70.9)

NU's qualified cash flow hedging instruments represent interest rate swap agreements on debt issuances that were settled in prior years. The settlement amount was recorded in AOCI and is being amortized into Net Income over the term of the underlying debt instrument.CL&P, PSNH and WMECO continue to amortize interest rate swaps settled in prior years from AOCI into Interest Expense over the remaining life of the associated long-term debt, which are not material to their respective consolidated financial statements.

The following table sets forth the amounts reclassified from AOCI by component and the affected line item on the statement of income:

	For the Three Months Ended March 31, 2013
	Amount
	Reclassified		Statement of Income
(Millions of Dollars)	from AOCI		Line Item Impacted
Qualified Cash Flow Hedging Instruments	$	(0.8)	Interest Expense
Tax Benefit		0.3	Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	$	(0.5)
Pension, SERP and PBOP Benefit Plan Costs:
Amortization of Actuarial Losses	$	(2.6)	(1)
Amortization of Prior Service Cost		-	(1)
Total Pension, SERP and PBOP Benefit Plan Costs		(2.6)	(1)
Tax Benefit		1.0
Pension, SERP and PBOP Benefit Plan Costs, Net of Tax	$	(1.6)
Total Amount Reclassified from AOCI, Net of Tax	$	(2.1)

• These AOCI amounts are included in the computation of net periodic Pension, SERP and PBOP costs. See Note 7, “Pension Benefits and Postretirement Benefits Other Than Pensions,” for further information.

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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block

	For the Three Months Ended March 31, 2013
(Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Available-for-Sale Securities		Pension, SERP and PBOP Benefit Plans		Total
AOCI as of January 1, 2013	$	(16.4)	$	1.3	$	(57.8)	$	(72.9)
Other Comprehensive Income Before Reclassifications		-		(0.1)		-		(0.1)
Amounts Reclassified from AOCI		0.5		-		1.6		2.1
Net Other Comprehensive Income		0.5		(0.1)		1.6		2.0
AOCI as of March 31, 2013	$	(15.9)	$	1.2	$	(56.2)	$	(70.9)

	For the Three Months Ended March 31, 2013
	Amount
	Reclassified		Statement of Income
(Millions of Dollars)	from AOCI		Line Item Impacted
Qualified Cash Flow Hedging Instruments	$	(0.8)	Interest Expense
Tax Benefit		0.3	Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	$	(0.5)
Pension, SERP and PBOP Benefit Plan Costs:
Amortization of Actuarial Losses	$	(2.6)	(1)
Amortization of Prior Service Cost		-	(1)
Total Pension, SERP and PBOP Benefit Plan Costs		(2.6)	(1)
Tax Benefit		1.0
Pension, SERP and PBOP Benefit Plan Costs, Net of Tax	$	(1.6)
Total Amount Reclassified from AOCI, Net of Tax	$	(2.1)

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSIONS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	$ 26.6	$ 15.3
Defined Benefit Plan Interest Cost	51.4	38.1
Defined Benefit Plan, Expected Return on Plan Assets	(70.3)	(42.5)
Defined Benefit Plan, Amortization of Gains (Losses)	52.9	30.1
Defined Benefit Plan Amortization Of Prior Service Cost Credit	1.1	2.1
Defined Benefit Plan Net Periodic Benefit Cost	61.7	43.1
Amount Capitalized Pension Expense	16.7	10.6
DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	: NU’s policy is to annually fund the NUSCO and NSTAR Pension Plans in an amount at least equal to an amount that will satisfy federal requirements. Based on the current status of the NUSCO Pension Plan, NU anticipates making a contribution of approximately $203 million in 2013, of which $107 million is required to meet minimum federal funding requirements. NSTAR Electric anticipates making a contribution of approximately $82 million in 2013 to the NSTAR Pension Plan, of which $38 million is required to meet minimum federal funding requirements. Contributions are being made in installments and began in January 2013. For the three months ended March 31, 2013, NU contributed $35.1 million to the NUSCO Pension Plan, all of which was contributed by PSNH, and NSTAR Electric contributed $4.3 million to the NSTAR Pension Plan.
Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	4.8	2.3
Defined Benefit Plan Interest Cost	12.8	6.2
Defined Benefit Plan, Expected Return on Plan Assets	(13.8)	(5.6)
Defined Benefit Plan, Amortization of Gains (Losses)	8.2	5.5
Defined Benefit Plan Amortization Of Transition Obligations Assets		2.9
Defined Benefit Plan Amortization Of Prior Service Cost Credit	(0.6)	(0.1)
Defined Benefit Plan Net Periodic Benefit Cost	11.4	11.2
DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	For the PBOP Plans, it is NU’s policy to annually fund the NUSCO PBOP Plans in an amount equal to the PBOP Plans' postretirement benefit cost, excluding curtailment and termination benefits, if applicable. NU anticipates making $25.7 million in contributions in 2013. NU contributes an amount that approximates annual benefit payments to the NSTAR PBOP Plan. NU anticipates making $30 million in contributions in 2013, of which $7.5 million was contributed during the three months ended March 31, 2013.
The Connecticut Light And Power Company [Member] | Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	6.1	5.4
Defined Benefit Plan Interest Cost	12.1	12.8
Defined Benefit Plan, Expected Return on Plan Assets	(18.5)	(17.5)
Defined Benefit Plan, Amortization of Gains (Losses)	14.1	11.9
Defined Benefit Plan Amortization Of Prior Service Cost Credit	0.5	0.9
Defined Benefit Plan Net Periodic Benefit Cost	14.3	13.5
Related Intercompany Allocationsof Defined Benefit Expense	10.7	10.6
Amount Capitalized Pension Expense	7.0	6.6
The Connecticut Light And Power Company [Member] | Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	0.9	0.8
Defined Benefit Plan Interest Cost	2.0	2.4
Defined Benefit Plan, Expected Return on Plan Assets	(2.5)	(2.3)
Defined Benefit Plan, Amortization of Gains (Losses)	1.7	2.0
Defined Benefit Plan Amortization Of Transition Obligations Assets		1.5
Defined Benefit Plan Net Periodic Benefit Cost	2.1	4.4
Related Intercompany Allocationsof Defined Benefit Expense	1.6	2.1
NSTAR Electric Company [Member] | Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	9.3	7.8
Defined Benefit Plan Interest Cost	14.2	14.8
Defined Benefit Plan, Expected Return on Plan Assets	(22.0)	(16.5)
Defined Benefit Plan, Amortization of Gains (Losses)	14.5	15.7
Defined Benefit Plan Amortization Of Prior Service Cost Credit		(0.2)
Defined Benefit Plan Net Periodic Benefit Cost	16.0	21.6
Related Intercompany Allocationsof Defined Benefit Expense	(2.0)	(3.1)
Amount Capitalized Pension Expense	5.3	6.3
NSTAR Electric Company [Member] | Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Related Intercompany Allocationsof Defined Benefit Expense	4.3	9.0
Public Service Company Of New Hampshire [Member] | Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	3.3	2.9
Defined Benefit Plan Interest Cost	6.0	6.1
Defined Benefit Plan, Expected Return on Plan Assets	(7.7)	(6.7)
Defined Benefit Plan, Amortization of Gains (Losses)	5.5	3.9
Defined Benefit Plan Amortization Of Prior Service Cost Credit	0.1	0.4
Defined Benefit Plan Net Periodic Benefit Cost	7.2	6.6
Related Intercompany Allocationsof Defined Benefit Expense	2.6	2.5
Amount Capitalized Pension Expense	2.2	2.0
Public Service Company Of New Hampshire [Member] | Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	0.6	0.5
Defined Benefit Plan Interest Cost	1.0	1.2
Defined Benefit Plan, Expected Return on Plan Assets	(1.3)	(1.1)
Defined Benefit Plan, Amortization of Gains (Losses)	0.9	1.0
Defined Benefit Plan Amortization Of Transition Obligations Assets		0.6
Defined Benefit Plan Net Periodic Benefit Cost	1.2	2.2
Related Intercompany Allocationsof Defined Benefit Expense	0.4	0.5
Western Massachusetts Electric Company [Member] | Pension Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	1.2	1.1
Defined Benefit Plan Interest Cost	2.5	2.6
Defined Benefit Plan, Expected Return on Plan Assets	(4.3)	(4.1)
Defined Benefit Plan, Amortization of Gains (Losses)	3.0	2.5
Defined Benefit Plan Amortization Of Prior Service Cost Credit	0.1	0.2
Defined Benefit Plan Net Periodic Benefit Cost	2.5	2.3
Related Intercompany Allocationsof Defined Benefit Expense	1.8	2.0
Amount Capitalized Pension Expense	1.3	1.2
Western Massachusetts Electric Company [Member] | Other Postretirement Benefit Plans Defined Benefit Member
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan Service Cost	0.2	0.2
Defined Benefit Plan Interest Cost	0.4	0.5
Defined Benefit Plan, Expected Return on Plan Assets	(0.6)	(0.5)
Defined Benefit Plan, Amortization of Gains (Losses)	0.3	0.3
Defined Benefit Plan Amortization Of Transition Obligations Assets		0.3
Defined Benefit Plan Net Periodic Benefit Cost	0.3	0.8
Related Intercompany Allocationsof Defined Benefit Expense	$ 0.3	$ 0.4

