10-Q

	UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
	FORM	10-Q
☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Quarterly Period Ended	September 30, 2021
	or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE      SECURITIES EXCHANGE ACT OF 1934
	For the transition period from ____________ to ____________

Registrant; State of Incorporation; Address; Telephone Number;

Commission File Number; and I.R.S. Employer Identification No.

EVERSOURCE ENERGY

(a Massachusetts voluntary association)

300 Cadwell Drive, Springfield, Massachusetts 01104

Telephone: (800) 286-5000

Commission File Number: 001-05324

I.R.S. Employer Identification No. 04-2147929

THE CONNECTICUT LIGHT AND POWER COMPANY

(a Connecticut corporation)

107 Selden Street, Berlin, Connecticut 06037-1616

Telephone: (800) 286-5000

Commission File Number: 000-00404

I.R.S. Employer Identification No. 06-0303850

NSTAR ELECTRIC COMPANY

(a Massachusetts corporation)

800 Boylston Street, Boston, Massachusetts 02199

Telephone: (800) 286-5000

Commission File Number: 001-02301

I.R.S. Employer Identification No. 04-1278810

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE

(a New Hampshire corporation)

Energy Park

780 North Commercial Street, Manchester, New Hampshire 03101-1134

Telephone: (800) 286-5000

Commission File Number: 001-06392

I.R.S. Employer Identification No. 02-0181050

Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Shares, $5.00 par value per share	ES	New York Stock Exchange

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
☒	☐

Indicate by check mark whether the registrants have submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrants were required to submit such files).

Yes	No
☒	☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Eversource Energy	Large accelerated filer	☒	Accelerated filer	☐	Non-accelerated filer	☐	Smaller reporting company	☐	Emerging growth company	☐
The Connecticut Light and Power Company	Large accelerated filer	☐	Accelerated filer	☐	Non-accelerated filer	☒	Smaller reporting company	☐	Emerging growth company	☐
NSTAR Electric Company	Large accelerated filer	☐	Accelerated filer	☐	Non-accelerated filer	☒	Smaller reporting company	☐	Emerging growth company	☐
Public Service Company of New Hampshire	Large accelerated filer	☐	Accelerated filer	☐	Non-accelerated filer	☒	Smaller reporting company	☐	Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

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

	Yes	No
Eversource Energy	☐	☒
The Connecticut Light and Power Company	☐	☒
NSTAR Electric Company	☐	☒
Public Service Company of New Hampshire	☐	☒

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.

Company - Class of Stock	Outstanding as of October 31, 2021
Eversource Energy Common Shares, $5.00 par value	343,805,812	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	200	shares
Public Service Company of New Hampshire Common Stock, $1.00 par value	301	shares

Eversource Energy holds all of the 6,035,205 shares, 200 shares, and 301 shares of the outstanding common stock of The Connecticut Light and Power Company, NSTAR Electric Company, and Public Service Company of New Hampshire, respectively.

NSTAR Electric Company and Public Service Company of New Hampshire 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.

Eversource Energy, The Connecticut Light and Power Company, NSTAR Electric Company, and Public Service Company of New Hampshire each separately file this combined Form 10-Q.  Information contained herein relating to any individual registrant is filed by such registrant on its own behalf.  Each registrant makes no representation as to information relating to the other registrants.

GLOSSARY OF TERMS

The following is a glossary of abbreviations and acronyms that are found in this report:

Current or former Eversource Energy companies, segments or investments:
Eversource, ES or the Company	Eversource Energy and subsidiaries
Eversource parent or ES parent	Eversource Energy, a public utility holding company
ES parent and other companies	ES parent and other companies are comprised of Eversource parent, Eversource Service, and other subsidiaries, which primarily includes our unregulated businesses, HWP Company, The Rocky River Realty Company (a real estate subsidiary), the consolidated operations of CYAPC and YAEC, and Eversource parent's equity ownership interests that are not consolidated
CL&P	The Connecticut Light and Power Company
NSTAR Electric	NSTAR Electric Company
PSNH	Public Service Company of New Hampshire
PSNH Funding	PSNH Funding LLC 3, a bankruptcy remote, special purpose, wholly-owned subsidiary of PSNH
NSTAR Gas	NSTAR Gas Company
EGMA	Eversource Gas Company of Massachusetts
Yankee Gas	Yankee Gas Services Company
Aquarion	Aquarion Company and its subsidiaries
NPT	Northern Pass Transmission LLC
Northern Pass	The high-voltage direct current (HVDC) and associated alternating-current transmission line project from Canada into New Hampshire
HEEC	Harbor Electric Energy Company, a wholly-owned subsidiary of NSTAR Electric
Eversource Service	Eversource Energy Service Company
Bay State Wind	Bay State Wind LLC, an offshore wind business being developed jointly by Eversource and Denmark-based Ørsted
North East Offshore	North East Offshore, LLC, an offshore wind business holding company being developed jointly by Eversource and Denmark-based Ørsted
CYAPC	Connecticut Yankee Atomic Power Company
MYAPC	Maine Yankee Atomic Power Company
YAEC	Yankee Atomic Electric Company
Yankee Companies	CYAPC, YAEC and MYAPC
Regulated companies	The Eversource regulated companies are comprised of the electric distribution and transmission businesses of CL&P, NSTAR Electric and PSNH, the natural gas distribution businesses of Yankee Gas, NSTAR Gas and EGMA, NPT, Aquarion, and the solar power facilities of NSTAR Electric
Regulators and Government Agencies:
BOEM	U.S. Bureau of Ocean Energy Management
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
Other Terms and Abbreviations:
ADIT	Accumulated Deferred Income Taxes
AFUDC	Allowance For Funds Used During Construction
AOCI	Accumulated Other Comprehensive Income
ARO	Asset Retirement Obligation
Bcf	Billion cubic feet
CfD	Contract for Differences
CTA	Competitive Transition Assessment
CWIP	Construction Work in Progress
EDC	Electric distribution company

i

EDIT	Excess Deferred Income Taxes
EPS	Earnings Per Share
ERISA	Employee Retirement Income Security Act of 1974
ESOP	Employee Stock Ownership Plan
Eversource 2020 Form 10-K	The Eversource Energy and Subsidiaries 2020 combined Annual Report on Form 10-K as filed with the SEC
Fitch	Fitch Ratings
FMCC	Federally Mandated Congestion Charge
GAAP	Accounting principles generally accepted in the United States of America
GSC	Generation Service Charge
GWh	Gigawatt-Hours
IPP	Independent Power Producers
ISO-NE Tariff	ISO-NE FERC Transmission, Markets and Services Tariff
kV	Kilovolt
kVa	Kilovolt-ampere
kW	Kilowatt (equal to one thousand watts)
LNG	Liquefied natural gas
LRS	Supplier of last resort service
MG	Million gallons
MGP	Manufactured Gas Plant
MMBtu	One million British thermal units
MMcf	Million cubic feet
Moody's	Moody's Investors Services, Inc.
MW	Megawatt
MWh	Megawatt-Hours
NETOs	New England Transmission Owners (including Eversource, National Grid and Avangrid)
OCI	Other Comprehensive Income/(Loss)
PAM	Pension and PBOP Rate Adjustment Mechanism
PBOP	Postretirement Benefits Other Than Pension
PBOP Plan	Postretirement Benefits Other Than Pension Plan
Pension Plan	Single uniform noncontributory defined benefit retirement plan
PPA	Power purchase agreement
RECs	Renewable Energy Certificates
Regulatory ROE	The average cost of capital method for calculating the return on equity related to the distribution business segment excluding the wholesale transmission segment
ROE	Return on Equity
RRBs	Rate Reduction Bonds or Rate Reduction Certificates
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 Plans and non-qualified defined benefit retirement plans
SS	Standard service
UI	The United Illuminating Company
VIE	Variable Interest Entity

ii

EVERSOURCE ENERGY AND SUBSIDIARIES   

THE CONNECTICUT LIGHT AND POWER COMPANY

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

TABLE OF CONTENTS

		Page
PART I – FINANCIAL INFORMATION
ITEM 1.	Financial Statements (Unaudited)
	Eversource Energy and Subsidiaries (Unaudited)
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Income	2
	Condensed Consolidated Statements of Comprehensive Income	2
	Condensed Consolidated Statements of Common Shareholders' Equity	3
	Condensed Consolidated Statements of Cash Flows	5
	The Connecticut Light and Power Company (Unaudited)
	Condensed Balance Sheets	6
	Condensed Statements of Income	7
	Condensed Statements of Comprehensive Income	7
	Condensed Statements of Common Stockholder's Equity	8
	Condensed Statements of Cash Flows	9
	NSTAR Electric Company and Subsidiary (Unaudited)
	Condensed Consolidated Balance Sheets	10
	Condensed Consolidated Statements of Income	11
	Condensed Consolidated Statements of Comprehensive Income	11
	Condensed Consolidated Statements of Common Stockholder's Equity	12
	Condensed Consolidated Statements of Cash Flows	13
	Public Service Company of New Hampshire and Subsidiaries (Unaudited)
	Condensed Consolidated Balance Sheets	14
	Condensed Consolidated Statements of Income	15
	Condensed Consolidated Statements of Comprehensive Income	15
	Condensed Consolidated Statements of Common Stockholder's Equity	16
	Condensed Consolidated Statements of Cash Flows	17
	Combined Notes to Condensed Financial Statements (Unaudited)	18
ITEM 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations
	Eversource Energy and Subsidiaries	42
	The Connecticut Light and Power Company, NSTAR Electric Company and Subsidiary, and Public Service Company of New Hampshire and Subsidiaries	61
ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	69
ITEM 4.	Controls and Procedures	69
PART II – OTHER INFORMATION
ITEM 1.	Legal Proceedings	70
ITEM 1A.	Risk Factors	70
ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	71
ITEM 6.	Exhibits	72
SIGNATURES		74

iii

EVERSOURCE ENERGY AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(Thousands of Dollars)	As of September 30, 2021		As of December 31, 2020
ASSETS
Current Assets:
Cash	$	88,204	$	106,599
Receivables, Net (net of allowance for uncollectible accounts of $441,723    and $358,851 as of September 30, 2021 and December 31, 2020, respectively)	1,288,758		1,195,925
Unbilled Revenues	176,325		233,025
Fuel, Materials, Supplies and REC Inventory	217,286		265,599
Regulatory Assets	1,016,304		1,076,556
Prepayments	177,869		105,620
Other Current Assets	108,807		146,819
Total Current Assets	3,073,553		3,130,143
Property, Plant and Equipment, Net	32,467,069		30,882,523
Deferred Debits and Other Assets:
Regulatory Assets	5,458,928		5,493,330
Goodwill	4,453,618		4,445,988
Investments in Unconsolidated Affiliates	1,356,313		1,107,143
Marketable Securities	466,628		456,617
Other Long-Term Assets	737,946		583,854
Total Deferred Debits and Other Assets	12,473,433		12,086,932
Total Assets	$	48,014,055	$	46,099,598
LIABILITIES AND CAPITALIZATION
Current Liabilities:
Notes Payable	$	711,000	$	1,249,325
Long-Term Debt – Current Portion	798,880		1,053,186
Rate Reduction Bonds – Current Portion	43,210		43,210
Accounts Payable	1,289,225		1,370,647
Regulatory Liabilities	612,931		389,430
Other Current Liabilities	802,831		809,214
Total Current Liabilities	4,258,077		4,915,012
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,341,105		4,095,339
Regulatory Liabilities	3,907,582		3,850,781
Derivative Liabilities	256,569		294,535
Asset Retirement Obligations	505,005		499,713
Accrued Pension, SERP and PBOP	1,330,037		1,653,788
Other Long-Term Liabilities	974,497		948,506
Total Deferred Credits and Other Liabilities	11,314,795		11,342,662
Long-Term Debt	17,420,300		15,125,876
Rate Reduction Bonds	453,702		496,912
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570		155,570
Common Shareholders' Equity:
Common Shares	1,789,092		1,789,092
Capital Surplus, Paid In	8,050,872		8,015,663
Retained Earnings	4,906,151		4,613,201
Accumulated Other Comprehensive Loss	(71,865)		(76,411)
Treasury Stock	(262,639)		(277,979)
Common Shareholders' Equity	14,411,611		14,063,566
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$	48,014,055	$	46,099,598

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

1

EVERSOURCE ENERGY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars, Except Share Information)	2021		2020		2021		2020
Operating Revenues	$	2,432,794	$	2,343,642	$	7,381,172	$	6,670,497
Operating Expenses:
Purchased Power, Fuel and Transmission	880,639		806,254		2,529,217		2,312,957
Operations and Maintenance	389,065		332,031		1,265,754		1,006,148
Depreciation	276,846		244,453		822,197		721,179
Amortization	45,236		57,515		158,860		130,687
Energy Efficiency Programs	143,796		145,047		460,814		408,794
Taxes Other Than Income Taxes	213,881		197,112		623,827		556,726
Total Operating Expenses	1,949,463		1,782,412		5,860,669		5,136,491
Operating Income	483,331		561,230		1,520,503		1,534,006
Interest Expense	147,962		134,066		431,162		403,067
Other Income, Net	43,768		29,218		124,588		83,565
Income Before Income Tax Expense	379,137		456,382		1,213,929		1,214,504
Income Tax Expense	94,091		108,242		294,461		275,621
Net Income	285,046		348,140		919,468		938,883
Net Income Attributable to Noncontrolling Interests	1,880		1,880		5,639		5,639
Net Income Attributable to Common Shareholders	$	283,166	$	346,260	$	913,829	$	933,244
Basic Earnings Per Common Share	$	0.82	$	1.01	$	2.66	$	2.77
Diluted Earnings Per Common Share	$	0.82	$	1.01	$	2.65	$	2.76
Weighted Average Common Shares Outstanding:
Basic	344,023,846		343,076,614		343,848,905		337,375,172
Diluted	344,669,782		343,773,602		344,480,056		338,424,100

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Net Income	$	285,046	$	348,140	$	919,468	$	938,883
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	115		602		967		1,218
Changes in Unrealized (Losses)/Gains on    Marketable Securities	(106)		(134)		(569)		295
Changes in Funded Status of Pension, SERP and    PBOP Benefit Plans	2,468		1,693		4,148		3,149
Other Comprehensive Income, Net of Tax	2,477		2,161		4,546		4,662
Comprehensive Income Attributable to    Noncontrolling Interests	(1,880)		(1,880)		(5,639)		(5,639)
Comprehensive Income Attributable to Common    Shareholders	$	285,643	$	348,421	$	918,375	$	937,906

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

2

EVERSOURCE ENERGY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY

(Unaudited)

	For the Nine Months Ended September 30, 2021
	Common Shares			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Loss		Treasury Stock		Total Common Shareholders' Equity
(Thousands of Dollars, Except Share Information)	Shares	Amount
Balance as of January 1, 2021	342,954,023	$	1,789,092	$	8,015,663	$	4,613,201	$	(76,411)	$	(277,979)	$	14,063,566
Net Income						368,023						368,023
Dividends on Common Shares - $0.6025 Per Share						(206,913)						(206,913)
Dividends on Preferred Stock						(1,880)						(1,880)
Long-Term Incentive Plan Activity				(15,727)								(15,727)
Issuance of Treasury Shares	480,275			16,182						8,981		25,163
Other Comprehensive Income								1,188				1,188
Balance as of March 31, 2021	343,434,298	1,789,092		8,016,118		4,772,431		(75,223)		(268,998)		14,233,420
Net Income						266,400						266,400
Dividends on Common Shares - $0.6025 Per Share						(206,893)						(206,893)
Dividends on Preferred Stock						(1,880)						(1,880)
Long-Term Incentive Plan Activity				6,162								6,162
Issuance of Treasury Shares	166,805			10,679						3,120		13,799
Other Comprehensive Income								881				881
Balance as of June 30, 2021	343,601,103	1,789,092		8,032,959		4,830,058		(74,342)		(265,878)		14,311,889
Net Income						285,046						285,046
Dividends on Common Shares - $0.6025 Per Share						(207,073)						(207,073)
Dividends on Preferred Stock						(1,880)						(1,880)
Long-Term Incentive Plan Activity				6,478								6,478
Issuance of Treasury Shares	173,221			11,435						3,239		14,674
Other Comprehensive Income								2,477				2,477
Balance as of September 30, 2021	343,774,324	$	1,789,092	$	8,050,872	$	4,906,151	$	(71,865)	$	(262,639)	$	14,411,611

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

3

EVERSOURCE ENERGY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY

(Unaudited)

	For the Nine Months Ended September 30, 2020
	Common Shares			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Loss		Treasury Stock		Total Common Shareholders' Equity
(Thousands of Dollars, Except Share Information)	Shares	Amount
Balance as of January 1, 2020	329,880,645	$	1,729,292	$	7,087,768	$	4,177,048	$	(65,059)	$	(299,055)	$	12,629,994
Net Income						336,633						336,633
Dividends on Common Shares - $0.5675 Per Share						(187,462)						(187,462)
Dividends on Preferred Stock						(1,880)						(1,880)
Issuance of Common Shares - $5 par value	5,960,000	29,800		402,300								432,100
Long-Term Incentive Plan Activity				(15,295)								(15,295)
Issuance of Treasury Shares	570,542			17,230						10,516		27,746
Capital Stock Expense				(12,314)								(12,314)
Adoption of Accounting Standards Update 2016-13						(1,514)						(1,514)
Other Comprehensive Income								1,948				1,948
Balance as of March 31, 2020	336,411,187	1,759,092		7,479,689		4,322,825		(63,111)		(288,539)		13,209,956
Net Income						254,112						254,112
Dividends on Common Shares - $0.5675 Per Share						(190,964)						(190,964)
Dividends on Preferred Stock						(1,880)						(1,880)
Issuance of Common Shares - $5 par value	6,000,000	30,000		487,560								517,560
Long-Term Incentive Plan Activity				7,694								7,694
Issuance of Treasury Shares	216,675			12,524						4,024		16,548
Capital Stock Expense				(8,321)								(8,321)
Other Comprehensive Income								553				553
Balance as of June 30, 2020	342,627,862	1,789,092		7,979,146		4,384,093		(62,558)		(284,515)		13,805,258
Net Income						348,140						348,140
Dividends on Common Shares - $0.5675 Per Share						(194,493)						(194,493)
Dividends on Preferred Stock						(1,880)						(1,880)
Long-Term Incentive Plan Activity				6,921								6,921
Issuance of Treasury Shares	169,611			10,909						3,001		13,910
Other Comprehensive Income								2,161				2,161
Balance as of September 30, 2020	342,797,473	$	1,789,092	$	7,996,976	$	4,535,860	$	(60,397)	$	(281,514)	$	13,980,017

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

4

EVERSOURCE ENERGY AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020
Operating Activities:
Net Income	$	919,468	$	938,883
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	822,197		721,179
Deferred Income Taxes	191,346		156,795
Uncollectible Expense	39,690		31,101
Pension, SERP and PBOP (Income)/Expense, Net	(10,882)		9,153
Pension and PBOP Contributions	(140,000)		(107,985)
Regulatory Over/(Under) Recoveries, Net	87,455		(29,287)
Charges at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	103,583		—
Amortization	158,860		130,687
Other	(229,878)		(69,216)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(158,205)		(193,895)
Fuel, Materials, Supplies and REC Inventory	48,312		21,102
Taxes Receivable/Accrued, Net	44,003		89,759
Accounts Payable	(258,509)		(121,034)
Other Current Assets and Liabilities, Net	(97,167)		(81,033)
Net Cash Flows Provided by Operating Activities	1,520,273		1,496,209
Investing Activities:
Investments in Property, Plant and Equipment	(2,211,136)		(2,101,564)
Proceeds from Sales of Marketable Securities	334,619		386,712
Purchases of Marketable Securities	(313,961)		(391,368)
Proceeds from the Sale of Hingham Water System	—		110,536
Investments in Unconsolidated Affiliates, Net	(245,245)		(31,677)
Other Investing Activities	17,436		17,647
Net Cash Flows Used in Investing Activities	(2,418,287)		(2,009,714)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	—		929,025
Cash Dividends on Common Shares	(603,611)		(555,655)
Cash Dividends on Preferred Stock	(5,639)		(5,639)
Decrease in Notes Payable	(458,325)		(1,174,870)
Repayment of Rate Reduction Bonds	(43,210)		(43,210)
Issuance of Long-Term Debt	3,150,000		2,360,000
Retirement of Long-Term Debt	(1,142,500)		(302,236)
Other Financing Activities	(45,522)		18,030
Net Cash Flows Provided by Financing Activities	851,193		1,225,445
Net (Decrease)/Increase in Cash and Restricted Cash	(46,821)		711,940
Cash and Restricted Cash - Beginning of Period	264,950		117,063
Cash and Restricted Cash - End of Period	$	218,129	$	829,003

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

5

THE CONNECTICUT LIGHT AND POWER COMPANY

CONDENSED BALANCE SHEETS

(Unaudited)

(Thousands of Dollars)	As of September 30, 2021		As of December 31, 2020
ASSETS
Current Assets:
Cash	$	62,791	$	90,801
Receivables, Net (net of allowance for uncollectible accounts of $195,463 and    $157,447 as of September 30, 2021 and December 31, 2020, respectively)	549,144		459,214
Accounts Receivable from Affiliated Companies	38,544		17,486
Unbilled Revenues	52,589		57,407
Materials and Supplies	54,894		57,924
Regulatory Assets	325,268		345,622
Prepaid Property Taxes	76,829		25,779
Prepayments and Other Current Assets	47,402		58,171
Total Current Assets	1,207,461		1,112,404
Property, Plant and Equipment, Net	10,598,836		10,234,556
Deferred Debits and Other Assets:
Regulatory Assets	1,981,805		1,866,152
Other Long-Term Assets	267,312		242,862
Total Deferred Debits and Other Assets	2,249,117		2,109,014
Total Assets	$	14,055,414	$	13,455,974
LIABILITIES AND CAPITALIZATION
Current Liabilities:
Accounts Payable	$	473,287	$	451,240
Accounts Payable to Affiliated Companies	98,298		51,118
Obligations to Third Party Suppliers	53,183		49,967
Regulatory Liabilities	311,269		137,166
Derivative Liabilities	72,249		68,767
Other Current Liabilities	168,547		102,060
Total Current Liabilities	1,176,833		860,318
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,495,407		1,408,343
Regulatory Liabilities	1,213,469		1,204,942
Derivative Liabilities	256,569		294,535
Accrued Pension, SERP and PBOP	313,206		478,325
Other Long-Term Liabilities	154,249		133,690
Total Deferred Credits and Other Liabilities	3,432,900		3,519,835
Long-Term Debt	4,215,096		3,914,835
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	2,810,765		2,810,765
Retained Earnings	2,243,004		2,173,367
Accumulated Other Comprehensive Income	264		302
Common Stockholder's Equity	5,114,385		5,044,786
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$	14,055,414	$	13,455,974

The accompanying notes are an integral part of these unaudited condensed financial statements.

6

THE CONNECTICUT LIGHT AND POWER COMPANY

CONDENSED STATEMENTS OF INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Operating Revenues	$	919,643	$	994,270	$	2,736,513	$	2,711,394
Operating Expenses:
Purchased Power and Transmission	392,301		399,117		1,073,712		1,089,232
Operations and Maintenance	137,816		147,487		465,630		417,717
Depreciation	85,304		80,583		253,132		238,735
Amortization of Regulatory Assets, Net	28,921		36,365		76,637		37,215
Energy Efficiency Programs	35,714		41,829		100,810		109,655
Taxes Other Than Income Taxes	99,901		97,715		275,178		260,571
Total Operating Expenses	779,957		803,096		2,245,099		2,153,125
Operating Income	139,686		191,174		491,414		558,269
Interest Expense	42,778		38,369		124,371		114,972
Other Income, Net	6,903		5,917		21,690		16,273
Income Before Income Tax Expense	103,811		158,722		388,733		459,570
Income Tax Expense	33,658		38,625		104,626		103,464
Net Income	$	70,153	$	120,097	$	284,107	$	356,106

The accompanying notes are an integral part of these unaudited condensed financial statements.

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Net Income	$	70,153	$	120,097	$	284,107	$	356,106
Other Comprehensive Loss, Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)		(7)		(20)		(20)
Changes in Unrealized (Losses)/Gains on    Marketable Securities	(2)		(4)		(18)		11
Other Comprehensive Loss, Net of Tax	(9)		(11)		(38)		(9)
Comprehensive Income	$	70,144	$	120,086	$	284,069	$	356,097

The accompanying notes are an integral part of these unaudited condensed financial statements.

7

THE CONNECTICUT LIGHT AND POWER COMPANY

CONDENSED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY

(Unaudited)

	For the Nine Months Ended September 30, 2021
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Income		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2021	6,035,205	$	60,352	$	2,810,765	$	2,173,367	$	302	$	5,044,786
Net Income						98,398				98,398
Dividends on Preferred Stock						(1,390)				(1,390)
Dividends on Common Stock						(70,100)				(70,100)
Other Comprehensive Loss								(32)		(32)
Balance as of March 31, 2021	6,035,205	60,352		2,810,765		2,200,275		270		5,071,662
Net Income						115,556				115,556
Dividends on Preferred Stock						(1,390)				(1,390)
Dividends on Common Stock						(70,100)				(70,100)
Other Comprehensive Income								3		3
Balance as of June 30, 2021	6,035,205	60,352		2,810,765		2,244,341		273		5,115,731
Net Income						70,153				70,153
Dividends on Preferred Stock						(1,390)				(1,390)
Dividends on Common Stock						(70,100)				(70,100)
Other Comprehensive Loss								(9)		(9)
Balance as of September 30, 2021	6,035,205	$	60,352	$	2,810,765	$	2,243,004	$	264	$	5,114,385

	For the Nine Months Ended September 30, 2020
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Income		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2020	6,035,205	$	60,352	$	2,535,765	$	1,791,392	$	316	$	4,387,825
Net Income						118,738				118,738
Dividends on Preferred Stock						(1,390)				(1,390)
Dividends on Common Stock						(69,500)				(69,500)
Adoption of Accounting Standards Update 2016-13						(900)				(900)
Other Comprehensive Loss								(1)		(1)
Balance as of March 31, 2020	6,035,205	60,352		2,535,765		1,838,340		315		4,434,772
Net Income						117,271				117,271
Dividends on Preferred Stock						(1,390)				(1,390)
Other Comprehensive Income								3		3
Balance as of June 30, 2020	6,035,205	60,352		2,535,765		1,954,221		318		4,550,656
Net Income						120,097				120,097
Dividends on Preferred Stock						(1,390)				(1,390)
Capital Contributions from Eversource Parent				125,000						125,000
Other Comprehensive Loss								(11)		(11)
Balance as of September 30, 2020	6,035,205	$	60,352	$	2,660,765	$	2,072,928	$	307	$	4,794,352

The accompanying notes are an integral part of these unaudited condensed financial statements.

8

THE CONNECTICUT LIGHT AND POWER COMPANY

CONDENSED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020
Operating Activities:
Net Income	$	284,107	$	356,106
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	253,132		238,735
Deferred Income Taxes	77,147		92,590
Uncollectible Expense	10,183		10,013
Pension, SERP, and PBOP Expense, Net	4,478		8,629
Pension Contributions	(78,913)		(23,200)
Regulatory Underrecoveries, Net	(19,404)		(32,051)
Charges related to PURA Settlement Agreement and Storm Performance Penalty	103,583		—
Amortization of Regulatory Assets, Net	76,637		37,215
Other	(74,179)		(63,525)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(165,423)		(153,464)
Taxes Receivable/Accrued, Net	45,762		(1,515)
Accounts Payable	(54,226)		(1,976)
Other Current Assets and Liabilities, Net	(12,315)		(68,316)
Net Cash Flows Provided by Operating Activities	450,569		399,241
Investing Activities:
Investments in Property, Plant and Equipment	(563,234)		(609,690)
Other Investing Activities	251		496
Net Cash Flows Used in Investing Activities	(562,983)		(609,194)
Financing Activities:
Cash Dividends on Common Stock	(210,300)		(69,500)
Cash Dividends on Preferred Stock	(4,169)		(4,169)
Capital Contributions from Eversource Parent	—		125,000
Issuance of Long-Term Debt	425,000		—
Retirement of Long-Term Debt	(120,500)		—
Increase in Notes Payable to Eversource Parent	—		172,100
Other Financing Activities	(5,664)		(1,214)
Net Cash Flows Provided by Financing Activities	84,367		222,217
Net (Decrease)/Increase in Cash and Restricted Cash	(28,047)		12,264
Cash and Restricted Cash - Beginning of Period	99,809		4,971
Cash and Restricted Cash - End of Period	$	71,762	$	17,235

The accompanying notes are an integral part of these unaudited condensed financial statements.

9

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(Thousands of Dollars)	As of September 30, 2021		As of December 31, 2020
ASSETS
Current Assets:
Cash	$	3,538	$	102
Receivables, Net (net of allowance for uncollectible accounts of $105,020 and    $91,583 as of September 30, 2021 and December 31, 2020, respectively)	489,503		403,045
Accounts Receivable from Affiliated Companies	27,417		30,095
Unbilled Revenues	47,844		38,342
Materials, Supplies and REC Inventory	83,667		133,894
Taxes Receivable	—		65,051
Regulatory Assets	388,408		399,882
Prepayments and Other Current Assets	22,490		21,833
Total Current Assets	1,062,867		1,092,244
Property, Plant and Equipment, Net	10,611,728		10,123,062
Deferred Debits and Other Assets:
Regulatory Assets	1,247,715		1,304,019
Prepaid PBOP	224,244		204,138
Other Long-Term Assets	185,555		162,836
Total Deferred Debits and Other Assets	1,657,514		1,670,993
Total Assets	$	13,332,109	$	12,886,299
LIABILITIES AND CAPITALIZATION
Current Liabilities:
Notes Payable	$	138,000	$	195,000
Notes Payable to Eversource Parent	24,600		21,300
Long-Term Debt – Current Portion	—		250,000
Accounts Payable	338,369		383,558
Accounts Payable to Affiliated Companies	78,974		95,703
Obligations to Third Party Suppliers	137,211		98,572
Renewable Portfolio Standards Compliance Obligations	72,124		127,536
Regulatory Liabilities	205,771		164,761
Other Current Liabilities	118,747		72,118
Total Current Liabilities	1,113,796		1,408,548
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,494,976		1,459,906
Regulatory Liabilities	1,561,572		1,550,390
Accrued Pension and SERP	110,752		172,571
Other Long-Term Liabilities	344,088		337,245
Total Deferred Credits and Other Liabilities	3,511,388		3,520,112
Long-Term Debt	3,984,724		3,393,221
Preferred Stock Not Subject to Mandatory Redemption	43,000		43,000
Common Stockholder's Equity:
Common Stock	—		—
Capital Surplus, Paid In	2,053,942		1,993,942
Retained Earnings	2,624,784		2,527,167
Accumulated Other Comprehensive Income	475		309
Common Stockholder's Equity	4,679,201		4,521,418
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$	13,332,109	$	12,886,299

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

10

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Operating Revenues	$	918,698	$	875,371	$	2,343,116	$	2,270,174
Operating Expenses:
Purchased Power and Transmission	294,052		267,375		711,667		702,117
Operations and Maintenance	142,074		131,143		421,649		369,293
Depreciation	84,820		80,366		251,530		238,232
Amortization of Regulatory Assets, Net	8,073		22,527		23,963		69,139
Energy Efficiency Programs	86,699		85,244		226,071		210,666
Taxes Other Than Income Taxes	54,723		54,680		163,501		153,985
Total Operating Expenses	670,441		641,335		1,798,381		1,743,432
Operating Income	248,257		234,036		544,735		526,742
Interest Expense	37,329		31,029		106,829		95,000
Other Income, Net	20,215		12,802		58,941		38,152
Income Before Income Tax Expense	231,143		215,809		496,847		469,894
Income Tax Expense	53,692		50,081		114,560		106,309
Net Income	$	177,451	$	165,728	$	382,287	$	363,585

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Net Income	$	177,451	$	165,728	$	382,287	$	363,585
Other Comprehensive (Loss)/Income, Net of Tax:
Changes in Funded Status of SERP Benefit Plan	(40)		(43)		(122)		(129)
Qualified Cash Flow Hedging Instruments	5		109		293		327
Changes in Unrealized (Losses)/Gains on      Marketable Securities	(1)		(1)		(5)		2
Other Comprehensive (Loss)/Income, Net of Tax	(36)		65		166		200
Comprehensive Income	$	177,415	$	165,793	$	382,453	$	363,785

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

11

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY

(Unaudited)

	For the Nine Months Ended September 30, 2021
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Income		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2021	200	$	—	$	1,993,942	$	2,527,167	$	309	$	4,521,418
Net Income						93,924				93,924
Dividends on Preferred Stock						(490)				(490)
Dividends on Common Stock						(206,400)				(206,400)
Other Comprehensive Income								61		61
Balance as of March 31, 2021	200	—		1,993,942		2,414,201		370		4,408,513
Net Income						110,912				110,912
Dividends on Preferred Stock						(490)				(490)
Dividends on Common Stock						(76,800)				(76,800)
Capital Contributions from Eversource Parent				60,000						60,000
Other Comprehensive Income								141		141
Balance as of June 30, 2021	200	—		2,053,942		2,447,823		511		4,502,276
Net Income						177,451				177,451
Dividends on Preferred Stock						(490)				(490)
Other Comprehensive Loss								(36)		(36)
Balance as of September 30, 2021	200	$	—	$	2,053,942	$	2,624,784	$	475	$	4,679,201

	For the Nine Months Ended September 30, 2020
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Income		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2020	200	$	—	$	1,813,442	$	2,346,287	$	155	$	4,159,884
Net Income						100,390				100,390
Dividends on Preferred Stock						(490)				(490)
Dividends on Common Stock						(196,500)				(196,500)
Adoption of Accounting Standards Update 2016-13						(161)				(161)
Other Comprehensive Income								67		67
Balance as of March 31, 2020	200	—		1,813,442		2,249,526		222		4,063,190
Net Income						97,468				97,468
Dividends on Preferred Stock						(490)				(490)
Other Comprehensive Income								68		68
Balance as of June 30, 2020	200	—		1,813,442		2,346,504		290		4,160,236
Net Income						165,728				165,728
Dividends on Preferred Stock						(490)				(490)
Other Comprehensive Income								65		65
Balance as of September 30, 2020	200	$	—	$	1,813,442	$	2,511,742	$	355	$	4,325,539

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

12

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020
Operating Activities:
Net Income	$	382,287	$	363,585
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	251,530		238,232
Deferred Income Taxes	12,905		13,436
Uncollectible Expense	12,477		11,321
Pension, SERP and PBOP Income, Net	(19,627)		(13,714)
Pension Contributions	(10,000)		(650)
Regulatory Over/(Under) Recoveries, Net	86,111		(20,047)
Amortization of Regulatory Assets, Net	23,963		69,139
Other	(71,005)		(25,508)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(110,336)		(104,528)
Materials, Supplies and REC Inventory	50,227		27,709
Taxes Receivable/Accrued, Net	109,561		55,405
Accounts Payable	(85,431)		(57,300)
Other Current Assets and Liabilities, Net	(15,322)		(54,481)
Net Cash Flows Provided by Operating Activities	617,340		502,599
Investing Activities:
Investments in Property, Plant and Equipment	(675,245)		(655,039)
Other Investing Activities	70		138
Net Cash Flows Used in Investing Activities	(675,175)		(654,901)
Financing Activities:
Cash Dividends on Common Stock	(283,200)		(196,500)
Cash Dividends on Preferred Stock	(1,470)		(1,470)
Issuance of Long-Term Debt	600,000		400,000
Retirement of Long-Term Debt	(250,000)		(95,000)
Capital Contributions from Eversource Parent	60,000		—
Increase in Notes Payable to Eversource Parent	3,300		6,300
(Decrease)/Increase in Notes Payable	(57,000)		50,000
Other Financing Activities	(10,367)		(4,931)
Net Cash Flows Provided by Financing Activities	61,263		158,399
Net Increase in Cash and Restricted Cash	3,428		6,097
Cash and Restricted Cash - Beginning of Period	17,410		6,312
Cash and Restricted Cash - End of Period	$	20,838	$	12,409

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)

(Thousands of Dollars)	As of September 30, 2021		As of December 31, 2020
ASSETS
Current Assets:
Cash	$	3,869	$	141
Receivables, Net (net of allowance for uncollectible accounts of $16,996 and $17,157    as of September 30, 2021 and December 31, 2020, respectively)	136,481		119,899
Accounts Receivable from Affiliated Companies	13,866		10,925
Unbilled Revenues	46,854		46,041
Materials, Supplies and REC Inventory	24,789		26,829
Regulatory Assets	97,948		115,852
Special Deposits	18,605		36,767
Prepaid Property Taxes	5,987		26,257
Prepayments and Other Current Assets	2,851		10,788
Total Current Assets	351,250		393,499
Property, Plant and Equipment, Net	3,529,050		3,374,270
Deferred Debits and Other Assets:
Regulatory Assets	829,848		873,203
Other Long-Term Assets	22,684		23,733
Total Deferred Debits and Other Assets	852,532		896,936
Total Assets	$	4,732,832	$	4,664,705
LIABILITIES AND CAPITALIZATION
Current Liabilities:
Notes Payable to Eversource Parent	$	66,500	$	46,300
Long-Term Debt – Current Portion	—		282,000
Rate Reduction Bonds – Current Portion	43,210		43,210
Accounts Payable	108,243		132,635
Accounts Payable to Affiliated Companies	25,055		43,397
Regulatory Liabilities	96,817		58,756
Other Current Liabilities	61,883		58,487
Total Current Liabilities	401,708		664,785
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	535,656		537,627
Regulatory Liabilities	389,426		383,183
Accrued Pension, SERP and PBOP	162,115		184,715
Other Long-Term Liabilities	35,564		37,874
Total Deferred Credits and Other Liabilities	1,122,761		1,143,399
Long-Term Debt	1,163,630		817,070
Rate Reduction Bonds	453,702		496,912
Common Stockholder's Equity:
Common Stock	—		—
Capital Surplus, Paid In	1,088,134		928,134
Retained Earnings	502,870		615,018
Accumulated Other Comprehensive Income/(Loss)	27		(613)
Common Stockholder's Equity	1,591,031		1,542,539
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$	4,732,832	$	4,664,705

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 September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Operating Revenues	$	314,893	$	283,669	$	887,177	$	815,261
Operating Expenses:
Purchased Power and Transmission	107,353		96,612		279,475		273,311
Operations and Maintenance	57,041		50,657		168,242		151,802
Depreciation	30,169		25,410		89,462		74,494
Amortization of Regulatory Assets, Net	17,922		7,360		62,744		39,034
Energy Efficiency Programs	10,762		11,081		30,475		29,231
Taxes Other Than Income Taxes	24,038		18,174		69,639		58,331
Total Operating Expenses	247,285		209,294		700,037		626,203
Operating Income	67,608		74,375		187,140		189,058
Interest Expense	14,321		14,942		42,774		44,029
Other Income, Net	3,171		4,065		11,598		10,882
Income Before Income Tax Expense	56,458		63,498		155,964		155,911
Income Tax Expense	12,315		16,347		32,512		37,527
Net Income	$	44,143	$	47,151	$	123,452	$	118,384

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020		2021		2020
Net Income	$	44,143	$	47,151	$	123,452	$	118,384
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	109		268		673		806
Changes in Unrealized (Losses)/Gains on    Marketable Securities	(6)		(8)		(33)		17
Other Comprehensive Income, Net of Tax	103		260		640		823
Comprehensive Income	$	44,246	$	47,411	$	124,092	$	119,207

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 COMMON STOCKHOLDER'S EQUITY

(Unaudited)

	For the Nine Months Ended September 30, 2021
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive (Loss)/Income		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2021	301	$	—	$	928,134	$	615,018	$	(613)	$	1,542,539
Net Income						44,676				44,676
Dividends on Common Stock						(25,200)				(25,200)
Other Comprehensive Income								255		255
Balance as of March 31, 2021	301	—		928,134		634,494		(358)		1,562,270
Net Income						34,633				34,633
Dividends on Common Stock						(185,200)				(185,200)
Capital Contributions from Eversource Parent				160,000						160,000
Other Comprehensive Income								282		282
Balance as of June 30, 2021	301	—		1,088,134		483,927		(76)		1,571,985
Net Income						44,143				44,143
Dividends on Common Stock						(25,200)				(25,200)
Other Comprehensive Income								103		103
Balance as of September 30, 2021	301	$	—	$	1,088,134	$	502,870	$	27	$	1,591,031

	For the Nine Months Ended September 30, 2020
	Common Stock			Capital Surplus, Paid In		Retained Earnings		Accumulated Other Comprehensive Loss		Total Common Stockholder's Equity
(Thousands of Dollars, Except Stock Information)	Stock	Amount
Balance as of January 1, 2020	301	$	—	$	903,134	$	490,306	$	(1,707)	$	1,391,733
Net Income						39,601				39,601
Dividends on Common Stock						(22,300)				(22,300)
Adoption of Accounting Standards Update 2016-13						(300)				(300)
Other Comprehensive Income								278		278
Balance as of March 31, 2020	301	—		903,134		507,307		(1,429)		1,409,012
Net Income						31,632				31,632
Other Comprehensive Income								285		285
Balance as of June 30, 2020	301	—		903,134		538,939		(1,144)		1,440,929
Net Income						47,151				47,151
Other Comprehensive Income								260		260
Balance as of September 30, 2020	301	$	—	$	903,134	$	586,090	$	(884)	$	1,488,340

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

16

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Nine Months Ended September 30,
(Thousands of Dollars)	2021		2020
Operating Activities:
Net Income	$	123,452	$	118,384
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	89,462		74,494
Deferred Income Taxes	(13,385)		13,959
Uncollectible Expense	4,381		2,058
Regulatory Over/(Under) Recoveries, Net	29,029		(22,203)
Amortization of Regulatory Assets, Net	62,744		39,034
Pension, SERP and PBOP Income, Net	(2,664)		(894)
Pension Contributions	—		(19,500)
Other	(22,738)		(7,545)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(25,607)		(24,562)
Materials, Supplies and REC Inventory	2,040		(301)
Taxes Receivable/Accrued, Net	22,286		1,313
Accounts Payable	(42,654)		(29,388)
Other Current Assets and Liabilities, Net	10,826		4,363
Net Cash Flows Provided by Operating Activities	237,172		149,212
Investing Activities:
Investments in Property, Plant and Equipment	(217,414)		(248,899)
Other Investing Activities	431		1,969
Net Cash Flows Used in Investing Activities	(216,983)		(246,930)
Financing Activities:
Cash Dividends on Common Stock	(235,600)		(22,300)
Capital Contributions from Eversource Parent	160,000		—
Issuance of Long-Term Debt	350,000		150,000
Retirement of Long-Term Debt	(282,000)		—
Repayment of Rate Reduction Bonds	(43,210)		(43,210)
Increase in Notes Payable to Eversource Parent	20,200		2,100
Other Financing Activities	(2,961)		(2,965)
Net Cash Flows (Used in)/Provided by Financing Activities	(33,571)		83,625
Net Decrease in Cash and Restricted Cash	(13,382)		(14,093)
Cash and Restricted Cash - Beginning of Period	39,555		36,688
Cash and Restricted Cash - End of Period	$	26,173	$	22,595

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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EVERSOURCE ENERGY AND SUBSIDIARIES

THE CONNECTICUT LIGHT AND POWER COMPANY

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

COMBINED NOTES TO CONDENSED 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 financial statements.

1.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A.    Basis of Presentation

Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business.  Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and Eversource Gas Company of Massachusetts (EGMA) (natural gas utilities) and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.3 million electric, natural gas and water customers through nine regulated utilities in Connecticut, Massachusetts and New Hampshire.

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

The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC.  Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations.  The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2020 Form 10-K, which was filed with the SEC on February 17, 2021. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.

The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of September 30, 2021 and December 31, 2020, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020. The results of operations and comprehensive income for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020 are not necessarily indicative of the results expected for a full year.  

Eversource's consolidated financial information includes the results of the acquisition of the assets of Columbia Gas of Massachusetts (CMA) on October 9, 2020. The natural gas distribution assets acquired from CMA on October 9, 2020 were assigned to EGMA.

Eversource consolidates the operations of CYAPC and YAEC, both of which are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent.  Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements.

Eversource holds several equity ownership interests that are not consolidated and are accounted for under the equity method.

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

COVID-19 has adversely affected customers, workers and the U.S. economy. We provide a critical service to our customers and have taken extensive measures to maintain its safety and reliability. We continue to address the impacts of the COVID-19 pandemic and how the related developments affect Eversource. We are in the re-entry phase of our pandemic response plan, in which the majority of our employees under remote work arrangements have transitioned back to the workplace. We have not experienced significant impacts directly related to the pandemic that have materially affected our current operations, our workforce, or results of operations. The extent of the impact to us in the future will vary, and depend on the duration, scope and severity of the pandemic and the resulting impact on economic, health care and capital market conditions. The future impact will also depend on the outcome of future proceedings before our state regulatory commissions to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses.

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Based on the status of our COVID-19 regulatory dockets, communications with our state regulatory commissions, and policies and practices in the jurisdictions in which we operate, we believe our state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses, while balancing the impact on our customers’ bills and our operating cash flows. See Note 1C, "Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts," for discussion of our evaluation of the allowance for doubtful accounts as of September 30, 2021 in light of the COVID-19 pandemic and Note 2, "Regulatory Accounting," for the amount of net incremental COVID-19 costs deferred on our balance sheets.

Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.

B.    Accounting Standards

Accounting Standards Recently Adopted: On January 1, 2021, the Company adopted Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes, which eliminates certain exceptions to the general principles of current income tax guidance in ASC 740 and simplifies and improves consistency in application of that income tax guidance through clarifications of and amendments to ASC 740. The ASU did not have a material impact on the financial statements of Eversource, CL&P, NSTAR Electric and PSNH.

C.    Allowance for Uncollectible Accounts

Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts).

Receivables are presented net of expected credit losses at estimated net realizable value by maintaining an allowance for uncollectible accounts. The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded.

The allowance for uncollectible accounts is determined based upon a variety of judgments and factors, including the application of an estimated uncollectible percentage to each receivable aging category.  Factors in determining credit loss include historical collection, write-off experience, and management's assessment of collectability from customers, including current conditions, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic indicators, collection efforts and other factors.  Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible.

As of September 30, 2021, management evaluated the adequacy of the allowance for uncollectible accounts in light of the COVID-19 pandemic and the related economic downturn. This evaluation included an analysis of collection and customer payment trends, economic conditions, delinquency statistics, aging-based quantitative assessments, the impact on residential customer bills because of energy usage and change in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, and COVID-19 developments, including any potential federal governmental pandemic relief programs and the expansion of unemployment benefit initiatives, which help to mitigate the potential for increasing customer account delinquencies. Additionally, management considered past economic declines and corresponding uncollectible reserves as part of the current assessment.

This evaluation has shown that our operating companies have experienced an increase in aged receivables and lower cash collections from customers because of the length of the moratorium on disconnections in Connecticut and Massachusetts, and the economic slowdown resulting from the COVID-19 pandemic. In Connecticut, the moratorium on disconnections of commercial and non-hardship residential customers ended in June 2021 and September 2021, respectively, but is still in place for hardship residential customers. In Massachusetts, the moratorium on disconnections of commercial customers and residential customers ended in September 2020 and July 2021, respectively. Disconnection activities have resumed after these moratoria have expired, which has resulted in recent improved collection experience and more customers applying for, and receiving, hardship status. On July 7, 2021, the NHPUC issued an order to New Hampshire utilities that concluded that recovery of incremental bad debt or waived late fees related to the COVID-19 pandemic would be addressed in a future rate case to the extent those costs are relevant at that time. As a result of the order, in the first nine months of 2021, PSNH removed its $0.6 million deferral of net incremental COVID-19 costs. In New Hampshire, the moratorium on disconnections of non-hardship residential and commercial customers ended in late 2020 and for hardship residential customers ended in May 2021 and PSNH has resumed disconnection activities, which has resulted in improved collection of outstanding customer receivable balances.

Based upon the evaluation performed, in the first nine months of 2021, management increased the allowance for uncollectible accounts for amounts incurred as a result of COVID-19 by $25.8 million for Eversource (increase of $16.3 million for CL&P and $12.5 million at our natural gas businesses, and decrease of $1.8 million at NSTAR Electric). In the third quarter of 2021, the COVID-19 related allowance for uncollectible accounts decreased by $6.5 million at Eversource (increased $4.0 million at CL&P, and decreased $8.3 million at NSTAR Electric and $2.2 million at our natural gas businesses). The COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs at our Connecticut and Massachusetts utilities or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. As of September 30, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $57.0 million at Eversource ($20.1 million at CL&P, $8.5 million at NSTAR Electric, and $27.4 million at our natural gas businesses).

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Management concluded that the reserve balance as of September 30, 2021 adequately reflected the collection risk and net realizable value for Eversource’s receivables. Management will continue to evaluate the adequacy of the uncollectible allowance in future reporting periods based on an ongoing assessment of accounts receivable collections, delinquency statistics, and analysis of aging-based quantitative assessments.

The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively.  The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance.

The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets. The activity in the allowance for uncollectible accounts by portfolio segment as of September 30th is as follows:

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2021
Beginning Balance	$	210.7	$	215.1	$	425.8	$	145.6	$	43.2	$	188.8	$	35.9	$	62.1	$	98.0	$	17.2
Uncollectible Expense	—		12.0		12.0		—		3.6		3.6		—		5.1		5.1		1.2
Uncollectible Costs Deferred (1)	22.8		1.7		24.5		4.5		5.7		10.2		11.8		(3.5)		8.3		1.2
Write-Offs	(3.9)		(20.5)		(24.4)		(3.5)		(5.4)		(8.9)		(0.1)		(7.4)		(7.5)		(2.8)
Recoveries Collected	0.3		3.5		3.8		0.2		1.6		1.8		—		1.1		1.1		0.2
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0
Nine Months Ended 2021
Beginning Balance	$	194.8	$	164.1	$	358.9	$	129.1	$	28.3	$	157.4	$	39.7	$	51.9	$	91.6	$	17.2
Uncollectible Expense	—		39.7		39.7		—		10.2		10.2		—		12.5		12.5		4.4
Uncollectible Costs Deferred (1)	44.8		53.3		98.1		25.7		21.4		47.1		8.3		11.8		20.1		2.0
Write-Offs	(10.6)		(55.2)		(65.8)		(8.7)		(14.8)		(23.5)		(0.4)		(22.6)		(23.0)		(7.3)
Recoveries Collected	0.9		9.9		10.8		0.7		3.6		4.3		—		3.8		3.8		0.7
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2020
Beginning Balance	$	175.5	$	94.5	$	270.0	$	116.3	$	20.4	$	136.7	$	34.6	$	34.1	$	68.7	$	11.8
Uncollectible Expense	—		10.5		10.5		—		3.8		3.8		—		4.5		4.5		0.8
Uncollectible Costs Deferred (1)	10.1		20.4		30.5		11.2		4.9		16.1		(1.3)		10.4		9.1		3.2
Write-Offs	(7.3)		(11.8)		(19.1)		(2.6)		(4.6)		(7.2)		(0.2)		(6.3)		(6.5)		(2.0)
Recoveries Collected	0.4		2.7		3.1		0.3		1.1		1.4		—		1.0		1.0		0.2
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0
Nine Months Ended 2020
Beginning Balance	$	143.3	$	81.5	$	224.8	$	80.1	$	17.2	$	97.3	$	43.9	$	31.5	$	75.4	$	10.5
ASU 2016-13 Implementation   Impact on January 1, 2020	21.6		2.2		23.8		21.3		0.9		22.2		(1.6)		0.3		(1.3)		0.3
Uncollectible Expense	—		31.1		31.1		—		10.0		10.0		—		11.3		11.3		2.1
Uncollectible Costs Deferred (1)	24.9		41.5		66.4		32.7		8.3		41.0		(8.4)		17.3		8.9		5.6
Write-Offs	(12.3)		(49.3)		(61.6)		(10.0)		(14.0)		(24.0)		(0.8)		(20.5)		(21.3)		(5.0)
Recoveries Collected	1.2		9.3		10.5		1.1		3.2		4.3		—		3.8		3.8		0.5
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0

(1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to COVID-19 and uncollectible energy supply costs.

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D.    Fair Value Measurements

Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to the marketable securities held in trusts.  Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, and AROs, and in the valuation of the acquisition of CMA's assets in 2020. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs.

Fair Value Hierarchy:  In measuring fair value, Eversource uses observable market data when available in order to minimize 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.  Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The 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.  

Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy.

Determination of Fair Value:  The valuation techniques and inputs used in Eversource'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 financial statements.

E.    Other Income, Net

The components of Other Income, Net on the statements of income were as follows:

	For the Three Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	21.7	$	4.2	$	10.1	$	2.5	$	11.0	$	0.9	$	7.2	$	1.8
AFUDC Equity	10.3		1.7		6.2		0.3		10.3		3.5		5.5		0.9
Equity in Earnings of Unconsolidated Affiliates (1)	4.9		—		0.1		—		3.9		—		0.1		—
Investment (Loss)/Income	(0.6)		(0.3)		(0.2)		(0.1)		1.0		1.3		(0.2)		0.2
Interest Income	7.3		1.3		3.9		0.4		1.5		0.2		0.1		1.2
Gain on Sale of Property	—		—		—		—		1.5		—		—		—
Other	0.2		—		0.1		0.1		—		—		0.1		—
Total Other Income, Net	$	43.8	$	6.9	$	20.2	$	3.2	$	29.2	$	5.9	$	12.8	$	4.1
	For the Nine Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	63.9	$	11.2	$	30.3	$	7.9	$	34.3	$	3.0	$	22.2	$	5.2
AFUDC Equity	28.7		5.1		18.6		1.2		31.8		11.4		15.8		3.5
Equity in Earnings of Unconsolidated Affiliates (1)	13.3		—		0.3		—		13.8		—		0.4		—
Investment Income/(Loss)	0.7		1.2		0.6		0.3		(1.5)		—		(1.5)		0.1
Interest Income	17.2		4.1		8.8		2.0		3.3		1.8		0.7		2.0
Gain on Sale of Property	0.1		—		—		0.1		1.8		—		0.3		—
Other	0.7		0.1		0.3		0.1		0.1		0.1		0.3		0.1
Total Other Income, Net	$	124.6	$	21.7	$	58.9	$	11.6	$	83.6	$	16.3	$	38.2	$	10.9

(1)    Equity in earnings of unconsolidated affiliates includes $2.1 million of pre-tax unrealized gains associated with an investment in a renewable energy fund for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, equity in earnings of unconsolidated affiliates included $2.4 million of primarily realized gains associated with this investment.

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F.    Other Taxes

Eversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:

	For the Three Months Ended				For the Nine Months Ended
(Millions of Dollars)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Eversource	$	49.4	$	48.4	$	137.9	$	129.1
CL&P	46.1		45.6		120.7		114.2

As agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income. 

G.    Supplemental Cash Flow Information

Non-cash investing activities include plant additions included in Accounts Payable as follows:

(Millions of Dollars)	As of September 30, 2021		As of September 30, 2020
Eversource	$	359.6	$	357.4
CL&P	75.3		97.8
NSTAR Electric	94.2		92.6
PSNH	32.8		50.0

The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Cash as reported on the Balance Sheets	$	88.2	$	62.8	$	3.5	$	3.9	$	106.6	$	90.8	$	0.1	$	0.1
Restricted cash included in:
Special Deposits	55.5		8.7		17.2		18.6		73.6		8.7		17.2		36.8
Marketable Securities	29.7		0.3		0.1		0.5		41.2		0.3		0.1		0.6
Other Long-Term Assets	44.7		—		—		3.2		43.6		—		—		2.1
Cash and Restricted Cash as reported on the     Statements of Cash Flows	$	218.1	$	71.8	$	20.8	$	26.2	$	265.0	$	99.8	$	17.4	$	39.6

Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, and CYAPC and YAEC cash balances. Special Deposits are included in Current Assets on the balance sheets. Restricted cash included in Marketable Securities represents money market funds held in trusts to fund certain non-qualified executive benefits and restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations. Restricted cash included in Other Long-Term Assets includes $41.5 million related to an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley, and an additional energy efficiency program established under the terms of the EGMA settlement agreement.

2.    REGULATORY ACCOUNTING

Eversource's utility companies are subject to rate regulation that is based on cost recovery and meets the criteria for application of accounting guidance for rate-regulated operations, which considers the effect of regulation on the timing of the recognition of certain revenues and expenses. The regulated companies' financial statements reflect the effects of the rate-making process.  The rates charged to the customers of Eversource's regulated companies are designed to collect each company's costs to provide service, plus a return on investment.

The application of accounting guidance for rate-regulated enterprises results in recording regulatory assets and liabilities. Regulatory assets represent the deferral of incurred costs that are probable of future recovery in customer rates. Regulatory assets are amortized as the incurred costs are recovered through customer rates. Regulatory liabilities represent either revenues received from customers to fund expected costs that have not yet been incurred or probable future refunds to customers.

Management believes it is probable that each of the regulated companies will recover its respective investments in long-lived assets and the regulatory assets that have been recorded.  If management were to determine that it could no longer apply the accounting guidance applicable to rate-regulated enterprises, or if management could not conclude it is probable that costs would be recovered from customers in future rates, the applicable costs would be charged to net income in the period in which the determination is made.

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

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Benefit Costs	$	2,566.1	$	540.2	$	638.4	$	249.7	$	2,794.2	$	632.3	$	690.0	$	267.6
Income Taxes, Net	756.4		458.1		113.8		18.7		747.1		458.9		110.4		15.2
Securitized Stranded Costs	489.7		—		—		489.7		522.1		—		—		522.1
Storm Restoration Costs, Net	944.2		674.2		198.1		71.9		765.6		515.1		186.4		64.1
Regulatory Tracker Mechanisms	883.0		304.6		320.0		76.8		850.5		246.6		332.2		95.3
Derivative Liabilities	265.3		265.3		—		—		296.3		293.1		—		—
Goodwill-related	302.0		—		259.3		—		314.7		—		270.2		—
Asset Retirement Obligations	121.6		33.7		57.8		4.0		118.4		32.1		58.6		3.9
Other Regulatory Assets	146.9		31.0		48.7		16.9		161.0		33.7		56.1		20.9
Total Regulatory Assets	6,475.2		2,307.1		1,636.1		927.7		6,569.9		2,211.8		1,703.9		989.1
Less:  Current Portion	1,016.3		325.3		388.4		97.9		1,076.6		345.6		399.9		115.9
Total Long-Term Regulatory Assets	$	5,458.9	$	1,981.8	$	1,247.7	$	829.8	$	5,493.3	$	1,866.2	$	1,304.0	$	873.2

CL&P Deferred Storm Costs: In 2021 and 2020, multiple tropical and severe storms caused extensive damage to CL&P’s electric distribution systems and customer outages, along with significant pre-staging costs. These storms resulted in deferred pre-staging and storm restoration costs of $195 million for 2021 storms and $344 million for 2020 storms, including the catastrophic impact of Tropical Storm Isaias in August 2020, among others. Management believes all these storm costs were prudently incurred and meet the criteria for specific cost recovery.

Regulatory Costs in Long-Term Assets:  Eversource's regulated companies had $260.6 million (including $111.2 million for CL&P, $85.1 million for NSTAR Electric and $3.2 million for PSNH) and $196.9 million (including $84.1 million for CL&P, $69.8 million for NSTAR Electric and $4.3 million for PSNH) of additional regulatory costs as of September 30, 2021 and December 31, 2020, respectively, that were included in long-term assets on the balance sheets.  These amounts represent incurred costs for which recovery has not yet been specifically approved by the applicable regulatory agency.  However, based on regulatory policies or past precedent on similar costs, management believes it is probable that these costs will ultimately be approved and recovered from customers in rates.

As of September 30, 2021 and December 31, 2020, these regulatory costs included net incremental COVID-19 related costs deferred of $41.3 million and $24.0 million at Eversource, respectively, of which, $34.5 million and $15.8 million, respectively, related to non-tracked uncollectible expense and the remainder related to facilities and fleet cleaning, sanitizing costs and supplies for personal protective equipment. Net incremental COVID-19 related costs deferred at CL&P and NSTAR Electric totaled $15.9 million and $10.9 million, respectively, as of September 30, 2021, and $4.7 million and $11.9 million, respectively, as of December 31, 2020, and primarily related to deferred non-tracked uncollectible expense.

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

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,737.1	$	1,001.5	$	1,025.6	$	363.9	$	2,778.6	$	1,010.7	$	1,044.0	$	371.5
Cost of Removal	676.7		117.0		384.1		19.0		624.8		98.4		363.6		12.9
Benefit Costs	65.9		—		56.5		—		83.6		—		72.5		—
Regulatory Tracker Mechanisms	484.5		208.9		180.6		87.5		366.5		148.9		139.7		47.8
AFUDC - Transmission	79.6		43.6		36.0		—		76.8		44.6		32.2		—
CL&P Settlement Agreement and Storm   Performance Penalty	103.4		103.4		—		—		—		—		—		—
Other Regulatory Liabilities	373.3		50.4		84.6		15.8		309.9		39.5		63.2		9.8
Total Regulatory Liabilities	4,520.5		1,524.8		1,767.4		486.2		4,240.2		1,342.1		1,715.2		442.0
Less:  Current Portion	612.9		311.3		205.8		96.8		389.4		137.2		164.8		58.8
Total Long-Term Regulatory Liabilities	$	3,907.6	$	1,213.5	$	1,561.6	$	389.4	$	3,850.8	$	1,204.9	$	1,550.4	$	383.2

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Recent Regulatory Developments:

CL&P Tropical Storm Isaias Costs: On August 4, 2020, Tropical Storm Isaias caused catastrophic damage to our electric distribution system, which resulted in significant numbers and durations of customer outages, primarily in Connecticut. In terms of customer outages, this storm was one of the worst in CL&P’s history. PURA will investigate the prudence of costs incurred by CL&P to restore service in response to Tropical Storm Isaias. That investigation is expected to occur either in a separate proceeding not yet initiated or as part of CL&P’s next rate review proceeding. Tropical Storm Isaias resulted in deferred storm restoration costs of approximately $234 million at CL&P and $251 million at Eversource as of September 30, 2021. The estimated cost of restoration may continue to change as additional cost information becomes available and final post-storm costs are deferred or capitalized. Although PURA found that CL&P’s performance in its preparation for and response to Tropical Storm Isaias fell below applicable performance standards in certain instances, CL&P believes it will be able to present credible evidence in a future proceeding demonstrating there is no reasonably close causal connection between the alleged sub-standard performance and the storm costs incurred. While it is possible that some amount of storm costs may be disallowed by PURA in a future proceeding, any such amount cannot be estimated at this time. Eversource and CL&P continue to believe that these storm restoration costs associated with Tropical Storm Isaias were prudently incurred and meet the criteria for cost recovery; and as a result, management does not expect the storm cost review by PURA to have a material impact on the financial position or results of operations of Eversource or CL&P.

CL&P Tropical Storm Isaias Response Investigation: On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. The $28.4 million performance penalty assessed by PURA was recorded within current regulatory liabilities on CL&P’s balance sheet. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. In the third quarter of 2021, CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

3.    PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize property, plant and equipment by asset category:

Eversource	As of September 30, 2021		As of December 31, 2020
(Millions of Dollars)
Distribution - Electric	$	17,257.3	$	16,703.2
Distribution - Natural Gas	6,334.9		6,111.2
Transmission - Electric	12,396.2		11,954.0
Distribution - Water	1,771.1		1,743.1
Solar	200.4		201.5
Utility	37,959.9		36,713.0
Other (1)	1,430.5		1,269.0
Property, Plant and Equipment, Gross	39,390.4		37,982.0
Less:  Accumulated Depreciation
Utility	(8,830.2)		(8,476.3)
Other	(550.0)		(477.6)
Total Accumulated Depreciation	(9,380.2)		(8,953.9)
Property, Plant and Equipment, Net	30,010.2		29,028.1
Construction Work in Progress	2,456.9		1,854.4
Total Property, Plant and Equipment, Net	$	32,467.1	$	30,882.5

	As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	7,028.9	$	7,798.8	$	2,469.9	$	6,820.7	$	7,544.4	$	2,378.4
Transmission - Electric	5,707.9		4,884.0		1,805.9		5,512.0		4,701.3		1,742.4
Solar	—		200.4		—		—		201.5		—
Property, Plant and Equipment, Gross	12,736.8		12,883.2		4,275.8		12,332.7		12,447.2		4,120.8
Less:  Accumulated Depreciation	(2,574.6)		(3,220.7)		(895.4)		(2,475.4)		(3,074.1)		(848.9)
Property, Plant and Equipment, Net	10,162.2		9,662.5		3,380.4		9,857.3		9,373.1		3,271.9
Construction Work in Progress	436.6		949.2		148.7		377.3		750.0		102.4
Total Property, Plant and Equipment, Net	$	10,598.8	$	10,611.7	$	3,529.1	$	10,234.6	$	10,123.1	$	3,374.3

(1)    These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

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4.    DERIVATIVE INSTRUMENTS

The electric and natural gas companies purchase and procure energy and energy-related products, which are subject to price volatility, for their customers.  The costs associated with supplying energy to customers are recoverable from customers in future rates.  These regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative and non-derivative contracts.  

Many of the derivative contracts meet the definition of, and are designated as, normal and qualify for accrual accounting under the applicable accounting guidance.  The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses on the statements of income, as applicable, as electricity or natural gas is delivered.

Derivative contracts that are not designated as normal are recorded at fair value as current or long-term Derivative Assets or Derivative Liabilities on the balance sheets.  For the electric and natural gas companies, regulatory assets or regulatory liabilities are recorded to offset the fair values of derivatives, as contract settlement amounts are recovered from, or refunded to, customers in their respective energy supply rates.  

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, on the balance sheets.  The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities:

		As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative		Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative
Current Derivative Assets:
CL&P	Level 3	$	14.4	$	(0.4)	$	14.0	$	13.7	$	(0.4)	$	13.3
Long-Term Derivative Assets:
CL&P	Level 3	51.1		(1.6)		49.5		58.7		(1.8)		56.9
Current Derivative Liabilities:
CL&P	Level 3	(72.2)		—		(72.2)		(68.8)		—		(68.8)
Other	Level 2	—		—		—		(3.3)		0.1		(3.2)
Long-Term Derivative Liabilities:
CL&P	Level 3	(256.6)		—		(256.6)		(294.5)		—		(294.5)

    

(1)    Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.

Derivative Contracts at Fair Value with Offsetting Regulatory Amounts

Commodity Supply and Price Risk Management:  As required by regulation, CL&P, along with UI, has capacity-related contracts with generation facilities.  CL&P has a sharing agreement with UI, with 80 percent of the costs or benefits of each contract borne by or allocated to CL&P and 20 percent borne by or allocated to UI.  The combined capacities of these contracts as of both September 30, 2021 and December 31, 2020 were 675 MW. The capacity contracts extend through 2026 and obligate both CL&P and UI 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 capacity market price received in the ISO-NE capacity markets. 

As of December 31, 2020, Eversource had New York Mercantile Exchange (NYMEX) financial contracts for natural gas futures in order to reduce variability associated with the price of 8.9 million MMBtu of natural gas. These contracts were classified as Level 2 in the fair value hierarchy. NSTAR Gas terminated its financial contracts swap program in April 2021.

For the three months ended September 30, 2021 and 2020, there were gains of $0.7 million and losses of $2.6 million, respectively, deferred as regulatory costs, which reflect the change in fair value associated with Eversource's derivative contracts. For the nine months ended September 30, 2021 and 2020, there were losses of $9.5 million and $20.6 million, respectively.

Fair Value Measurements of Derivative Instruments

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 valuations adjusted for assumptions related 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 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 in order to address the full term of the contract.  

Valuations of derivative contracts using a 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.  

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The following is a summary of Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:

	As of September 30, 2021								As of December 31, 2020
CL&P	Range				Weighted Average (1)			Period Covered	Range				Weighted Average (1)			Period Covered
Capacity Prices	$2.61				$	2.61	per kW-Month	2025 - 2026	$	4.30	—	$5.30	$	4.63	per kW-Month	2024 - 2026
Forward Reserve Prices	$	0.50	—	$1.15	$	0.82	per kW-Month	2022 - 2024	$	0.54	—	$0.90	$	0.72	per kW-Month	2021 - 2024

(1)    Unobservable inputs were weighted by the relative future capacity and forward reserve prices and contractual MWs over the periods covered.

Exit price premiums of 5.5 percent through 9.8 percent, or a weighted average of 8.7 percent, are also applied to these contracts and reflect the uncertainty and illiquidity premiums that would be required based on the most recent market activity available for similar type contracts. The risk premium was weighted by the relative fair value of the net derivative instruments.

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

The following table presents changes 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.

CL&P	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Millions of Dollars)	2021		2020		2021		2020
Derivatives, Net:
Fair Value as of Beginning of Period	$	(279.7)	$	(322.0)	$	(293.1)	$	(329.2)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets	0.7		(4.7)		(10.9)		(22.3)
Settlements	13.7		14.9		38.7		39.7
Fair Value as of End of Period	$	(265.3)	$	(311.8)	$	(265.3)	$	(311.8)

5.    MARKETABLE SECURITIES

Eversource holds marketable securities that are primarily used to fund certain non-qualified executive benefits.  The trusts that hold marketable securities are not subject to regulatory oversight by state or federal agencies.  CYAPC and YAEC maintain legally restricted trusts, each of which holds marketable securities, to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities.

Equity Securities: Unrealized gains and losses on equity securities held in Eversource's non-qualified executive benefit trust are recorded in Other Income, Net on the statements of income. The fair value of these equity securities as of September 30, 2021 and December 31, 2020 was $39.2 million and $40.9 million, respectively.  For the three months ended September 30, 2021 and 2020, there were unrealized losses of $0.5 million and unrealized gains of $1.6 million, respectively, recorded in Other Income, Net related to these equity securities. For the nine months ended September 30, 2021 and 2020, there were unrealized gains of $2.5 million and unrealized losses of $1.0 million, respectively.

Eversource's equity securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $214.9 million and $205.1 million as of September 30, 2021 and December 31, 2020, respectively.  Unrealized gains and losses for these spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to Other Long-Term Liabilities on the balance sheets, with no impact on the statements of income.

Available-for-Sale Debt Securities: The following is a summary of the available-for-sale debt securities, which are recorded at fair value and are included in current and long-term Marketable Securities on the balance sheets.

	As of September 30, 2021								As of December 31, 2020
Eversource (Millions of Dollars)	Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value		Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value
Debt Securities	$	217.5	$	8.0	$	(0.2)	$	225.3	$	213.1	$	11.2	$	(0.1)	$	224.2

Eversource's debt securities include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts in the amounts of $195.2 million and $192.5 million as of September 30, 2021 and December 31, 2020, respectively.

Unrealized gains and losses on available-for-sale debt securities held in Eversource's non-qualified benefit trust are recorded in Accumulated Other Comprehensive Income, excluding amounts related to credit losses or losses on securities intended to be sold, which are recorded in Other Income, Net. There have been no significant unrealized losses and no credit losses for the three and nine months ended September 30, 2021 and 2020, and no allowance for credit losses as of September 30, 2021. Factors considered in determining whether a credit loss exists include adverse conditions specifically affecting the issuer, the payment history, ratings and rating changes of the security, and the severity of the impairment.  For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated. Debt securities included in Eversource's non-qualified benefit trust portfolio are investment-grade bonds with a lower default risk based on their credit quality.

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As of September 30, 2021, the contractual maturities of available-for-sale debt securities were as follows:

 

Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year (1)	$	30.9	$	30.9
One to five years	65.5		67.1
Six to ten years	41.8		43.9
Greater than ten years	79.3		83.4
Total Debt Securities	$	217.5	$	225.3

(1)    Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.

Realized Gains and Losses:  Realized gains and losses are recorded in Other Income, Net for Eversource's benefit trust and are offset in Other Long-Term Liabilities for CYAPC and YAEC.  Eversource utilizes the specific identification basis method for the Eversource non-qualified benefit trust, and the average cost basis method for the CYAPC and YAEC spent nuclear fuel trusts to compute the realized gains and losses on the sale of marketable securities.

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:

Eversource (Millions of Dollars)	As of September 30, 2021		As of December 31, 2020
Level 1:
Mutual Funds and Equities	$	254.1	$	246.0
Money Market Funds	29.7		41.2
Total Level 1	$	283.8	$	287.2
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	98.9	$	72.9
Corporate Debt Securities	63.4		63.8
Asset-Backed Debt Securities	13.4		11.9
Municipal Bonds	6.1		24.0
Other Fixed Income Securities	13.8		10.4
Total Level 2	$	195.6	$	183.0
Total Marketable Securities	$	479.4	$	470.2

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 instruments 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

Short-Term Debt - Commercial Paper Programs and Credit Agreements: Eversource parent has a $2.00 billion commercial paper program allowing Eversource parent to issue commercial paper as a form of short-term debt. Eversource parent, CL&P, PSNH, NSTAR Gas, Yankee Gas, EGMA and Aquarion Water Company of Connecticut are parties to a five-year $2.00 billion revolving credit facility, which terminates on October 15, 2026. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program.  

NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility, which terminates on October 15, 2026. The revolving credit facility serves to backstop NSTAR Electric's $650 million commercial paper program.  