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SIGNIFCANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Organization Consolidation And Presentation Of Financial Statements Disclosure Text Block

A.       Basis of Presentation

NU is a public utility holding company primarily engaged through its wholly owned regulated utility subsidiaries in the energy delivery business.On April 10, 2012, NU acquired 100 percent of the outstanding common shares of NSTAR and NSTAR (through a successor, NSTAR LLC) became a direct wholly owned subsidiary of NU. NU's wholly owned regulated utility subsidiaries include CL&P, NSTAR Electric, PSNH, WMECO, Yankee Gas and NSTAR Gas. NU provides energy delivery service to approximately 3.6 million electric and natural gas customers through six regulated utilities in Connecticut, Massachusetts and New Hampshire. NU's consolidated financial information does not include NSTAR and its subsidiaries' results of operations for the three months ended March 31, 2012. NSTAR Electric continues to maintain reporting requirements as an SEC registrant. The information disclosed for NSTAR Electric represents its results of operations for the three months ended March 31, 2013 and 2012, presented on a comparable basis.

The accompanying unaudited condensed consolidated financial statements of NU, CL&P, NSTAR Electric, PSNH and WMECO include the accounts of each of their respective subsidiaries and are herein referred to as “consolidated financial statements.” Intercompany transactions have been eliminated in consolidation.

The combined notes to consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures included in annual consolidated financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations. The accompanying consolidated financial statements should be read in conjunction with the entirety of this combined Quarterly Report on Form 10-Q and the 2012 combined Annual Report on Form 10-K of NU, CL&P, NSTAR Electric, PSNH and WMECO (NU 2012 Form 10-K), which was filed with the SEC. The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The consolidated financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly NU's and the above companies' financial positions as of March 31, 2013 and December 31, 2012 and the results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012. The results of operations, comprehensive income and cash flows for the three months ended March 31, 2013 and 2012 are not necessarily indicative of the results expected for a full year. The demand for electricity and natural gas is affected by weather conditions, economic conditions, and consumer conservation behavior. Electric energy sales and revenues are typically higher in the winter and summer months than in the spring and fall months. Natural gas sales and revenues are typically higher in the winter months than during other periods of the year.

NU consolidates CYAPC and YAEC as CL&P's, NSTAR Electric's, PSNH's and WMECO's combined ownership interest ineach of these entities is greater than 50 percent.Intercompany transactions between CL&P, NSTAR Electric, PSNH and WMECO and the CYAPC and YAEC companies have been eliminated in consolidation. For CL&P, NSTAR Electric, PSNH and WMECO, the investment in CYAPC and YAEC continue to be accounted for under the equity method.

NU's utility subsidiaries are subject to the application of accounting guidance for entities with rate-regulated operations that considers the effect of regulation resulting from differences in the timing of the recognition of certain revenues and expenses from those of other businesses and industries. NU's utility subsidiaries' energy delivery business is subject to rate-regulation that is based on cost recovery and meets the criteria for application of rate-regulated accounting. See Note 2, "Regulatory Accounting," for further information.

Certain prior period amounts in NSTAR Electric's accompanying consolidated statements of income and cash flows have been reclassified between line items for comparative purposes and in order to conform to NU's presentation. The reclassifications did not affect NSTAR Electric's net income.

The NSTAR Electric consolidated statement of cash flows was revised to correct an error in the presentation of cash deposits related to the RRBs. The impact of this revision was an increase in investing cash inflows from Other Investing Activities in an amount of $24.8 million and a corresponding increase to financing cash outflows from Retirements of Rate Reduction Bonds for the three months ended March 31, 2012. This revision had no impact on NSTAR Electric's results of operations or cash balance and is not deemed material, individually or in the aggregate, to the previously issued consolidated financial statements.

Certain changes in classification and corresponding reclassifications of prior period data were made in the accompanying consolidated statements of income and statements of cash flows for NU, CL&P, PSNH and WMECO for comparative purposes to conform to the current period presentation. The consolidated statement of income reflects the reclassification of transmission expenses from Other Operating Expenses, as originally reported, to Purchased Power, Fuel and Transmission and the reclassification of energy efficiency expenses primarily from Other Operating Expenses, as originally reported, to Energy Efficiency Programs. In addition, Other Operating Expenses and Maintenance, as originally reported, were combined and are reported in aggregate as Operations and Maintenance.

NU evaluates events and transactions that occur after the balance sheet date but before financial statements are issued and recognizes in the financial statements the effects of all subsequent events that provide additional evidence about conditions that existed as of the balance sheet date and discloses, but does not recognize, in the financial statements subsequent events that provide evidence about the conditions that arose after the balance sheet date but before the financial statements are issued. See Note 6, "Short-Term and Long-Term Debt," for further information.

Receivables Policy Text Block

NU, including CL&P, NSTAR Electric, PSNH and WMECO, presents its receivables at net realizable value by maintaining a provision for uncollectible amounts. This provision is determined based upon a variety of factors, including applying an estimated uncollectible account percentage to each receivable aging category, based upon historical collection and write-off experience and management's assessment of collectibility from individual customers. Management assesses the collectibility of receivables, and if circumstances change, collectibility estimates are adjusted accordingly. Receivable balances are written off against the provision for uncollectible accounts when the accounts are terminated and these balances are deemed to be uncollectible.

Fair Value Of Financial Instruments Policy

In measuring fair value, NU uses observable market data when available and minimizes the use of unobservable inputs. Inputs used in fair value measurements are categorized into three fair value hierarchy levels for disclosure purposes. The entire fair value measurement is categorized based on the lowest level of input that is significant to the fair value measurement. NU evaluates the classification of assets and liabilities measured at fair value on a quarterly basis, and NU's policy is to recognize transfers between levels of the fair value hierarchy as of the end of the reporting period. The three levels of the fair value hierarchy are described below:

Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities as of the reporting date.  Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 - Inputs are quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-derived valuations in which all significant inputs are observable.

Level 3 - Quoted market prices are not available. Fair value is derived from valuation techniques in which one or more significant inputs or assumptions are unobservable. Where possible, valuation techniques incorporate observable market inputs that can be validated to external sources such as industry exchanges, including prices of energy and energy-related products.

The following methods and assumptions were used to estimate the fair value of each of the following financial instruments:

Preferred Stock, Long-Term Debt and Rate Reduction Bonds:The fair value of CL&P's and NSTAR Electric's preferred stock is based upon pricing models that incorporate interest rates and other market factors, valuations or trades of similar securities and cash flow projections. The fair value of fixed-rate long-term debt securities and RRBs is based upon pricing models that incorporate quoted market prices for those issues or similar issues adjusted for market conditions, credit ratings of the respective companies and treasury benchmark yields. Adjustable rate securities are assumed to have a fair value equal to their carrying value. The fair values provided in the tables below are classified as Level 2 within the fair value hierarchy.

Other Taxes Policy

Certain sales taxes are also collected by CL&P, NSTAR Electric and WMECO from their respective customers as agents for state and local governments and are recorded on a net basis with no impact on the consolidated statements of income.

Public Utilities Policy Text Block

The rates charged to the customers of NU's Regulated companies are designed to collect the companies' costs to provide service, including a return on investment. Therefore, the accounting policies of the Regulated companies apply GAAP applicable to rate-regulated enterprises and reflect the effects of the rate-making process.

Management believes it is probable that the Regulated companies will recover their respective investments in long-lived assets, including regulatory assets. If management determined that it could no longer apply the accounting guidance applicable to rate-regulated enterprises to any of the Regulated companies' operations, or that management could not conclude it is probable that costs would be recovered in future rates, the costs would be charged to net income in the period in which the determination is made.

Derivatives Policy Text Block

4.       DERIVATIVE INSTRUMENTS

The Regulated companies purchase and procure energy and energy-related products for their customers, which are subject to price volatility. The costs associated with supplying energy to customers are recoverable through customer rates. The Regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative contracts, many of which meet the definition of and are designated as "normal purchases or normal sales" (normal) under the applicable accounting guidance, and the use of nonderivative contracts.

Derivative contracts that are not recorded as normal are recorded at fair value as current or long-term derivative assets or liabilities. For the Regulated companies, regulatory assets or liabilities are recorded for the changes in fair values of derivatives, as costs are, and management believes they will continue to be, recovered from or refunded in customer rates. For NU's remaining unregulated wholesale marketing contracts, changes in fair values of derivatives are included in Net Income. The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses or Operating Revenues on the consolidated statements of income, as applicable, as electricity or natural gas is delivered.

CL&P, NSTAR Electric and WMECO mitigate the risks associated with the price volatility of energy and energy-related products through the use of SS, LRS, and basic service contracts, which fix the price of electricity purchased for customers and are accounted for as normal. CL&P, NSTAR Electric and WMECO haveentered into derivative and nonderivative contracts for the purchase of energy and energy-related products and contracts that are derivatives. NU also has NYMEX future contracts in order to reduce variability associated with the purchase price of approximately 5.2millionMMBtu of natural gas.

The costs or benefits from all of the Regulated companies' derivative contracts are recoverable from or refundable to customers, and therefore, changes in fair value are recorded as Regulatory Assets or Regulatory Liabilities on the consolidated balance sheets.

The gross fair values of derivative assets and liabilities with the same counterparty are offset and reported as net Derivative Assets or Derivative Liabilities, with current and long-term portions, in theconsolidated balance sheets. Cash collateral posted or collected under master netting agreements is recorded as an offset to the derivative asset or liability.

Fair Value Measurements of Derivative Instruments

Valuation of Derivative Instruments:Derivative contracts classified as Level 2 in the fair value hierarchy relate to the financial contracts for natural gas futures and the remaining unregulated wholesale marketing sourcing contracts to purchase energy for periods in which prices are quoted in an active market. Prices are obtained from broker quotes and are based on actual market activity. The contracts are valued using the mid-point of the bid-ask spread. Valuations of these contracts also incorporate discount rates using the yield curve approach.

The fair value of derivative contracts classified as Level 3 utilizes significant unobservable inputs. The fair value is modeled using income techniques, such as discounted cash flow approaches adjusted for assumptions relating to exit price. Significant observable inputs for valuations of these contracts include energy and energy-related product prices in future years for which quoted prices in an active market exist. Fair value measurements categorized in Level 3 of the fair value hierarchy are prepared by individuals with expertise in valuation techniques, pricing of energy and energy-related products, and accounting requirements. The future power and capacity prices for periods that are not quoted in an active market or established at auction are based on available market data and are escalated based on estimates of inflation to address the full time period of the contract.

Valuations of derivative contracts using discounted cash flow methodology include assumptions regarding the timing and likelihood of scheduled payments and also reflect non-performance risk, including credit, using the default probability approach based on the counterparty's credit rating for assets and the company's credit rating for liabilities. Valuations incorporate estimates of premiums or discounts that would be required by a market participant to arrive at an exit price, using historical market transactions adjusted for the terms of the contract.

Marketable Securities Policy

5.       MARKETABLE SECURITIES (NU, WMECO)

NU maintains a supplemental benefit trust to fund certain of NU's non-qualified executive retirement benefit obligations and WMECO maintains a spent nuclear fuel trust to fund WMECO's prior period spent nuclear fuel liability, each of which hold marketable securities. These trusts are not subject to regulatory oversight by state or federal agencies. NU's marketable securities also include legally restricted trusts for the decommissioning of nuclear power plants that are part of CYAPC and YAEC.

The Company elects to record mutual funds purchased by the NU supplemental benefit trust at fair value. As such, any change in fair value of these mutual funds is reflected in Net Income. These mutual funds, classified as Level 1 in the fair value hierarchy, totaled $51.2million and $47million as of March 31, 2013 and December 31, 2012, respectively, and are included in current Marketable Securities. Net gains on these securities of $4.2million and$3.2million for the three months ended March 31, 2013 and 2012, respectively, were recorded in Other Income, Net on the consolidated statements of income. Dividend income is recorded when dividends are declared and is recorded in Other Income, Net on the consolidated statements of income. All other marketable securities are accounted for as available-for-sale.

U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates. Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instrument and also incorporating yield curves, credit spreads and specific bond terms and conditions. Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables. Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates and tranche information. Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields. Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

Environmental Costs Policy

Environmental Matters

General: NU, CL&P, NSTAR Electric, PSNH and WMECO are subject to environmental laws and regulations intended to mitigate or remove the effect of past operations and improve or maintain the quality of the environment. These laws and regulations require the removal or the remedy of the effect on the environment of the disposal or release of certain specified hazardous substances at current and former operating sites. NU, CL&P, NSTAR Electric, PSNH and WMECO have an active environmental auditing and training program and believe that they are substantially in compliance with all enacted laws and regulations.

Earnings Per Share Policy Text Block

Basic EPS is computed based upon the weighted average number of common shares outstanding during each period. Diluted EPS is computed on the basis of the weighted average number of common shares outstanding plus the potential dilutive effect if certain share-based compensation awards are converted into common shares.

RSUs and performance shares are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. The dilutive effect of unvested RSUs and performance shares is calculated using the treasury stock method. Assumed proceeds of these units under the treasury stock method consist of the remaining compensation cost to be recognized and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the units (the difference between the market value of the average units outstanding for the period, using the average market price during the period, and the grant date market value).

The dilutive effect of stock options to purchase common shares is also calculated using the treasury stock method. Assumed proceeds for stock options consist of cash proceeds that would be received upon exercise, and a theoretical tax benefit. The theoretical tax benefit is calculated as the tax impact of the intrinsic value of the stock options (the difference between the market value of the average stock options outstanding for the period, using the average market price during the period, and the exercise price).

Segment Reporting Policy Policy Text Block

SEGMENT INFORMATION (NU)

Presentation: NU is organized between the Electric Distribution, Electric Transmission and Natural Gas Distribution segments and Other based on a combination of factors, including the characteristics of each segments' products and services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates. These segments represented substantially all of NU's total consolidated revenues for the three month periods endedMarch 31, 2013 and2012. Revenues from the sale of electricity and natural gas primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer. The Electric Distribution segment includes the generation activities of PSNH and WMECO.