The amount of borrowings outstanding and available under the commercial paper programs were as follows:

	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	653.0	$	1,054.3	$	1,347.0	$	945.7	0.18	%	0.25	%
NSTAR Electric Commercial Paper Program	138.0		195.0		512.0		455.0		0.10	%	0.16	%

There were no borrowings outstanding on the revolving credit facilities as of September 30, 2021 or December 31, 2020.

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CL&P and PSNH have uncommitted line of credit agreements totaling $450 million and $300 million, respectively, which will expire on May 12, 2022. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of September 30, 2021.

Amounts outstanding under the commercial paper programs are included in Notes Payable and classified in current liabilities on the Eversource and NSTAR Electric balance sheets, as all borrowings are outstanding for no more than 364 days at one time. As a result of the NSTAR Gas long-term debt issuances in October 2021, $80.0 million of commercial paper borrowings under the Eversource parent commercial paper program were classified as Long-Term Debt as of September 30, 2021.

The Company expects the future operating cash flows of Eversource, CL&P, NSTAR Electric and PSNH, along with existing borrowing availability and access to both debt and equity markets, will be sufficient to meet any working capital and future operating requirements, and capital investment forecasted opportunities.

Intercompany Borrowings: Eversource parent uses its available capital resources to provide loans to its subsidiaries to assist in meeting their short-term borrowing needs. Eversource parent records intercompany interest income from its loans to subsidiaries, which is eliminated in consolidation. Intercompany loans from Eversource parent to its subsidiaries are eliminated in consolidation on Eversource's balance sheets. As of September 30, 2021, there were intercompany loans from Eversource parent to PSNH of $66.5 million, and to a subsidiary of NSTAR Electric of $24.6 million. As of December 31, 2020, there were intercompany loans from Eversource parent to PSNH of $46.3 million, and to a subsidiary of NSTAR Electric of $21.3 million. Intercompany loans from Eversource parent are included in Notes Payable to Eversource Parent and classified in current liabilities on the respective subsidiary's balance sheets.

Availability under Long-Term Debt Issuance Authorizations: On March 31, 2021, the DPU approved NSTAR Electric's request for authorization to issue up to $1.60 billion in long-term debt through December 31, 2023. On September 10, 2021, the DPU approved EGMA’s request for authorization to issue up to $725 million in long-term debt through December 31, 2023. The remaining Eversource operating companies, including CL&P and PSNH, have utilized the long-term debt authorizations in place with the respective regulatory commissions.

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Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments:

(Millions of Dollars)	Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
CL&P:
2.05% Series A First Mortgage Bonds	$	425.0	June 2021	July 2031	Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB	(120.5)		September 2021	September 2028	Paid on par call date in advance of maturity
NSTAR Electric:
3.10% 2021 Debentures	300.0		May 2021	June 2051	Refinanced investments in eligible green expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes	(250.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
1.95% 2021 Debentures	300.0		August 2021	August 2031	Repaid short-term debt, paid capital expenditures and working capital
PSNH:
4.05% Series Q First Mortgage Bonds	(122.0)		March 2021	June 2021	Paid on par call date in advance of maturity date
3.20% Series R First Mortgage Bonds	(160.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
2.20% Series V First Mortgage Bonds	350.0		June 2021	June 2031	Repaid short-term debt, including short-term debt used to redeem Series R First Mortgage Bonds, paid capital expenditures and working capital
Other:
Eversource Parent 2.50% Series I Senior Notes	(450.0)		February 2021	March 2021	Paid on par call date in advance of maturity date
Eversource Parent 2.55% Series S Senior Notes	350.0		March 2021	March 2031	Repaid short-term debt, including short-term debt used to redeem Series I Senior Notes
Eversource Parent 1.40% Series U Senior Notes	300.0		August 2021	August 2026	Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1)	350.0		August 2021	August 2023	Repaid short-term debt
Aquarion Water Company of Connecticut 3.31%    Senior Notes	100.0		April 2021	April 2051	Repaid 5.50% Notes, repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut 5.50% Notes	(40.0)		April 2021	April 2021	Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds	90.0		August 2021	August 2026	(2)
Yankee Gas 2.88% Series T First Mortgage Bonds	35.0		August 2021	August 2051	(2)
EGMA 2.11% Series A First Mortgage Bonds	310.0		September 2021	October 2031	(2)
EGMA 2.92% Series B First Mortgage Bonds	240.0		September 2021	October 2051	(2)
NSTAR Gas 2.25% Series T First Mortgage Bonds	40.0		October 2021	November 2031	(2)
NSTAR Gas 3.03% Series U First Mortgage Bonds	40.0		October 2021	November 2051	(2)

(1)    On August 10, 2021, Eversource Parent issued $350 million of floating rate Series T Senior Notes with a maturity date of August 15, 2023. The notes have a coupon rate based on the Compounded SOFR plus 0.25%.

(2)    The use of proceeds from these various issuances refinanced existing indebtedness, funded capital expenditures and were for general corporate purposes. The EGMA indebtedness that was refinanced included $309.4 million of long-term debt.

7.    RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

Rate Reduction Bonds: In May 2018, PSNH Funding, a wholly-owned subsidiary of PSNH, issued $635.7 million of securitized RRBs in multiple tranches with a weighted average interest rate of 3.66 percent, and final maturity dates ranging from 2026 to 2035.  The RRBs are expected to be repaid by February 1, 2033. RRB payments consist of principal and interest and are paid semi-annually, beginning on February 1, 2019. The RRBs were issued pursuant to a finance order issued by the NHPUC in January 2018 to recover remaining costs resulting from the divestiture of PSNH’s generation assets.

PSNH Funding was formed solely to issue RRBs to finance PSNH's unrecovered remaining costs associated with the divestiture of its generation assets. PSNH Funding is considered a VIE primarily because the equity capitalization is insufficient to support its operations. PSNH has the power to direct the significant activities of the VIE and is most closely associated with the VIE as compared to other interest holders. Therefore, PSNH is considered the primary beneficiary and consolidates PSNH Funding in its consolidated financial statements.

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The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements:

(Millions of Dollars)
PSNH Balance Sheets:	As of September 30, 2021		As of December 31, 2020
Restricted Cash - Current Portion (included in Current Assets)	$	18.3	$	36.8
Restricted Cash - Long-Term Portion (included in Other Long-Term Assets)	3.2		2.1
Securitized Stranded Cost (included in Regulatory Assets)	489.7		522.1
Other Regulatory Liabilities (included in Regulatory Liabilities)	8.0		9.1
Accrued Interest (included in Other Current Liabilities)	3.0		8.0
Rate Reduction Bonds - Current Portion	43.2		43.2
Rate Reduction Bonds - Long-Term Portion	453.7		496.9

(Millions of Dollars) PSNH Income Statements:	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	$	10.8	$	10.8	$	32.4	$	32.4
Interest Expense on RRB Principal (included in Interest Expense)	4.5		4.9		13.9		14.9

8.    PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees.  In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements.

The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets for future recovery, are shown below.  The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis.

	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2021								For the Three Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	21.5	$	5.6	$	4.0	$	2.2	$	3.3	$	0.5	$	0.6	$	0.3
Interest Cost	32.5		6.7		6.7		3.7		4.3		0.8		1.1		0.4
Expected Return on Plan Assets	(109.5)		(21.7)		(27.1)		(11.9)		(19.8)		(2.5)		(9.2)		(1.6)
Actuarial Loss	60.7		10.8		15.3		5.3		2.0		0.4		0.5		0.1
Prior Service Cost/(Credit)	0.3		—		0.1		—		(5.3)		0.3		(4.3)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	5.5	$	1.4	$	(1.0)	$	(0.7)	$	(15.5)	$	(0.5)	$	(11.3)	$	(0.7)
Intercompany Expense/(Income) Allocations	N/A		$	2.2	$	2.4	$	0.7	N/A		$	(0.4)	$	(0.5)	$	(0.2)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	64.3	$	17.4	$	11.9	$	6.6	$	10.1	$	1.7	$	1.8	$	0.9
Interest Cost	97.5		20.7		20.1		10.9		12.9		2.4		3.3		1.3
Expected Return on Plan Assets	(328.0)		(65.0)		(81.1)		(35.6)		(59.3)		(7.7)		(27.7)		(4.6)
Actuarial Loss	183.1		34.6		46.1		15.4		5.9		1.2		1.6		0.4
Prior Service Cost/(Credit)	1.1		—		0.3		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	18.0	$	7.7	$	(2.7)	$	(2.7)	$	(46.3)	$	(1.6)	$	(33.7)	$	(1.7)
Intercompany Expense/(Income) Allocations	N/A		$	5.8	$	6.4	$	1.9	N/A		$	(1.3)	$	(1.5)	$	(0.5)

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	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2020								For the Three Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	18.7	$	5.4	$	3.8	$	2.0	$	2.4	$	0.4	$	0.5	$	0.2
Interest Cost	44.4		9.3		9.7		4.8		6.1		1.1		1.7		0.7
Expected Return on Plan Assets	(99.2)		(19.8)		(25.7)		(11.1)		(18.3)		(2.5)		(8.5)		(1.4)
Actuarial Loss	50.7		9.7		14.0		3.8		2.2		0.3		0.6		0.2
Prior Service Cost/(Credit)	0.2		—		—		—		(5.3)		0.3		(4.2)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	14.8	$	4.6	$	1.8	$	(0.5)	$	(12.9)	$	(0.4)	$	(9.9)	$	(0.2)
Intercompany Expense/(Income) Allocations	N/A		$	2.4	$	2.3	$	0.8	N/A		$	(0.3)	$	(0.4)	$	(0.1)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2020								For the Nine Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	57.0	$	16.5	$	11.4	$	6.2	$	7.3	$	1.3	$	1.6	$	0.6
Interest Cost	133.0		28.1		29.0		14.5		18.3		3.3		5.0		2.1
Expected Return on Plan Assets	(298.8)		(59.6)		(77.2)		(33.5)		(55.1)		(7.4)		(25.5)		(4.2)
Actuarial Loss	150.7		29.4		41.3		11.8		6.3		0.9		1.8		0.6
Prior Service Cost/(Credit)	0.8		—		0.2		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	42.7	$	14.4	$	4.7	$	(1.0)	$	(39.1)	$	(1.1)	$	(29.8)	$	(0.6)
Intercompany Expense/(Income) Allocations	N/A		$	6.7	$	6.5	$	2.2	N/A		$	(0.9)	$	(1.0)	$	(0.4)

Eversource Contributions: Eversource currently expects to make contributions of $180 million to the Pension Plans in 2021, of which $99 million and $30 million will be contributed by CL&P and NSTAR Electric, respectively.

9.    COMMITMENTS AND CONTINGENCIES

A.    Environmental Matters

Eversource, CL&P, NSTAR Electric and PSNH 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. Eversource, CL&P, NSTAR Electric and PSNH have an active environmental auditing and training program and each believes it is substantially in compliance with all enacted laws and regulations.

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

	As of September 30, 2021			As of December 31, 2020
	Number of Sites	Reserve (in millions)		Number of Sites	Reserve (in millions)
Eversource	62	$	111.9	63	$	102.4
CL&P	14	12.5		15	12.3
NSTAR Electric	12	3.7		12	4.7
PSNH	9	6.4		9	7.1

The increase in the reserve balance was due primarily to a change in cost estimates at an NSTAR Gas MGP site under investigation for which we now know of additional remediation that is required.

Included in the number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured natural 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, for which Eversource may have potential liability.  The reserve balances related to these former MGP sites were $102.4 million and $92.2 million as of September 30, 2021 and December 31, 2020, respectively, and related primarily to the natural gas business segment.

These reserve estimates are subjective in nature as they take into consideration several different remediation options at each specific site.  The reliability and precision of these estimates can be affected by several factors, including new information concerning either the level of contamination at the site, the extent of Eversource's, CL&P's, NSTAR Electric's and PSNH's responsibility for remediation or the extent of remediation required, recently enacted laws and regulations or changes in cost estimates due to certain economic factors.  It is possible that new information or future developments could require a reassessment of the potential exposure to required environmental remediation.  As this information becomes available, management will continue to assess the potential exposure and adjust the reserves accordingly.

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B.    Long-Term Contractual Arrangements

The following is an update to the current status of long-term contractual arrangements set forth in Note 13B of the Eversource 2020 Form 10-K.

Renewable Energy: Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities.

NSTAR Electric
(Millions of Dollars)	2021		2022		2023		2024		2025		Thereafter		Total
Renewable Energy	$	27.1	$	103.9	$	230.5	$	341.2	$	348.1	$	6,564.2	$	7,615.0

The table has been updated to include long-term commitments of NSTAR Electric pertaining to the Massachusetts Clean Energy 83D contract, for which construction commenced in 2021. Estimated costs under this contract are expected to begin in 2023 and range between $150 million and $415 million per year under a 20-year contract, totaling approximately $6.7 billion.

C.    Guarantees and Indemnifications

In the normal course of business, Eversource parent provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric and PSNH, in the form of guarantees. Management does not anticipate a material impact to net income or cash flows as a result of these various guarantees and indemnifications. 

Guarantees issued on behalf of unconsolidated entities, including equity method offshore wind investments, for which Eversource parent is the guarantor, are recorded at fair value as a liability on the balance sheet at the inception of the guarantee. Eversource regularly reviews performance risk under these guarantee arrangements, and in the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded. The fair value of guarantees issued on behalf of unconsolidated entities are recorded within Other Long-Term Liabilities on the balance sheet, and was $5.7 million as of September 30, 2021.

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties:  

As of September 30, 2021
Company (Obligor)	Description	Maximum Exposure (in millions)		Expiration Dates
North East Offshore LLC	Construction-related purchase agreements with third-party contractors (1)	$	1,093.5	(1)
Eversource Investment LLC	Funding and indemnification obligations of North East Offshore LLC (2)	—		(2)
Sunrise Wind LLC	OREC capacity production (3)	2.2		(3)
Sunrise Wind LLC	Construction-related purchase agreements with third-party contractors (4)	386.4		—
South Fork Wind, LLC	Transmission interconnection	1.2		—
South Fork Wind, LLC	Construction-related purchase agreements with third-party contractors (5)	40.6		2023
Bay State Wind LLC	Real estate purchase	2.5		2022
Various	Surety bonds (6)	67.5		2021 - 2023
Rocky River Realty Company and    Eversource Service	Lease payments for real estate	4.0		2024

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contactors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 2, below. The guarantee expires upon the full performance of the guaranteed obligations.    

(2)    Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the Amended and Restated Limited Liability Company Operating Agreement of NEO, in an aggregate amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations.

(3)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed on October 23, 2019, by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations.    

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(4)     Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $420.6 million, in connection with a construction-related purchase agreement. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) April 14, 2026 and (ii) full performance of the guaranteed obligations.

(5)    Eversource parent issued two guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with two construction-related purchase agreements. Under one guarantee, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $25.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 4, 2023 and (ii) full performance of the guaranteed obligations. Under the second guaranty, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $14.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 18, 2023 and (ii) full performance of the guaranteed obligations.

(6)    Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded. 

Letter of Credit: On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million.

D.     Spent Nuclear Fuel Obligations - Yankee Companies

CL&P, NSTAR Electric and PSNH have plant closure and fuel storage cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear power facilities and are now engaged in the long-term storage of their spent fuel. The Yankee Companies fund these costs through litigation proceeds received from the DOE and, to the extent necessary, through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric and PSNH. CL&P, NSTAR Electric and PSNH, in turn recover these costs from their customers through state regulatory commission-approved retail rates. The Yankee Companies collect amounts that management believes are adequate to recover the remaining plant closure and fuel storage cost estimates for the respective plants. Management believes CL&P and NSTAR Electric will recover their shares of these obligations from their customers. PSNH has recovered its total share of these costs from its customers.

Spent Nuclear Fuel Litigation:

The Yankee Companies have filed complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to accept delivery of, and provide for a permanent facility to store, spent nuclear fuel pursuant to the terms of the 1983 spent fuel and high-level waste disposal contracts between the Yankee Companies and the DOE. The court previously awarded the Yankee Companies damages for Phases I, II, III and IV of litigation resulting from the DOE's failure to meet its contractual obligations. These Phases covered damages incurred in the years 1998 through 2016, and the awarded damages have been received by the Yankee Companies with certain amounts of the damages refunded to their customers.

DOE Phase V Damages - On March 25, 2021, each of the Yankee Companies filed a fifth set of lawsuits against the DOE in the Court of Federal Claims. The Yankee Companies are calculating and will be seeking monetary damages for CYAPC, YAEC and MYAPC, resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal covering the years from 2017 to 2020 (DOE Phase V).

E.    FERC ROE Complaints

Four separate complaints were filed at the FERC by combinations of New England state attorneys general, state regulatory commissions, consumer advocates, consumer groups, municipal parties and other parties (collectively, the Complainants). In each of the first three complaints, filed on October 1, 2011, December 27, 2012, and July 31, 2014, respectively, the Complainants challenged the NETOs' base ROE of 11.14 percent that had been utilized since 2005 and sought an order to reduce it prospectively from the date of the final FERC order and for the separate 15-month complaint periods. In the fourth complaint, filed April 29, 2016, the Complainants challenged the NETOs' base ROE billed of 10.57 percent and the maximum ROE for transmission incentive (incentive cap) of 11.74 percent, asserting that these ROEs were unjust and unreasonable.

The ROE originally billed during the period October 1, 2011 (beginning of the first complaint period) through October 15, 2014 consisted of a base ROE of 11.14 percent and incentives up to 13.1 percent. On October 16, 2014, the FERC set the base ROE at 10.57 percent and the incentive cap at 11.74 percent for the first complaint period. This was also effective for all prospective billings to customers beginning October 16, 2014. This FERC order was vacated on April 14, 2017 by the U.S. Court of Appeals for the D.C. Circuit (the Court).

All amounts associated with the first complaint period have been refunded, which totaled $38.9 million (pre-tax and excluding interest) at Eversource and reflected both the base ROE and incentive cap prescribed by the FERC order. The refund consisted of $22.4 million for CL&P, $13.7 million for NSTAR Electric and $2.8 million for PSNH.

Eversource has recorded a reserve of $39.1 million (pre-tax and excluding interest) for the second complaint period as of September 30, 2021 and December 31, 2020. This reserve represents the difference between the billed rates during the second complaint period and a 10.57 percent base ROE and 11.74 percent incentive cap. The reserve consisted of $21.4 million for CL&P, $14.6 million for NSTAR Electric and $3.1 million for PSNH as of September 30, 2021 and December 31, 2020.

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On October 16, 2018, FERC issued an order on all four complaints describing how it intends to address the issues that were remanded by the Court. FERC proposed a new framework to determine (1) whether an existing ROE is unjust and unreasonable and, if so, (2) how to calculate a replacement ROE. Initial briefs were filed by the NETOs, Complainants and FERC Trial Staff on January 11, 2019 and reply briefs were filed on March 8, 2019. The NETOs' brief was supportive of the overall ROE methodology determined in the October 16, 2018 order provided the FERC does not change the proposed methodology or alter its implementation in a manner that has a material impact on the results.

The FERC order included illustrative calculations for the first complaint using FERC's proposed frameworks with financial data from that complaint. Those illustrative calculations indicated that for the first complaint period, for the NETOs, which FERC concludes are of average financial risk, the preliminary just and reasonable base ROE is 10.41 percent and the preliminary incentive cap on total ROE is 13.08 percent.

If the results of the illustrative calculations were included in a final FERC order for each of the complaint periods, then a 10.41 percent base ROE and a 13.08 percent incentive cap would not have a significant impact on our financial statements for all of the complaint periods. These preliminary calculations are not binding and do not represent what we believe to be the most likely outcome of a final FERC order.

On November 21, 2019, FERC issued Opinion No. 569 affecting the two pending transmission ROE complaints against the Midcontinent ISO (MISO) transmission owners, in which FERC adopted a new methodology for determining base ROEs. Various parties sought rehearing. On December 23, 2019, the NETOs filed supplementary materials in the NETOs' four pending cases to respond to this new methodology because of the uncertainty of the applicability to the NETOs’ cases.

On May 21, 2020, the FERC issued its order in Opinion No. 569-A on the rehearing of the MISO transmission owners' cases, in which FERC again changed its methodology for determining the MISO transmission owners' base ROEs. Various parties appealed the MISO transmission owners' opinion. On November 19, 2020, the FERC issued Opinion No. 569-B denying rehearing of Opinion No. 569-A and reaffirmed the methodology previously adopted in Opinion No. 569-A. The new methodology differs significantly from the methodology proposed by FERC in its October 16, 2018 order to determine the NETOs' base ROEs in its four pending cases.

Given the significant uncertainty regarding the applicability of the FERC opinions in the MISO transmission owners' two complaint cases to the NETOs' pending four complaint cases, Eversource concluded that there is no reasonable basis for a change to the reserve or recognized ROEs for any of the complaint periods at this time. As well, Eversource cannot reasonably estimate a range of any gain or loss for any of the four complaint proceedings at this time.

Eversource, CL&P, NSTAR Electric and PSNH currently record revenues at the 10.57 percent base ROE and incentive cap at 11.74 percent established in the October 16, 2014 FERC order.

A change of 10 basis points to the base ROE used to establish the reserves would impact Eversource's after-tax earnings by an average of approximately $3 million for each of the four 15-month complaint periods.

F.    Eversource and NSTAR Electric Boston Harbor Civil Action

In 2016, the United States Attorney on behalf of the United States Army Corps of Engineers filed a civil action in the United States District Court for the District of Massachusetts against NSTAR Electric, HEEC, and the Massachusetts Water Resources Authority (together with NSTAR Electric and HEEC, the "Defendants").  The action alleged that the Defendants failed to comply with certain permitting requirements related to the placement of the HEEC-owned electric distribution cable beneath Boston Harbor.

The parties reached a settlement pursuant to which HEEC agreed to install a new 115kV distribution cable across Boston Harbor to Deer Island, utilizing a different route, and remove portions of the existing cable. Construction of the new distribution cable was completed in August 2019, and removal of the portions of the existing cable was completed in January 2020. All issues surrounding the current permit from the United States Army Corps of Engineers are expected to be resolved, and subsequently, such litigation then dismissed with prejudice.

G.    CL&P Regulatory Matters

CL&P Tropical Storm Isaias Response Investigation: In August 2020, PURA opened a docket to investigate the preparation for and response to Tropical Storm Isaias by Connecticut utilities, including CL&P. On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. Specifically, PURA concluded that CL&P did not satisfy the performance standards for managing its municipal liaison program, timely removing electrical hazards from blocked roads, communicating critical information to its customers, or meeting its obligation to secure adequate external contractor and mutual aid resources in a timely manner. Based on its findings, PURA ordered CL&P to adjust its future rates in a pending or future rate proceeding to reflect a monetary penalty in the form of a downward adjustment of 90 basis points in its allowed rate of return on equity (ROE), which is currently 9.25 percent. In its decision, PURA explained that additional monetary penalties and further enforcement orders pursuant to Connecticut statute would be considered in a separate proceeding that was initiated on May 6, 2021.

On May 6, 2021, as part of the penalty proceeding, PURA issued a notice of violation that included an assessment of $30 million, consisting of a $28.4 million civil penalty for non-compliance with storm performance standards to be provided as credits on customer bills and a $1.6 million fine for violations of accident reporting requirements to be paid to the State of Connecticut’s general fund. On July 14, 2021, PURA issued a final decision in this penalty proceeding that included an assessment of $28.6 million, maintaining the $28.4 million performance penalty and reducing the $1.6 million fine for accident reporting to $0.2 million. The $28.4 million performance penalty is currently being credited to customers on electric bills beginning on September 1, 2021 over a one-year period. The $28.4 million is the maximum statutory penalty amount under applicable Connecticut law in effect at the time of Tropical Storm Isaias, which is 2.5 percent of CL&P’s annual distribution revenues. The

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liability for the performance penalty was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. The after-tax earnings impact of this charge was $0.07 per share.

CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. PURA approved the settlement agreement on October 27, 2021. In the settlement agreement, CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. CL&P also agreed to irrevocably set aside $10 million to fund various customer assistance initiatives as directed by PURA for disbursement to state-designated purposes, with the objective of disbursing the funds prior to April 30, 2022, including providing credits to existing hardship and non-hardship customers carrying arrearages and other purposes. In the third quarter of 2021, CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues associated with the customer credits and a $10 million charge to Operations and Maintenance expense associated with the customer assistance initiatives on the three months ended September 30, 2021 income statement.

In exchange for the $75 million of customer credits and assistance, PURA’s interim rate reduction docket was resolved without findings. As a result of the settlement agreement, neither the 90 basis point reduction to CL&P’s return on equity introduced in PURA’s storm-related decision issued April 28, 2021, nor the 45 basis point reduction to CL&P’s return on equity included in PURA’s draft decision issued September 14, 2021 in the interim rate reduction docket, will be implemented.

CL&P has also agreed that its current base distribution rates shall be frozen, subject to the customer credits described above, until no earlier than January 1, 2024. The rate freeze applies only to base distribution rates (including storm costs) and not to other rate mechanisms such as the retail rate components, rate reconciling mechanisms, formula rates and any other adjustment mechanisms. The rate freeze also does not apply to any cost recovery mechanism outside of the base distribution rates with regard to grid-modernization initiatives or any other proceedings, either currently pending or that may be initiated during the rate freeze period, that may place additional obligations on CL&P. The approval of the settlement agreement satisfies the Connecticut statute of rate review requirements that requires electric utilities to file a distribution rate case within four years of the last rate case.

As part of the settlement agreement, CL&P agreed to withdraw with prejudice its pending appeals of PURA’s April 28, 2021 and July 14, 2021 decisions related to Storm Isaias and agreed to waive its right to file an appeal and seek a judicial stay of the final decision in the interim rate reduction docket. The settlement agreement assures that CL&P will have the opportunity to petition for and demonstrate the prudence of the storm costs incurred to respond to customer outages associated with Storm Isaias in a future ratemaking proceeding.

The cumulative pre-tax impact of the settlement agreement and the Storm Isaias assessment imposed in PURA’s April 28, 2021 and July 14, 2021 decisions totaled $103.6 million, and the after-tax earnings impact was $85.8 million, or $0.25 per share, for the nine months ended September 30, 2021.

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 long-term debt and RRB debt securities 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.  The fair values provided in the table below are classified as Level 2 within the fair value hierarchy.  Carrying amounts and estimated fair values are as follows:

	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of September 30, 2021:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	165.5	$	116.2	$	121.4	$	43.0	$	44.1	$	—	$	—
Long-Term Debt	18,219.2		19,810.9		4,215.1		4,865.2		3,984.7		4,494.3		1,163.6		1,228.9
Rate Reduction Bonds	496.9		555.8		—		—		—		—		496.9		555.8
As of December 31, 2020:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	169.1	$	116.2	$	123.4	$	43.0	$	45.7	$	—	$	—
Long-Term Debt	16,179.1		18,420.1		3,914.8		4,800.9		3,643.2		4,294.0		1,099.1		1,207.0
Rate Reduction Bonds	540.1		603.4		—		—		—		—		540.1		603.4

Derivative Instruments and Marketable Securities: Derivative instruments and investments in marketable securities are carried at fair value.  For further information, see Note 4, "Derivative Instruments," and Note 5, "Marketable Securities," to the financial statements.  

See Note 1D, "Summary of Significant Accounting Policies – Fair Value Measurements," for the fair value measurement policy and the fair value hierarchy.

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11.    ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

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

	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Marketable Securities		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Unrealized Gains on Marketable Securities		Defined Benefit Plans		Total
Balance as of Beginning of Period	$	(1.4)	$	1.1	$	(76.1)	$	(76.4)	$	(3.0)	$	0.7	$	(62.8)	$	(65.1)
OCI Before Reclassifications	—		(0.6)		(2.4)		(3.0)		—		0.3		(1.6)		(1.3)
Amounts Reclassified from AOCI	1.0		—		6.5		7.5		1.2		—		4.8		6.0
Net OCI	1.0		(0.6)		4.1		4.5		1.2		0.3		3.2		4.7
Balance as of End of Period	$	(0.4)	$	0.5	$	(72.0)	$	(71.9)	$	(1.8)	$	1.0	$	(59.6)	$	(60.4)

Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI.

12.    COMMON SHARES

The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values:  

	Shares
			Authorized as of September 30, 2021 and December 31, 2020	Issued as of
	Par Value			September 30, 2021	December 31, 2020
Eversource	$	5	380,000,000	357,818,402	357,818,402
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

Treasury Shares: As of September 30, 2021 and December 31, 2020, there were 14,044,078 and 14,864,379 Eversource common shares held as treasury shares, respectively. As of September 30, 2021 and December 31, 2020, Eversource common shares outstanding were 343,774,324 and 342,954,023, respectively.

Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares.

13.    COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

Dividends on the preferred stock of CL&P and NSTAR Electric totaled $1.9 million for each of the three months ended September 30, 2021 and 2020 and $5.6 million for each of the nine months ended September 30, 2021 and 2020. These dividends were presented as Net Income Attributable to Noncontrolling Interests on the Eversource statements of income. Noncontrolling Interest – Preferred Stock of Subsidiaries on the Eversource balance sheets totaled $155.6 million as of September 30, 2021 and December 31, 2020. On the Eversource balance sheets, Common Shareholders' Equity was fully attributable to Eversource parent and Noncontrolling Interest – Preferred Stock of Subsidiaries was fully attributable to the noncontrolling interest.

14.    EARNINGS PER SHARE

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 of certain share-based compensation awards as if they were converted into outstanding common shares.  The dilutive effect of unvested RSU and performance share awards is calculated using the treasury stock method.  RSU and performance share awards are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. There were no antidilutive share awards excluded from the computation of diluted EPS for the three and nine months ended September 30, 2021 and the three months ended September 30, 2020. For the nine months ended September 30, 2020, there were 52,747 antidilutive share awards excluded from the EPS computation, as their impact would have been antidilutive. Antidilutive shares pertained to a purchase option extended to underwriters in connection with Eversource’s common share issuance on June 15, 2020.

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

Eversource (Millions of Dollars, except share information)	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Net Income Attributable to Common Shareholders	$	283.2	$	346.3	$	913.8	$	933.2
Weighted Average Common Shares Outstanding:
Basic	344,023,846		343,076,614		343,848,905		337,375,172
Dilutive Effect of:
Share-Based Compensation Awards and Other	645,936		696,988		631,151		686,403
Equity Forward Sale Agreement	—		—		—		362,525
Total Dilutive Effect	645,936		696,988		631,151		1,048,928
Diluted	344,669,782		343,773,602		344,480,056		338,424,100
Basic EPS	$	0.82	$	1.01	$	2.66	$	2.77
Diluted EPS	$	0.82	$	1.01	$	2.65	$	2.76

15.    REVENUES

The following tables present operating revenues disaggregated by revenue source:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,146.8	$	81.7	$	—	$	39.1	$	—	$	—	$	1,267.6
Commercial	748.8		59.0		—		17.2		—		(1.4)		823.6
Industrial	96.2		28.6		—		1.1		—		(4.8)		121.1
Total Retail Tariff Sales Revenues	1,991.8		169.3		—		57.4		—		(6.2)		2,212.3
Wholesale Transmission Revenues	—		—		527.2		—		23.0		(408.5)		141.7
Wholesale Market Sales Revenues	133.8		12.2		—		1.1		—		—		147.1
Other Revenues from Contracts with Customers	29.6		1.2		3.5		1.8		303.1		(301.4)		37.8
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(0.9)		—		—		(94.3)
Total Revenues from Contracts with Customers	2,061.8		182.7		530.7		59.4		326.1		(716.1)		2,444.6
Alternative Revenue Programs	(7.9)		2.7		(112.6)		2.3		—		102.0		(13.5)
Other Revenues (2)	1.3		0.1		0.2		0.1		—		—		1.7
Total Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,094.9	$	722.8	$	—	$	102.8	$	—	$	—	$	3,920.5
Commercial	1,902.9		356.4		—		47.0		—		(4.1)		2,302.2
Industrial	261.1		119.5		—		3.3		—		(12.8)		371.1
Total Retail Tariff Sales Revenues	5,258.9		1,198.7		—		153.1		—		(16.9)		6,593.8
Wholesale Transmission Revenues	—		—		1,338.4		—		62.5		(1,075.4)		325.5
Wholesale Market Sales Revenues	380.1		54.1		—		3.0		—		—		437.2
Other Revenues from Contracts with Customers	68.4		3.6		10.2		5.5		936.6		(929.6)		94.7
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(2.2)		—		—		(95.6)
Total Revenues from Contracts with Customers	5,614.0		1,256.4		1,348.6		159.4		999.1		(2,021.9)		7,355.6
Alternative Revenue Programs	14.9		21.3		(119.2)		1.3		—		103.0		21.3
Other Revenues (2)	3.2		0.1		0.7		0.3		—		—		4.3
Total Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2

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	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,183.9	$	45.5	$	—	$	45.8	$	—	$	—	$	1,275.2
Commercial	682.7		41.1		—		17.1		—		(1.4)		739.5
Industrial	91.0		17.5		—		1.3		—		(3.6)		106.2
Total Retail Tariff Sales Revenues	1,957.6		104.1		—		64.2		—		(5.0)		2,120.9
Wholesale Transmission Revenues	—		—		458.2		—		19.0		(365.6)		111.6
Wholesale Market Sales Revenues	79.6		8.7		—		1.1		—		—		89.4
Other Revenues from Contracts with Customers	20.7		1.3		3.2		0.7		303.3		(299.0)		30.2
Total Revenues from Contracts with Customers	2,057.9		114.1		461.4		66.0		322.3		(669.6)		2,352.1
Alternative Revenue Programs	1.7		(4.0)		(72.3)		(2.0)		—		67.0		(9.6)
Other Revenues (2)	0.7		0.1		0.2		0.1		—		—		1.1
Total Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,063.7	$	399.6	$	—	$	113.2	$	—	$	—	$	3,576.5
Commercial	1,815.7		243.5		—		47.7		—		(3.7)		2,103.2
Industrial	248.4		67.0		—		3.6		—		(10.1)		308.9
Total Retail Tariff Sales Revenues	5,127.8		710.1		—		164.5		—		(13.8)		5,988.6
Wholesale Transmission Revenues	—		—		1,177.9		—		55.6		(981.4)		252.1
Wholesale Market Sales Revenues	231.1		31.9		—		2.9		—		—		265.9
Other Revenues from Contracts with Customers	63.3		4.1		9.9		2.8		845.1		(838.0)		87.2
Total Revenues from Contracts with Customers	5,422.2		746.1		1,187.8		170.2		900.7		(1,833.2)		6,593.8
Alternative Revenue Programs	54.8		22.9		(52.7)		(4.1)		—		48.9		69.8
Other Revenues (2)	4.9		1.0		0.5		0.5		—		—		6.9
Total Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5

	For the Three Months Ended September 30, 2021						For the Three Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	572.0	$	401.9	$	172.9	$	608.7	$	415.4	$	159.8
Commercial	249.4		411.3		88.5		244.7		358.3		80.1
Industrial	35.0		35.9		25.3		38.0		30.6		22.4
Total Retail Tariff Sales Revenues	856.4		849.1		286.7		891.4		804.3		262.3
Wholesale Transmission Revenues	268.2		171.0		88.0		233.3		153.1		71.8
Wholesale Market Sales Revenues	100.3		21.3		12.2		60.0		12.1		7.5
Other Revenues from Contracts with Customers	12.1		14.3		7.3		8.1		10.5		3.7
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		2.3
Total Revenues from Contracts with Customers	1,143.6		1,055.7		394.2		1,192.8		980.0		347.6
Alternative Revenue Programs	(82.0)		(14.4)		(24.1)		(65.0)		8.2		(13.8)
Other Revenues (2)	0.2		0.7		0.6		0.2		0.7		—
Eliminations	(142.2)		(123.3)		(55.8)		(133.7)		(113.5)		(50.1)
Total Operating Revenues	$	919.6	$	918.7	$	314.9	$	994.3	$	875.4	$	283.7

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	For the Nine Months Ended September 30, 2021						For the Nine Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,558.6	$	1,069.0	$	467.3	$	1,567.9	$	1,057.9	$	437.9
Commercial	679.3		975.7		249.2		670.4		921.3		225.3
Industrial	100.2		89.5		71.4		105.3		82.1		61.0
Total Retail Tariff Sales Revenues	2,338.1		2,134.2		787.9		2,343.6		2,061.3		724.2
Wholesale Transmission Revenues	652.8		478.2		207.4		576.5		430.3		171.1
Wholesale Market Sales Revenues	278.1		64.7		37.3		163.9		39.8		27.4
Other Revenues from Contracts with Customers	28.8		36.8		14.9		25.1		32.4		10.9
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		6.9
Total Revenues from Contracts with Customers	3,204.4		2,713.9		1,047.5		3,109.1		2,563.8		940.5
Alternative Revenue Programs	(74.2)		(11.3)		(18.8)		(27.8)		31.1		(1.2)
Other Revenues (2)	0.3		2.5		1.1		2.0		2.8		0.6
Eliminations	(394.0)		(362.0)		(142.6)		(371.9)		(327.5)		(124.6)
Total Operating Revenues	$	2,736.5	$	2,343.1	$	887.2	$	2,711.4	$	2,270.2	$	815.3

(1)    The Electric Distribution segment 2021 revenue subject to refund amount relates to an October 1, 2021 CL&P settlement agreement with the DEEP, OCC, AG and the Connecticut Industrial Energy Consumers, which resolved certain issues that arose in pending regulatory proceedings initiated by the PURA. In the third quarter of 2021, CL&P recorded a reduction to Operating Revenues of $65 million on the income statement for a reserve for customer credits associated with the provisions of the settlement agreement. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards to be credited to customers. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. In total, the reserve for revenues subject to refund totaled $93.4 million and was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

(2)    Other Revenues include certain fees charged to customers that are not considered revenue from contracts with customers. Other Revenues also include lease revenues under lessor accounting guidance of $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) and $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) for the three months ended September 30, 2021 and 2020, respectively, and $3.8 million (including $0.6 million at CL&P and $2.5 million at NSTAR Electric) and $3.2 million (including $0.6 million at CL&P and $2.1 million at NSTAR Electric) for the nine months ended September 30, 2021 and 2020, respectively.     

16.    SEGMENT INFORMATION

Eversource is organized into the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates.  These reportable segments represent substantially all of Eversource's total consolidated revenues.  Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.  The Electric Distribution reportable segment includes the results of NSTAR Electric's solar power facilities. Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources.

The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, 4) the results of other unregulated subsidiaries, which are not part of its core business, and 5) Eversource parent's equity ownership interests that are not consolidated, which primarily include the offshore wind business, a natural gas pipeline owned by Enbridge, Inc., and a renewable energy investment fund.

In the ordinary course of business, Yankee Gas, NSTAR Gas and EGMA purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline project described above. These affiliate transaction costs total $77.7 million annually and are classified as Purchased Power, Fuel and Transmission on the Eversource statements of income.

Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment.

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.   

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Eversource's segment information is as follows:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
Depreciation and Amortization	(179.8)		(28.5)		(75.4)		(11.5)		(28.0)		1.1		(322.1)
Other Operating Expenses	(1,640.5)		(176.9)		(122.4)		(26.1)		(275.2)		613.7		(1,627.4)
Operating Income/(Loss)	$	234.9	$	(19.9)	$	220.5	$	24.2	$	22.9	$	0.7	$	483.3
Interest Expense	$	(61.0)	$	(15.7)	$	(33.5)	$	(8.0)	$	(42.5)	$	12.7	$	(148.0)
Other Income, Net	25.4		6.7		5.0		1.2		325.9		(320.4)		43.8
Net Income/(Loss) Attributable to Common    Shareholders	150.4		(22.0)		139.4		17.5		304.9		(307.0)		283.2
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2
Depreciation and Amortization	(534.1)		(108.7)		(223.4)		(34.3)		(83.7)		3.1		(981.1)
Other Operating Expenses	(4,531.3)		(970.6)		(359.6)		(76.7)		(860.3)		1,918.9		(4,879.6)
Operating Income	$	566.7	$	198.5	$	647.1	$	50.0	$	55.1	$	3.1	$	1,520.5
Interest Expense	$	(175.4)	$	(44.2)	$	(98.7)	$	(24.0)	$	(125.9)	$	37.0	$	(431.2)
Other Income, Net	76.0		15.2		17.3		3.1		1,059.2		(1,046.2)		124.6
Net Income Attributable to Common Shareholders	365.4		129.6		412.4		30.0		982.5		(1,006.1)		913.8
Cash Flows Used for Investments in Plant	764.9		506.4		691.0		91.2		157.6		—		2,211.1

	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
Depreciation and Amortization	(182.0)		(14.8)		(70.6)		(10.8)		(24.1)		0.3		(302.0)
Other Operating Expenses	(1,577.0)		(104.2)		(120.6)		(10.2)		(271.5)		603.1		(1,480.4)
Operating Income/(Loss)	$	301.3	$	(8.8)	$	198.1	$	43.1	$	26.7	$	0.8	$	561.2
Interest Expense	$	(53.3)	$	(10.1)	$	(31.1)	$	(8.0)	$	(38.7)	$	7.1	$	(134.1)
Other Income, Net	16.0		0.7		6.9		1.6		401.0		(397.0)		29.2
Net Income/(Loss) Attributable to Common    Shareholders	205.5		(15.4)		125.6		23.1		396.6		(389.1)		346.3
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5
Depreciation and Amortization	(490.0)		(55.1)		(206.8)		(33.1)		(68.1)		1.2		(851.9)
Other Operating Expenses	(4,309.9)		(592.0)		(338.5)		(60.7)		(771.4)		1,787.9		(4,284.6)
Operating Income	$	682.0	$	122.9	$	590.3	$	72.8	$	61.2	$	4.8	$	1,534.0
Interest Expense	$	(160.7)	$	(32.1)	$	(93.8)	$	(25.1)	$	(119.0)	$	27.6	$	(403.1)
Other Income, Net	44.9		2.5		22.7		1.7		1,087.9		(1,076.1)		83.6
Net Income Attributable to Common Shareholders	450.6		73.3		381.8		35.6		1,035.6		(1,043.7)		933.2
Cash Flows Used for Investments in Plant	781.2		322.8		732.4		84.0		181.2		—		2,101.6

(1)    On October 9, 2020, Eversource completed the CMA asset acquisition, with Yankee Energy System, Inc. (Yankee parent) as the acquiring entity. Yankee parent is the parent company of Yankee Gas, NSTAR Gas, EGMA and Hopkinton LNG Corp. As a result of the acquisition, in the fourth quarter of 2020, our chief operating decision maker assessed the performance of the Natural Gas Distribution segment including Yankee parent. Previously, Yankee parent was presented within Other and its equity in earnings were eliminated in consolidation. Prior comparative periods were revised to conform to the current period segment presentation.

The following table summarizes Eversource's segmented total assets:

Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
As of September 30, 2021	$	25,604.2	$	6,865.6	$	12,123.5	$	2,444.9	$	21,624.5	$	(20,648.6)	$	48,014.1
As of December 31, 2020	24,981.9		6,450.5		11,695.0		2,375.2		22,089.4		(21,492.4)		46,099.6

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17.     ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS

On October 9, 2020, Eversource acquired certain assets and liabilities that comprised the NiSource Inc. (NiSource) natural gas distribution business in Massachusetts, which was previously doing business as CMA, pursuant to an asset purchase agreement (the Agreement) entered into on February 26, 2020 between Eversource and NiSource. The cash purchase price was $1.1 billion, plus a working capital amount of $68.6 million, as finalized in the first quarter of 2021. The natural gas distribution assets acquired from CMA were assigned to EGMA, an indirect wholly-owned subsidiary of Eversource formed in 2020. The LNG assets acquired from CMA were assigned to Hopkinton LNG Corp.

Preliminary Purchase Price Allocation: The purchase price allocation reflects measurement period adjustments recorded in 2021 to reduce the fair values of certain regulatory and plant assets and certain liabilities acquired, resulting in a corresponding increase to Goodwill, based on new information received during the measurement period.

The preliminary allocation of the cash purchase price is as follows:

(Millions of Dollars)
Current Assets	$	138
Restricted Cash	57
PP&E	1,184
Goodwill	50
Other Noncurrent Assets, excluding Goodwill	131
Other Current Liabilities	(81)
Other Noncurrent Liabilities	(310)
Cash Purchase Price	$	1,169

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EVERSOURCE ENERGY AND SUBSIDIARIES

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, the combined Quarterly Report on Form 10-Q for the quarters ended March 31, 2021 and June 30, 2021, as well as the Eversource 2020 combined Annual Report on Form 10-K.  References in this combined Quarterly Report on Form 10-Q to "Eversource," the "Company," "we," "us," and "our" refer to Eversource Energy and its consolidated subsidiaries.  All per-share amounts are reported on a diluted basis.  The unaudited condensed consolidated financial statements of Eversource, NSTAR Electric and PSNH and the unaudited condensed financial statements of CL&P are herein collectively referred to as the "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 Eversource. The earnings and EPS of each business discussed below do not represent a direct legal interest in the assets and liabilities of 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 (non-GAAP) that is calculated by dividing the Net Income Attributable to Common Shareholders of each business by the weighted average diluted Eversource common shares outstanding for the period. Our earnings discussion also includes non-GAAP financial measures referencing our 2021 earnings and EPS excluding charges at CL&P related to a settlement agreement that included credits to customers and funding of various customer assistance initiatives and a storm performance penalty imposed on CL&P by PURA and our 2021 and 2020 earnings and EPS excluding certain acquisition and transition costs.

We use these non-GAAP financial measures to evaluate and provide details of earnings results by business and to more fully compare and explain our 2021 and 2020 results without including these items. This information is among the primary indicators we use as a basis for evaluating performance and planning and forecasting of future periods. We believe the impacts of the CL&P settlement agreement, the storm performance penalty imposed on CL&P by PURA, and acquisition and transition costs are not indicative of our ongoing costs and performance. We view these charges as not directly related to the ongoing operations of the business and therefore not an indicator of baseline operating performance. Due to the nature and significance of the effect of these items on Net Income Attributable to Common Shareholders and EPS, we believe that the non-GAAP presentation is a more meaningful representation of our financial performance and provides additional and useful information to readers of this report in analyzing historical and future performance of our business. These non-GAAP financial measures should not be considered as alternatives to reported Net Income Attributable to Common Shareholders or EPS determined in accordance with GAAP as indicators of operating performance.

We make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, assumptions of future events, future 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:

•cyberattacks or breaches, including those resulting in the compromise of the confidentiality of our proprietary information and the personal information of our customers,

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

•    the negative impacts of the novel coronavirus (COVID-19) pandemic, including any new or emerging variants, on our customers, vendors, employees, regulators, and operations,

•    changes in economic conditions, including impact on interest rates, tax policies, and customer demand and payment ability,

•    ability or inability to commence and complete our major strategic development projects and opportunities,

•    acts of war or terrorism, physical attacks or grid disturbances that may damage and disrupt our electric transmission and electric, natural gas, and water distribution systems,

•    actions or inaction of local, state and federal regulatory, public policy and taxing bodies,

•    substandard performance of third-party suppliers and service providers,

•    fluctuations in weather patterns, including extreme weather due to climate change,

•    changes in business conditions, which could include disruptive technology or development of alternative energy sources related to our current or future business model,

•    contamination of, or disruption in, our water supplies,

•    changes in levels or timing of capital expenditures,

•    changes in laws, regulations or regulatory policy, including compliance with environmental laws and regulations,

•    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.

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All such factors are difficult to predict and contain uncertainties that may materially affect our actual results, many of which are beyond our control.  You should not place undue reliance on the forward-looking statements, as each speaks only as of the date on which such statement is made, and, except as required by federal securities laws, 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 statements. For more information, see Item 1A, Risk Factors, included in this combined Quarterly Report on Form 10-Q and in Eversource's 2020 combined Annual Report on Form 10-K.  This combined Quarterly Report on Form 10-Q and Eversource's 2020 combined Annual Report on Form 10-K also describe material contingencies and critical accounting policies in the accompanying Management's Discussion and Analysis of Financial Condition and Results of Operations and Combined Notes to Financial Statements.  We encourage you to review these items.

Financial Condition and Business Analysis

Executive Summary

Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business.  Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and Eversource Gas Company of Massachusetts (EGMA) (natural gas utilities) and Aquarion (water utilities). Eversource is organized into the electric distribution, electric transmission, natural gas distribution and water distribution reportable segments.

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

Earnings Overview and Future Outlook: 

•We earned $283.2 million, or $0.82 per share, in the third quarter of 2021, and $913.8 million, or $2.65 per share, in the first nine months of 2021, compared with $346.3 million, or $1.01 per share, in the third quarter of 2020, and $933.2 million, or $2.76 per share, in the first nine months of 2020.

•Our third quarter and first nine months of 2021 results include after-tax costs resulting from a CL&P settlement agreement on October 1, 2021 recorded within the electric distribution segment. Our first nine months of 2021 results also include an after-tax charge at CL&P recorded within the electric distribution segment for a PURA assessment as a result of CL&P’s preparation for and response to Tropical Storm Isaias in August 2020. Our third quarter and first nine months of 2021 and 2020 results also include after-tax transition and acquisition costs recorded at Eversource parent. In total, these after-tax costs were $67.5 million, or $0.20 per share, in the third quarter of 2021, and $103.1 million, or $0.30 per share, in the first nine months of 2021. Our 2020 results include after-tax transition and acquisition costs recorded at Eversource parent of $5.3 million, or $0.01 per share, in the third quarter of 2020, and $12.8 million, or $0.04 per share, in the first nine months of 2020. Excluding those costs, our non-GAAP earnings were $350.7 million, or $1.02 per share, in the third quarter of 2021, and $1.02 billion, or $2.95 per share, in the first nine months of 2021, compared with $351.6 million, or $1.02 per share, in the third quarter of 2020, and $946.0 million, or $2.80 per share, in the first nine months of 2020.

•We reaffirmed our projection of our long-term EPS growth rate through 2025 from our regulated utility businesses in the upper half of the 5 to 7 percent range. We estimate to earn within the 2021 non-GAAP earnings guidance range of between $3.81 per share and $3.93 per share, which excludes the charges associated with the CL&P settlement agreement and the penalty for CL&P’s Tropical Storm Isaias response assessed by PURA, as well as transition costs related to our October 2020 purchase of the assets of CMA and acquisition costs.

Liquidity:

•Cash flows provided by operating activities totaled $1.52 billion in the first nine months of 2021, compared with $1.50 billion in the first nine months of 2020. Investments in property, plant and equipment totaled $2.21 billion in the first nine months of 2021, compared with $2.10 billion in the first nine months of 2020.  Cash totaled $88.2 million as of September 30, 2021, compared with $106.6 million as of December 31, 2020. Our available borrowing capacity under our commercial paper programs totaled $1.86 billion as of September 30, 2021.

•In the first nine months of 2021, we issued $3.15 billion of new long-term debt, consisting of $1.00 billion at Eversource parent, $425 million at CL&P, $600 million at NSTAR Electric, $350 million at PSNH, $125 million at Yankee Gas, $550 million at EGMA, and $100 million at Aquarion Water Company of Connecticut. In the first nine months of 2021, we repaid $1.14 billion of long-term debt, consisting of $450 million at Eversource parent, $120.5 million at CL&P, $250 million at NSTAR Electric, $282 million at PSNH, and $40 million at Aquarion Water Company of Connecticut.

•On September 1, 2021, our Board of Trustees approved a common share dividend payment of $0.6025 per share, paid on September 30, 2021 to shareholders of record as of September 16, 2021.

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Regulatory and Strategic Items:

•On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. PURA approved the settlement agreement on October 27, 2021. In the settlement agreement, CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. CL&P also agreed to irrevocably set aside $10 million to fund various customer assistance initiatives as directed by PURA. In the third quarter of 2021, CL&P recorded a liability of $75 million associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues associated with the customer credits and a $10 million charge to Operations and Maintenance expense associated with the customer assistance initiatives on the three months ended September 30, 2021 income statement. In exchange for the $75 million of customer credits and assistance, PURA’s interim rate reduction docket was resolved without findings. As a result of the settlement agreement, neither the 90 basis point reduction to CL&P’s return on equity introduced in PURA’s storm-related decision issued April 28, 2021, nor the 45 basis point reduction to CL&P’s return on equity included in PURA’s draft decision issued September 14, 2021 in the interim rate reduction docket, will be implemented. Additionally, CL&P agreed to withdraw its pending appeals related to the storm performance penalty imposed in PURA’s April 28, 2021 and July 14, 2021 decisions. CL&P has also agreed to freeze its current base distribution rates until no earlier than January 1, 2024. The cumulative pre-tax impact of the October 1, 2021 settlement agreement and the Storm Isaias assessment imposed in PURA’s April 28, 2021 and July 14, 2021 decisions totaled $103.6 million, and the after-tax earnings impact was $85.8 million, or $0.25 per share, for the nine months ended September 30, 2021.

•In August of 2021, BOEM released its Final Environmental Impact Statement (EIS) for the South Fork Wind project, which assessed the environmental, social, and economic impacts of constructing the project. In August of 2021, Sunrise Wind received BOEM’s Notice of Intent (NOI) to prepare an EIS for the review of the Construction Operations Plan (COP) application submitted by Sunrise Wind.

Earnings Overview

Consolidated:  Below is 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 Common Shareholders and diluted EPS.

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2021				2020				2021				2020
(Millions of Dollars, Except Per Share Amounts)	Amount		Per Share		Amount		Per Share		Amount		Per Share		Amount		Per Share
Net Income Attributable to Common Shareholders (GAAP)	$	283.2	$	0.82	$	346.3	$	1.01	$	913.8	$	2.65	$	933.2	$	2.76
Regulated Companies (non-GAAP) (1)	$	348.5	$	1.01	$	338.8	$	0.99	$	1,023.2	$	2.97	$	941.3	$	2.79
Eversource Parent and Other Companies (non-GAAP) (1)	2.2		0.01		12.8		0.03		(6.3)		(0.02)		4.7		0.01
Non-GAAP Earnings	$	350.7	$	1.02	$	351.6	$	1.02	$	1,016.9	$	2.95	$	946.0	$	2.80
CL&P Settlement Impacts (after-tax) (2)	(63.2)		(0.19)		—		—		(85.8)		(0.25)		—		—
Transition and Acquisition Costs (after-tax) (3)	(4.3)		(0.01)		(5.3)		(0.01)		(17.3)		(0.05)		(12.8)		(0.04)
Net Income Attributable to Common Shareholders (GAAP)	$	283.2	$	0.82	$	346.3	$	1.01	$	913.8	$	2.65	$	933.2	$	2.76

(1) The 2020 amounts were revised to conform to the current period segment presentation.

(2) The 2021 after-tax costs are associated with the CL&P settlement agreement on October 1, 2021, which included a pre-tax $65 million charge to earnings for customer credits and a $10 million charge to earnings to fund various customer assistance initiatives recorded in the third quarter of 2021. The nine months ended 2021 after-tax costs also include charges recorded at CL&P as a result of the April 28, 2021 and July 14, 2021 PURA decisions, which included a $28.4 million civil penalty for non-compliance with storm performance standards currently being provided as credits to customer bills and a $0.2 million fine to the State of Connecticut’s general fund. As a result of the October 1, 2021 settlement agreement, CL&P agreed to withdraw its pending appeals related to the storm performance penalty imposed in PURA’s April 28, 2021 and July 14, 2021 decisions. Management views these collective charges as not directly related to the ongoing operations of the business and therefore not an indicator of baseline operating performance.

(3) The 2020 acquisition costs are associated with our purchase of the assets of CMA on October 9, 2020. The 2021 costs are for the transition of systems as a result of the CMA acquisition and costs associated with our pending water business acquisition.

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Regulated Companies:  Our regulated companies comprise the electric distribution, electric transmission, natural gas distribution and water distribution segments. A summary of our segment earnings and EPS is as follows: 

	For the Three Months Ended September 30,								For the Nine Months Ended September 30,
	2021				2020				2021				2020
(Millions of Dollars, Except Per Share Amounts)	Amount		Per Share		Amount		Per Share		Amount		Per Share		Amount		Per Share
Net Income - Regulated Companies (GAAP)	$	285.3	$	0.82	$	338.8	$	0.99	$	937.4	$	2.72	$	941.3	$	2.79
Electric Distribution (non-GAAP)	$	213.6	$	0.62	$	205.5	$	0.60	$	451.2	$	1.31	$	450.6	$	1.33
Electric Transmission	139.4		0.40		125.6		0.36		412.4		1.20		381.8		1.13
Natural Gas Distribution (1)	(22.0)		(0.06)		(15.4)		(0.04)		129.6		0.37		73.3		0.22
Water Distribution	17.5		0.05		23.1		0.07		30.0		0.09		35.6		0.11
Net Income - Regulated Companies (Non-GAAP)	$	348.5	$	1.01	$	338.8	$	0.99	$	1,023.2	$	2.97	$	941.3	$	2.79
CL&P Settlement Impacts (after-tax)	(63.2)		(0.19)		—		—		(85.8)		(0.25)		—		—
Net Income - Regulated Companies (GAAP)	$	285.3	$	0.82	$	338.8	$	0.99	$	937.4	$	2.72	$	941.3	$	2.79

(1) The 2020 amounts were revised to conform to the current period segment presentation.

Our electric distribution segment earnings decreased $55.1 million in the third quarter of 2021, as compared to the third quarter of 2020, due primarily to CL&P’s settlement agreement on October 1, 2021, which included a pre-tax $65 million charge to earnings for customer credits and a $10 million charge to earnings to fund various customer assistance initiatives recorded in the third quarter of 2021. The after-tax impact of the CL&P settlement agreement was $63.2 million, or $0.19 per share. Excluding those charges, electric distribution segment earnings increased $8.1 million due primarily to base distribution rate increases at NSTAR Electric effective January 1, 2021 and at PSNH effective January 1, 2021 and August 1, 2021, and higher earnings from CL&P's capital tracker mechanism due to increased electric system improvements. The earnings increase was partially offset by higher operations and maintenance expense, higher depreciation expense, higher interest expense, and higher property tax expense.

Our electric distribution segment earnings decreased $85.2 million in the first nine months of 2021, as compared to the first nine months of 2020, due primarily to CL&P’s settlement agreement on October 1, 2021 resulting in a total $75 million pre-tax charge to earnings and a $28.6 million pre-tax charge at CL&P for an assessment by PURA as a result of CL&P’s preparation for and response to Tropical Storm Isaias in August 2020 recorded in the first quarter of 2021. The after-tax impact of the CL&P settlement agreement and CL&P storm performance assessment imposed by PURA was $85.8 million, or $0.25 per share. For further information, see "Regulatory Developments and Rate Matters - Connecticut" included in this Management’s Discussion and Analysis. Excluding those charges, electric distribution segment earnings increased $0.6 million due primarily to base distribution rate increases at NSTAR Electric effective January 1, 2021, at PSNH effective January 1, 2021 and August 1, 2021, and at CL&P effective May 1, 2020, and higher earnings from CL&P's capital tracker mechanism due to increased electric system improvements. Those earnings increases were partially offset by higher operations and maintenance expense driven by higher employee-related expenses and higher storm restoration costs, higher depreciation expense, higher property tax expense, and higher interest expense.

Our electric transmission segment earnings increased $13.8 million and $30.6 million in the third quarter and the first nine months of 2021, respectively, as compared to the third quarter and the first nine months of 2020, due primarily to a higher transmission rate base as a result of our continued investment in our transmission infrastructure. The earnings increase for the nine-month period was partially offset by a lower benefit from the annual billing and cost reconciliation filing with FERC.

Our natural gas distribution segment had an increased loss of $6.6 million in the third quarter of 2021, as compared to the third quarter of 2020, due primarily to a loss from the addition of Eversource Gas Company of Massachusetts (EGMA) operations of $8.4 million due to the seasonality of the natural gas business. The increased loss was partially offset by the base distribution rate increase at Yankee Gas effective January 1, 2021 (with changes to customer rates beginning March 1, 2021).

Our natural gas distribution segment earnings increased $56.3 million in the first nine months of 2021, as compared to the first nine months of 2020, due primarily to the addition of EGMA earnings of $33.2 million. Additionally, the earnings increase was due to base distribution rate increases at NSTAR Gas effective November 1, 2020 and at Yankee Gas effective January 1, 2021 (with changes to customer rates beginning March 1, 2021), and higher earnings from capital tracker mechanisms due to continued investments in natural gas infrastructure. The earnings increase was partially offset by higher depreciation expense, higher operations and maintenance expense, and higher property tax expense.

Our water distribution segment earnings decreased $5.6 million in both the third quarter and the first nine months of 2021, as compared to the third quarter and the first nine months of 2020. The earnings decrease in both periods was due primarily to the absence in 2021 of a third quarter 2020 after-tax gain of $3.5 million and lower revenues as a result of the sale of the water system and treatment plant in Hingham, Massachusetts.

Eversource Parent and Other Companies:  Eversource parent and other companies had increased losses of $9.6 million and $15.5 million in the third quarter and the first nine months of 2021, respectively, as compared to the third quarter and the first nine months of 2020, due primarily to a higher effective tax rate. The increased loss for the nine-month period was also due to an increase in the transition and integration costs of EGMA of $4.5 million.

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Impact of COVID-19

COVID-19 has adversely affected customers, workers and the U.S. economy. We provide a critical service to our customers and have taken extensive measures to maintain its safety and reliability. We continue to address the impacts of the COVID-19 pandemic and how the related developments affect Eversource. We are in the re-entry phase of our pandemic response plan, in which the majority of our employees under remote work arrangements have transitioned back to the workplace. We have not experienced significant impacts directly related to the pandemic that have materially affected our current operations, our workforce, or results of operations. The extent of the impact to us in the future will vary, and depend on the duration, scope and severity of the pandemic and the resulting impact on economic, health care and capital market conditions. The future impact will also depend on the outcome of future proceedings before our state regulatory commissions to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses.

The current and expected future financial impacts of COVID-19 as it relates to our businesses primarily relate to collectability of customer receivables and customer payment plans and increased expenses for cleaning and supplies for personal protective equipment.

As of September 30, 2021, our allowance for uncollectible customer receivable balance of $441.7 million, of which $229.9 million relates to hardship accounts that are specifically recovered in rates charged to customers, adequately reflected the collection risk and net realizable value for our receivables. We continue to evaluate the adequacy of the uncollectible allowance based on an ongoing assessment of accounts receivable collections and customer payment trends, economic conditions, delinquency statistics, aging-based quantitative assessments, the impact on residential customer bills because of energy usage and change in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, and COVID-19 developments, including any potential federal governmental pandemic relief programs and the expansion of unemployment benefit initiatives, which help to mitigate the potential for increasing customer account delinquencies. Additionally, management considered past economic declines and corresponding uncollectible reserves as part of the current assessment.

This evaluation has shown that our operating companies have experienced an increase in aged receivables and lower cash collections from customers because of the length of the moratorium on disconnections in Connecticut and Massachusetts, and the economic slowdown resulting from the COVID-19 pandemic. In Connecticut, the moratorium on disconnections of commercial and non-hardship residential customers ended in June 2021 and September 2021, respectively, but is still in place for hardship residential customers. In Massachusetts, the moratorium on disconnections of commercial customers and residential customers ended in September 2020 and July 2021, respectively. Disconnection activities have resumed after these moratoria have expired, which has resulted in recent improved collection experience and more customers applying for, and receiving, hardship status. On July 7, 2021, the NHPUC issued an order to New Hampshire utilities that concluded that recovery of incremental bad debt or waived late fees related to the COVID-19 pandemic would be addressed in a future rate case to the extent those costs are relevant at that time. As a result of the order, in the first nine months of 2021, PSNH removed its $0.6 million deferral of net incremental COVID-19 costs. In New Hampshire, the moratorium on disconnections of non-hardship residential and commercial customers ended in late 2020 and for hardship residential customers ended in May 2021 and PSNH has resumed disconnection activities, which has resulted in improved collection of outstanding customer receivable balances.

Based upon the evaluation performed, in the first nine months of 2021, management increased the allowance for uncollectible accounts for amounts incurred as a result of COVID-19 by $25.8 million for Eversource (increase of $16.3 million for CL&P and $12.5 million at our natural gas businesses, and decrease of $1.8 million at NSTAR Electric). In the third quarter of 2021, the COVID-19 related allowance for uncollectible accounts decreased by $6.5 million at Eversource (increased $4.0 million at CL&P, and decreased $8.3 million at NSTAR Electric and $2.2 million at our natural gas businesses). The COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs at our Connecticut and Massachusetts utilities or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. As of September 30, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $57.0 million at Eversource ($20.1 million at CL&P, $8.5 million at NSTAR Electric, and $27.4 million at our natural gas businesses). Based on the status of our COVID-19 regulatory dockets, communications with our state regulatory commissions, and policies and practices in the jurisdictions in which we operate, we believe our state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses, while balancing the impact on our customers’ bills and our operating cash flows.

We continue to work closely with our state regulatory commissions and consumer advocates on customer assistance measures, including payment plan options in order to mitigate the impact on customer rates in the future, as well as financial hardship and arrearage management programs for those customers who are unable to pay their utility bills. We developed these long-term solutions for customers in order to help minimize the extent of the impact of COVID-19 on customer receivable balances and customers’ affordability in light of the current financial impact they may experience.

In the first nine months of 2021, net incremental costs incurred as a result of COVID-19 totaled $21.2 million, and related to uncollectible expense that impacts earnings, facilities and fleet cleaning, sanitizing costs and supplies for personal protective equipment, net of cost savings and benefits under the CARES Act. In the first nine months of 2021, we deferred $17.3 million of these net incremental COVID-19 costs on the balance sheet. Net incremental COVID-19 expenses that reduced pre-tax earnings totaled $3.9 million on the statement of income in the first nine months of 2021.

As of September 30, 2021, a total of $41.3 million of net deferred incremental COVID-19 costs were recorded on the balance sheet, of which $34.5 million of that deferral related to uncollectible expense that impacts earnings and $6.8 million related to cleaning and supplies for personal protective equipment.

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Liquidity

Cash totaled $88.2 million as of September 30, 2021, compared with $106.6 million as of December 31, 2020.

Short-Term Debt - Commercial Paper Programs and Credit Agreements: Eversource parent has a $2.00 billion commercial paper program allowing Eversource parent to issue commercial paper as a form of short-term debt. Eversource parent, CL&P, PSNH, NSTAR Gas, Yankee Gas, EGMA and Aquarion Water Company of Connecticut are parties to a five-year $2.00 billion revolving credit facility, which terminates on October 15, 2026. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program.  

NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility, which terminates on October 15, 2026. The revolving credit facility serves to backstop NSTAR Electric's $650 million commercial paper program.  

The amount of borrowings outstanding and available under the commercial paper programs were as follows:

	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	653.0	$	1,054.3	$	1,347.0	$	945.7	0.18	%	0.25	%
NSTAR Electric Commercial Paper Program	138.0		195.0		512.0		455.0		0.10	%	0.16	%

There were no borrowings outstanding on the revolving credit facilities as of September 30, 2021 or December 31, 2020.

CL&P and PSNH have uncommitted line of credit agreements totaling $450 million and $300 million, respectively, which will expire on May 12, 2022. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of September 30, 2021.

Amounts outstanding under the commercial paper programs are included in Notes Payable and classified in current liabilities on the Eversource and NSTAR Electric balance sheets, as all borrowings are outstanding for no more than 364 days at one time. As a result of the NSTAR Gas long-term debt issuances in October 2021, $80.0 million of commercial paper borrowings under the Eversource parent commercial paper program were classified as Long-Term Debt as of September 30, 2021.

Intercompany Borrowings: Eversource parent uses its available capital resources to provide loans to its subsidiaries to assist in meeting their short-term borrowing needs. Eversource parent records intercompany interest income from its loans to subsidiaries, which is eliminated in consolidation. Intercompany loans from Eversource parent to its subsidiaries are eliminated in consolidation on Eversource's balance sheets. As of September 30, 2021, there were intercompany loans from Eversource parent to PSNH of $66.5 million, and to a subsidiary of NSTAR Electric of $24.6 million. As of December 31, 2020, there were intercompany loans from Eversource parent to PSNH of $46.3 million, and to a subsidiary of NSTAR Electric of $21.3 million. Intercompany loans from Eversource parent are included in Notes Payable to Eversource Parent and classified in current liabilities on the respective subsidiary's balance sheets.

Availability under Long-Term Debt Issuance Authorizations: On March 31, 2021, the DPU approved NSTAR Electric's request for authorization to issue up to $1.60 billion in long-term debt through December 31, 2023. On September 10, 2021, the DPU approved EGMA’s request for authorization to issue up to $725 million in long-term debt through December 31, 2023. The remaining Eversource operating companies, including CL&P and PSNH, have utilized the long-term debt authorizations in place with the respective regulatory commissions.

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Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments:

(Millions of Dollars)	Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
CL&P:
2.05% Series A First Mortgage Bonds	$	425.0	June 2021	July 2031	Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB	(120.5)		September 2021	September 2028	Paid on par call date in advance of maturity
NSTAR Electric:
3.10% 2021 Debentures	300.0		May 2021	June 2051	Refinanced investments in eligible green expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes	(250.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
1.95% 2021 Debentures	300.0		August 2021	August 2031	Repaid short-term debt, paid capital expenditures and working capital
PSNH:
4.05% Series Q First Mortgage Bonds	(122.0)		March 2021	June 2021	Paid on par call date in advance of maturity date
3.20% Series R First Mortgage Bonds	(160.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
2.20% Series V First Mortgage Bonds	350.0		June 2021	June 2031	Repaid short-term debt, including short-term debt used to redeem Series R First Mortgage Bonds, paid capital expenditures and working capital
Other:
Eversource Parent 2.50% Series I Senior Notes	(450.0)		February 2021	March 2021	Paid on par call date in advance of maturity date
Eversource Parent 2.55% Series S Senior Notes	350.0		March 2021	March 2031	Repaid short-term debt, including short-term debt used to redeem Series I Senior Notes
Eversource Parent 1.40% Series U Senior Notes	300.0		August 2021	August 2026	Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1)	350.0		August 2021	August 2023	Repaid short-term debt
Aquarion Water Company of Connecticut 3.31%    Senior Notes	100.0		April 2021	April 2051	Repaid 5.50% Notes, repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut 5.50% Notes	(40.0)		April 2021	April 2021	Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds	90.0		August 2021	August 2026	(2)
Yankee Gas 2.88% Series T First Mortgage Bonds	35.0		August 2021	August 2051	(2)
EGMA 2.11% Series A First Mortgage Bonds	310.0		September 2021	October 2031	(2)
EGMA 2.92% Series B First Mortgage Bonds	240.0		September 2021	October 2051	(2)
NSTAR Gas 2.25% Series T First Mortgage Bonds	40.0		October 2021	November 2031	(2)
NSTAR Gas 3.03% Series U First Mortgage Bonds	40.0		October 2021	November 2051	(2)

(1)    On August 10, 2021, Eversource Parent issued $350 million of floating rate Series T Senior Notes with a maturity date of August 15, 2023. The notes have a coupon rate based on the Compounded SOFR plus 0.25%.

(2)    The use of proceeds from these various issuances refinanced existing indebtedness, funded capital expenditures and were for general corporate purposes. The EGMA indebtedness that was refinanced included $309.4 million of long-term debt.

Rate Reduction Bonds: PSNH's RRB payments consist of principal and interest and are paid semi-annually. PSNH paid $43.2 million of RRB principal payments and $18.9 million of interest payments in the first nine months of 2021, and paid $43.2 million of RRB principal payments and $20.2 million of interest payments in the first nine months of 2020.

Cash Flows:  Cash flows provided by operating activities totaled $1.52 billion in the first nine months of 2021, compared with $1.50 billion in the first nine months of 2020. Operating cash flows were favorably impacted by improvements in the timing of collections for regulatory tracking mechanisms, the addition of cash flows of EGMA, the timing of cash collections on our accounts receivable, and the timing of other working capital items. These favorable impacts were partially offset by the timing of cash payments made on our accounts payable, cash payments made in 2021 for storm restoration costs of approximately $52 million related to Tropical Storm Isaias at CL&P, a $39.5 million increase in income tax payments made in 2021, as compared to 2020, a $32.0 million increase in Pension and PBOP contributions made in 2021, as compared to 2020, and an increase in cost of removal expenditures.

On September 1, 2021, our Board of Trustees approved a common share dividend payment of $0.6025 per share, paid on September 30, 2021 to shareholders of record as of September 16, 2021. In the first nine months of 2021, we paid cash dividends of $603.6 million and issued non-cash dividends of $17.3 million in the form of treasury shares, totaling dividends of $620.9 million. In the first nine months of 2020, we paid cash dividends of $555.7 million and issued non-cash dividends of $17.2 million in the form of treasury shares, totaling dividends of $572.9 million.

Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan.

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In the first nine months of 2021, CL&P, NSTAR Electric and PSNH paid $210.3 million, $283.2 million, and $235.6 million, respectively, in common stock dividends to Eversource parent.

Investments in Property, Plant and Equipment on the 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 and deferred portions of pension and PBOP expense.  In the first nine months of 2021, investments for Eversource, CL&P, NSTAR Electric, and PSNH were $2.21 billion, $563.2 million, $675.2 million, and $217.4 million, respectively.

We expect the future operating cash flows of Eversource, CL&P, NSTAR Electric and PSNH, along with our existing borrowing availability and access to both debt and equity markets, will be sufficient to meet any working capital and future operating requirements, and capital investment forecasted opportunities.