Other operations in the tables below primarily consists of 1) the equity in earnings of NU parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest income and expense related to the cash and debt of NU parent and NSTAR LLC, respectively, 2) the revenues and expenses of NU's service companies, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, and 4) the results of other subsidiaries, which are comprised of NU Enterprises, NSTAR Communications, Inc., RRR (a real estate subsidiary), the non-energy-related subsidiaries of Yankee and the remaining operations of HWP.

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension and PBOP expense or income.

As discussed in Note 1A, “Summary of Significant Accounting Policies – Basis of Presentation,” certain reclassifications of priorperioddata were made in the consolidated statements of income for NU. Accordingly, the corresponding items of segment information have been recast for prior periodsfor comparative purposes.

Pension And Other Postretirement Plans Policy

NUSCO sponsors a defined benefit retirement plan that covers most employees, including CL&P, PSNH, and WMECO employees, hired before 2006 (or as negotiated, for bargaining unit employees), referred to as the NUSCO Pension Plan. NSTAR Electric serves as plan sponsor for a defined benefit retirement plan that covers most employeesof NSTAR Electric & Gas, hired before October 1, 2012, or as negotiated by bargaining unit employees, referred to as the NSTAR Pension Plan. Both plans are subject to the provisions of ERISA, as amended by the PPA of 2006. NUSCO and NSTAR Electric & Gas each maintain SERPs and other non-qualified defined benefit retirement plans (herein collectively referred to as the SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible current and retired participants that would have otherwise been provided under the Pension Plans.

NUSCO and NSTAR Electric & Gas also sponsorpostretirementbenefit plans that provide retiree medical, dental and life insurance benefits to employees that meet certain age and service eligibility requirements (NUSCO PBOP Plans and NSTAR PBOP Plan, respectively). Under certain circumstances, eligible retirees are required to contribute to the costs of postretirement benefits. The benefits provided under the NUSCO and NSTAR PBOP Plans are not vested and the Company has the right to modify any benefit provision.

The funded status of each of the plans is recorded on the respective sponsor's balance sheet: NUSCO (NUSCO Pension, NUSCO PBOP and NUSCO SERP), NSTAR Electric (NSTAR Pension) and NSTAR Electric & Gas (NSTAR SERP and NSTAR PBOP). The NUSCO plans are accounted for under the multiple-employer approach and the NSTAR plans are accounted for under the multi-employer approach. Accordingly, the balance sheet of NSTAR Electric reflects the full funded status of the NSTAR Pension Plan.

The components of net periodic benefit expense for the Pension Plans (including the SERP Plans) and PBOP Plans, the portion of pension amounts capitalized related to employees working on capital projects, and intercompany allocations not included in the net periodic benefit expense are as follows:

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REGULATORY ACCOUNTING (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Regulatory Assets Text Block

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Benefit Costs	$	2,390.4	$	2,452.1
Regulatory Assets Offsetting Derivative Liabilities		835.0		885.6
Goodwill		532.5		537.6
Storm Restoration Costs		656.1		547.7
Income Taxes, Net		521.7		516.2
Securitized Assets		157.6		232.6
Contractual Obligations		124.9		217.6
Power Contracts Buy Out Agreements		87.3		92.9
Regulatory Tracker Deferrals		177.2		190.1
Asset Retirement Obligations		90.2		88.8
Other Regulatory Assets		67.7		76.2
Total Regulatory Assets		5,640.6		5,837.4
Less: Current Portion		625.5		705.0
Total Long-Term Regulatory Assets	$	5,015.1	$	5,132.4

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Benefit Costs		$	546.9	$	769.0	$	217.2	$	112.6	$	563.2	$	781.2	$	223.7	$	116.0
Regulatory Assets Offsetting
	Derivative Liabilities		819.6		13.6		-		1.8		866.2		14.9		-		3.0
Goodwill			-		457.2		-		-		-		461.5		-		-
Storm Restoration Costs			448.7		132.7		32.3		42.4		413.9		55.8		34.5		43.5
Income Taxes, Net			371.7		46.7		37.3		31.1		367.5		47.1		36.2		31.0
Securitized Assets			-		149.5		5.0		3.1		-		205.1		19.7		7.8
Contractual Obligations			59.7		20.9		-		13.7		64.0		22.8		-		14.9
Power Contracts Buy Out Agreements			-		80.7		6.6		-		-		85.9		7.0		-
Regulatory Tracker Deferrals			10.1		84.5		49.7		31.3		12.2		71.4		49.3		31.9
Asset Retirement Obligations			30.0		29.8		14.3		3.6		29.4		29.4		14.2		3.5
Other Regulatory Assets			27.3		14.3		29.1		11.8		27.9		16.9		29.4		12.6
Total Regulatory Assets			2,314.0		1,798.9		391.5		251.4		2,344.3		1,792.0		414.0		264.2
Less: Current Portion			172.9		309.6		62.2		43.5		185.9		347.1		62.9		42.4
Total Long-Term Regulatory Assets		$	2,141.1	$	1,489.3	$	329.3	$	207.9	$	2,158.4	$	1,444.9	$	351.1	$	221.8

Schedule Of Regulatory Liabilities Text Block

	As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)	NU		NU
Cost of Removal	$	441.3	$	440.8
Regulatory Tracker Deferrals		147.0		95.1
AFUDC Transmission Incentive		68.9		70.0
Spent Nuclear Fuel Costs and Contractual Obligations		15.4		15.4
Other Regulatory Liabilities		50.6		53.0
Total Regulatory Liabilities		723.2		674.3
Less: Current Portion		191.7		134.1
Total Long-Term Regulatory Liabilities	$	531.5	$	540.2

		As of March 31, 2013								As of December 31, 2012
				NSTAR								NSTAR
(Millions of Dollars)		CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Cost of Removal		$	39.3	$	244.5	$	51.3	$	-	$	44.2	$	240.3	$	51.2	$	-
Regulatory Tracker Deferrals			39.1		37.3		13.8		12.5		39.1		14.4		20.4		13.7
AFUDC Transmission Incentive			55.5		4.1		-		9.3		56.6		4.1		-		9.3
Spent Nuclear Fuel Costs and
	Contractual Obligations		15.4		-		-		-		15.4		-		-		-
Wholesale Transmission Overcollections			2.3		-		1.1		0.9		-		-		-		5.3
Other Regulatory Liabilities			1.4		29.8		4.4		2.6		1.1		32.9		3.8		2.4
Total Regulatory Liabilities			153.0		315.7		70.6		25.3		156.4		291.7		75.4		30.7
Less: Current Portion			42.3		67.3		18.1		15.6		32.1		47.5		23.0		21.0
Total Long-Term Regulatory Liabilities		$	110.7	$	248.4	$	52.5	$	9.7	$	124.3	$	244.2	$	52.4	$	9.7