Credit Ratings: On September 21, 2021, Fitch changed CL&P’s outlook from stable to negative. On October 29, 2021, S&P changed CL&P’s outlook from negative to stable.

Business Development and Capital Expenditures

Our consolidated capital expenditures, including amounts incurred but not paid, cost of removal, AFUDC, and the capitalized and deferred portions of pension and PBOP expense (all of which are non-cash factors), totaled $2.29 billion in the first nine months of 2021, compared to $2.19 billion in the first nine months of 2020.  These amounts included $161.2 million and $178.3 million in the first nine months of 2021 and 2020, respectively, related to information technology and facilities upgrades and enhancements, primarily at Eversource Service and The Rocky River Realty Company.

Electric Transmission Business:  Our consolidated electric transmission business capital expenditures decreased by $22.6 million in the first nine months of 2021, as compared to the first nine months of 2020.  A summary of electric transmission capital expenditures by company is as follows:  

	For the Nine Months Ended September 30,
(Millions of Dollars)	2021		2020
CL&P	$	242.4	$	296.4
NSTAR Electric	316.1		253.6
PSNH	123.7		154.8
Total Electric Transmission Segment	$	682.2	$	704.8

Eastern Massachusetts and New Hampshire Transmission Projects: These projects consist of a portfolio of electric transmission upgrades in southern New Hampshire, northern Massachusetts and continuing into the greater Boston metropolitan area, of which 28 upgrades are in Eversource's service territory (two in New Hampshire and 26 in Massachusetts). The two New Hampshire upgrades, including the Merrimack Valley Reliability Project, have been placed in service, and 23 Massachusetts upgrades have been placed in service. On December 17, 2019, the Massachusetts Siting Board issued a favorable decision on the Sudbury-Hudson Reliability Project, the last project requiring such approval. On January 17, 2020, the Town of Sudbury and Protect Sudbury, a community group, appealed the decision to the Massachusetts Supreme Judicial Court. On June 25, 2021, the Massachusetts Supreme Judicial Court rejected the Town’s appeal, affirming all aspects of the Siting Board’s final decision. On March 11, 2021, Protect Sudbury filed a petition with the Surface Transportation Board, a federal agency, claiming the Massachusetts Bay Transportation Authority (MBTA) did not have the right to lease a portion of its inactive railroad corridor, a claim previously rejected by the Massachusetts Land Court. MBTA filed its response on April 30, 2021 and a decision is anticipated by the end of the year. Additionally, Eversource must reach agreement on a Memorandum of Agreement (MOA) with the Army Corps of Engineers and consulting parties, including the Massachusetts Historical Commission and the Narragansett tribe, to establish measures to be performed by the Company to mitigate project impacts. The Army Corps of Engineers initiated the MOA consultation process with the consulting parties in late September. Although there is no mandated timeframe for resolution, the Company anticipates achieving resolution by the end of 2021. The two remaining upgrades, the Mystic-Woburn and the Wakefield-Woburn reliability projects, are under construction and are expected to be placed in service by the second quarter of 2023. We estimate our portion of the investment will be approximately $750 million, of which, $564 million has been spent and capitalized through September 30, 2021.

Southeastern Massachusetts Transmission Projects: These projects consist of a portfolio of electric transmission and substation upgrades in southeastern Massachusetts, including Cape Cod, required to reinforce the Southeastern Massachusetts transmission system and bring the system into compliance with applicable national and regional reliability standards. Of the twelve upgrades in Eversource’s service territory, four require siting approvals from the Massachusetts regulatory agencies, of which, one has received approval and is under construction, two have completed hearings and are awaiting orders and one, a joint project with National Grid, has yet to be filed. Of the remaining eight projects, two projects are under construction, and six projects have been placed in-service. We estimate our portion of the investment will be approximately $190 million, of which, $42 million has been spent and capitalized through September 30, 2021.

All project costs are anticipated to be fully recoverable through transmission rates.

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Distribution Business:  A summary of distribution capital expenditures is as follows:

	For the Nine Months Ended September 30,
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		Total Electric		Natural Gas		Water		Total
2021
Basic Business	$	160.2	$	111.7	$	39.5	$	311.4	$	140.8	$	11.0	$	463.2
Aging Infrastructure	110.5		162.7		44.3		317.5		358.3		77.7		753.5
Load Growth and Other	51.2		108.5		15.2		174.9		59.0		0.5		234.4
Total Distribution	321.9		382.9		99.0		803.8		558.1		89.2		1,451.1
Solar	—		(0.7)		—		(0.7)		—		—		(0.7)
Total	$	321.9	$	382.2	$	99.0	$	803.1	$	558.1	$	89.2	$	1,450.4
2020
Basic Business	$	149.4	$	146.5	$	38.9	$	334.8	$	59.7	$	7.6	$	402.1
Aging Infrastructure	133.2		178.8		58.7		370.7		268.0		82.5		721.2
Load Growth and Other	55.3		69.2		14.6		139.1		39.2		0.6		178.9
Total Distribution	337.9		394.5		112.2		844.6		366.9		90.7		1,302.2
Solar	—		1.1		—		1.1		—		—		1.1
Total	$	337.9	$	395.6	$	112.2	$	845.7	$	366.9	$	90.7	$	1,303.3

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 and other includes requests for new business and capacity additions on distribution lines and substation additions and expansions.

For the natural gas distribution business, basic business addresses daily operational needs including meters, pipe relocations due to public works projects, vehicles, and tools. Aging infrastructure projects seek to improve the reliability of the system through enhancements related to cast iron and bare steel replacement of main and services, corrosion mediation, and station upgrades. Load growth and other reflects growth in existing service territories including new developments, installation of services, and expansion.

For the water distribution business, basic business addresses daily operational needs including periodic meter replacement, water main relocation, facility maintenance, and tools. Aging infrastructure relates to reliability and the replacement of water mains, regulators, storage tanks, pumping stations, wellfields, reservoirs, and treatment facilities. Load growth and other reflects growth in our service territory, including improvements of acquisitions, installation of new services, and interconnections of systems.

Pending Acquisition of New England Service Company: On April 8, 2021, Aquarion and New England Service Company (NESC) entered into a definitive agreement pursuant to which Aquarion would acquire all outstanding shares of NESC. NESC provides regulated water service to approximately 10,000 customers in Connecticut, Massachusetts, and New Hampshire. The acquisition will be structured as a stock-for-stock exchange and Eversource will issue approximately 463,000 common shares at closing. The transaction requires approval from the PURA, DPU, NHPUC and other regulators and is expected to close by the end of 2021. On August 3, 2021, NESC shareholders voted to approve the pending acquisition. On October 27, 2021, PURA approved the transaction.

Offshore Wind Business: Our offshore wind business includes 50 percent ownership interests in both North East Offshore and Bay State Wind, which together hold PPAs and contracts for the Revolution Wind, South Fork Wind and Sunrise Wind projects, as well as offshore leases issued by BOEM. Our offshore wind projects are being developed and constructed through a joint and equal partnership with Ørsted. This partnership also participates in new procurement opportunities for offshore wind energy in the Northeast U.S.

The offshore leases include a 257 square-mile ocean lease off the coasts of Massachusetts and Rhode Island and a separate, adjacent 300-square-mile ocean lease located approximately 25 miles south of the coast of Massachusetts. In aggregate, these ocean lease sites jointly-owned by Eversource and Ørsted could eventually develop at least 4,000 MW of clean, renewable offshore wind energy.

We are preparing our final project designs and advancing the appropriate federal, state and local siting and permitting processes along with our offshore wind partner, Ørsted, all of which is competitively sensitive. We currently expect to make investments in our offshore wind business of approximately $300 million to $500 million during 2021, subject to advancing our final project designs and federal, state and local permitting processes. As of September 30, 2021 and December 31, 2020, Eversource's total equity investment balance in its offshore wind business was $1.13 billion and $887.1 million, respectively.

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The following table provides a summary of the Eversource and Ørsted major projects with announced contracts:

Wind Project	State Servicing	Size (MW)	Term (Years)	Price per MWh	Pricing Terms	Contract Status
Revolution Wind	Rhode Island	400	20	$98.43	Fixed price contract; no price escalation	Approved
Revolution Wind	Connecticut	304	20	$98.43 - $99.50	Fixed price contracts; no price escalation	Approved
South Fork Wind	New York (LIPA)	90	20	$160.33	2 percent average price escalation	Approved
South Fork Wind	New York (LIPA)	40	20	$86.25	2 percent average price escalation	Approved
Sunrise Wind	New York (NYSERDA)	924 (1)	25	$110.37 (2)	Fixed price contract; no price escalation	Approved

(1)    The contractual capacity increased from 880 MWs to 924 MWs, as allowed under the original agreement with NYSERDA.

(2)    Index Offshore Wind Renewable Energy Certificate (OREC) strike price.

Our offshore wind projects are subject to receipt of federal, state and local approvals necessary to construct and operate the projects. The federal permitting process is governed by BOEM, and state approvals are required from New York, Rhode Island and Massachusetts. Significant delays in the siting and permitting process resulting from the timeline for obtaining approval from BOEM and the state and local agencies could adversely impact the timing of these projects' in-service dates.

Federal Siting and Permitting Process: The South Fork Wind project has commenced the federal siting and permitting process with the filing of its Construction Operations Plan (COP) application with BOEM in 2018. The first major milestone in the BOEM review process is an issuance of a Notice of Intent (NOI) to complete an Environmental Impact Statement (EIS), which South Fork Wind received in 2018. In August 2020, we received the final review schedule from BOEM regarding South Fork Wind’s COP approval. In January 2021, BOEM released its Draft EIS for the South Fork Wind project and in August 2021, BOEM released its Final EIS, which assessed the environmental, social, and economic impacts of constructing the project and recommends measures to minimize impacts. The Final EIS will inform BOEM in deciding whether to approve the project or to approve with modifications. Identified impacts in the Final EIS included negligible to major adverse impacts to certain physical, biological or cultural resources from project construction and operations. The Final EIS also analyzed four alternatives to be evaluated as part of the process. Each of the identified alternative configurations had a similar level of environmental impacts, and if an alternative configuration was selected, the South Fork Wind project would still meet the contractual output under its PPA. The Record of Decision (ROD) is expected in November 2021 and will identify the recommended alternative. The final decision is expected in January 2022.

Based on BOEM’s final review schedule and final United States Army Corps of Engineers approval, we expect to start construction on South Fork in early 2022. South Fork Wind is designated as a “Covered Project” pursuant to Title 41 of the Fixing America’s Surface Transportation Act (FAST41) and a Major Infrastructure Project under Section 3(e) of Executive Order 13807, which provides greater federal attention on meeting the project’s permitting timelines.

Revolution Wind and Sunrise Wind filed their COP applications with BOEM in March 2020 and September 2020, respectively. Both projects received FAST41 designation in 2020. On April 30, 2021, Revolution Wind received BOEM’s NOI to prepare an EIS for the review of the COP submitted by Revolution Wind. For Revolution Wind, a final EIS is expected in the first quarter of 2023, the Record of Decision in the second quarter of 2023, and a final decision is expected in the third quarter of 2023. On August 31, 2021, Sunrise Wind received BOEM’s NOI to prepare an EIS for the review of the COP submitted by Sunrise Wind. For Sunrise Wind, a final EIS and Record of Decision is expected in the third quarter of 2023, and a final decision is expected in the fourth quarter of 2023.

State and Local Siting and Permitting Process: South Fork Wind commenced the New York state siting process in 2018. On September 17, 2020, South Fork Wind filed a Joint Proposal in the New York State Article VII siting application. Among other things, the Joint Proposal included proposed mitigations to certain environmental, community and construction impacts associated with constructing the project. South Fork Wind was joined by PSEG Long Island and several citizens advocacy organizations. On October 9, 2020, the Joint Proposal was signed by the New York Departments of Public Service, Environmental Conservation, Transportation and State as well as the Office of Parks, Recreation and Historic Preservation. On March 18, 2021, the New York Public Service Commission approved an order adopting the Joint Proposal and granting a Certificate of Environmental Compatibility and Public Need. Two petitions for re-hearing of the New York Public Service Commission decision have been filed, and South Fork Wind responded on May 3, 2021 opposing the re-hearing requests. In April 2021, South Fork Wind filed its Environmental Management and Construction Plan (EM&CP) with the New York Public Service Commission, which details the plans on how the project will be constructed in accordance with the conditions of the approved Joint Proposal. Comments from reviewing agencies and parties have been received and South Fork Wind has responded to and addressed those comments in the plan which was re-submitted in September 2021. A final approval of the EM&CP is expected by the fourth quarter 2021.

On September 10, 2020, the Town of East Hampton and the East Hampton Town Trustees announced that they had reached an agreement with South Fork Wind to issue the necessary easements and other real estate rights necessary to construct the South Fork Wind project. The Town approved the easements on January 21, 2021, and Trustees approved the lease on January 25, 2021.

State permitting applications in Rhode Island for Revolution Wind and in New York for Sunrise Wind were filed in December 2020. The Revolution Wind state siting application was deemed complete on January 22, 2021, and the preliminary hearing was completed on March 22, 2021. On April 26, 2021, the Rhode Island Energy Facilities Siting Board issued a Preliminary Decision and Order on scheduling with Advisory Opinions for local and state agencies. All advisory opinions were received in August, in accordance with the expedited schedule, and evidentiary hearings began in October 2021. The Sunrise Wind state siting application was deemed complete on July 1, 2021, initiating the formal review process, and Sunrise Wind filed a formal notice of intent to commence settlement negotiations towards a Joint Proposal on August 31, 2021.

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Projected In-Service Dates: Based on BOEM’s permit schedule outlining when BOEM will complete its review of the South Fork Wind COP, we expect the South Fork Wind project to be in-service by the end of 2023. For Revolution Wind and Sunrise Wind, based on the BOEM permit schedule included in each respective NOI, we currently expect in-service dates in 2025 for both projects, and are continuing to analyze the overall project schedules.

FERC Regulatory Matters

FERC ROE Complaints: Four separate complaints were filed at the FERC by combinations of New England state attorneys general, state regulatory commissions, consumer advocates, consumer groups, municipal parties and other parties (collectively, the Complainants). In each of the first three complaints, filed on October 1, 2011, December 27, 2012, and July 31, 2014, respectively, the Complainants challenged the NETOs' base ROE of 11.14 percent that had been utilized since 2005 and sought an order to reduce it prospectively from the date of the final FERC order and for the separate 15-month complaint periods. In the fourth complaint, filed April 29, 2016, the Complainants challenged the NETOs' base ROE billed of 10.57 percent and the maximum ROE for transmission incentive (incentive cap) of 11.74 percent, asserting that these ROEs were unjust and unreasonable.

The ROE originally billed during the period October 1, 2011 (beginning of the first complaint period) through October 15, 2014 consisted of a base ROE of 11.14 percent and incentives up to 13.1 percent. On October 16, 2014, the FERC set the base ROE at 10.57 percent and the incentive cap at 11.74 percent for the first complaint period. This was also effective for all prospective billings to customers beginning October 16, 2014. This FERC order was vacated on April 14, 2017 by the U.S. Court of Appeals for the D.C. Circuit (the Court).

All amounts associated with the first complaint period have been refunded. Eversource has recorded a reserve of $39.1 million (pre-tax and excluding interest) for the second complaint period as of September 30, 2021 and December 31, 2020. This reserve represents the difference between the billed rates during the second complaint period and a 10.57 percent base ROE and 11.74 percent incentive cap. The reserve consisted of $21.4 million for CL&P, $14.6 million for NSTAR Electric and $3.1 million for PSNH as of September 30, 2021 and December 31, 2020.

On October 16, 2018, FERC issued an order on all four complaints describing how it intends to address the issues that were remanded by the Court. FERC proposed a new framework to determine (1) whether an existing ROE is unjust and unreasonable and, if so, (2) how to calculate a replacement ROE. Initial briefs were filed by the NETOs, Complainants and FERC Trial Staff on January 11, 2019 and reply briefs were filed on March 8, 2019. The NETOs' brief was supportive of the overall ROE methodology determined in the October 16, 2018 order provided the FERC does not change the proposed methodology or alter its implementation in a manner that has a material impact on the results.

The FERC order included illustrative calculations for the first complaint using FERC's proposed frameworks with financial data from that complaint. Those illustrative calculations indicated that for the first complaint period, for the NETOs, which FERC concludes are of average financial risk, the preliminary just and reasonable base ROE is 10.41 percent and the preliminary incentive cap on total ROE is 13.08 percent.

If the results of the illustrative calculations were included in a final FERC order for each of the complaint periods, then a 10.41 percent base ROE and a 13.08 percent incentive cap would not have a significant impact on our financial statements for all of the complaint periods. These preliminary calculations are not binding and do not represent what we believe to be the most likely outcome of a final FERC order.

On November 21, 2019, FERC issued Opinion No. 569 affecting the two pending transmission ROE complaints against the Midcontinent ISO (MISO) transmission owners, in which FERC adopted a new methodology for determining base ROEs. Various parties sought rehearing. On December 23, 2019, the NETOs filed supplementary materials in the NETOs' four pending cases to respond to this new methodology because of the uncertainty of the applicability to the NETOs’ cases.

On May 21, 2020, the FERC issued its order in Opinion No. 569-A on the rehearing of the MISO transmission owners' cases, in which FERC again changed its methodology for determining the MISO transmission owners' base ROEs. Various parties appealed the MISO transmission owners' opinion. On November 19, 2020, the FERC issued Opinion No. 569-B denying rehearing of Opinion No. 569-A and reaffirmed the methodology previously adopted in Opinion No. 569-A. The new methodology differs significantly from the methodology proposed by FERC in its October 16, 2018 order to determine the NETOs' base ROEs in its four pending cases.

Given the significant uncertainty regarding the applicability of the FERC opinions in the MISO transmission owners' two complaint cases to the NETOs' pending four complaint cases, Eversource concluded that there is no reasonable basis for a change to the reserve or recognized ROEs for any of the complaint periods at this time. As well, Eversource cannot reasonably estimate a range of any gain or loss for any of the four complaint proceedings at this time.

Eversource, CL&P, NSTAR Electric and PSNH currently record revenues at the 10.57 percent base ROE and incentive cap at 11.74 percent established in the October 16, 2014 FERC order.

A change of 10 basis points to the base ROE used to establish the reserves would impact Eversource's after-tax earnings by an average of approximately $3 million for each of the four 15-month complaint periods. From the date of a final FERC order, based off of estimated 2021 rate base, a change of 10 basis points to the base ROE would impact Eversource’s future annual after-tax earnings by approximately $5 million, or $0.01 per share, per year, and will increase slightly over time as we continue to invest in our transmission infrastructure.

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FERC Notice of Inquiry on ROE: On March 21, 2019, FERC issued a Notice of Inquiry (NOI) seeking comments from all stakeholders on FERC's policies for evaluating ROEs for electric public utilities, and interstate natural gas and oil pipelines. On June 26, 2019, the NETOs jointly filed comments supporting the methodology established in the FERC’s October 16, 2018 order with minor enhancements going forward. The NETOs jointly filed reply comments in the FERC ROE NOI on July 26, 2019. On May 12, 2020, the NETOs filed supplemental comments in the NOI ROE docket. At this time, Eversource cannot predict how this proceeding will affect its transmission ROEs.

FERC Notice of Inquiry and Proposed Rulemaking on Transmission Incentives: On March 21, 2019, FERC issued an NOI seeking comments on FERC's policies for implementing electric transmission incentives. On June 26, 2019, Eversource filed comments requesting that FERC retain policies that have been effective in encouraging new transmission investment and remain flexible enough to attract investment in new and emerging transmission technologies. Eversource filed reply comments on August 26, 2019. On March 20, 2020, FERC issued a Notice of Proposed Rulemaking (NOPR) on transmission incentives. The NOPR intends to revise FERC’s electric transmission incentive policies to reflect competing uses of transmission due to generation resource mix, technological innovation and shifts in load patterns. FERC proposes to grant transmission incentives based on measurable project economics and reliability benefits to consumers rather than its current project risks and challenges framework. On July 1, 2020, Eversource filed comments generally supporting the NOPR.

On April 15, 2021, FERC issued a Supplemental NOPR that proposes to eliminate the existing 50 basis point return on equity for utilities that have been participating in a regional transmission organization (RTO ROE incentive) for more than three years. On June 25, 2021, the NETOs jointly filed comments strongly opposing the Commission’s proposal. On July 26, 2021, the NETOs filed Supplemental NOPR reply comments responding to various parties advocating for the elimination of the RTO Adder. If the FERC issues a final order eliminating the RTO ROE incentive as proposed in the Supplemental NOPR, the estimated annual impact (using 2020 actual data) on Eversource’s after-tax earnings is approximately $15 million. The Supplemental NOPR contemplates an effective date 30 days from the final order.

At this time, Eversource cannot predict the ultimate outcome of these proceedings, including possible appellate review, and the resulting impact on its transmission incentives.

Regulatory Developments and Rate Matters

Electric, Natural Gas and Water Utility Base Distribution Rates: The regulated companies’ distribution rates are set by their respective state regulatory commissions, and their tariffs include mechanisms for periodically adjusting their rates for the recovery of specific incurred costs. Other than as described below, for the first nine months of 2021, 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 Eversource 2020 Form 10-K.

Connecticut:

CL&P Deferred Storm Costs: In 2021 and 2020, multiple tropical and severe storms caused extensive damage to CL&P’s electric distribution systems and customer outages, along with significant pre-staging costs. These storms resulted in deferred pre-staging and storm restoration costs of $195 million for 2021 storms and $344 million for 2020 storms, including the catastrophic impact of Tropical Storm Isaias in August 2020, among others. Management believes all these storm costs were prudently incurred and meet the criteria for specific cost recovery.

CL&P Tropical Storm Isaias Costs: On August 4, 2020, Tropical Storm Isaias caused catastrophic damage to our electric distribution system, which resulted in significant numbers and durations of customer outages, primarily in Connecticut. In terms of customer outages, this storm was one of the worst in CL&P’s history. PURA will investigate the prudence of costs incurred by CL&P to restore service in response to Tropical Storm Isaias. That investigation is expected to occur either in a separate proceeding not yet initiated or as part of CL&P’s next rate review proceeding. Tropical Storm Isaias resulted in deferred storm restoration costs of approximately $234 million at CL&P and $251 million at Eversource as of September 30, 2021. The estimated cost of restoration may continue to change as additional cost information becomes available and final post-storm costs are deferred or capitalized. Although PURA found that CL&P’s performance in its preparation for and response to Tropical Storm Isaias fell below applicable performance standards in certain instances, CL&P believes it will be able to present credible evidence in a future proceeding demonstrating there is no reasonably close causal connection between the alleged sub-standard performance and the storm costs incurred. While it is possible that some amount of storm costs may be disallowed by PURA in a future proceeding, any such amount cannot be estimated at this time. Eversource and CL&P continue to believe that these storm restoration costs associated with Tropical Storm Isaias were prudently incurred and meet the criteria for cost recovery; and as a result, management does not expect the storm cost review by PURA to have a material impact on the financial position or results of operations of Eversource or CL&P.

CL&P Tropical Storm Isaias Response Investigation: In August 2020, PURA opened a docket to investigate the preparation for and response to Tropical Storm Isaias by Connecticut utilities, including CL&P. On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. Specifically, PURA concluded that CL&P did not satisfy the performance standards for managing its municipal liaison program, timely removing electrical hazards from blocked roads, communicating critical information to its customers, or meeting its obligation to secure adequate external contractor and mutual aid resources in a timely manner. Based on its findings, PURA ordered CL&P to adjust its future rates in a pending or future rate proceeding to reflect a monetary penalty in the form of a downward adjustment of 90 basis points in its allowed rate of return on equity (ROE), which is currently 9.25 percent. In its decision, PURA explained that additional monetary penalties and further enforcement orders pursuant to Connecticut statute would be considered in a separate proceeding that was initiated on May 6, 2021.

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On May 6, 2021, as part of the penalty proceeding, PURA issued a notice of violation that included an assessment of $30 million, consisting of a $28.4 million civil penalty for non-compliance with storm performance standards to be provided as credits on customer bills and a $1.6 million fine for violations of accident reporting requirements to be paid to the State of Connecticut’s general fund. On July 14, 2021, PURA issued a final decision in this penalty proceeding that included an assessment of $28.6 million, maintaining the $28.4 million performance penalty and reducing the $1.6 million fine for accident reporting to $0.2 million. The $28.4 million performance penalty is currently being credited to customers on electric bills beginning on September 1, 2021 over a one-year period. The $28.4 million is the maximum statutory penalty amount under applicable Connecticut law in effect at the time of Tropical Storm Isaias, which is 2.5 percent of CL&P’s annual distribution revenues. The liability for the performance penalty was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. The after-tax earnings impact of this charge was $0.07 per share.

CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. PURA approved the settlement agreement on October 27, 2021. In the settlement agreement, CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. CL&P also agreed to irrevocably set aside $10 million to fund various customer assistance initiatives as directed by PURA for disbursement to state-designated purposes, with the objective of disbursing the funds prior to April 30, 2022, including providing credits to existing hardship and non-hardship customers carrying arrearages and other purposes. In the third quarter of 2021, CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues associated with the customer credits and a $10 million charge to Operations and Maintenance expense associated with the customer assistance initiatives on the three months ended September 30, 2021 income statement.

In exchange for the $75 million of customer credits and assistance, PURA’s interim rate reduction docket was resolved without findings. As a result of the settlement agreement, neither the 90 basis point reduction to CL&P’s return on equity introduced in PURA’s storm-related decision issued April 28, 2021, nor the 45 basis point reduction to CL&P’s return on equity included in PURA’s draft decision issued September 14, 2021 in the interim rate reduction docket, will be implemented.

CL&P has also agreed that its current base distribution rates shall be frozen, subject to the customer credits described above, until no earlier than January 1, 2024. The rate freeze applies only to base distribution rates (including storm costs) and not to other rate mechanisms such as the retail rate components, rate reconciling mechanisms, formula rates and any other adjustment mechanisms. The rate freeze also does not apply to any cost recovery mechanism outside of the base distribution rates with regard to grid-modernization initiatives or any other proceedings, either currently pending or that may be initiated during the rate freeze period, that may place additional obligations on CL&P. The approval of the settlement agreement satisfies the Connecticut statute of rate review requirements that requires electric utilities to file a distribution rate case within four years of the last rate case.

As part of the settlement agreement, CL&P agreed to withdraw with prejudice its pending appeals of PURA’s April 28, 2021 and July 14, 2021 decisions related to Storm Isaias and agreed to waive its right to file an appeal and seek a judicial stay of the final decision in the interim rate reduction docket. The settlement agreement assures that CL&P will have the opportunity to petition for and demonstrate the prudence of the storm costs incurred to respond to customer outages associated with Storm Isaias in a future ratemaking proceeding.

The cumulative pre-tax impact of the settlement agreement and the Storm Isaias assessment imposed in PURA’s April 28, 2021 and July 14, 2021 decisions totaled $103.6 million, and the after-tax earnings impact was $85.8 million, or $0.25 per share, for the nine months ended September 30, 2021.

CL&P Rate Adjustment Mechanisms (RAM) Filing: On July 31, 2020, PURA temporarily suspended its June 26, 2020 approval of certain delivery rate components effective July 1, 2020, and ordered CL&P to restore rates to those in effect as of June 30, 2020 in order to allow PURA time to reexamine the rates. Rates were adjusted effective August 1, 2020. On December 2, 2020, PURA issued a final decision in which it adjusted the timing of the annual rate adjustments for the Transmission Adjustment Clause (TAC) charge, the Non-Bypassable Federally Mandated Congestion Charge (NBFMCC), the Electric System Improvements Tracker (ESI), Competitive Transition Assessment (CTA), System Benefits Charge (SBC) and Revenue Decoupling Mechanism (RDM) so that these rates take effect on May 1st of each year. On April 28, 2021, PURA issued its interim decision on CL&P’s proposal that accepted the May 1, 2021 rate proposals for the CTA, TAC, ESI and RDM, but ordered that these rate changes go into effect on June 1, 2021, as opposed to May 1, 2021. Further, PURA elected to keep in place the current rates for the NBFMCC and SBC until further review of the costs being recovered in those rates could be performed. Finally, PURA indicated it would further review CL&P’s proposal to begin recovery of 2020 under-recoveries associated with these rates on October 1, 2021, and over what the period of recovery would be at a later time.

On September 15, 2021, PURA issued its final decision in the 2020 RAM reconciliation filing, which required no adjustment to the GSC, BFMCC, NBFMCC and SBC rates, changed the TAC and RDM rates effective October 1, 2021, and maintained the CTA, ESI and base distribution rates in effect as of June 1, 2021. As part of this decision, PURA also approved two separate amortization periods, effective October 1, 2021, allowing for the collection of cumulative under-recoveries totaling $193 million as of December 31, 2020 associated with the NBFMCC and TAC rates over a 31-month period and the RDM rate over a 15-month period. PURA also required CL&P to apply the prime rate, retroactive to January 1, 2020, when calculating carrying charges for the under- or over-recoveries included in the rate components, which impacted the NBFMCC, SBC, CTA, and TAC rates.

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CL&P Impact of Third Quarter 2021 Rate Changes: On September 1, 2021, CL&P adjusted its rates for the $28.4 million penalty imposed by PURA for non-compliance with performance standards that is being provided as credits on customer bills over a one-year period. On October 1, 2021, CL&P implemented new TAC and RDM delivery rates. In total, CL&P implemented an overall net rate increase of $0.00174 per kWh for residential Rate 1 customers for these rate component charges, net of the rate decrease for the storm penalty credit. For residential customers with 700 kWh monthly usage, the impact of the September 1 and October 1, 2021 rate changes equated to a net increase of $1.22 on monthly customer bills.

Massachusetts:

NSTAR Gas and EGMA Mitigation Filings: On October 6, 2021, NSTAR Gas and EGMA made filings with the DPU regarding the deferral of certain costs for the purpose of mitigating November 1, 2021 bill impacts associated with new delivery rates as a result of increases in natural gas supply costs, thereby providing rate relief to customers. These adjustments to rates do not impact the recovery of costs, only the timing of when the costs are collected in rates. For NSTAR Gas and EGMA, these adjustments included delaying portions of the base distribution rate changes, the decoupling revenue requirement, and the recovery of certain prior period under-collections until November 1, 2022. These adjustments delay recovery of $16.7 million for NSTAR Gas and $19.7 million for EGMA for a one-year period. These adjustments will result in the under-recovery of costs beginning November 1, 2021, with no impact on the statement of income.

NSTAR Gas Distribution Rates: As part of an inflation-based mechanism, NSTAR Gas submitted its first annual Performance Based Rate Adjustment filing on September 15, 2021. Subsequently, NSTAR Gas filed a mitigation plan on October 6, 2021 to defer recovery of the base distribution rate change for NSTAR Gas until November 1, 2022 associated with depreciation and property tax expense for the 2019 and 2020 non-GSEP investments. The DPU approved a $13.6 million increase to base distribution rates on October 29, 2021 for effect on November 1, 2021.

EGMA Distribution Rates: As established in the October 7, 2020 EGMA Rate Settlement Agreement, EGMA filed for its first base distribution rate increase on September 17, 2021. The DPU approved a $13 million increase to base distribution rates on October 28, 2021 for effect on November 1, 2021.

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 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 the Eversource 2020 Form 10-K.  There have been no material changes with regard to these critical accounting policies.

Other Matters

Accounting Standards:  For information regarding new accounting standards, see Note 1B, "Summary of Significant Accounting Policies – Accounting Standards," to the financial statements.

Contractual Obligations and Commercial Commitments: See Note 9B, "Commitments and Contingencies – Long-Term Contractual Arrangements," for discussion of material changes to contractual obligations since the Eversource 2020 Form 10-K.

Web Site:  Additional financial information is available through our website at www.eversource.com.  We make available through our website a link to the SEC's EDGAR website (http://www.sec.gov/edgar/searchedgar/companysearch.html), at which site Eversource's, CL&P's, NSTAR Electric's and PSNH's combined Annual Reports on Form 10-K, combined Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to those reports may be reviewed.  Information contained on the Company's website or that can be accessed through the website is not incorporated into and does not constitute a part of this combined Quarterly Report on Form 10-Q.

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RESULTS OF OPERATIONS – EVERSOURCE ENERGY AND SUBSIDIARIES

The following provides the amounts and variances in operating revenues and expense line items in the statements of income for Eversource for the three and nine months ended September 30, 2021 and 2020 included in this combined Quarterly Report on Form 10-Q:  

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
(Millions of Dollars)	2021		2020		Increase/(Decrease)		2021		2020		Increase/(Decrease)
Operating Revenues	$	2,432.8	$	2,343.6	$	89.2	$	7,381.2	$	6,670.5	$	710.7
Operating Expenses:
Purchased Power, Fuel and Transmission	880.6		806.3		74.3		2,529.2		2,313.0		216.2
Operations and Maintenance	389.1		332.0		57.1		1,265.8		1,006.1		259.7
Depreciation	276.8		244.5		32.3		822.2		721.2		101.0
Amortization	45.2		57.5		(12.3)		158.9		130.7		28.2
Energy Efficiency Programs	143.8		145.0		(1.2)		460.8		408.8		52.0
Taxes Other Than Income Taxes	213.9		197.1		16.8		623.8		556.7		67.1
Total Operating Expenses	1,949.4		1,782.4		167.0		5,860.7		5,136.5		724.2
Operating Income	483.4		561.2		(77.8)		1,520.5		1,534.0		(13.5)
Interest Expense	148.0		134.0		14.0		431.2		403.2		28.0
Other Income, Net	43.8		29.2		14.6		124.6		83.6		41.0
Income Before Income Tax Expense	379.2		456.4		(77.2)		1,213.9		1,214.4		(0.5)
Income Tax Expense	94.1		108.2		(14.1)		294.5		275.6		18.9
Net Income	285.1		348.2		(63.1)		919.4		938.8		(19.4)
Net Income Attributable to Noncontrolling Interests	1.9		1.9		—		5.6		5.6		—
Net Income Attributable to Common Shareholders	$	283.2	$	346.3	$	(63.1)	$	913.8	$	933.2	$	(19.4)

Eversource's consolidated financial information includes the results of EGMA beginning on October 9, 2020. The natural gas distribution assets acquired from CMA on October 9, 2020 were assigned to EGMA.

Operating Revenues

Sales Volumes: A summary of our retail electric GWh sales volumes, our firm natural gas MMcf sales volumes, and our water MG sales volumes, and percentage changes, is as follows: 

	Electric				Firm Natural Gas				Water
	Sales Volumes (GWh)		Percentage (Decrease)/Increase		Sales Volumes (MMcf)		Percentage Increase		Sales Volumes (MG)		Percentage Decrease
Three Months Ended September 30:	2021	2020			2021	2020			2021	2020
Traditional	2,097	2,110	(0.6)	%	—	—	—	%	397	770	(48.4)	%
Decoupled and Special Contracts (1)(2)	12,197	12,281	(0.7)	%	16,545	15,951	3.7	%	6,856	8,102	(15.4)	%
Total Sales Volumes	14,294	14,391	(0.7)	%	16,545	15,951	3.7	%	7,253	8,872	(18.2)	%
Nine Months Ended September 30:
Traditional	5,901	5,805	1.7	%	—	—	—	%	967	1,686	(42.6)	%
Decoupled and Special Contracts (1)(2)	33,071	32,404	2.1	%	107,337	103,286	3.9	%	16,863	17,658	(4.5)	%
Total Sales Volumes	38,972	38,209	2.0	%	107,337	103,286	3.9	%	17,830	19,344	(7.8)	%

(1)    Special contracts are unique to Yankee Gas natural gas distribution 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.

(2)    Eversource acquired CMA's natural gas distribution assets on October 9, 2020. Prior year sales volumes have been presented for comparative purposes.

Weather, fluctuations in energy supply costs, conservation measures (including utility-sponsored energy efficiency programs), and economic conditions affect customer energy usage and water consumption.  Industrial sales volumes are less sensitive to temperature variations than residential and commercial sales volumes.  In our service territories, weather impacts both electric and water sales volumes during the summer and both electric and natural gas sales volumes during the winter; however, natural gas sales volumes are more sensitive to temperature variations than electric sales volumes.  Customer heating or cooling usage may not directly correlate with historical levels or with the level of degree-days that occur.

Fluctuations in retail electric sales volumes at PSNH impact earnings ("Traditional" in the table above).  For CL&P, NSTAR Electric, NSTAR Gas, EGMA, Yankee Gas, and our Connecticut water distribution business, fluctuations in retail sales volumes do not materially impact earnings due to their respective regulatory commission-approved distribution revenue decoupling mechanisms ("Decoupled" in the table above).  These distribution revenues are decoupled from their customer sales volumes, which breaks the relationship between sales volumes and revenues recognized.

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Operating Revenues: Operating Revenues by segment increased for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, as follows:

(Millions of Dollars)	Three Months Ended		Nine Months Ended
Electric Distribution	$	(5.1)	$	150.2
Natural Gas Distribution	75.3		507.8
Electric Transmission	29.0		94.5
Water Distribution	(2.3)		(5.6)
Other	3.8		98.4
Eliminations	(11.5)		(134.6)
Total Operating Revenues	$	89.2	$	710.7

Electric and Natural Gas (excluding EGMA) Distribution Revenues:

Base Distribution Revenues:

•Base electric distribution revenues increased $3.9 million and $36.3 million for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, respectively, due primarily to the impact of base distribution rate increases at NSTAR Electric effective January 1, 2021, at PSNH effective January 1, 2021 and August 1, 2021, and at CL&P effective May 1, 2020, partially offset by a base distribution rate decrease at CL&P implemented June 1, 2021. The decrease in the CL&P base distribution rate on June 1, 2021 was due primarily to the completion of the recovery of certain storm cost amortization and therefore the base rate decrease did not impact earnings.

•Base natural gas distribution revenues increased $7.9 million and $48.5 million for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, respectively, due primarily to base distribution rate increases at NSTAR Gas effective November 1, 2020, which includes a shift of recovery into base rates of certain GSEP investments, and at Yankee Gas effective January 1, 2021. Although new rates at Yankee Gas were implemented on March 1, 2021 to customers, the provisions of the base distribution rate increase were effective January 1, 2021.

Electric distribution revenues also decreased $65 million for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due to CL&P’s settlement agreement on October 1, 2021, in which CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. In the third quarter of 2021, CL&P recorded a current regulatory liability associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards that is currently being provided as credits to customer bills beginning on September 1, 2021 over a one-year period. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. For further information, see "Regulatory Developments and Rate Matters - Connecticut" included in this Management’s Discussion and Analysis.

Tracked Distribution Revenues: Tracked distribution revenues consist of certain costs that are recovered from customers in retail rates through regulatory commission-approved cost tracking mechanisms and therefore, recovery of these costs has no impact on earnings.  Revenues from certain of these cost tracking mechanisms also include certain incentives earned, return on capital tracking mechanisms, and carrying charges that are billed in rates to customers, which do impact earnings. Costs recovered through cost tracking mechanisms include, among others, energy supply and natural gas supply procurement and other energy-related costs, electric retail transmission charges, energy efficiency program costs, electric restructuring and stranded cost recovery revenues (including securitized RRB charges), and additionally for the Massachusetts utilities, pension and PBOP benefits and net metering for distributed generation. Tracked revenues also include wholesale market sales transactions, such as sales of energy and energy-related products into the ISO-NE wholesale electricity market, sales of natural gas to third party marketers, and the sale of RECs to various counterparties.

Tracked distribution revenues increased/(decreased) for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due primarily to the following:

	Electric Distribution				Natural Gas Distribution
(Millions of Dollars)	Three Months Ended		Nine Months Ended		Three Months Ended		Nine Months Ended
Retail Tariff Tracked Revenues:
Energy supply procurement	$	(47.2)	$	(148.0)	$	8.9	$	40.0
Retail transmission	77.0		156.2		—		—
Other distribution tracking mechanisms	(11.4)		36.9		1.5		12.7
Wholesale Market Sales Revenue	54.2		149.0		(3.2)		(1.1)

The decrease in energy supply procurement within electric distribution for the three months ended September 30, 2021, as compared to the same period in 2020, was driven primarily by lower average supply-related sales volumes, partially offset by higher average prices. The decrease in energy supply procurement within electric distribution for the nine months ended September 30, 2021, as compared to the same period in 2020, was driven primarily by lower average supply-related sales volumes and lower average prices. The increase in energy supply procurement within natural gas distribution for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, was driven primarily by higher average prices. The increase for the nine-month period was also attributable to higher average supply-related sales volumes.

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Fluctuations in retail transmission revenues are driven by the recovery of the costs of our wholesale transmission business, such as those billed by ISO-NE and Local and Regional Network Service charges. For further information, see "Purchased Power and Transmission Expense" below.

The increase in electric distribution wholesale market sales revenue was due primarily to higher average electricity market prices received for wholesale sales at CL&P for both the three and nine months ended September 30, 2021, as compared to the same periods in 2020. ISO-NE average market prices received for CL&P’s wholesale sales increased approximately 100 percent and 96 percent for the three and nine months ended September 30, 2021, respectively, as compared to the same periods in 2020, driven primarily by higher natural gas prices in New England. Volumes sold into the market were primarily from the sale of output generated by the Millstone PPA that CL&P entered into in 2019, as required by regulation.

EGMA Natural Gas Distribution Revenues: The addition of EGMA increased total operating revenues at the natural gas distribution segment by $62.8 million and $412.1 million for the three and nine months ended September 30, 2021, respectively.

Electric Transmission Revenues:  Electric transmission revenues increased $29.0 million and $94.5 million for the three and nine months ended September 30, 2021, respectively, as compared to the same periods in 2020, due primarily to a higher transmission rate base as a result of our continued investment in our transmission infrastructure. The increase in electric transmission revenues for the nine months ended September 30, 2021, as compared to the same period in 2020, was partially offset by a lower benefit from the annual billing and cost reconciliation filing with FERC.

Other Revenues and Eliminations: Other revenues primarily include the revenues of Eversource's service company, most of which are eliminated in consolidation. Eliminations are also primarily related to the Eversource electric transmission revenues that are derived from ISO-NE regional transmission charges to the distribution businesses of CL&P, NSTAR Electric and PSNH that recover the costs of the wholesale transmission business in rates charged to their customers.

Purchased Power, Fuel and Transmission expense includes costs associated with purchasing electricity and natural gas on behalf of our customers and the cost of energy purchase contracts, as required by regulation.  These electric and natural gas supply costs and other energy-related costs are recovered from customers in rates through commission-approved cost tracking mechanisms, which have no impact on earnings (tracked costs).  Purchased Power, Fuel and Transmission expense increased for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due primarily to the following:

(Millions of Dollars)	Three Months Ended		Nine Months Ended
Purchased Power Costs	$	(25.2)	$	(81.5)
Natural Gas Costs	47.0		222.1
Transmission Costs	79.8		155.5
Eliminations	(27.3)		(79.9)
Total Purchased Power, Fuel and Transmission	$	74.3	$	216.2

The decrease in purchased power expense at the electric distribution business for the three months ended September 30, 2021, as compared to the same period in 2020, was driven primarily by lower expense related to the procurement of energy supply resulting from lower average supply-related sales volumes, partially offset by higher average prices. The decrease in purchased power expense at the electric distribution business for the nine months ended September 30, 2021, as compared to the same period in 2020, was driven primarily by lower expense related to the procurement of energy supply resulting from lower average supply-related sales volumes and lower average prices. The lower energy supply expense in the three and nine-month periods was partially offset by higher long-term contractual energy-related costs that are recovered in the NBFMCC mechanism at CL&P.

The increase in costs at the natural gas distribution segment for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, was due primarily to the addition of EGMA natural gas supply costs as a result of the 2020 CMA asset acquisition of $18.4 million and $140.9 million, respectively, as well as higher average prices. The increase for the nine-month period was also attributable to higher average supply-related sales volumes.

The increase in transmission costs for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, was primarily the result of an increase in costs billed by ISO-NE that support regional grid investments and an increase in Local Network Service charges, which reflects the cost of transmission service provided by Eversource over our local transmission network.

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Operations and Maintenance expense includes tracked costs and costs that are part of base electric, natural gas and water distribution rates with changes impacting earnings (non-tracked costs).  Operations and Maintenance expense increased for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due primarily to the following:

(Millions of Dollars)	Three Months Ended		Nine Months Ended
Base Electric Distribution (Non-Tracked Costs):
CL&P assessment by PURA for Tropical Storm Isaias response; reflected as reduction to Operating   Revenues in the third quarter of 2021 in connection with the finalization of the settlement     agreement	$	(28.4)	$	—
CL&P charge to fund various customer assistance initiatives associated with the settlement    agreement on October 1, 2021	10.0		10.0
Employee-related expenses, including labor and benefits	(3.8)		22.9
Funding of CL&P storm reserve as part of June 1, 2021 rate change	6.0		10.0
Storm restoration costs	2.7		20.4
Vegetation Management	9.3		11.6
Operations-related expenses, including vehicles and outside services	1.4		5.6
Shared corporate costs (including computer software depreciation at Eversource Service)	4.9		15.8
Other non-tracked operations and maintenance	0.2		6.2
Total Base Electric Distribution (Non-Tracked Costs)	2.3		102.5
Tracked Costs (Electric Distribution and Electric Transmission)	5.8		22.7
Natural Gas Distribution:
Base (Non-Tracked) Costs, excluding EGMA	2.6		5.8
Tracked Costs, excluding EGMA	1.5		4.8
EGMA Operations and Maintenance	33.6		119.2
Total Natural Gas Distribution	37.7		129.8
Water Distribution:
Absence in 2021 of gain on sale of Hingham water system in July 2020	16.0		16.0
Other	0.1		0.1
Total Water Distribution	16.1		16.1
Parent and Other Companies and eliminations:
Eversource Parent and Other Companies - other operations and maintenance	3.5		81.8
Transition and Acquisition Costs	(1.4)		6.2
Eliminations	(6.9)		(99.4)
Total Operations and Maintenance	$	57.1	$	259.7

Depreciation expense increased for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due to higher utility plant in service balances, and due to the addition of EGMA utility plant balances as a result of the 2020 CMA asset acquisition of $12.0 million and $35.5 million, respectively.

Amortization expense includes the deferral of energy supply, energy-related costs and other costs that are included in certain regulatory commission-approved cost tracking mechanisms. This deferral adjusts expense to match the corresponding revenues compared to the actual costs incurred. Energy supply and energy-related costs are recovered from customers in rates and have no impact on earnings. Amortization expense also includes the amortization of certain costs as those costs are collected in rates.

Amortization decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to a decrease in storm amortization expense at CL&P related to the completion of the amortization period of certain storm cost deferred assets. The decrease was partially offset by an increase in the deferral adjustment of energy supply, energy-related and other costs. Amortization increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the deferral adjustment of energy supply, energy-related and other costs, which can fluctuate from period to period based on the timing of costs incurred and related rate changes to recover these costs. The increase for the nine-month period was partially offset by a decrease in storm amortization expense at CL&P related to the completion of the amortization period of certain storm cost deferred assets.

Energy Efficiency Programs expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to the deferral adjustment at CL&P, which reflects the actual costs of energy efficiency programs compared to the amounts billed to customers, and the timing of the recovery of energy efficiency costs. Energy Efficiency increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the addition of EGMA energy efficiency program costs as a result of the 2020 CMA asset acquisition of $45.7 million. The increase in the first nine months of 2021 was also due to the deferral adjustment at NSTAR Electric and PSNH, which reflects the actual costs of energy efficiency programs compared to the amounts billed to customers, and the timing of the recovery of energy efficiency costs. The costs for the majority of the state energy policy initiatives and expanded energy efficiency programs are recovered from customers in rates and have no impact on earnings.

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Taxes Other Than Income Taxes expense increased for the three and nine months ended September 30, 2021, as compared to the same periods in 2020, due primarily to an increase in property taxes as a result of higher utility plant balances, the addition of EGMA property taxes as a result of the 2020 CMA asset acquisition of $6.2 million and $24.1 million, respectively, and higher Connecticut gross earnings taxes.

Interest Expense increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase in interest on long-term debt as a result of new debt issuances ($7.8 million), an increase in interest expense on regulatory deferrals ($5.1 million), and an increase in interest on notes payable ($1.2 million), partially offset by an increase in AFUDC related to debt funds and other capitalized interest ($0.5 million).

Interest Expense increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase in interest on long-term debt as a result of new debt issuances ($23.5 million), an increase in interest expense on regulatory deferrals ($8.0 million), and higher amortization of debt discounts and premiums, net ($0.8 million), partially offset by a decrease in interest on notes payable ($3.4 million), a decrease in RRB interest expense ($1.0 million) and an increase in AFUDC related to debt funds and other capitalized interest ($0.6 million).

Other Income, Net increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase related to pension, SERP and PBOP non-service income components ($10.7 million) and an increase in interest income primarily from regulatory deferrals ($5.8 million), partially offset by investment losses in 2021 compared to investment income in 2020 driven by market volatility ($1.7 million).

Other Income, Net increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase related to pension, SERP and PBOP non-service income components ($29.6 million), an increase in interest income primarily from regulatory deferrals ($13.9 million) and investment income in 2021 compared to investment losses in 2020 driven by market volatility ($2.2 million), partially offset by lower AFUDC related to equity funds ($3.1 million).

Income Tax Expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to lower pre-tax earnings ($16.5 million), higher share-based payment excess tax benefits ($0.1 million), and the absence of the sale of Hingham water system ($12.5 million), partially offset by higher state taxes ($4.4 million), a decrease in amortization of EDIT ($0.9 million), an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($5.1 million), and a return to provision adjustment ($4.6 million).

Income Tax Expense increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to higher state taxes ($17.8 million), lower share-based payment excess tax benefits ($2.6 million), a return to provision adjustment ($4.6 million), and an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($7.8 million), partially offset by the absence of the sale of Hingham water system ($12.5 million) and an increase in amortization of EDIT ($1.4 million).

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RESULTS OF OPERATIONS –

THE CONNECTICUT LIGHT AND POWER COMPANY

NSTAR ELECTRIC COMPANY AND SUBSIDIARY

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES

The following provides the amounts and variances in operating revenues and expense line items in the statements of income for CL&P, NSTAR Electric and PSNH for the nine months ended September 30, 2021 and 2020 included in this combined Quarterly Report on Form 10-Q:

	For the Nine Months Ended September 30,
	CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	2021		2020		Increase/ (Decrease)		2021		2020		Increase/ (Decrease)		2021		2020		Increase/ (Decrease)
Operating Revenues	$	2,736.5	$	2,711.4	$	25.1	$	2,343.1	$	2,270.2	$	72.9	$	887.2	$	815.3	$	71.9
Operating Expenses:
Purchased Power and Transmission	1,073.7		1,089.2		(15.5)		711.7		702.1		9.6		279.5		273.3		6.2
Operations and Maintenance	465.6		417.7		47.9		421.6		369.3		52.3		168.2		151.8		16.4
Depreciation	253.1		238.7		14.4		251.5		238.2		13.3		89.5		74.5		15.0
Amortization of Regulatory Assets, Net	76.6		37.2		39.4		24.0		69.1		(45.1)		62.7		39.0		23.7
Energy Efficiency Programs	100.8		109.7		(8.9)		226.1		210.7		15.4		30.5		29.2		1.3
Taxes Other Than Income Taxes	275.3		260.6		14.7		163.5		154.1		9.4		69.7		58.4		11.3
Total Operating Expenses	2,245.1		2,153.1		92.0		1,798.4		1,743.5		54.9		700.1		626.2		73.9
Operating Income	491.4		558.3		(66.9)		544.7		526.7		18.0		187.1		189.1		(2.0)
Interest Expense	124.4		115.0		9.4		106.7		95.0		11.7		42.7		44.1		(1.4)
Other Income, Net	21.7		16.3		5.4		58.9		38.2		20.7		11.6		10.9		0.7
Income Before Income Tax Expense	388.7		459.6		(70.9)		496.9		469.9		27.0		156.0		155.9		0.1
Income Tax Expense	104.6		103.5		1.1		114.6		106.3		8.3		32.5		37.5		(5.0)
Net Income	$	284.1	$	356.1	$	(72.0)	$	382.3	$	363.6	$	18.7	$	123.5	$	118.4	$	5.1

Operating Revenues

Sales Volumes: A summary of our retail electric GWh sales volumes is as follows:

	For the Nine Months Ended September 30,
	2021	2020	Increase	Percentage Increase
CL&P	15,728	15,318	410	2.7	%
NSTAR Electric	17,343	17,086	257	1.5	%
PSNH	5,901	5,805	96	1.7	%

Fluctuations in retail electric sales volumes at PSNH impact earnings.  For CL&P and NSTAR Electric, fluctuations in retail electric sales volumes do not impact earnings due to their respective regulatory commission-approved distribution revenue decoupling mechanisms.

Operating Revenues: Operating Revenues, which consist of base distribution revenues and tracked revenues further described below, increased $25.1 million at CL&P, $72.9 million at NSTAR Electric, and $71.9 million at PSNH, for the nine months ended September 30, 2021, as compared to the same period in 2020.

Base Distribution Revenues:

•CL&P's distribution revenues decreased $3.5 million due primarily to the base distribution rate decrease implemented June 1, 2021. The decrease in the base distribution rate on June 1, 2021 was due primarily to the completion of the recovery of certain storm cost amortization and therefore the base rate decrease did not impact earnings. Excluding the reduction to revenue resulting from the completion of certain storm cost amortization, base distribution revenues increased due to the impact of a base distribution rate increase effective May 1, 2020.

•NSTAR Electric's distribution revenues increased $17.6 million due primarily to the impact of its base distribution rate increase effective January 1, 2021.

•PSNH's distribution revenues increased $22.2 million due primarily to the impact of its base distribution rate increases effective January 1, 2021 and August 1, 2021.

Electric distribution revenues also decreased $65 million for the nine months ended September 30, 2021, as compared to the same period in 2020, due to CL&P’s settlement agreement on October 1, 2021, in which CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. In the third quarter of 2021, CL&P recorded a current regulatory liability associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards that is currently being provided as credits to customer bills beginning on September 1, 2021 over a one-year period. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. For further information, see "Regulatory Developments and Rate Matters - Connecticut" included in this Management’s Discussion and Analysis.

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Tracked Revenues: Tracked distribution revenues consist of certain costs that are recovered from customers in retail rates through regulatory commission-approved cost tracking mechanisms and therefore, recovery of these costs has no impact on earnings.  Revenues from certain of these cost tracking mechanisms also include certain incentives earned, return on capital tracking mechanisms, and carrying charges that are billed in rates to customers, which do impact earnings. Costs recovered through cost tracking mechanisms include, among others, energy supply procurement and other energy-related costs, retail transmission charges, energy efficiency program costs, electric restructuring and stranded cost recovery revenues (including securitized RRB charges), and additionally for NSTAR Electric, pension and PBOP benefits and net metering for distributed generation. Tracked revenues also include wholesale market sales transactions, such as sales of energy and energy-related products into the ISO-NE wholesale electricity market and the sale of RECs to various counterparties.

Tracked revenues increased/(decreased) for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)	CL&P		NSTAR Electric		PSNH
Retail Tariff Tracked Revenues:
Energy supply procurement	$	(30.5)	$	(102.8)	$	(14.7)
Retail transmission	22.6		97.9		35.7
Other distribution tracking mechanisms	(5.9)		29.2		13.6
Wholesale Market Sales Revenue	114.2		24.9		9.9

The decrease in energy supply procurement at CL&P and PSNH was driven primarily by lower average prices, partially offset by higher average supply-related sales volumes. The decrease in energy supply procurement at NSTAR Electric was driven by both lower average prices and lower average supply-related sales volumes. Fluctuations in retail transmission revenues are driven by the recovery of the costs of our wholesale transmission business, such as those billed by ISO-NE and Local and Regional Network Service charges. For further information, see "Purchased Power and Transmission Expense" below.

The increase in electric distribution wholesale market sales revenue was due primarily to higher average electricity market prices received for wholesale sales at CL&P for the nine months ended September 30, 2021, as compared to the same period in 2020. ISO-NE average market prices received for CL&P’s wholesale sales increased approximately 96 percent for the nine months ended September 30, 2021, as compared to the same period in 2020, driven primarily by higher natural gas prices in New England. Volumes sold into the market were primarily from the sale of output generated by the Millstone PPA that CL&P entered into in 2019, as required by regulation.

Transmission Revenues: Transmission revenues increased $40.6 million at CL&P, $35.2 million at NSTAR Electric, and $18.7 million at PSNH for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to a higher transmission rate base as a result of our continued investment in our transmission infrastructure. The increase was partially offset by a lower benefit from the annual billing and cost reconciliation filing with FERC.

Eliminations: Eliminations are primarily related to the Eversource electric transmission revenues that are derived from ISO-NE regional transmission charges to the distribution businesses of CL&P, NSTAR Electric and PSNH that recover the costs of the wholesale transmission business in rates charged to their customers. The impact of eliminations decreased revenues by $22.1 million at CL&P, $34.5 million at NSTAR Electric and $18.0 million at PSNH for the nine months ended September 30, 2021, as compared to the same period in 2020.

Purchased Power and Transmission expense includes costs associated with purchasing electricity on behalf of CL&P, NSTAR Electric and PSNH's customers and the cost of energy purchase contracts, as required by regulation.  These energy supply and other energy-related costs are recovered from customers in rates through commission-approved cost tracking mechanisms, which have no impact on earnings (tracked costs). Purchased Power and Transmission expense decreased/increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)	CL&P		NSTAR Electric		PSNH
Purchased Power Costs	$	(16.0)	$	(53.1)	$	(12.4)
Transmission Costs	21.6		97.2		36.7
Eliminations	(21.1)		(34.5)		(18.1)
Total Purchased Power and Transmission	$	(15.5)	$	9.6	$	6.2

Purchased Power Costs: Included in purchased power costs are the costs associated with providing electric generation service supply to all customers who have not migrated to third party suppliers and the cost of energy purchase contracts, as required by regulation.

•The decrease at CL&P was due primarily to lower expense related to the procurement of energy supply resulting from lower average prices, partially offset by higher average supply-related sales volumes. The lower energy supply expense was partially offset by higher long-term contractual energy-related costs that are recovered in the NBFMCC mechanism.

•The decrease at NSTAR Electric was due primarily to lower expense related to the procurement of energy supply resulting from lower average prices and lower average supply-related sales volumes.

•The decrease at PSNH was due primarily to lower expense related to the procurement of energy supply resulting from lower average prices, partially offset by higher average supply-related sales volumes.

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Transmission Costs: Included in transmission costs are charges that recover the cost of transporting electricity over high-voltage lines from generation facilities to substations, including costs allocated by ISO-NE to maintain the wholesale electric market.

•The increase in transmission costs at CL&P was due primarily to an increase in Local Network Service charges, which reflect the cost of transmission service provided by Eversource over our local transmission network, and an increase in costs billed by ISO-NE that support regional grid investments. This was partially offset by a decrease in the retail transmission cost deferral, which reflects the actual costs of transmission service compared to estimated amounts billed to customers.

•The increase in transmission costs at NSTAR Electric and PSNH was due primarily to an increase in costs billed by ISO-NE and an increase in the retail transmission cost deferral, partially offset by a decrease in Local Network Service charges.

Operations and Maintenance expense includes tracked costs and costs that are part of base distribution rates with changes impacting earnings (non-tracked costs).  Operations and Maintenance expense increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)	CL&P		NSTAR Electric		PSNH
Base Electric Distribution (Non-Tracked Costs):
CL&P charge to fund various customer assistance initiatives associated with the settlement   agreement on October 1, 2021	$	10.0	$	—	$	—
Funding of CL&P storm reserve as part of June 1, 2021 rate change	10.0		—		—
Employee-related expenses, including labor and benefits	(3.5)		12.1		5.7
Storm restoration costs	7.7		9.3		3.4
Vegetation Management	1.0		0.6		10.0
Operations-related expenses, including vehicles and outside services	7.8		—		(2.2)
Shared corporate costs (including computer software depreciation at Eversource Service)	4.5		10.0		1.3
Other non-tracked operations and maintenance	1.6		2.8		1.8
Total Base Electric Distribution (Non-Tracked Costs)	39.1		34.8		20.0
Tracked Costs:
Transmission expenses	3.0		3.5		3.9
Other tracked operations and maintenance	5.8		14.0		(7.5)
Total Tracked Costs	8.8		17.5		(3.6)
Total Operations and Maintenance	$	47.9	$	52.3	$	16.4

Depreciation increased for the nine months ended September 30, 2021, as compared to the same period in 2020, for CL&P, NSTAR Electric and PSNH due to higher net plant in service balances.

Amortization of Regulatory Assets, Net expense includes the deferral of energy supply, energy-related costs and other costs that are included in certain regulatory-approved cost tracking mechanisms. This deferral adjusts expense to match the corresponding revenues compared to the actual costs incurred. Energy supply and energy-related costs are recovered from customers in rates and have no impact on earnings. Amortization expense also includes the amortization of certain costs as those costs are collected in rates. Amortization of Regulatory Assets, Net increased/decreased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The increase at CL&P was due primarily to the deferral adjustment of energy supply, energy-related and other tracked costs, which can fluctuate from period to period based on the timing of costs incurred and related rate changes to recover these costs. The increase was partially offset by a decrease in storm amortization expense related to the completion of the amortization period of certain storm cost deferred assets.

•The decrease at NSTAR Electric was due to the deferral adjustment of energy supply, energy-related costs and other tracked costs, which can fluctuate from period to period based on the timing of costs incurred and related rate changes to recover these costs.

•The increase at PSNH was due to the deferral adjustment of energy-related and other tracked costs, which can fluctuate from period to period based on the timing of costs incurred and related rate changes to recover these costs.

Energy Efficiency Programs expense includes costs of various state energy policy initiatives and expanded energy efficiency programs that are recovered from customers in rates, most of which have no impact on earnings. Energy Efficiency Programs expense increased/decreased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The decrease at CL&P was due to the deferral adjustment, which reflects actual costs of energy efficiency programs compared to the estimated amounts billed to customers, and the timing of the recovery of energy efficiency costs.

•The increases at NSTAR Electric and PSNH were due to the deferral adjustment, which reflects actual costs of energy efficiency programs compared to the estimated amounts billed to customers, and the timing of the recovery of energy efficiency costs.

Taxes Other Than Income Taxes increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The increase at CL&P was related to higher property taxes as a result of a higher utility plant balance and higher gross earnings taxes.

•The increases at NSTAR Electric and PSNH were due to higher property taxes as a result of higher utility plant balances.

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Interest Expense increased at CL&P and NSTAR Electric and decreased at PSNH for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The increase at CL&P was due to higher interest on long-term debt ($4.0 million), a decrease in AFUDC related to debt funds ($3.4 million), and an increase in interest expense on regulatory deferrals ($2.4 million).

•The increase at NSTAR Electric was due to an increase in interest expense on regulatory deferrals ($6.1 million) and higher interest on long-term debt ($5.7 million).

•The decrease at PSNH was due to a decrease in interest expense on regulatory deferrals ($1.1 million) and a decrease in RRB interest expense ($1.0 million), partially offset by a decrease in AFUDC related to debt funds ($1.2 million).

Other Income, Net increased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The increase at CL&P was due primarily to an increase related to pension, SERP and PBOP non-service income components ($8.2 million), an increase in interest income primarily on regulatory deferrals ($2.3 million), and an increase in investment income driven by market volatility ($1.2 million), partially offset by a decrease in AFUDC related to equity funds ($6.3 million).

•The increase at NSTAR Electric was due primarily to an increase related to pension, SERP and PBOP non-service income components ($8.1 million), an increase in interest income primarily on regulatory deferrals ($8.1 million), an increase in AFUDC related to equity funds ($2.8 million), and investment income in 2021 compared to investment losses in 2020 driven by market volatility ($2.1 million).

•The increase at PSNH was due primarily to an increase related to pension, SERP and PBOP non-service income components ($2.7 million) and an increase in investment income driven by market volatility ($0.2 million), partially offset by a decrease in AFUDC related to equity funds ($2.3 million).

Income Tax Expense increased/decreased for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

•The increase at CL&P was due primarily to higher state taxes ($11.0 million), lower share-based payment excess tax benefits ($0.8 million), and an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($4.2 million), partially offset by lower pre-tax earnings ($14.9 million).

•The increase at NSTAR Electric was due primarily to higher pre-tax earnings ($5.7 million), higher state taxes ($1.5 million), an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($0.2 million), and lower share-based payment excess tax benefits ($0.9 million).

•The decrease at PSNH was due primarily to an increase in amortization of EDIT ($4.2 million) and lower state taxes ($1.3 million), partially offset by lower share-based payment excess tax benefits ($0.3 million), higher pre-tax earnings ($0.1 million), and an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($0.1 million).

EARNINGS SUMMARY

CL&P's earnings decreased $72.0 million for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the settlement agreement on October 1, 2021 resulting in a total $75 million pre-tax charge to earnings and a $28.6 million pre-tax charge for an assessment by PURA as a result of CL&P’s preparation for and response to Tropical Storm Isaias in August 2020 recorded in the first quarter of 2021. The after-tax impact of the settlement agreement and the storm performance assessment imposed by PURA was $85.8 million, or $0.25 per share. Earnings were also unfavorably impacted by higher operations and maintenance expense, a higher effective tax rate, higher depreciation expense, higher property and other tax expense, and higher interest expense. The earnings decrease was partially offset by higher earnings from its capital tracker mechanism due to increased electric system improvements, the base distribution rate increase effective May 1, 2020, and an increase in transmission earnings driven by a higher transmission rate base.

NSTAR Electric's earnings increased $18.7 million for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase in transmission earnings driven by a higher transmission rate base and the base distribution rate increase effective January 1, 2021. The earnings increase was partially offset by higher operations and maintenance expense driven by higher employee-related expenses and higher storm restoration costs, higher depreciation expense and higher interest expense.

PSNH's earnings increased $5.1 million for the nine months ended September 30, 2021, as compared to the same period in 2020, due primarily to the base distribution rate increases effective January 1, 2021 and August 1, 2021, an increase in transmission earnings driven by a higher transmission rate base, a lower effective tax rate, and the impact in 2021 of a new tracker mechanism at PSNH approved as part of the 2020 rate settlement agreement. The earnings increase was partially offset by higher operations and maintenance expense, higher depreciation expense and higher property tax expense.

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LIQUIDITY

Cash Flows: CL&P had cash flows provided by operating activities of $450.6 million for the nine months ended September 30, 2021, as compared to $399.2 million in the same period of 2020. The increase in operating cash flows was due primarily to the timing of collections for regulatory tracking mechanisms, the timing of other working capital items, and a $10.6 million decrease in income tax payments made in 2021, as compared to 2020. These favorable impacts were partially offset by a $55.7 million increase in pension contributions made in 2021, as compared to 2020, the timing of cash payments made on our accounts payable, cash payments made in 2021 for storm restoration costs of approximately $52 million related to Tropical Storm Isaias, and the timing of cash collections on our accounts receivable.

NSTAR Electric had cash flows provided by operating activities of $617.3 million for the nine months ended September 30, 2021, as compared to $502.6 million in the same period of 2020. The increase in operating cash flows was due primarily to the timing of collections for regulatory tracking mechanisms, income tax refunds received of $7.5 million in 2021, as compared to $39.3 million of income tax payments made in 2020, and the timing of other working capital items. These favorable impacts were partially offset by the timing of cash payments made on our accounts payable, a $9.4 million increase in pension contributions made in 2021, as compared to 2020, and the timing of cash collections on our accounts receivable.

PSNH had cash flows provided by operating activities of $237.2 million for the nine months ended September 30, 2021, as compared to $149.2 million in the same period of 2020.  The increase in operating cash flows was due primarily to the timing of collections for regulatory tracking mechanisms primarily related to transmission costs, the absence in 2021 of pension contributions of $19.5 million made in 2020, and the timing of other working capital items. These favorable impacts were partially offset by the timing of cash payments made on our accounts payable.

For further information on CL&P's, NSTAR Electric's and PSNH's liquidity and capital resources, see "Liquidity" and "Business Development and Capital Expenditures" included in this Management's Discussion and Analysis of Financial Condition and Results of Operations.

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RESULTS OF OPERATIONS – THE CONNECTICUT LIGHT AND POWER COMPANY

The following provides the amounts and variances in operating revenues and expense line items in the statements of income for CL&P for the three months ended September 30, 2021 and 2020 included in this combined Quarterly Report on Form 10-Q:

	For the Three Months Ended September 30,
(Millions of Dollars)	2021		2020		Increase/(Decrease)
Operating Revenues	$	919.6	$	994.3	$	(74.7)
Operating Expenses:
Purchased Power and Transmission	392.3		399.1		(6.8)
Operations and Maintenance	137.8		147.5		(9.7)
Depreciation	85.3		80.6		4.7
Amortization of Regulatory Assets, Net	28.9		36.4		(7.5)
Energy Efficiency Programs	35.7		41.8		(6.1)
Taxes Other Than Income Taxes	99.9		97.7		2.2
Total Operating Expenses	779.9		803.1		(23.2)
Operating Income	139.7		191.2		(51.5)
Interest Expense	42.7		38.4		4.3
Other Income, Net	6.9		5.9		1.0
Income Before Income Tax Expense	103.9		158.7		(54.8)
Income Tax Expense	33.7		38.6		(4.9)
Net Income	$	70.2	$	120.1	$	(49.9)

Operating Revenues

Sales Volumes: CL&P's retail electric GWh sales volumes were 5,776 and 5,798 for the three months ended September 30, 2021 and 2020, respectively, resulting in a decrease of 0.4 percent. Fluctuations in retail electric sales volumes do not impact earnings due to its PURA-approved distribution revenue decoupling mechanism.

Operating Revenues: Operating Revenues, which consist of base distribution revenues and tracked revenues further described below, decreased $74.7 million for the three months ended September 30, 2021, as compared to the same period in 2020.

Base Distribution Revenues: CL&P's distribution revenues decreased $9.1 million due primarily to the impact of a base distribution rate decrease implemented on June 1, 2021. The decrease in the base distribution rate was due primarily to the completion of the recovery of certain storm cost amortization and therefore the base rate decrease did not impact earnings.

Electric distribution revenues also decreased $65 million for the three months ended September 30, 2021, as compared to the same period in 2020, due to CL&P’s settlement agreement on October 1, 2021, in which CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. In the third quarter of 2021, CL&P recorded a current regulatory liability associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards that is currently being provided as credits to customer bills beginning on September 1, 2021 over a one-year period. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. For further information, see "Regulatory Developments and Rate Matters - Connecticut" included in this Management’s Discussion and Analysis.

Tracked Revenues: Tracked revenues increased/(decreased) for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)
Retail Tariff Tracked Revenues:
Energy supply procurement	$	(14.5)
Retail transmission	13.5
Other distribution tracking mechanisms	(20.4)
Wholesale Market Sales Revenue	40.3

The decrease in energy supply procurement was driven by lower average prices, partially offset by higher average supply-related sales volumes. Fluctuations in retail transmission revenues are driven by the recovery of the costs of our wholesale transmission business, such as those billed by ISO-NE and Local and Regional Network Service charges. For further information, see "Purchased Power and Transmission Expense" below.

The increase in electric distribution wholesale market sales revenue was due primarily to higher average electricity market prices received for wholesale sales for the three months ended September 30, 2021, as compared to the same period in 2020. ISO-NE average market prices received for CL&P’s wholesale sales increased approximately 100 percent for the three months ended September 30, 2021, as compared to the same period in 2020, driven primarily by higher natural gas prices in New England. Volumes sold into the market were primarily from the sale of output generated by the Millstone PPA that CL&P entered into in 2019, as required by regulation.

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Transmission Revenues: Transmission revenues increased $13.9 million due primarily to a higher transmission rate base as a result of continued investment in our transmission infrastructure.

Eliminations: Eliminations are primarily related to transmission revenues derived from ISO-NE regional transmission charges to the distribution business that recover the costs of the wholesale transmission business. The impact of eliminations decreased revenues by $8.5 million.

Purchased Power and Transmission expense includes costs associated with purchasing electricity on behalf of CL&P's customers and the cost of energy purchase contracts, as required by regulation.  These energy supply and other energy-related costs are recovered from customers in PURA-approved cost tracking mechanisms, which have no impact on earnings (tracked costs). Purchased Power and Transmission expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)
Purchased Power Costs	$	(13.3)
Transmission Costs	14.9
Eliminations	(8.4)
Total Purchased Power and Transmission	$	(6.8)

The decrease in purchased power costs was due primarily to lower expense related to the procurement of energy supply resulting from lower average prices, partially offset by higher average supply-related sales volumes. The lower energy supply expense was partially offset by higher long-term contractual energy-related costs that are recovered in the NBFMCC mechanism.

The increase in transmission costs was due primarily to an increase in costs billed by ISO-NE that support regional grid investments. This was partially offset by a decrease in the retail transmission cost deferral, which reflects the actual costs of transmission service compared to estimated amounts billed to customers.