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SHORT TERM AND LONG TERM DEBT (Details)	3 Months Ended
	Mar. 31, 2013
Line of Credit Facility [Line Items]
Short Term Debt Regulatory Limits	:  The amount of short-term borrowings that may be incurred by CL&P, NSTAR Electric and WMECO is subject to periodic approval by the FERC. On November 30, 2011, the FERC granted authorization to allow CL&P and WMECO to incur total short-term borrowings up to a maximum of $450 million and $300 million, respectively, effective January 1, 2012 through December 31, 2013. On March 22, 2012, the FERC approved CL&P's application requesting to increase its total short-term borrowing capacity from a maximum of $450 million to a maximum of $600 million for the authorization period through December 31, 2013. On May 16, 2012, the FERC granted authorization to allow NSTAR Electric to issue total short-term debt securities in an aggregate principal amount not to exceed $655 million outstanding at any one time, effective October 23, 2012 through October 23, 2014. As a result of the NHPUC having jurisdiction over PSNH's short-term debt, PSNH is not currently required to obtain FERC approval for its short-term borrowings.
Description of commercial paper program	As of March 31, 2013 and December 31, 2012, NU had $979 million and $1.15 billion, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $171 million of available borrowing capacity as of March 31, 2013. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.35 percent and 0.46 percent, respectively, which is generally based on money market rates. As of March 31, 2013, there were inter-company loans of $832 million from NU to its subsidiaries ($210.4 million at CL&P, $53.4 million at PSNH and $43.4 million at WMECO). As of December 31, 2012, there were inter-company loans of $987.5 million from NU to its subsidiaries ($405.1 million at CL&P, $63.3 million at PSNH, and $31.9 million at WMECO). As of March 31, 2013 and December 31, 2012, NSTAR Electric had $308 million and $276 million, respectively, in short-term borrowings outstanding under its commercial paper program, leaving $142 million and $174 million, respectively, of available borrowing capacity. The weighted-average interest rate on these borrowings as of March 31, 2013 and December 31, 2012 was 0.28 percent and 0.31 percent, respectively, which is generally based on money market rates. Amounts outstanding under the commercial paper program are included in Notes Payable for NU and NSTAR Electric and classified in current liabilities on the consolidated balance sheets as management anticipates that all borrowings under these credit facilities will be outstanding for no more than 364 days at one time. Intercompany loans from NU to CL&P, PSNH and WMECO are included in Notes Payable to Affiliated Companies and classified in current liabilities on the consolidated balance sheets.
Description of Working Capital	Working Capital: NU, CL&P, NSTAR Electric, PSNH and WMECO use their available capital resources to fund their respective construction expenditures, meet debt requirements, pay costs, including storm-related costs, pay dividends and fund other corporate obligations, such as pension contributions. The current growth in NU’s transmission construction expenditures utilizes a significant amount of cash for projects that have a long-term return on investment and recovery period. In addition, NU’s Regulated companies operate in an environment where recovery of its electric and natural gas distribution construction expenditures takes place over an extended period of time. This impacts the timing of the revenue stream designed to fully recover the total investment plus a return on the equity portion of the cost and related financing costs. These factors have resulted in NU’s current liabilities exceeding current assets by approximately $1.7 billion, $231 million, $226 million, $34 million and $48 million at NU, CL&P, NSTAR Electric, PSNH and WMECO, respectively, as of March 31, 2013. As of March 31, 2013, $947.3 million of NU's current liabilities relates to long-term debt that will be paid in the next 12 months, consisting of $550 million for NU parent, $125 million for CL&P, $109 million for PSNH, $75 million for Yankee Gas and $55 million for WMECO. Approximately $32 million relates to the amortization of the purchase accounting fair value adjustment that will be amortized in the next twelve months. NU, with its strong credit ratings, has several options available in the financial markets to repay or refinance these maturities with the issuance of new long-term debt. NU, CL&P, NSTAR Electric, PSNH and WMECO will reduce their short-term borrowings with cash received from operating cash flows or with the issuance of new long-term debt, as deemed appropriate given capital requirements and maintenance of NU's credit rating and profile. Management expects the future operating cash flows of NU, CL&P, NSTAR Electric, PSNH and WMECO along with the access to financial markets, will be sufficient to meet any future operating requirements and capital investment forecasted opportunities.
Description of LT debt reclassified to ST	On May 1, 2013, PSNH redeemed at par approximately $109 million of the 2001 Series C PCRBs that were due to mature in 2021 with short-term debt. As a result, the PCRBs were recorded as Long-Term Debt - Current Portion.
The Connecticut Light And Power Company [Member]
Line of Credit Facility [Line Items]
Long-term Debt, Description	On January 15, 2013, CL&P issued $400 million of Series A First and Refunding Mortgage Bonds with a coupon rate of 2.5 percent and a maturity date of January 15, 2023. The proceeds, net of issuance costs, were used to pay short-term borrowings outstanding under the CL&P credit agreement and the NU commercial paper program. Therefore, as of December 31, 2012, CL&P's credit agreement borrowings of $89 million and intercompany loans related to the commercial paper program of $305.8 million have been classified as Long-Term Debt on the consolidated balance sheet.

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Restricted Cash and Other Deposits (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Special Deposits [Line Items]
Restricted Cash And Cash Equivalents	$ 3.8	$ 3.3
Cash Collateral Deposited	12.8	14.6
The Connecticut Light And Power Company [Member]
Special Deposits [Line Items]
Restricted Cash And Cash Equivalents	1.4	1.3
Public Service Company Of New Hampshire [Member]
Special Deposits [Line Items]
Restricted Cash And Cash Equivalents	$ 1.7	$ 1.7

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CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities:
Net Income	$ 229,968	$ 100,755
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	154,977	80,839
Deferred Income Tax Expense (Benefit)	168,938	52,474
Pension and PBOP Expense, Net of PBOP Contributions	53,102	42,268
Pension and Other Postretirement Benefit Contributions	(47,048)	(98,910)
Regulatory (Underrecoveries)/Overrecoveries, Net	39,218	(27,569)
Amortization of Regulatory Assets/(Liabilities), Net	54,049	5,426
Amortization of Rate Reduction Bonds	34,499	18,347
Other Noncash Income (Expense)	(51,106)	(5,484)
Proceeds from DOE Damages Claim	77,936
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(129,431)	29,276
Inventory	28,487	30,108
Taxes Receivable/(Accrued)	(21,295)	11,758
Change in Accounts Payable	(86,916)	(190,232)
Other Current Assets and Liabilities	(32,235)	(40,240)
Net Cash Flows Provided by Operating Activities	473,143	8,816
Investing Activities:
Investments in Property, Plant and Equipment	(388,950)	(304,294)
Proceeds from Sales of Marketable Securities	98,070	40,947
Purchases of Marketable Securities	(184,030)	(41,570)
Other Investing Activities	27,997	2,448
Net Cash Flows Used in Investing Activities	(446,913)	(302,469)
Financing Activities:
Cash Dividends on Common Stock	(116,431)	(52,104)
Cash Dividends on Preferred Stock	(1,879)	(1,390)
Increase/(Decrease) in Short-Term Debt	(228,000)	343,000
Issuance of Long-Term Debt	400,000	300,000
Retirements of Rate Reduction Bonds	(62,529)	(17,903)
Other Financing Activities	(2,322)	(1,130)
Net Cash Flows Provided by/(Used in) Financing Activities	(11,161)	570,473
Net Increase/(Decrease) in Cash	15,069	276,820
Cash - Beginning of Year	45,748	6,559
Cash - End of Year	60,817	283,379
The Connecticut Light And Power Company [Member]
Operating Activities:
Net Income	85,008	53,985
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	42,448	41,070
Deferred Income Tax Expense (Benefit)	65,475	32,460
Pension and PBOP Expense, Net of PBOP Contributions	8,183	9,095
Regulatory (Underrecoveries)/Overrecoveries, Net	(15,835)	(39,407)
Amortization of Regulatory Assets/(Liabilities), Net	10,787	7,994
Other Noncash Income (Expense)	3,653	(6,399)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(32,041)	28,685
Taxes Receivable/(Accrued)	(12,777)	16,551
Change in Accounts Payable	(106,140)	(146,676)
Other Current Assets and Liabilities	(22,340)	(44,484)
Net Cash Flows Provided by Operating Activities	26,421	(47,126)
Investing Activities:
Investments in Property, Plant and Equipment	(89,360)	(108,842)
Other Investing Activities	447	1,139
Net Cash Flows Used in Investing Activities	(88,913)	(107,703)
Financing Activities:
Cash Dividends on Common Stock	(38,000)	(33,495)
Cash Dividends on Preferred Stock	(1,390)	(1,390)
Increase/(Decrease) in Short-Term Debt	(283,700)	194,750
Issuance of Long-Term Debt	400,000
Other Financing Activities	(6,112)	(1,200)
Net Cash Flows Provided by/(Used in) Financing Activities	70,798	158,665
Net Increase/(Decrease) in Cash	8,306	3,836
Cash - Beginning of Year	1	1
Cash - End of Year	8,307	3,837
Public Service Company Of New Hampshire [Member]
Operating Activities:
Net Income	28,996	21,262
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	22,568	21,208
Deferred Income Tax Expense (Benefit)	10,143	8,908
Pension and PBOP Expense, Net of PBOP Contributions	8,022	7,032
Pension and Other Postretirement Benefit Contributions	(35,146)	(89,012)
Regulatory (Underrecoveries)/Overrecoveries, Net	(799)	911
Amortization of Regulatory Assets/(Liabilities), Net	(3,051)	(2,622)
Amortization of Rate Reduction Bonds	14,756	13,930
Other Noncash Income (Expense)	(1,505)	9,569
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(13,889)	2,480
Inventory	562	9,361
Taxes Receivable/(Accrued)	23,137	10,138
Change in Accounts Payable	31,257	(16,073)
Other Current Assets and Liabilities	22,152	18,869
Net Cash Flows Provided by Operating Activities	107,203	15,961
Investing Activities:
Investments in Property, Plant and Equipment	(64,956)	(67,059)
(Increase) Decrease In Notes Receivable From Affiliated Company	0	55,900
Other Investing Activities	(17)	963
Net Cash Flows Used in Investing Activities	(64,973)	(10,196)
Financing Activities:
Cash Dividends on Common Stock	(17,000)	(42,891)
Increase/(Decrease) in Short-Term Debt	(9,900)	52,900
Retirements of Rate Reduction Bonds	(14,320)	(13,463)
Other Financing Activities	(127)	(116)
Net Cash Flows Provided by/(Used in) Financing Activities	(41,347)	(3,570)
Net Increase/(Decrease) in Cash	883	2,195
Cash - Beginning of Year	2,493	56
Cash - End of Year	3,376	2,251
Western Massachusetts Electric Company [Member]
Operating Activities:
Net Income	18,603	14,186
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	8,970	7,697
Deferred Income Tax Expense (Benefit)	16,828	9,198
Pension and PBOP Expense, Net of PBOP Contributions	1,246	1,766
Regulatory (Underrecoveries)/Overrecoveries, Net	(2,357)	(1,778)
Amortization of Regulatory Assets/(Liabilities), Net	129	(343)
Amortization of Rate Reduction Bonds	4,689	4,418
Other Noncash Income (Expense)	(2,545)	(1,071)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(4,907)	(2,274)
Taxes Receivable/(Accrued)	21,600	1,051
Change in Accounts Payable	17,667	(21,870)
Other Current Assets and Liabilities	(8,931)	(5,885)
Net Cash Flows Provided by Operating Activities	70,992	5,095
Investing Activities:
Investments in Property, Plant and Equipment	(66,340)	(85,011)
Proceeds from Sales of Marketable Securities	21,035	31,579
Purchases of Marketable Securities	21,191	31,680
(Increase) Decrease In Notes Receivable From Affiliated Company		(11,000)
Other Investing Activities	500	(169)
Net Cash Flows Used in Investing Activities	(65,996)	(74,281)
Financing Activities:
Cash Dividends on Common Stock	(10,000)	(9,432)
Increase/(Decrease) in Notes Payable to Affiliate	11,500	83,200
Retirements of Rate Reduction Bonds	4,716,000	4,440,000
Other Financing Activities	(13)	(17)
Net Cash Flows Provided by/(Used in) Financing Activities	(3,229)	69,311
Net Increase/(Decrease) in Cash	1,767	125
Cash - Beginning of Year	1	1
Cash - End of Year	1,768	126
NSTAR Electric Company [Member]
Operating Activities:
Net Income	48,122	3,940
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Bad Debt Expense	5,523	21,618
Depreciation	45,441	42,529
Deferred Income Tax Expense (Benefit)	26,571	(19,446)
Pension and PBOP Expense, Net of PBOP Contributions	6,420	16,997
Regulatory (Underrecoveries)/Overrecoveries, Net	(2,951)	24,719
Amortization of Regulatory Assets/(Liabilities), Net	46,994	23,880
Amortization of Rate Reduction Bonds	15,054	22,581
Other Noncash Income (Expense)	(23,969)	(22,647)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(174,978)	15,109
Inventory	(7,060)	(9,340)
Taxes Receivable/(Accrued)	(22,501)	14,645
Change in Accounts Payable	107,843	(72,303)
Other Current Assets and Liabilities	18,916	34,223
Net Cash Flows Provided by Operating Activities	89,425	96,505
Investing Activities:
Investments in Property, Plant and Equipment	(107,573)	(92,870)
Decrease in Other Deposits	33,631	25,898
Other Investing Activities	(86)	375
Net Cash Flows Used in Investing Activities	(74,028)	(66,597)
Financing Activities:
Cash Dividends on Common Stock	0	(57,100)
Cash Dividends on Preferred Stock	(490)	(490)
Increase/(Decrease) in Short-Term Debt	32,000	71,000
Retirements of Rate Reduction Bonds	(43,493)	(43,548)
Net Cash Flows Provided by/(Used in) Financing Activities	(11,983)	(30,138)
Net Increase/(Decrease) in Cash	3,414	(230)
Cash - Beginning of Year	13,695	9,373
Cash - End of Year	$ 17,109	$ 9,143

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MARKETABLE SECURITIES

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Marketable Securities [Text Block]

5.       MARKETABLE SECURITIES (NU, WMECO)

NU maintains a supplemental benefit trust to fund certain of NU's non-qualified executive retirement benefit obligations and WMECO maintains a spent nuclear fuel trust to fund WMECO's prior period spent nuclear fuel liability, each of which hold marketable securities. These trusts are not subject to regulatory oversight by state or federal agencies. NU's marketable securities also include legally restricted trusts for the decommissioning of nuclear power plants that are part of CYAPC and YAEC.

The Company elects to record mutual funds purchased by the NU supplemental benefit trust at fair value. As such, any change in fair value of these mutual funds is reflected in Net Income. These mutual funds, classified as Level 1 in the fair value hierarchy, totaled $51.2million and $47million as of March 31, 2013 and December 31, 2012, respectively, and are included in current Marketable Securities. Net gains on these securities of $4.2million and$3.2million for the three months ended March 31, 2013 and 2012, respectively, were recorded in Other Income, Net on the consolidated statements of income. Dividend income is recorded when dividends are declared and is recorded in Other Income, Net on the consolidated statements of income. All other marketable securities are accounted for as available-for-sale.

Available-for-Sale Securities: The following is a summary of NU's available-for-sale securities held in the NU supplemental benefit trust, WMECO's spent nuclear fuel trust and CYAPC and YAEC's nuclear decommissioning trusts. These securities are recorded at fair value and included in current and long-term Marketable Securities on the consolidated balance sheets.

		As of March 31, 2013
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	355.3	$	10.0	$	(0.1)	$	365.2
	Equity Securities (2)		144.0		30.7		-		174.7
WMECO
	Debt Securities		57.7		0.1		-		57.8
		As of December 31, 2012
				Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains(1)		Losses(1)		Fair Value
NU
	Debt Securities (2)	$	266.6	$	13.3	$	(0.1)	$	279.8
	Equity Securities (2)		145.5		20.0		-		165.5
WMECO
	Debt Securities		57.7		0.1		(0.1)		57.7

• Unrealized gains and losses on debt securities for the NU supplemental benefit trust and WMECO spent nuclear fuel trust are recorded in AOCI and Other Long-Term Assets, respectively, on the consolidated balance sheets.

(2)       NU's amounts include CYAPC's and YAEC's marketable securities held in nuclear decommissioning trusts of $434.9million and $340.4 million as of March 31, 2013 and December 31, 2012, respectively, the majority of which are legally restricted and can only be used for the decommissioning of the nuclear power plants owned by these companies. In 2013, CYAPC and YAEC received cash from the DOE that was invested in the nuclear decommissioning trusts. For further information see Note 9B “Commitments and Contingencies- Deferred Contractual Obligations” to the consolidated financial statements. Unrealized gains and losses for the nuclear decommissioning trusts are offset in Other Long-Term Liabilities on the consolidated balance sheets. All of the equity securities accounted for as available-for-sale securities are held in these trusts.