Operations and Maintenance expense includes tracked costs and costs that are part of base distribution rates with changes impacting earnings (non-tracked costs).  Operations and Maintenance expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to the following:

(Millions of Dollars)
Base Electric Distribution (Non-Tracked Costs):
CL&P assessment by PURA for Tropical Storm Isaias response; reflected as reduction to Operating   Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement	$	(28.4)
Charge to fund various customer assistance initiatives associated with the settlement agreement on October 1, 2021	10.0
Funding of CL&P storm reserve as part of June 1, 2021 rate change	6.0
Employee-related expenses, including labor and benefits	(7.2)
Storm Restoration Costs	(2.7)
Vegetation management	3.5
Operations-related expenses, including vehicles and outside services	3.4
Other non-tracked operations and maintenance	0.3
Total Base Electric Distribution (Non-Tracked Costs)	(15.1)
Total Tracked Costs	5.4
Total Operations and Maintenance	$	(9.7)

Depreciation expense increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to a higher net plant in service balance.

Amortization of Regulatory Assets, Net expense includes the deferral of energy supply, energy-related costs and other costs that are included in certain regulatory-approved cost tracking mechanisms, and the amortization of certain costs as those costs are collected in rates. This deferral adjusts expense to match the corresponding revenues. Energy supply and energy-related costs are recovered from customers in rates and have no impact on earnings. Amortization of Regulatory Assets, Net decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due to a decrease in storm amortization expense related to the completion of the amortization period of certain storm cost deferred assets. The decrease was partially offset by an increase in the deferral adjustment of energy supply and energy-related costs, which can fluctuate from period to period based on the timing of costs incurred and related rate changes to recover these costs.

Energy Efficiency Programs expense includes costs of various state energy policy initiatives and expanded energy efficiency programs that are recovered from customers in rates, most of which have no impact on earnings. Energy Efficiency Programs expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due to the deferral adjustment, which reflects actual costs of energy efficiency programs compared to the estimated amounts billed to customers, and the timing of the recovery of energy efficiency costs.

Taxes Other Than Income Taxes increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to higher property taxes as a result of a higher utility plant balance and higher gross earnings taxes.

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Interest Expense increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to higher interest on long-term debt ($2.5 million), a decrease in AFUDC related to debt funds ($1.0 million), and an increase in interest expense on regulatory deferrals ($0.7 million).

Other Income, Net increased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to an increase related to pension, SERP and PBOP non-service income components ($3.3 million) and an increase in interest income primarily on regulatory deferrals ($1.0 million), partially offset by a decrease in AFUDC related to equity funds ($1.9 million) and investment losses in 2021 compared to investment income in 2020 driven by market volatility ($1.5 million).

Income Tax Expense decreased for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to lower pre-tax earnings ($11.6 million), partially offset by higher state taxes ($4.1 million) and an increase in items that impact our tax rate as a result of regulatory treatment (flow-through items) and permanent differences ($2.6 million).

EARNINGS SUMMARY

CL&P's earnings decreased $49.9 million for the three months ended September 30, 2021, as compared to the same period in 2020, due primarily to the settlement agreement on October 1, 2021 resulting in a total $75 million pre-tax charge to earnings. The after-tax impact of the settlement agreement was $63.2 million, or $0.19 per share. Earnings were also unfavorably impacted by a higher effective tax rate, higher depreciation expense, and higher interest expense. The earnings decrease was partially offset by higher earnings from its capital tracker mechanism due to increased electric system improvements and an increase in transmission earnings driven by a higher transmission rate base.

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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.  Eversource's Energy Supply Risk Committee, comprised of senior officers, reviews and approves all large-scale energy related transactions entered into by its regulated companies.

Other Risk Management Activities

Interest Rate Risk Management:  We manage our interest rate risk exposure in accordance with our written policies and procedures.

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 transact with suppliers that include IPPs, industrial companies, natural gas and electric utilities, oil and natural 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.

Our regulated companies are subject to credit risk from certain long-term or high-volume supply contracts with energy marketing companies.  Our regulated companies manage the credit risk with these counterparties in accordance with established credit risk practices and monitor contracting risks, including credit risk.  As of September 30, 2021, our regulated companies held collateral (letters of credit or cash) of $108.5 million from counterparties related to our standard service contracts.  As of September 30, 2021, Eversource had $34.6 million of cash posted with ISO-NE related to energy transactions.

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 Eversource's 2020 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 Eversource 2020 Form 10-K.

ITEM 4.    CONTROLS AND PROCEDURES

Management, on behalf of Eversource, CL&P, NSTAR Electric and PSNH, evaluated the design and operation of the disclosure controls and procedures as of September 30, 2021 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 officer 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 officer and principal financial officer have concluded, based on their review, that the disclosure controls and procedures of Eversource, CL&P, NSTAR Electric and PSNH 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 officer 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 Eversource, CL&P, NSTAR Electric and PSNH during the quarter ended September 30, 2021 that have materially affected, or are reasonably likely to materially affect, internal controls over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1.    LEGAL PROCEEDINGS

We are parties to various legal proceedings.  We have disclosed certain legal proceedings in Part I, Item 3, "Legal Proceedings," and elsewhere in our 2020 Form 10-K.  These disclosures are incorporated herein by reference.  There have been no material legal proceedings identified and no material changes with regard to the legal proceedings previously disclosed in our 2020 Form 10-K.

ITEM 1A.    RISK FACTORS

We are subject to a variety of significant risks in addition to the matters set forth under our forward-looking statements section 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 Part I, Item 1A, "Risk Factors," in our 2020 Form 10-K, which risk factors are incorporated herein by reference.  These risk factors should be considered carefully in evaluating our risk profile.  The following risk factor should be read in conjunction

with the risk factors described in the 2020 Form 10-K.

Regulatory, Legislative and Compliance Risks:

The actions of regulators and legislators could result in outcomes that may adversely affect our earnings and liquidity.

The rates that our electric, natural gas and water companies charge their customers are determined by their state regulatory commissions and by the FERC. These commissions also regulate the companies' accounting, operations, the issuance of certain securities and certain other matters. The FERC also regulates the transmission of electric energy, the sale of electric energy at wholesale, accounting, issuance of certain securities and certain other matters, including reliability standards through the North American Electric Reliability Corporation (NERC).

Under state and federal law, our electric, natural gas and water companies are entitled to charge rates that are sufficient to allow them an opportunity to recover their prudently incurred operating and capital costs and a reasonable rate of return on invested capital, to attract needed capital and maintain their financial integrity, while also protecting relevant public interests. Our electric, natural gas and water companies are required to engage in regulatory approval proceedings as a part of the process of establishing the terms and rates for their respective services. Each of these companies prepares and submits periodic rate filings with their respective regulatory commissions for review and approval, which allows for various entities to challenge our current or future rates, structures or mechanisms and could alter or limit the rates we are allowed to charge our customers. These proceedings typically involve multiple parties, including governmental bodies and officials, consumer advocacy groups, and various consumers of energy, who have differing concerns. Any change in rates, including changes in allowed rate of return, are subject to regulatory approval proceedings that can be contentious, lengthy, and subject to appeal. This may lead to uncertainty as to the ultimate result of those proceedings. Established rates are also subject to subsequent prudency reviews by state regulators, whereby various portions of rates could be adjusted, subject to refund or disallowed, including cost recovery mechanisms. The ultimate outcome and timing of regulatory rate proceedings could have a significant effect on our ability to recover costs or earn an adequate return. Adverse decisions in our proceedings could adversely affect our financial position, results of operations and cash flows.

There can be no assurance that regulators will approve the recovery of all costs incurred by our electric, natural gas and water companies, including costs for construction, operation and maintenance, and storm restoration. The inability to recover a significant amount of operating costs could have an adverse effect on a company’s financial position, results of operations and cash flows.

Changes to rates may occur at times different from when costs are incurred. Additionally, catastrophic events at other utilities could result in our regulators and legislators imposing additional requirements that may lead to additional costs for the companies.

In addition to the risk of disallowance of incurred costs, regulators may also impose downward adjustments in a company’s allowed ROE as well as assess penalties and fines. These actions would have an adverse effect on our financial position, results of operations and cash flows.

The FERC has jurisdiction over our transmission costs recovery and our allowed ROEs. Certain outside parties have filed four complaints against all electric companies under the jurisdiction of ISO-NE alleging that our allowed ROEs are unjust and unreasonable. An adverse decision in any of these four complaints could adversely affect our financial position, results of operations and cash flows.

FERC's policy has encouraged competition for transmission projects, even within existing service territories of electric companies. Implementation of FERC's goals, including within our service territories, may expose us to competition for construction of transmission projects, additional regulatory considerations, and potential delay with respect to future transmission projects, which may adversely affect our results of operations and lower rate base growth.

Changes in tax laws, as well as the potential tax effects of business decisions could negatively impact our business, results of operations (including our expected project returns from our planned offshore wind facilities), financial condition and cash flows.

Other than as set forth above, there have been no additional risk factors identified and no material changes with regard to the risk factors previously disclosed in our 2020 Form 10-K.

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ITEM 2.    UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table discloses purchases of our common shares made by us or on our behalf for the periods shown below.  The common shares purchased consist of open market purchases made by the Company or an independent agent.  These share transactions related to matching contributions under the Eversource 401k Plan.

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)
July 1 - July 31, 2021	—	$	—	—	—
August 1 - August 31, 2021	21	89.05		—	—
September 1 - September 30, 2021	2,377	82.19		—	—
Total	2,398	$	82.25	—	—

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ITEM 6.    EXHIBITS    

Each document described below is filed herewith, unless designated with an asterisk (*), which exhibits are incorporated by reference by the registrant under whose name the exhibit appears.

	Exhibit No.	Description
	Listing of Exhibits (Eversource)
*	4	Fifteenth Supplemental Indenture between Eversource Energy and The Bank of New York Trust Company, N.A., as Trustee, dated as of August 1, 2021, relating to $350 million aggregate principal amount of Floating Rate Senior Notes, Series T, Due 2023 and $300 million aggregate principal amount of Senior Notes, Series U, Due 2026 (Exhibit 4.1, Eversource Energy Current Report on Form 8-K filed on August 13, 2021, File No. 001-05324)
	31	Certification by the Chief Executive Officer of Eversource Energy pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	31.1	Certification by the Chief Financial Officer of Eversource Energy pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	32	Certification by the Chief Executive Officer and Chief Financial Officer of Eversource Energy pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
	Listing of Exhibits (CL&P)
	31	Certification by the Chairman of The Connecticut Light and Power Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	31.1	Certification by the Chief Financial Officer of The Connecticut Light and Power Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	32	Certification by the Chairman and the 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
	Listing of Exhibits (NSTAR Electric Company)
*	4	Form of 1.95% Debenture due 2031 (Exhibit 4, NSTAR Electric Company Current Report on Form 8-K filed on August 23, 2021, File No. 001-02301)
	31	Certification by the Chairman of NSTAR Electric Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	31.1	Certification by the Chief Financial Officer of NSTAR Electric Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	32	Certification by the Chairman and the 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
	Listing of Exhibits (PSNH)
	31	Certification by the Chairman of Public Service Company of New Hampshire pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	31.1	Certification by the Chief Financial Officer of Public Service Company of New Hampshire pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
	32	Certification by the Chairman and the 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
	Listing of Exhibits (Eversource, CL&P, NSTAR Electric, PSNH)
	101.INS	Inline XBRL Instance Document - the instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document
	101.SCH	Inline XBRL Taxonomy Extension Schema
	101.CAL	Inline XBRL Taxonomy Extension Calculation
	101.DEF	Inline XBRL Taxonomy Extension Definition
	101.LAB	Inline XBRL Taxonomy Extension Labels

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101.PRE	Inline XBRL Taxonomy Extension Presentation
104	The cover page from the Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, formatted in Inline XBRL

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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.

	EVERSOURCE ENERGY
November 5, 2021	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
November 5, 2021	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
November 5, 2021	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.

	PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
November 5, 2021	By:	/s/ Jay S. Buth
		Jay S. Buth
		Vice President, Controller and Chief Accounting Officer

74

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph R. Nolan, Jr., certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Eversource Energy (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:  November 5, 2021

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	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, Philip J. Lembo, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Eversource Energy (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:  November 5, 2021

/s/	Philip J. Lembo
	Philip J. Lembo
	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 on Form 10-Q of Eversource Energy (the registrant) for the period ending September 30, 2021 as filed with the Securities and Exchange Commission (the Report), we, Joseph R. Nolan, Jr., President and Chief Executive Officer of the registrant, and Philip J. Lembo, 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 results of operations of the registrant.

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	President and Chief Executive Officer

/s/	Philip J. Lembo
	Philip J. Lembo
	Executive Vice President and Chief Financial Officer

Date:  November 5, 2021

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph R. Nolan, Jr., 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 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:  November 5, 2021

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Philip J. Lembo, 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 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:  November 5, 2021

/s/	Philip J. Lembo
	Philip J. Lembo
	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 on Form 10-Q of The Connecticut Light and Power Company (the registrant) for the period ending September 30, 2021 as filed with the Securities and Exchange Commission (the Report), we, Joseph R. Nolan, Jr., Chairman of the registrant, and Philip J. Lembo, 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 results of operations of the registrant.

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman

/s/	Philip J. Lembo
	Philip J. Lembo
	Executive Vice President and Chief Financial Officer

Date:  November 5, 2021

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph R. Nolan, Jr., 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:  November 5, 2021

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Philip J. Lembo, 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:  November 5, 2021

/s/	Philip J. Lembo
	Philip J. Lembo
	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 on Form 10-Q of NSTAR Electric Company (the registrant) for the period ending September 30, 2021 as filed with the Securities and Exchange Commission (the Report), we, Joseph R. Nolan, Jr., Chairman of the registrant, and Philip J. Lembo, 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 results of operations of the registrant.

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman

/s/	Philip J. Lembo
	Philip J. Lembo
	Executive Vice President and Chief Financial Officer

Date:  November 5, 2021

EX-31

Exhibit 31

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph R. Nolan, Jr., 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:  November 5, 2021

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman
	(Principal Executive Officer)

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Philip J. Lembo, 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:  November 5, 2021

/s/	Philip J. Lembo
	Philip J. Lembo
	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 on Form 10-Q of Public Service Company of New Hampshire (the registrant) for the period ending September 30, 2021 as filed with the Securities and Exchange Commission (the Report), we, Joseph R. Nolan, Jr., Chairman of the registrant, and Philip J. Lembo, 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 results of operations of the registrant.

/s/	Joseph R. Nolan, Jr.
	Joseph R. Nolan, Jr.
	Chairman

/s/	Philip J. Lembo
	Philip J. Lembo
	Executive Vice President and Chief Financial Officer

Date:  November 5, 2021

XML

COVER PAGE - shares	9 Months Ended
	Sep. 30, 2021	Oct. 31, 2021
Document And Entity [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity Registrant Name	EVERSOURCE ENERGY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	300 Cadwell Drive
Entity Address, City or Town	Springfield
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01104
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-05324
Entity Tax Identification Number	04-2147929
Title of 12(b) Security	Common Shares, $5.00 par value per share
Trading Symbol	ES
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		343,805,812
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
The Connecticut Light and Power Company
Document And Entity [Line Items]
Entity Registrant Name	THE CONNECTICUT LIGHT AND POWER COMPANY
Entity Incorporation, State or Country Code	CT
Entity Address, Address Line One	107 Selden Street
Entity Address, City or Town	Berlin
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06037-1616
City Area Code	800
Local Phone Number	286-5000
Entity File Number	000-00404
Entity Tax Identification Number	06-0303850
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		6,035,205
Entity Central Index Key	0000023426
Current Fiscal Year End Date	--12-31
NSTAR Electric Company
Document And Entity [Line Items]
Entity Registrant Name	NSTAR ELECTRIC COMPANY
Entity Incorporation, State or Country Code	MA
Entity Address, Address Line One	800 Boylston Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02199
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-02301
Entity Tax Identification Number	04-1278810
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		200
Entity Central Index Key	0000013372
Current Fiscal Year End Date	--12-31
Public Service Company of New Hampshire
Document And Entity [Line Items]
Entity Registrant Name	PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE
Entity Incorporation, State or Country Code	NH
Entity Address, Address Line One	Energy Park
Entity Address, Address Line Two	780 North Commercial Street
Entity Address, City or Town	Manchester
Entity Address, State or Province	NH
Entity Address, Postal Zip Code	03101-1134
City Area Code	800
Local Phone Number	286-5000
Entity File Number	001-06392
Entity Tax Identification Number	02-0181050
Entity Filer Category	Non-accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		301
Entity Central Index Key	0000315256
Current Fiscal Year End Date	--12-31

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash	$ 88,204	$ 106,599
Receivables, Net (net of allowance for uncollectible accounts)	1,288,758	1,195,925
Unbilled Revenues	176,325	233,025
Fuel, Materials, Supplies and REC Inventory	217,286	265,599
Regulatory Assets	1,016,304	1,076,556
Prepayments	177,869	105,620
Other Current Assets	108,807	146,819
Total Current Assets	3,073,553	3,130,143
Property, Plant and Equipment, Net	32,467,069	30,882,523
Deferred Debits and Other Assets:
Regulatory Assets	5,458,928	5,493,330
Goodwill	4,453,618	4,445,988
Investments in Unconsolidated Affiliates	1,356,313	1,107,143
Marketable Securities	466,628	456,617
Other Long-Term Assets	737,946	583,854
Total Deferred Debits and Other Assets	12,473,433	12,086,932
Total Assets	48,014,055	46,099,598
Current Liabilities:
Notes Payable	711,000	1,249,325
Long-Term Debt – Current Portion	798,880	1,053,186
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,289,225	1,370,647
Regulatory Liabilities	612,931	389,430
Other Current Liabilities	802,831	809,214
Total Current Liabilities	4,258,077	4,915,012
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	4,341,105	4,095,339
Regulatory Liabilities	3,907,582	3,850,781
Derivative Liabilities	256,569	294,535
Asset Retirement Obligations	505,005	499,713
Accrued Pension, SERP and PBOP	1,330,037	1,653,788
Other Long-Term Liabilities	974,497	948,506
Total Deferred Credits and Other Liabilities	11,314,795	11,342,662
Long-Term Debt	17,420,300	15,125,876
Rate Reduction Bonds	453,702	496,912
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Common Shares	1,789,092	1,789,092
Capital Surplus, Paid In	8,050,872	8,015,663
Retained Earnings	4,906,151	4,613,201
Accumulated Other Comprehensive Income (Loss)	(71,865)	(76,411)
Treasury Stock	(262,639)	(277,979)
Common Shareholders' Equity	14,411,611	14,063,566
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	48,014,055	46,099,598
The Connecticut Light and Power Company
Current Assets:
Cash	62,791	90,801
Receivables, Net (net of allowance for uncollectible accounts)	549,144	459,214
Accounts Receivable from Affiliated Companies	38,544	17,486
Unbilled Revenues	52,589	57,407
Fuel, Materials, Supplies and REC Inventory	54,894	57,924
Regulatory Assets	325,268	345,622
Prepaid Property Taxes	76,829	25,779
Other Current Assets	47,402	58,171
Total Current Assets	1,207,461	1,112,404
Property, Plant and Equipment, Net	10,598,836	10,234,556
Deferred Debits and Other Assets:
Regulatory Assets	1,981,805	1,866,152
Other Long-Term Assets	267,312	242,862
Total Deferred Debits and Other Assets	2,249,117	2,109,014
Total Assets	14,055,414	13,455,974
Current Liabilities:
Accounts Payable	473,287	451,240
Accounts Payable to Affiliated Companies	98,298	51,118
Obligations to Third Party Suppliers	53,183	49,967
Regulatory Liabilities	311,269	137,166
Derivative Liabilities	72,249	68,767
Other Current Liabilities	168,547	102,060
Total Current Liabilities	1,176,833	860,318
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,495,407	1,408,343
Regulatory Liabilities	1,213,469	1,204,942
Derivative Liabilities	256,569	294,535
Accrued Pension, SERP and PBOP	313,206	478,325
Other Long-Term Liabilities	154,249	133,690
Total Deferred Credits and Other Liabilities	3,432,900	3,519,835
Long-Term Debt	4,215,096	3,914,835
Noncontrolling Interest – Preferred Stock of Subsidiaries	116,200	116,200
Common Shareholders' Equity:
Common Shares	60,352	60,352
Capital Surplus, Paid In	2,810,765	2,810,765
Retained Earnings	2,243,004	2,173,367
Accumulated Other Comprehensive Income (Loss)	264	302
Common Shareholders' Equity	5,114,385	5,044,786
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	14,055,414	13,455,974
NSTAR Electric Company
Current Assets:
Cash	3,538	102
Receivables, Net (net of allowance for uncollectible accounts)	489,503	403,045
Accounts Receivable from Affiliated Companies	27,417	30,095
Unbilled Revenues	47,844	38,342
Fuel, Materials, Supplies and REC Inventory	83,667	133,894
Taxes Receivable	0	65,051
Regulatory Assets	388,408	399,882
Other Current Assets	22,490	21,833
Total Current Assets	1,062,867	1,092,244
Property, Plant and Equipment, Net	10,611,728	10,123,062
Deferred Debits and Other Assets:
Regulatory Assets	1,247,715	1,304,019
Prepaid PBOP	224,244	204,138
Other Long-Term Assets	185,555	162,836
Total Deferred Debits and Other Assets	1,657,514	1,670,993
Total Assets	13,332,109	12,886,299
Current Liabilities:
Notes Payable	138,000	195,000
Notes Payable to Eversource Parent	24,600	21,300
Long-Term Debt – Current Portion	0	250,000
Accounts Payable	338,369	383,558
Accounts Payable to Affiliated Companies	78,974	95,703
Obligations to Third Party Suppliers	137,211	98,572
Renewable Portfolio Standards Compliance Obligations	72,124	127,536
Regulatory Liabilities	205,771	164,761
Other Current Liabilities	118,747	72,118
Total Current Liabilities	1,113,796	1,408,548
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,494,976	1,459,906
Regulatory Liabilities	1,561,572	1,550,390
Accrued Pension, SERP and PBOP	110,752	172,571
Other Long-Term Liabilities	344,088	337,245
Total Deferred Credits and Other Liabilities	3,511,388	3,520,112
Long-Term Debt	3,984,724	3,393,221
Noncontrolling Interest – Preferred Stock of Subsidiaries	43,000	43,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	2,053,942	1,993,942
Retained Earnings	2,624,784	2,527,167
Accumulated Other Comprehensive Income (Loss)	475	309
Common Shareholders' Equity	4,679,201	4,521,418
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	13,332,109	12,886,299
Public Service Company of New Hampshire
Current Assets:
Cash	3,869	141
Receivables, Net (net of allowance for uncollectible accounts)	136,481	119,899
Accounts Receivable from Affiliated Companies	13,866	10,925
Unbilled Revenues	46,854	46,041
Fuel, Materials, Supplies and REC Inventory	24,789	26,829
Regulatory Assets	97,948	115,852
Prepaid Property Taxes	5,987	26,257
Special Deposits	18,605	36,767
Other Current Assets	2,851	10,788
Total Current Assets	351,250	393,499
Property, Plant and Equipment, Net	3,529,050	3,374,270
Deferred Debits and Other Assets:
Regulatory Assets	829,848	873,203
Other Long-Term Assets	22,684	23,733
Total Deferred Debits and Other Assets	852,532	896,936
Total Assets	4,732,832	4,664,705
Current Liabilities:
Notes Payable to Eversource Parent	66,500	46,300
Long-Term Debt – Current Portion	0	282,000
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	108,243	132,635
Accounts Payable to Affiliated Companies	25,055	43,397
Regulatory Liabilities	96,817	58,756
Other Current Liabilities	61,883	58,487
Total Current Liabilities	401,708	664,785
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	535,656	537,627
Regulatory Liabilities	389,426	383,183
Accrued Pension, SERP and PBOP	162,115	184,715
Other Long-Term Liabilities	35,564	37,874
Total Deferred Credits and Other Liabilities	1,122,761	1,143,399
Long-Term Debt	1,163,630	817,070
Rate Reduction Bonds	453,702	496,912
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,088,134	928,134
Retained Earnings	502,870	615,018
Accumulated Other Comprehensive Income (Loss)	27	(613)
Common Shareholders' Equity	1,591,031	1,542,539
Commitments and Contingencies (Note 9)
Total Liabilities and Capitalization	$ 4,732,832	$ 4,664,705

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Allowance for uncollectible accounts	$ 441,723	$ 358,851
The Connecticut Light and Power Company
Allowance for uncollectible accounts	195,463	157,447
NSTAR Electric Company
Allowance for uncollectible accounts	105,020	91,583
Public Service Company of New Hampshire
Allowance for uncollectible accounts	$ 16,996	$ 17,157

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenues	$ 2,432,794	$ 2,343,642	$ 7,381,172	$ 6,670,497
Operating Expenses:
Purchased Power, Fuel and Transmission	880,639	806,254	2,529,217	2,312,957
Operations and Maintenance	389,065	332,031	1,265,754	1,006,148
Depreciation	276,846	244,453	822,197	721,179
Amortization	45,236	57,515	158,860	130,687
Energy Efficiency Programs	143,796	145,047	460,814	408,794
Taxes Other Than Income Taxes	213,881	197,112	623,827	556,726
Total Operating Expenses	1,949,463	1,782,412	5,860,669	5,136,491
Operating Income/(Loss)	483,331	561,230	1,520,503	1,534,006
Interest Expense	147,962	134,066	431,162	403,067
Other Income, Net	43,768	29,218	124,588	83,565
Income Before Income Tax Expense	379,137	456,382	1,213,929	1,214,504
Income Tax Expense	94,091	108,242	294,461	275,621
Net Income	285,046	348,140	919,468	938,883
Net Income Attributable to Noncontrolling Interests	1,880	1,880	5,639	5,639
Net Income Attributable to Common Shareholders	$ 283,166	$ 346,260	$ 913,829	$ 933,244
Basic Earnings Per Common Share (in dollars per share)	$ 0.82	$ 1.01	$ 2.66	$ 2.77
Diluted Earnings Per Common Share (in dollars per share)	$ 0.82	$ 1.01	$ 2.65	$ 2.76
Weighted Average Common Shares Outstanding:
Basic (in shares)	344,023,846	343,076,614	343,848,905	337,375,172
Diluted (in shares)	344,669,782	343,773,602	344,480,056	338,424,100
The Connecticut Light and Power Company
Operating Revenues	$ 919,643	$ 994,270	$ 2,736,513	$ 2,711,394
Operating Expenses:
Purchased Power, Fuel and Transmission	392,301	399,117	1,073,712	1,089,232
Operations and Maintenance	137,816	147,487	465,630	417,717
Depreciation	85,304	80,583	253,132	238,735
Amortization of Regulatory Assets, Net	28,921	36,365	76,637	37,215
Energy Efficiency Programs	35,714	41,829	100,810	109,655
Taxes Other Than Income Taxes	99,901	97,715	275,178	260,571
Total Operating Expenses	779,957	803,096	2,245,099	2,153,125
Operating Income/(Loss)	139,686	191,174	491,414	558,269
Interest Expense	42,778	38,369	124,371	114,972
Other Income, Net	6,903	5,917	21,690	16,273
Income Before Income Tax Expense	103,811	158,722	388,733	459,570
Income Tax Expense	33,658	38,625	104,626	103,464
Net Income	70,153	120,097	284,107	356,106
NSTAR Electric Company
Operating Revenues	918,698	875,371	2,343,116	2,270,174
Operating Expenses:
Purchased Power, Fuel and Transmission	294,052	267,375	711,667	702,117
Operations and Maintenance	142,074	131,143	421,649	369,293
Depreciation	84,820	80,366	251,530	238,232
Amortization of Regulatory Assets, Net	8,073	22,527	23,963	69,139
Energy Efficiency Programs	86,699	85,244	226,071	210,666
Taxes Other Than Income Taxes	54,723	54,680	163,501	153,985
Total Operating Expenses	670,441	641,335	1,798,381	1,743,432
Operating Income/(Loss)	248,257	234,036	544,735	526,742
Interest Expense	37,329	31,029	106,829	95,000
Other Income, Net	20,215	12,802	58,941	38,152
Income Before Income Tax Expense	231,143	215,809	496,847	469,894
Income Tax Expense	53,692	50,081	114,560	106,309
Net Income	177,451	165,728	382,287	363,585
Public Service Company of New Hampshire
Operating Revenues	314,893	283,669	887,177	815,261
Operating Expenses:
Purchased Power, Fuel and Transmission	107,353	96,612	279,475	273,311
Operations and Maintenance	57,041	50,657	168,242	151,802
Depreciation	30,169	25,410	89,462	74,494
Amortization of Regulatory Assets, Net	17,922	7,360	62,744	39,034
Energy Efficiency Programs	10,762	11,081	30,475	29,231
Taxes Other Than Income Taxes	24,038	18,174	69,639	58,331
Total Operating Expenses	247,285	209,294	700,037	626,203
Operating Income/(Loss)	67,608	74,375	187,140	189,058
Interest Expense	14,321	14,942	42,774	44,029
Other Income, Net	3,171	4,065	11,598	10,882
Income Before Income Tax Expense	56,458	63,498	155,964	155,911
Income Tax Expense	12,315	16,347	32,512	37,527
Net Income	$ 44,143	$ 47,151	$ 123,452	$ 118,384

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Income	$ 285,046	$ 348,140	$ 919,468	$ 938,883
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	115	602	967	1,218
Changes in Unrealized (Losses)/Gains on Marketable Securities	(106)	(134)	(569)	295
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	2,468	1,693	4,148	3,149
Net OCI	2,477	2,161	4,546	4,662
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)	(5,639)	(5,639)
Comprehensive Income Attributable to Common Shareholders	285,643	348,421	918,375	937,906
The Connecticut Light and Power Company
Net Income	70,153	120,097	284,107	356,106
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(7)	(20)	(20)
Changes in Unrealized (Losses)/Gains on Marketable Securities	(2)	(4)	(18)	11
Net OCI	(9)	(11)	(38)	(9)
Comprehensive Income Attributable to Common Shareholders	70,144	120,086	284,069	356,097
NSTAR Electric Company
Net Income	177,451	165,728	382,287	363,585
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	5	109	293	327
Changes in Unrealized (Losses)/Gains on Marketable Securities	(1)	(1)	(5)	2
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	(40)	(43)	(122)	(129)
Net OCI	(36)	65	166	200
Comprehensive Income Attributable to Common Shareholders	177,415	165,793	382,453	363,785
Public Service Company of New Hampshire
Net Income	44,143	47,151	123,452	118,384
Other Comprehensive Income (Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	109	268	673	806
Changes in Unrealized (Losses)/Gains on Marketable Securities	(6)	(8)	(33)	17
Net OCI	103	260	640	823
Comprehensive Income Attributable to Common Shareholders	$ 44,246	$ 47,411	$ 124,092	$ 119,207

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CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Adoption of New Accounting Standard	Common Shares	Capital Surplus, Paid In	Retained Earnings	Retained Earnings Adoption of New Accounting Standard	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock	The Connecticut Light and Power Company	The Connecticut Light and Power Company Adoption of New Accounting Standard	The Connecticut Light and Power Company Common Shares	The Connecticut Light and Power Company Capital Surplus, Paid In	The Connecticut Light and Power Company Retained Earnings	The Connecticut Light and Power Company Retained Earnings Adoption of New Accounting Standard	The Connecticut Light and Power Company Accumulated Other Comprehensive (Loss)/Income	NSTAR Electric Company	NSTAR Electric Company Adoption of New Accounting Standard	NSTAR Electric Company Common Shares	NSTAR Electric Company Capital Surplus, Paid In	NSTAR Electric Company Retained Earnings	NSTAR Electric Company Retained Earnings Adoption of New Accounting Standard	NSTAR Electric Company Accumulated Other Comprehensive (Loss)/Income	Public Service Company of New Hampshire	Public Service Company of New Hampshire Adoption of New Accounting Standard	Public Service Company of New Hampshire Common Shares	Public Service Company of New Hampshire Capital Surplus, Paid In	Public Service Company of New Hampshire Retained Earnings	Public Service Company of New Hampshire Retained Earnings Adoption of New Accounting Standard	Public Service Company of New Hampshire Accumulated Other Comprehensive (Loss)/Income
Balance (in shares) at Dec. 31, 2019			329,880,645								6,035,205							200							301
Balance at Dec. 31, 2019	$ 12,629,994	$ (1,514)	$ 1,729,292	$ 7,087,768	$ 4,177,048	$ (1,514)	$ (65,059)	$ (299,055)	$ 4,387,825	$ (900)	$ 60,352	$ 2,535,765	$ 1,791,392	$ (900)	$ 316	$ 4,159,884	$ (161)	$ 0	$ 1,813,442	$ 2,346,287	$ (161)	$ 155	$ 1,391,733	$ (300)	$ 0	$ 903,134	$ 490,306	$ (300)	$ (1,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	336,633				336,633				118,738				118,738			100,390				100,390			39,601				39,601
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(187,462)				(187,462)				(69,500)				(69,500)			(196,500)				(196,500)			(22,300)				(22,300)
Issuance of Common Shares (in shares)			5,960,000
Issuance of Common Shares	432,100		$ 29,800	402,300
Long-Term Incentive Plan Activity	(15,295)			(15,295)
Issuance of Treasury Shares (in shares)			570,542
Issuance of Treasury Shares	27,746			17,230				10,516
Capital Stock Expense	(12,314)			(12,314)
Other Comprehensive Income (Loss)	1,948						1,948		(1)						(1)	67						67	278						278
Balance (in shares) at Mar. 31, 2020			336,411,187								6,035,205							200							301
Balance at Mar. 31, 2020	13,209,956		$ 1,759,092	7,479,689	4,322,825		(63,111)	(288,539)	4,434,772		$ 60,352	2,535,765	1,838,340		315	4,063,190		$ 0	1,813,442	2,249,526		222	1,409,012		$ 0	903,134	507,307		(1,429)
Balance (in shares) at Dec. 31, 2019			329,880,645								6,035,205							200							301
Balance at Dec. 31, 2019	12,629,994	$ (1,514)	$ 1,729,292	7,087,768	4,177,048	$ (1,514)	(65,059)	(299,055)	4,387,825	$ (900)	$ 60,352	2,535,765	1,791,392	$ (900)	316	4,159,884	$ (161)	$ 0	1,813,442	2,346,287	$ (161)	155	1,391,733	$ (300)	$ 0	903,134	490,306	$ (300)	(1,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	938,883								356,106							363,585							118,384
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income (Loss)	4,662								(9)							200							823
Balance (in shares) at Sep. 30, 2020			342,797,473								6,035,205							200							301
Balance at Sep. 30, 2020	13,980,017		$ 1,789,092	7,996,976	4,535,860		(60,397)	(281,514)	4,794,352		$ 60,352	2,660,765	2,072,928		307	4,325,539		$ 0	1,813,442	2,511,742		355	1,488,340		$ 0	903,134	586,090		(884)
Balance (in shares) at Mar. 31, 2020			336,411,187								6,035,205							200							301
Balance at Mar. 31, 2020	13,209,956		$ 1,759,092	7,479,689	4,322,825		(63,111)	(288,539)	4,434,772		$ 60,352	2,535,765	1,838,340		315	4,063,190		$ 0	1,813,442	2,249,526		222	1,409,012		$ 0	903,134	507,307		(1,429)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	254,112				254,112				117,271				117,271			97,468				97,468			31,632				31,632
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(190,964)				(190,964)
Issuance of Common Shares (in shares)			6,000,000
Issuance of Common Shares	517,560		$ 30,000	487,560
Long-Term Incentive Plan Activity	7,694			7,694
Issuance of Treasury Shares (in shares)			216,675
Issuance of Treasury Shares	16,548			12,524				4,024
Capital Stock Expense	(8,321)			(8,321)
Other Comprehensive Income (Loss)	553						553		3						3	68						68	285						285
Balance (in shares) at Jun. 30, 2020			342,627,862								6,035,205							200							301
Balance at Jun. 30, 2020	13,805,258		$ 1,789,092	7,979,146	4,384,093		(62,558)	(284,515)	4,550,656		$ 60,352	2,535,765	1,954,221		318	4,160,236		$ 0	1,813,442	2,346,504		290	1,440,929		$ 0	903,134	538,939		(1,144)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	348,140				348,140				120,097				120,097			165,728				165,728			47,151				47,151
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(194,493)				(194,493)
Capital Contributions from Eversource Parent									125,000			125,000
Long-Term Incentive Plan Activity	6,921			6,921
Issuance of Treasury Shares (in shares)			169,611
Issuance of Treasury Shares	13,910			10,909				3,001
Other Comprehensive Income (Loss)	2,161						2,161		(11)						(11)	65						65	260						260
Balance (in shares) at Sep. 30, 2020			342,797,473								6,035,205							200							301
Balance at Sep. 30, 2020	$ 13,980,017		$ 1,789,092	7,996,976	4,535,860		(60,397)	(281,514)	4,794,352		$ 60,352	2,660,765	2,072,928		307	4,325,539		$ 0	1,813,442	2,511,742		355	1,488,340		$ 0	903,134	586,090		(884)
Balance (in shares) at Dec. 31, 2020	342,954,023		342,954,023								6,035,205							200							301
Balance at Dec. 31, 2020	$ 14,063,566		$ 1,789,092	8,015,663	4,613,201		(76,411)	(277,979)	5,044,786		$ 60,352	2,810,765	2,173,367		302	4,521,418		$ 0	1,993,942	2,527,167		309	1,542,539		$ 0	928,134	615,018		(613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	368,023				368,023				98,398				98,398			93,924				93,924			44,676				44,676
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(206,913)				(206,913)				(70,100)				(70,100)			(206,400)				(206,400)			(25,200)				(25,200)
Long-Term Incentive Plan Activity	(15,727)			(15,727)
Issuance of Treasury Shares (in shares)			480,275
Issuance of Treasury Shares	25,163			16,182				8,981
Other Comprehensive Income (Loss)	1,188						1,188		(32)						(32)	61						61	255						255
Balance (in shares) at Mar. 31, 2021			343,434,298								6,035,205							200							301
Balance at Mar. 31, 2021	$ 14,233,420		$ 1,789,092	8,016,118	4,772,431		(75,223)	(268,998)	5,071,662		$ 60,352	2,810,765	2,200,275		270	4,408,513		$ 0	1,993,942	2,414,201		370	1,562,270		$ 0	928,134	634,494		(358)
Balance (in shares) at Dec. 31, 2020	342,954,023		342,954,023								6,035,205							200							301
Balance at Dec. 31, 2020	$ 14,063,566		$ 1,789,092	8,015,663	4,613,201		(76,411)	(277,979)	5,044,786		$ 60,352	2,810,765	2,173,367		302	4,521,418		$ 0	1,993,942	2,527,167		309	1,542,539		$ 0	928,134	615,018		(613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	919,468								284,107							382,287							123,452
Dividends on Preferred Stock	(5,600)
Other Comprehensive Income (Loss)	$ 4,546								(38)							166							640
Balance (in shares) at Sep. 30, 2021	343,774,324		343,774,324								6,035,205							200							301
Balance at Sep. 30, 2021	$ 14,411,611		$ 1,789,092	8,050,872	4,906,151		(71,865)	(262,639)	5,114,385		$ 60,352	2,810,765	2,243,004		264	4,679,201		$ 0	2,053,942	2,624,784		475	1,591,031		$ 0	1,088,134	502,870		27
Balance (in shares) at Mar. 31, 2021			343,434,298								6,035,205							200							301
Balance at Mar. 31, 2021	14,233,420		$ 1,789,092	8,016,118	4,772,431		(75,223)	(268,998)	5,071,662		$ 60,352	2,810,765	2,200,275		270	4,408,513		$ 0	1,993,942	2,414,201		370	1,562,270		$ 0	928,134	634,494		(358)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	266,400				266,400				115,556				115,556			110,912				110,912			34,633				34,633
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(206,893)				(206,893)				(70,100)				(70,100)			(76,800)				(76,800)			(185,200)				(185,200)
Capital Contributions from Eversource Parent																60,000			60,000				160,000			160,000
Long-Term Incentive Plan Activity	6,162			6,162
Issuance of Treasury Shares (in shares)			166,805
Issuance of Treasury Shares	13,799			10,679				3,120
Other Comprehensive Income (Loss)	881						881		3						3	141						141	282						282
Balance (in shares) at Jun. 30, 2021			343,601,103								6,035,205							200							301
Balance at Jun. 30, 2021	14,311,889		$ 1,789,092	8,032,959	4,830,058		(74,342)	(265,878)	5,115,731		$ 60,352	2,810,765	2,244,341		273	4,502,276		$ 0	2,053,942	2,447,823		511	1,571,985		$ 0	1,088,134	483,927		(76)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	285,046				285,046				70,153				70,153			177,451				177,451			44,143				44,143
Dividends on Preferred Stock	(1,880)				(1,880)				(1,390)				(1,390)			(490)				(490)
Dividends on Common Stock	(207,073)				(207,073)				(70,100)				(70,100)										(25,200)				(25,200)
Long-Term Incentive Plan Activity	6,478			6,478
Issuance of Treasury Shares (in shares)			173,221
Issuance of Treasury Shares	14,674			11,435				3,239
Other Comprehensive Income (Loss)	$ 2,477						2,477		(9)						(9)	(36)						(36)	103						103
Balance (in shares) at Sep. 30, 2021	343,774,324		343,774,324								6,035,205							200							301
Balance at Sep. 30, 2021	$ 14,411,611		$ 1,789,092	$ 8,050,872	$ 4,906,151		$ (71,865)	$ (262,639)	$ 5,114,385		$ 60,352	$ 2,810,765	$ 2,243,004		$ 264	$ 4,679,201		$ 0	$ 2,053,942	$ 2,624,784		$ 475	$ 1,591,031		$ 0	$ 1,088,134	$ 502,870		$ 27