Unrealized Losses and Other-than-Temporary Impairment: There have been no significant unrealized losses, other-than-temporary impairments or credit losses for the NU supplemental benefit trust, the WMECO spent nuclear fuel trust, and in the trusts held by CYAPC and YAEC.Factors considered in determining whether a credit loss exists include the duration and severity of the impairment, adverse conditions specifically affecting the issuer, and the payment history, ratings and rating changes of the security. For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated.

Realized Gains and Losses: Realized gains and losses on available-for-sale securities are recorded in Other Income, Net for the NU supplemental benefit trust, Other Long-Term Assets for the WMECO spent nuclear fuel trust, and offset in Other Long-Term Liabilities for CYAPC and YAEC. NU utilizes the specific identification basis method for the NU supplemental benefit trust securities and the average cost basis method for the WMECO spent nuclear fuel trust and the CYAPC and YAEC nuclear decommissioning trusts to compute the realized gains and losses on the sale of available-for-sale securities.

Contractual Maturities: As of March 31, 2013, the contractual maturities of available-for-sale debt securities are as follows:

	NU				WMECO
	Amortized				Amortized
(Millions of Dollars)	Cost		Fair Value		Cost		Fair Value
Less than one year (1)	$	150.7	$	150.8	$	30.4	$	30.6
One to five years		62.2		63.5		18.7		18.5
Six to ten years		51.2		53.4		4.1		4.1
Greater than ten years		91.2		97.5		4.5		4.6
Total Debt Securities	$	355.3	$	365.2	$	57.7	$	57.8

(1)       Amounts in the Less than one year NU category include securities in the nuclear decommissioning trusts, which are restricted and are classified in long-term Marketable Securities on the consolidated balance sheets.

Fair Value Measurements: The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:

			NU				WMECO
			As of				As of
(Millions of Dollars)			March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Level 1:
	Mutual Funds and Equities		$	225.9	$	212.5	$	-	$	-
	Money Market Funds			120.1		40.2		3.6		5.2
Total Level 1			$	346.0	$	252.7	$	3.6	$	5.2
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)	$	78.5	$	69.9	$	18.2	$	18.7
	Corporate Debt Securities			41.1		33.0		11.7		7.0
	Asset-Backed Debt Securities			26.4		28.5		9.6		10.9
	Municipal Bonds			82.6		93.8		8.6		11.6
	Other Fixed Income Securities			16.5		14.4		6.1		4.3
Total Level 2			$	245.1	$	239.6	$	54.2	$	52.5
Total Marketable Securities			$	591.1	$	492.3	$	57.8	$	57.7

U.S. government issued debt securities are valued using market approaches that incorporate transactions for the same or similar bonds and adjustments for yields and maturity dates. Corporate debt securities are valued using a market approach, utilizing recent trades of the same or similar instrument and also incorporating yield curves, credit spreads and specific bond terms and conditions. Asset-backed debt securities include collateralized mortgage obligations, commercial mortgage backed securities, and securities collateralized by auto loans, credit card loans or receivables. Asset-backed debt securities are valued using recent trades of similar instruments, prepayment assumptions, yield curves, issuance and maturity dates and tranche information. Municipal bonds are valued using a market approach that incorporates reported trades and benchmark yields. Other fixed income securities are valued using pricing models, quoted prices of securities with similar characteristics, and discounted cash flows.

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COMMON SHARES (Details) (USD $)	0 Months Ended
	Apr. 09, 2012	Mar. 31, 2013	Dec. 31, 2012
Class Of Stock [Line Items]
Common Stock Par Or Stated Value Per Share		$ 5	$ 5
Common Stock Shares Authorized		380,000,000	380,000,000
Common Stock Shares Issued		332,951,956	332,509,383
Treasury Stock Shares		18,356,487	18,455,749
Common Stock Issuance Merger With Nstar [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	136,000,000
The Connecticut Light And Power Company [Member]
Class Of Stock [Line Items]
Common Stock Par Or Stated Value Per Share		$ 10	$ 10
Common Stock Shares Authorized		24,500,000	24,500,000
Common Stock Shares Issued		6,035,205	6,035,205
NSTAR Electric Company [Member]
Class Of Stock [Line Items]
Common Stock Par Or Stated Value Per Share		$ 1	$ 1
Common Stock Shares Authorized		100,000,000	100,000,000
Common Stock Shares Issued		100	100
Public Service Company Of New Hampshire [Member]
Class Of Stock [Line Items]
Common Stock Par Or Stated Value Per Share		$ 1	$ 1
Common Stock Shares Authorized		100,000,000	100,000,000
Common Stock Shares Issued		301	301
Western Massachusetts Electric Company [Member]
Class Of Stock [Line Items]
Common Stock Par Or Stated Value Per Share		$ 25	$ 25
Common Stock Shares Authorized		1,072,471	1,072,471
Common Stock Shares Issued		434,653	434,653

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PROPERTY, PLANT AND ACCUMULATED DEPRECIATION (Tables)

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule of Public Utility Property, Plant, and Equipment [Text Block]

3.PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize the NU, CL&P, NSTAR Electric, PSNH and WMECO investments in utility property, plant and equipment by asset category:

		As of March 31, 2013		As of December 31, 2012
(Millions of Dollars)		NU		NU
Distribution - Electric		$	11,504.0	$	11,438.2
Distribution - Natural Gas			2,290.8		2,274.2
Transmission			5,721.2		5,541.1
Generation			1,146.7		1,146.6
Electric and Natural Gas Utility			20,662.7		20,400.1
Other (1)			503.0		429.3
Property, Plant and Equipment, Gross			21,165.7		20,829.4
Less: Accumulated Depreciation
	Electric and Natural Gas Utility		(5,157.7)		(5,065.1)
	Other		(178.5)		(171.5)
Total Accumulated Depreciation			(5,336.2)		(5,236.6)
Property, Plant and Equipment, Net			15,829.5		15,592.8
Construction Work in Progress			908.0		1,012.2
Total Property, Plant and Equipment, Net		$	16,737.5	$	16,605.0

(1)These assets represent unregulated property and are primarily comprised of building improvements at RRR, software and equipment at NUSCO and telecommunications equipment at NSTAR Communications, Inc.

	As of March 31, 2013								As of December 31, 2012
			NSTAR								NSTAR
(Millions of Dollars)	CL&P		Electric		PSNH		WMECO		CL&P		Electric		PSNH		WMECO
Distribution	$	4,724.3	$	4,552.0	$	1,535.7	$	730.0	$	4,691.3	$	4,539.9	$	1,520.1	$	724.2
Transmission		2,874.6		1,542.8		602.3		656.7		2,796.1		1,529.7		599.2		583.7
Generation		-		-		1,125.6		21.1		-		-		1,125.5		21.1
Property, Plant and
Equipment, Gross		7,598.9		6,094.8		3,263.6		1,407.8		7,487.4		6,069.6		3,244.8		1,329.0
Less: Accumulated Depreciation		(1,727.5)		(1,573.2)		(968.4)		(257.5)		(1,698.1)		(1,540.1)		(954.0)		(252.1)
Property, Plant and Equipment, Net		5,871.4		4,521.6		2,295.2		1,150.3		5,789.3		4,529.5		2,290.8		1,076.9
Construction Work in Progress		313.2		266.6		65.6		155.4		363.7		205.8		61.7		213.6
Total Property, Plant and
Equipment, Net	$	6,184.6	$	4,788.2	$	2,360.8	$	1,305.7	$	6,153.0	$	4,735.3	$	2,352.5	$	1,290.5

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SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting Information [Line Items]

Schedule Of Segment Reporting Information By Segment Text Block

		For the Three Months Ended March 31, 2013
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	1,374.2	$	361.8	$	239.5	$	217.2	$	(197.7)	$	1,995.0
Depreciation and Amortization			(177.0)		(17.4)		(31.8)		(19.0)		1.7		(243.5)
Other Operating Expenses			(1,004.9)		(267.2)		(62.2)		(197.4)		199.2		(1,332.5)
Operating Income			192.3		77.2		145.5		0.8		3.2		419.0
Interest Expense			(42.1)		(7.4)		(21.9)		(6.4)		1.5		(76.3)
Interest Income			1.0		-		0.1		1.6		(1.6)		1.1
Other Income, Net			3.8		0.2		2.7		320.3		(320.3)		6.7
Income Tax (Expense)/Benefit			(54.3)		(26.7)		(45.8)		6.5		(0.2)		(120.5)
Net Income			100.7		43.3		80.6		322.8		(317.4)		230.0
Net Income Attributable
	to Noncontrolling Interests		(1.2)		-		(0.7)		-		-		(1.9)
Net Income Attributable
	to Controlling Interest	$	99.5	$	43.3	$	79.9	$	322.8	$	(317.4)	$	228.1
Total Assets (as of)		$	18,208.2	$	2,735.4	$	6,269.1	$	18,749.8	$	(17,633.8)	$	28,328.7
Cash Flows Used for
	Investments in Plant	$	157.8	$	31.2	$	185.4	$	14.6	$	-	$	389.0

		For the Three Months Ended March 31, 2012
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	786.0	$	139.0	$	162.8	$	133.3	$	(121.5)	$	1,099.6
Depreciation and Amortization			(72.2)		(7.7)		(21.1)		(3.9)		0.3		(104.6)
Other Operating Expenses			(622.1)		(102.2)		(47.6)		(134.9)		126.2		(780.6)
Operating Income/(Loss)			91.7		29.1		94.1		(5.5)		5.0		214.4
Interest Expense			(33.0)		(5.4)		(19.7)		(9.4)		1.1		(66.4)
Interest Income			1.1		-		0.1		1.3		(1.3)		1.2
Other Income, Net			4.4		-		3.3		122.6		(122.7)		7.6
Income Tax (Expense)/Benefit			(21.4)		(9.0)		(30.8)		6.0		(0.8)		(56.0)
Net Income			42.8		14.7		47.0		115.0		(118.7)		100.8
Net Income Attributable
	to Noncontrolling Interests		(0.8)		-		(0.7)		-		-		(1.5)
Net Income Attributable
	to Controlling Interest	$	42.0	$	14.7	$	46.3	$	115.0	$	(118.7)	$	99.3
Total Assets (as of)		$	9,553.3	$	1,498.2	$	3,900.7	$	7,261.7	$	(6,235.5)	$	15,978.4
Cash Flows Used for
	Investments in Plant	$	130.7	$	20.5	$	135.9	$	17.2	$	-	$	304.3

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SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Segment Reporting Disclosure [Text Block]

15.SEGMENT INFORMATION (NU)

Presentation: NU is organized between the Electric Distribution, Electric Transmission and Natural Gas Distribution segments and Other based on a combination of factors, including the characteristics of each segments' products and services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates. These segments represented substantially all of NU's total consolidated revenues for the three month periods endedMarch 31, 2013 and2012. Revenues from the sale of electricity and natural gas primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer. The Electric Distribution segment includes the generation activities of PSNH and WMECO.

Other operations in the tables below primarily consists of 1) the equity in earnings of NU parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest income and expense related to the cash and debt of NU parent and NSTAR LLC, respectively, 2) the revenues and expenses of NU's service companies, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, and 4) the results of other subsidiaries, which are comprised of NU Enterprises, NSTAR Communications, Inc., RRR (a real estate subsidiary), the non-energy-related subsidiaries of Yankee and the remaining operations of HWP.

Cash flows used for investments in plant included in the segment information below are cash capital expenditures that do not include amounts incurred but not paid, cost of removal, AFUDC related to equity funds, and the capitalized portions of pension and PBOP expense or income.

As discussed in Note 1A, “Summary of Significant Accounting Policies – Basis of Presentation,” certain reclassifications of priorperioddata were made in the consolidated statements of income for NU. Accordingly, the corresponding items of segment information have been recast for prior periodsfor comparative purposes.

NU's reportable segments are the combined Electric Distribution, Electric Transmission and Natural Gas Distribution segments, based upon the level at which NU's chief operating decision maker assesses performance and makes decisions about the allocation of company resources. Each of NU's subsidiaries, including CL&P, NSTAR Electric, PSNH and WMECO, has one reportable segment. Therefore, separate Transmission and Distribution information is not disclosed for CL&P, NSTAR Electric, PSNH or WMECO. NU's operating segments and reporting units are consistent with its reportable business segments.

NSTAR amounts are not included in NU consolidated as of March 31, 2012, but are included as of March 31, 2013.

NU's segment information for the three month periods endedMarch 31, 2013 and 2012 is as follows:

		For the Three Months Ended March 31, 2013
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	1,374.2	$	361.8	$	239.5	$	217.2	$	(197.7)	$	1,995.0
Depreciation and Amortization			(177.0)		(17.4)		(31.8)		(19.0)		1.7		(243.5)
Other Operating Expenses			(1,004.9)		(267.2)		(62.2)		(197.4)		199.2		(1,332.5)
Operating Income			192.3		77.2		145.5		0.8		3.2		419.0
Interest Expense			(42.1)		(7.4)		(21.9)		(6.4)		1.5		(76.3)
Interest Income			1.0		-		0.1		1.6		(1.6)		1.1
Other Income, Net			3.8		0.2		2.7		320.3		(320.3)		6.7
Income Tax (Expense)/Benefit			(54.3)		(26.7)		(45.8)		6.5		(0.2)		(120.5)
Net Income			100.7		43.3		80.6		322.8		(317.4)		230.0
Net Income Attributable
	to Noncontrolling Interests		(1.2)		-		(0.7)		-		-		(1.9)
Net Income Attributable
	to Controlling Interest	$	99.5	$	43.3	$	79.9	$	322.8	$	(317.4)	$	228.1
Total Assets (as of)		$	18,208.2	$	2,735.4	$	6,269.1	$	18,749.8	$	(17,633.8)	$	28,328.7
Cash Flows Used for
	Investments in Plant	$	157.8	$	31.2	$	185.4	$	14.6	$	-	$	389.0

		For the Three Months Ended March 31, 2012
		Electric		Natural Gas
(Millions of Dollars)		Distribution		Distribution		Transmission		Other		Eliminations		Total
Operating Revenues		$	786.0	$	139.0	$	162.8	$	133.3	$	(121.5)	$	1,099.6
Depreciation and Amortization			(72.2)		(7.7)		(21.1)		(3.9)		0.3		(104.6)
Other Operating Expenses			(622.1)		(102.2)		(47.6)		(134.9)		126.2		(780.6)
Operating Income/(Loss)			91.7		29.1		94.1		(5.5)		5.0		214.4
Interest Expense			(33.0)		(5.4)		(19.7)		(9.4)		1.1		(66.4)
Interest Income			1.1		-		0.1		1.3		(1.3)		1.2
Other Income, Net			4.4		-		3.3		122.6		(122.7)		7.6
Income Tax (Expense)/Benefit			(21.4)		(9.0)		(30.8)		6.0		(0.8)		(56.0)
Net Income			42.8		14.7		47.0		115.0		(118.7)		100.8
Net Income Attributable
	to Noncontrolling Interests		(0.8)		-		(0.7)		-		-		(1.5)
Net Income Attributable
	to Controlling Interest	$	42.0	$	14.7	$	46.3	$	115.0	$	(118.7)	$	99.3
Total Assets (as of)		$	9,553.3	$	1,498.2	$	3,900.7	$	7,261.7	$	(6,235.5)	$	15,978.4
Cash Flows Used for
	Investments in Plant	$	130.7	$	20.5	$	135.9	$	17.2	$	-	$	304.3