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CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends on Common Shares (in dollars per share)	$ 0.6025	$ 0.6025	$ 0.6025	$ 0.5675	$ 0.5675	$ 0.5675
Par value (in dollars per share)	$ 5				$ 5	$ 5

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CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net Income	$ 919,468	$ 938,883
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	822,197	721,179
Deferred Income Taxes	191,346	156,795
Uncollectible Expense	39,690	31,101
Pension, SERP and PBOP (Income)/Expense, Net	(10,882)	9,153
Pension and PBOP Contributions	(140,000)	(107,985)
Regulatory Over/(Under) Recoveries, Net	87,455	(29,287)
Charges at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	103,583	0
Amortization	158,860	130,687
Other	(229,878)	(69,216)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(158,205)	(193,895)
Fuel, Materials, Supplies and REC Inventory	48,312	21,102
Taxes Receivable/Accrued, Net	44,003	89,759
Accounts Payable	(258,509)	(121,034)
Other Current Assets and Liabilities, Net	(97,167)	(81,033)
Net Cash Flows Provided by Operating Activities	1,520,273	1,496,209
Investing Activities:
Investments in Property, Plant and Equipment	(2,211,136)	(2,101,564)
Proceeds from Sales of Marketable Securities	334,619	386,712
Purchases of Marketable Securities	(313,961)	(391,368)
Proceeds from the Sale of Hingham Water System	0	110,536
Investments in Unconsolidated Affiliates, Net	(245,245)	(31,677)
Other Investing Activities	17,436	17,647
Net Cash Flows Used in Investing Activities	(2,418,287)	(2,009,714)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	0	929,025
Cash Dividends on Common Shares	(603,611)	(555,655)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Decrease in Notes Payable	(458,325)	(1,174,870)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Issuance of Long-Term Debt	3,150,000	2,360,000
Retirement of Long-Term Debt	(1,142,500)	(302,236)
Other Financing Activities	(45,522)	18,030
Net Cash Flows (Used in)/Provided by Financing Activities	851,193	1,225,445
Net (Decrease)/Increase in Cash and Restricted Cash	(46,821)	711,940
Cash and Restricted Cash - Beginning of Period	264,950	117,063
Cash and Restricted Cash - End of Period	218,129	829,003
The Connecticut Light and Power Company
Operating Activities:
Net Income	284,107	356,106
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	253,132	238,735
Deferred Income Taxes	77,147	92,590
Uncollectible Expense	10,183	10,013
Pension, SERP and PBOP (Income)/Expense, Net	4,478	8,629
Pension and PBOP Contributions	(78,913)	(23,200)
Regulatory Over/(Under) Recoveries, Net	(19,404)	(32,051)
Charges at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	103,583	0
Amortization of Regulatory Assets, Net	76,637	37,215
Other	(74,179)	(63,525)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(165,423)	(153,464)
Taxes Receivable/Accrued, Net	45,762	(1,515)
Accounts Payable	(54,226)	(1,976)
Other Current Assets and Liabilities, Net	(12,315)	(68,316)
Net Cash Flows Provided by Operating Activities	450,569	399,241
Investing Activities:
Investments in Property, Plant and Equipment	(563,234)	(609,690)
Other Investing Activities	251	496
Net Cash Flows Used in Investing Activities	(562,983)	(609,194)
Financing Activities:
Cash Dividends on Common Shares	(210,300)	(69,500)
Cash Dividends on Preferred Stock	(4,169)	(4,169)
Issuance of Long-Term Debt	425,000	0
Retirement of Long-Term Debt	(120,500)	0
Capital Contributions from Eversource Parent	0	125,000
Increase in Notes Payable to Eversource Parent	0	172,100
Other Financing Activities	(5,664)	(1,214)
Net Cash Flows (Used in)/Provided by Financing Activities	84,367	222,217
Net (Decrease)/Increase in Cash and Restricted Cash	(28,047)	12,264
Cash and Restricted Cash - Beginning of Period	99,809	4,971
Cash and Restricted Cash - End of Period	71,762	17,235
NSTAR Electric Company
Operating Activities:
Net Income	382,287	363,585
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	251,530	238,232
Deferred Income Taxes	12,905	13,436
Uncollectible Expense	12,477	11,321
Pension, SERP and PBOP Income, Net	(19,627)	(13,714)
Pension and PBOP Contributions	(10,000)	(650)
Regulatory Over/(Under) Recoveries, Net	86,111	(20,047)
Amortization of Regulatory Assets, Net	23,963	69,139
Other	(71,005)	(25,508)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(110,336)	(104,528)
Fuel, Materials, Supplies and REC Inventory	50,227	27,709
Taxes Receivable/Accrued, Net	109,561	55,405
Accounts Payable	(85,431)	(57,300)
Other Current Assets and Liabilities, Net	(15,322)	(54,481)
Net Cash Flows Provided by Operating Activities	617,340	502,599
Investing Activities:
Investments in Property, Plant and Equipment	(675,245)	(655,039)
Other Investing Activities	70	138
Net Cash Flows Used in Investing Activities	(675,175)	(654,901)
Financing Activities:
Cash Dividends on Common Shares	(283,200)	(196,500)
Cash Dividends on Preferred Stock	(1,470)	(1,470)
Increase in Notes Payable to Eversource Parent	3,300	6,300
Decrease in Notes Payable	(57,000)	50,000
Issuance of Long-Term Debt	600,000	400,000
Retirement of Long-Term Debt	(250,000)	(95,000)
Capital Contributions from Eversource Parent	60,000	0
Other Financing Activities	(10,367)	(4,931)
Net Cash Flows (Used in)/Provided by Financing Activities	61,263	158,399
Net (Decrease)/Increase in Cash and Restricted Cash	3,428	6,097
Cash and Restricted Cash - Beginning of Period	17,410	6,312
Cash and Restricted Cash - End of Period	20,838	12,409
Public Service Company of New Hampshire
Operating Activities:
Net Income	123,452	118,384
Adjustments to Reconcile Net Income to Net Cash Flows Provided by Operating Activities:
Depreciation	89,462	74,494
Deferred Income Taxes	(13,385)	13,959
Uncollectible Expense	4,381	2,058
Pension, SERP and PBOP (Income)/Expense, Net	(2,664)	(894)
Pension Contributions	0	(19,500)
Regulatory Over/(Under) Recoveries, Net	29,029	(22,203)
Amortization of Regulatory Assets, Net	62,744	39,034
Other	(22,738)	(7,545)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(25,607)	(24,562)
Fuel, Materials, Supplies and REC Inventory	2,040	(301)
Taxes Receivable/Accrued, Net	22,286	1,313
Accounts Payable	(42,654)	(29,388)
Other Current Assets and Liabilities, Net	10,826	4,363
Net Cash Flows Provided by Operating Activities	237,172	149,212
Investing Activities:
Investments in Property, Plant and Equipment	(217,414)	(248,899)
Other Investing Activities	431	1,969
Net Cash Flows Used in Investing Activities	(216,983)	(246,930)
Financing Activities:
Cash Dividends on Common Shares	(235,600)	(22,300)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Issuance of Long-Term Debt	350,000	150,000
Retirement of Long-Term Debt	(282,000)	0
Capital Contributions from Eversource Parent	160,000	0
Increase in Notes Payable to Eversource Parent	20,200	2,100
Other Financing Activities	(2,961)	(2,965)
Net Cash Flows (Used in)/Provided by Financing Activities	(33,571)	83,625
Net (Decrease)/Increase in Cash and Restricted Cash	(13,382)	(14,093)
Cash and Restricted Cash - Beginning of Period	39,555	36,688
Cash and Restricted Cash - End of Period	$ 26,173	$ 22,595

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A.    Basis of Presentation

Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business.  Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and Eversource Gas Company of Massachusetts (EGMA) (natural gas utilities) and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.3 million electric, natural gas and water customers through nine regulated utilities in Connecticut, Massachusetts and New Hampshire.

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

The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC.  Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations.  The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2020 Form 10-K, which was filed with the SEC on February 17, 2021. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.

The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of September 30, 2021 and December 31, 2020, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020. The results of operations and comprehensive income for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020 are not necessarily indicative of the results expected for a full year.  

Eversource's consolidated financial information includes the results of the acquisition of the assets of Columbia Gas of Massachusetts (CMA) on October 9, 2020. The natural gas distribution assets acquired from CMA on October 9, 2020 were assigned to EGMA.

Eversource consolidates the operations of CYAPC and YAEC, both of which are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent.  Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements.

Eversource holds several equity ownership interests that are not consolidated and are accounted for under the equity method.

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

COVID-19 has adversely affected customers, workers and the U.S. economy. We provide a critical service to our customers and have taken extensive measures to maintain its safety and reliability. We continue to address the impacts of the COVID-19 pandemic and how the related developments affect Eversource. We are in the re-entry phase of our pandemic response plan, in which the majority of our employees under remote work arrangements have transitioned back to the workplace. We have not experienced significant impacts directly related to the pandemic that have materially affected our current operations, our workforce, or results of operations. The extent of the impact to us in the future will vary, and depend on the duration, scope and severity of the pandemic and the resulting impact on economic, health care and capital market conditions. The future impact will also depend on the outcome of future proceedings before our state regulatory commissions to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses.

Based on the status of our COVID-19 regulatory dockets, communications with our state regulatory commissions, and policies and practices in the jurisdictions in which we operate, we believe our state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses, while balancing the impact on our customers’ bills and our operating cash flows. See Note 1C, "Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts," for discussion of our evaluation of the allowance for doubtful accounts as of September 30, 2021 in light of the COVID-19 pandemic and Note 2, "Regulatory Accounting," for the amount of net incremental COVID-19 costs deferred on our balance sheets.

Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.

B.    Accounting Standards

Accounting Standards Recently Adopted: On January 1, 2021, the Company adopted Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes, which eliminates certain exceptions to the general principles of current income tax guidance in ASC 740 and simplifies and improves consistency in application of that income tax guidance through clarifications of and amendments to ASC 740. The ASU did not have a material impact on the financial statements of Eversource, CL&P, NSTAR Electric and PSNH.

C.    Allowance for Uncollectible Accounts

Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts).

Receivables are presented net of expected credit losses at estimated net realizable value by maintaining an allowance for uncollectible accounts. The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded.

The allowance for uncollectible accounts is determined based upon a variety of judgments and factors, including the application of an estimated uncollectible percentage to each receivable aging category.  Factors in determining credit loss include historical collection, write-off experience, and management's assessment of collectability from customers, including current conditions, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic indicators, collection efforts and other factors.  Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible.

As of September 30, 2021, management evaluated the adequacy of the allowance for uncollectible accounts in light of the COVID-19 pandemic and the related economic downturn. This evaluation included an analysis of collection and customer payment trends, economic conditions, delinquency statistics, aging-based quantitative assessments, the impact on residential customer bills because of energy usage and change in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, and COVID-19 developments, including any potential federal governmental pandemic relief programs and the expansion of unemployment benefit initiatives, which help to mitigate the potential for increasing customer account delinquencies. Additionally, management considered past economic declines and corresponding uncollectible reserves as part of the current assessment.

This evaluation has shown that our operating companies have experienced an increase in aged receivables and lower cash collections from customers because of the length of the moratorium on disconnections in Connecticut and Massachusetts, and the economic slowdown resulting from the COVID-19 pandemic. In Connecticut, the moratorium on disconnections of commercial and non-hardship residential customers ended in June 2021 and September 2021, respectively, but is still in place for hardship residential customers. In Massachusetts, the moratorium on disconnections of commercial customers and residential customers ended in September 2020 and July 2021, respectively. Disconnection activities have resumed after these moratoria have expired, which has resulted in recent improved collection experience and more customers applying for, and receiving, hardship status. On July 7, 2021, the NHPUC issued an order to New Hampshire utilities that concluded that recovery of incremental bad debt or waived late fees related to the COVID-19 pandemic would be addressed in a future rate case to the extent those costs are relevant at that time. As a result of the order, in the first nine months of 2021, PSNH removed its $0.6 million deferral of net incremental COVID-19 costs. In New Hampshire, the moratorium on disconnections of non-hardship residential and commercial customers ended in late 2020 and for hardship residential customers ended in May 2021 and PSNH has resumed disconnection activities, which has resulted in improved collection of outstanding customer receivable balances.

Based upon the evaluation performed, in the first nine months of 2021, management increased the allowance for uncollectible accounts for amounts incurred as a result of COVID-19 by $25.8 million for Eversource (increase of $16.3 million for CL&P and $12.5 million at our natural gas businesses, and decrease of $1.8 million at NSTAR Electric). In the third quarter of 2021, the COVID-19 related allowance for uncollectible accounts decreased by $6.5 million at Eversource (increased $4.0 million at CL&P, and decreased $8.3 million at NSTAR Electric and $2.2 million at our natural gas businesses). The COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs at our Connecticut and Massachusetts utilities or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. As of September 30, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $57.0 million at Eversource ($20.1 million at CL&P, $8.5 million at NSTAR Electric, and $27.4 million at our natural gas businesses).

Management concluded that the reserve balance as of September 30, 2021 adequately reflected the collection risk and net realizable value for Eversource’s receivables. Management will continue to evaluate the adequacy of the uncollectible allowance in future reporting periods based on an ongoing assessment of accounts receivable collections, delinquency statistics, and analysis of aging-based quantitative assessments.

The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively.  The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance.

The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets. The activity in the allowance for uncollectible accounts by portfolio segment as of September 30th is as follows:

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2021
Beginning Balance	$	210.7	$	215.1	$	425.8	$	145.6	$	43.2	$	188.8	$	35.9	$	62.1	$	98.0	$	17.2
Uncollectible Expense	—		12.0		12.0		—		3.6		3.6		—		5.1		5.1		1.2
Uncollectible Costs Deferred (1)	22.8		1.7		24.5		4.5		5.7		10.2		11.8		(3.5)		8.3		1.2
Write-Offs	(3.9)		(20.5)		(24.4)		(3.5)		(5.4)		(8.9)		(0.1)		(7.4)		(7.5)		(2.8)
Recoveries Collected	0.3		3.5		3.8		0.2		1.6		1.8		—		1.1		1.1		0.2
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0
Nine Months Ended 2021
Beginning Balance	$	194.8	$	164.1	$	358.9	$	129.1	$	28.3	$	157.4	$	39.7	$	51.9	$	91.6	$	17.2
Uncollectible Expense	—		39.7		39.7		—		10.2		10.2		—		12.5		12.5		4.4
Uncollectible Costs Deferred (1)	44.8		53.3		98.1		25.7		21.4		47.1		8.3		11.8		20.1		2.0
Write-Offs	(10.6)		(55.2)		(65.8)		(8.7)		(14.8)		(23.5)		(0.4)		(22.6)		(23.0)		(7.3)
Recoveries Collected	0.9		9.9		10.8		0.7		3.6		4.3		—		3.8		3.8		0.7
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2020
Beginning Balance	$	175.5	$	94.5	$	270.0	$	116.3	$	20.4	$	136.7	$	34.6	$	34.1	$	68.7	$	11.8
Uncollectible Expense	—		10.5		10.5		—		3.8		3.8		—		4.5		4.5		0.8
Uncollectible Costs Deferred (1)	10.1		20.4		30.5		11.2		4.9		16.1		(1.3)		10.4		9.1		3.2
Write-Offs	(7.3)		(11.8)		(19.1)		(2.6)		(4.6)		(7.2)		(0.2)		(6.3)		(6.5)		(2.0)
Recoveries Collected	0.4		2.7		3.1		0.3		1.1		1.4		—		1.0		1.0		0.2
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0
Nine Months Ended 2020
Beginning Balance	$	143.3	$	81.5	$	224.8	$	80.1	$	17.2	$	97.3	$	43.9	$	31.5	$	75.4	$	10.5
ASU 2016-13 Implementation   Impact on January 1, 2020	21.6		2.2		23.8		21.3		0.9		22.2		(1.6)		0.3		(1.3)		0.3
Uncollectible Expense	—		31.1		31.1		—		10.0		10.0		—		11.3		11.3		2.1
Uncollectible Costs Deferred (1)	24.9		41.5		66.4		32.7		8.3		41.0		(8.4)		17.3		8.9		5.6
Write-Offs	(12.3)		(49.3)		(61.6)		(10.0)		(14.0)		(24.0)		(0.8)		(20.5)		(21.3)		(5.0)
Recoveries Collected	1.2		9.3		10.5		1.1		3.2		4.3		—		3.8		3.8		0.5
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0

(1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to COVID-19 and uncollectible energy supply costs.

D.    Fair Value Measurements

Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to the marketable securities held in trusts.  Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, and AROs, and in the valuation of the acquisition of CMA's assets in 2020. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs.

Fair Value Hierarchy:  In measuring fair value, Eversource uses observable market data when available in order to minimize 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.  Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The 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.  

Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy.

Determination of Fair Value:  The valuation techniques and inputs used in Eversource'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 financial statements.

E.    Other Income, Net

The components of Other Income, Net on the statements of income were as follows:

	For the Three Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	21.7	$	4.2	$	10.1	$	2.5	$	11.0	$	0.9	$	7.2	$	1.8
AFUDC Equity	10.3		1.7		6.2		0.3		10.3		3.5		5.5		0.9
Equity in Earnings of Unconsolidated Affiliates (1)	4.9		—		0.1		—		3.9		—		0.1		—
Investment (Loss)/Income	(0.6)		(0.3)		(0.2)		(0.1)		1.0		1.3		(0.2)		0.2
Interest Income	7.3		1.3		3.9		0.4		1.5		0.2		0.1		1.2
Gain on Sale of Property	—		—		—		—		1.5		—		—		—
Other	0.2		—		0.1		0.1		—		—		0.1		—
Total Other Income, Net	$	43.8	$	6.9	$	20.2	$	3.2	$	29.2	$	5.9	$	12.8	$	4.1
	For the Nine Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	63.9	$	11.2	$	30.3	$	7.9	$	34.3	$	3.0	$	22.2	$	5.2
AFUDC Equity	28.7		5.1		18.6		1.2		31.8		11.4		15.8		3.5
Equity in Earnings of Unconsolidated Affiliates (1)	13.3		—		0.3		—		13.8		—		0.4		—
Investment Income/(Loss)	0.7		1.2		0.6		0.3		(1.5)		—		(1.5)		0.1
Interest Income	17.2		4.1		8.8		2.0		3.3		1.8		0.7		2.0
Gain on Sale of Property	0.1		—		—		0.1		1.8		—		0.3		—
Other	0.7		0.1		0.3		0.1		0.1		0.1		0.3		0.1
Total Other Income, Net	$	124.6	$	21.7	$	58.9	$	11.6	$	83.6	$	16.3	$	38.2	$	10.9

(1)    Equity in earnings of unconsolidated affiliates includes $2.1 million of pre-tax unrealized gains associated with an investment in a renewable energy fund for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, equity in earnings of unconsolidated affiliates included $2.4 million of primarily realized gains associated with this investment.

F.    Other Taxes

Eversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:

	For the Three Months Ended				For the Nine Months Ended
(Millions of Dollars)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Eversource	$	49.4	$	48.4	$	137.9	$	129.1
CL&P	46.1		45.6		120.7		114.2

As agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income. 

G.    Supplemental Cash Flow Information

Non-cash investing activities include plant additions included in Accounts Payable as follows:

(Millions of Dollars)	As of September 30, 2021		As of September 30, 2020
Eversource	$	359.6	$	357.4
CL&P	75.3		97.8
NSTAR Electric	94.2		92.6
PSNH	32.8		50.0

The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Cash as reported on the Balance Sheets	$	88.2	$	62.8	$	3.5	$	3.9	$	106.6	$	90.8	$	0.1	$	0.1
Restricted cash included in:
Special Deposits	55.5		8.7		17.2		18.6		73.6		8.7		17.2		36.8
Marketable Securities	29.7		0.3		0.1		0.5		41.2		0.3		0.1		0.6
Other Long-Term Assets	44.7		—		—		3.2		43.6		—		—		2.1
Cash and Restricted Cash as reported on the     Statements of Cash Flows	$	218.1	$	71.8	$	20.8	$	26.2	$	265.0	$	99.8	$	17.4	$	39.6

Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, and CYAPC and YAEC cash balances. Special Deposits are included in Current Assets on the balance sheets. Restricted cash included in Marketable Securities represents money market funds held in trusts to fund certain non-qualified executive benefits and restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations. Restricted cash included in Other Long-Term Assets includes $41.5 million related to an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley, and an additional energy efficiency program established under the terms of the EGMA settlement agreement.

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REGULATORY ACCOUNTING

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

REGULATORY ACCOUNTING

REGULATORY ACCOUNTING

Eversource's utility companies are subject to rate regulation that is based on cost recovery and meets the criteria for application of accounting guidance for rate-regulated operations, which considers the effect of regulation on the timing of the recognition of certain revenues and expenses. The regulated companies' financial statements reflect the effects of the rate-making process.  The rates charged to the customers of Eversource's regulated companies are designed to collect each company's costs to provide service, plus a return on investment.

The application of accounting guidance for rate-regulated enterprises results in recording regulatory assets and liabilities. Regulatory assets represent the deferral of incurred costs that are probable of future recovery in customer rates. Regulatory assets are amortized as the incurred costs are recovered through customer rates. Regulatory liabilities represent either revenues received from customers to fund expected costs that have not yet been incurred or probable future refunds to customers.

Management believes it is probable that each of the regulated companies will recover its respective investments in long-lived assets and the regulatory assets that have been recorded.  If management were to determine that it could no longer apply the accounting guidance applicable to rate-regulated enterprises, or if management could not conclude it is probable that costs would be recovered from customers in future rates, the applicable costs would be charged to net income in the period in which the determination is made.

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

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Benefit Costs	$	2,566.1	$	540.2	$	638.4	$	249.7	$	2,794.2	$	632.3	$	690.0	$	267.6
Income Taxes, Net	756.4		458.1		113.8		18.7		747.1		458.9		110.4		15.2
Securitized Stranded Costs	489.7		—		—		489.7		522.1		—		—		522.1
Storm Restoration Costs, Net	944.2		674.2		198.1		71.9		765.6		515.1		186.4		64.1
Regulatory Tracker Mechanisms	883.0		304.6		320.0		76.8		850.5		246.6		332.2		95.3
Derivative Liabilities	265.3		265.3		—		—		296.3		293.1		—		—
Goodwill-related	302.0		—		259.3		—		314.7		—		270.2		—
Asset Retirement Obligations	121.6		33.7		57.8		4.0		118.4		32.1		58.6		3.9
Other Regulatory Assets	146.9		31.0		48.7		16.9		161.0		33.7		56.1		20.9
Total Regulatory Assets	6,475.2		2,307.1		1,636.1		927.7		6,569.9		2,211.8		1,703.9		989.1
Less:  Current Portion	1,016.3		325.3		388.4		97.9		1,076.6		345.6		399.9		115.9
Total Long-Term Regulatory Assets	$	5,458.9	$	1,981.8	$	1,247.7	$	829.8	$	5,493.3	$	1,866.2	$	1,304.0	$	873.2

CL&P Deferred Storm Costs: In 2021 and 2020, multiple tropical and severe storms caused extensive damage to CL&P’s electric distribution systems and customer outages, along with significant pre-staging costs. These storms resulted in deferred pre-staging and storm restoration costs of $195 million for 2021 storms and $344 million for 2020 storms, including the catastrophic impact of Tropical Storm Isaias in August 2020, among others. Management believes all these storm costs were prudently incurred and meet the criteria for specific cost recovery.

Regulatory Costs in Long-Term Assets:  Eversource's regulated companies had $260.6 million (including $111.2 million for CL&P, $85.1 million for NSTAR Electric and $3.2 million for PSNH) and $196.9 million (including $84.1 million for CL&P, $69.8 million for NSTAR Electric and $4.3 million for PSNH) of additional regulatory costs as of September 30, 2021 and December 31, 2020, respectively, that were included in long-term assets on the balance sheets.  These amounts represent incurred costs for which recovery has not yet been specifically approved by the applicable regulatory agency.  However, based on regulatory policies or past precedent on similar costs, management believes it is probable that these costs will ultimately be approved and recovered from customers in rates.

As of September 30, 2021 and December 31, 2020, these regulatory costs included net incremental COVID-19 related costs deferred of $41.3 million and $24.0 million at Eversource, respectively, of which, $34.5 million and $15.8 million, respectively, related to non-tracked uncollectible expense and the remainder related to facilities and fleet cleaning, sanitizing costs and supplies for personal protective equipment. Net incremental COVID-19 related costs deferred at CL&P and NSTAR Electric totaled $15.9 million and $10.9 million, respectively, as of September 30, 2021, and $4.7 million and $11.9 million, respectively, as of December 31, 2020, and primarily related to deferred non-tracked uncollectible expense.

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

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,737.1	$	1,001.5	$	1,025.6	$	363.9	$	2,778.6	$	1,010.7	$	1,044.0	$	371.5
Cost of Removal	676.7		117.0		384.1		19.0		624.8		98.4		363.6		12.9
Benefit Costs	65.9		—		56.5		—		83.6		—		72.5		—
Regulatory Tracker Mechanisms	484.5		208.9		180.6		87.5		366.5		148.9		139.7		47.8
AFUDC - Transmission	79.6		43.6		36.0		—		76.8		44.6		32.2		—
CL&P Settlement Agreement and Storm   Performance Penalty	103.4		103.4		—		—		—		—		—		—
Other Regulatory Liabilities	373.3		50.4		84.6		15.8		309.9		39.5		63.2		9.8
Total Regulatory Liabilities	4,520.5		1,524.8		1,767.4		486.2		4,240.2		1,342.1		1,715.2		442.0
Less:  Current Portion	612.9		311.3		205.8		96.8		389.4		137.2		164.8		58.8
Total Long-Term Regulatory Liabilities	$	3,907.6	$	1,213.5	$	1,561.6	$	389.4	$	3,850.8	$	1,204.9	$	1,550.4	$	383.2

Recent Regulatory Developments:

CL&P Tropical Storm Isaias Costs: On August 4, 2020, Tropical Storm Isaias caused catastrophic damage to our electric distribution system, which resulted in significant numbers and durations of customer outages, primarily in Connecticut. In terms of customer outages, this storm was one of the worst in CL&P’s history. PURA will investigate the prudence of costs incurred by CL&P to restore service in response to Tropical Storm Isaias. That investigation is expected to occur either in a separate proceeding not yet initiated or as part of CL&P’s next rate review proceeding. Tropical Storm Isaias resulted in deferred storm restoration costs of approximately $234 million at CL&P and $251 million at Eversource as of September 30, 2021. The estimated cost of restoration may continue to change as additional cost information becomes available and final post-storm costs are deferred or capitalized. Although PURA found that CL&P’s performance in its preparation for and response to Tropical Storm Isaias fell below applicable performance standards in certain instances, CL&P believes it will be able to present credible evidence in a future proceeding demonstrating there is no reasonably close causal connection between the alleged sub-standard performance and the storm costs incurred. While it is possible that some amount of storm costs may be disallowed by PURA in a future proceeding, any such amount cannot be estimated at this time. Eversource and CL&P continue to believe that these storm restoration costs associated with Tropical Storm Isaias were prudently incurred and meet the criteria for cost recovery; and as a result, management does not expect the storm cost review by PURA to have a material impact on the financial position or results of operations of Eversource or CL&P.

CL&P Tropical Storm Isaias Response Investigation: On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. The $28.4 million performance penalty assessed by PURA was recorded within current regulatory liabilities on CL&P’s balance sheet. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. In the third quarter of 2021, CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION

The following tables summarize property, plant and equipment by asset category:

Eversource	As of September 30, 2021		As of December 31, 2020
(Millions of Dollars)
Distribution - Electric	$	17,257.3	$	16,703.2
Distribution - Natural Gas	6,334.9		6,111.2
Transmission - Electric	12,396.2		11,954.0
Distribution - Water	1,771.1		1,743.1
Solar	200.4		201.5
Utility	37,959.9		36,713.0
Other (1)	1,430.5		1,269.0
Property, Plant and Equipment, Gross	39,390.4		37,982.0
Less:  Accumulated Depreciation
Utility	(8,830.2)		(8,476.3)
Other	(550.0)		(477.6)
Total Accumulated Depreciation	(9,380.2)		(8,953.9)
Property, Plant and Equipment, Net	30,010.2		29,028.1
Construction Work in Progress	2,456.9		1,854.4
Total Property, Plant and Equipment, Net	$	32,467.1	$	30,882.5

	As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	7,028.9	$	7,798.8	$	2,469.9	$	6,820.7	$	7,544.4	$	2,378.4
Transmission - Electric	5,707.9		4,884.0		1,805.9		5,512.0		4,701.3		1,742.4
Solar	—		200.4		—		—		201.5		—
Property, Plant and Equipment, Gross	12,736.8		12,883.2		4,275.8		12,332.7		12,447.2		4,120.8
Less:  Accumulated Depreciation	(2,574.6)		(3,220.7)		(895.4)		(2,475.4)		(3,074.1)		(848.9)
Property, Plant and Equipment, Net	10,162.2		9,662.5		3,380.4		9,857.3		9,373.1		3,271.9
Construction Work in Progress	436.6		949.2		148.7		377.3		750.0		102.4
Total Property, Plant and Equipment, Net	$	10,598.8	$	10,611.7	$	3,529.1	$	10,234.6	$	10,123.1	$	3,374.3

(1)    These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

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DERIVATIVE INSTRUMENTS

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS

The electric and natural gas companies purchase and procure energy and energy-related products, which are subject to price volatility, for their customers.  The costs associated with supplying energy to customers are recoverable from customers in future rates.  These regulated companies manage the risks associated with the price volatility of energy and energy-related products through the use of derivative and non-derivative contracts.  

Many of the derivative contracts meet the definition of, and are designated as, normal and qualify for accrual accounting under the applicable accounting guidance.  The costs and benefits of derivative contracts that meet the definition of normal are recognized in Operating Expenses on the statements of income, as applicable, as electricity or natural gas is delivered.

Derivative contracts that are not designated as normal are recorded at fair value as current or long-term Derivative Assets or Derivative Liabilities on the balance sheets.  For the electric and natural gas companies, regulatory assets or regulatory liabilities are recorded to offset the fair values of derivatives, as contract settlement amounts are recovered from, or refunded to, customers in their respective energy supply rates.  

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, on the balance sheets.  The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities:

		As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative		Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative
Current Derivative Assets:
CL&P	Level 3	$	14.4	$	(0.4)	$	14.0	$	13.7	$	(0.4)	$	13.3
Long-Term Derivative Assets:
CL&P	Level 3	51.1		(1.6)		49.5		58.7		(1.8)		56.9
Current Derivative Liabilities:
CL&P	Level 3	(72.2)		—		(72.2)		(68.8)		—		(68.8)
Other	Level 2	—		—		—		(3.3)		0.1		(3.2)
Long-Term Derivative Liabilities:
CL&P	Level 3	(256.6)		—		(256.6)		(294.5)		—		(294.5)

    

(1)    Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.

Derivative Contracts at Fair Value with Offsetting Regulatory Amounts

Commodity Supply and Price Risk Management:  As required by regulation, CL&P, along with UI, has capacity-related contracts with generation facilities.  CL&P has a sharing agreement with UI, with 80 percent of the costs or benefits of each contract borne by or allocated to CL&P and 20 percent borne by or allocated to UI.  The combined capacities of these contracts as of both September 30, 2021 and December 31, 2020 were 675 MW. The capacity contracts extend through 2026 and obligate both CL&P and UI 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 capacity market price received in the ISO-NE capacity markets. 

As of December 31, 2020, Eversource had New York Mercantile Exchange (NYMEX) financial contracts for natural gas futures in order to reduce variability associated with the price of 8.9 million MMBtu of natural gas. These contracts were classified as Level 2 in the fair value hierarchy. NSTAR Gas terminated its financial contracts swap program in April 2021.

For the three months ended September 30, 2021 and 2020, there were gains of $0.7 million and losses of $2.6 million, respectively, deferred as regulatory costs, which reflect the change in fair value associated with Eversource's derivative contracts. For the nine months ended September 30, 2021 and 2020, there were losses of $9.5 million and $20.6 million, respectively.

Fair Value Measurements of Derivative Instruments

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 valuations adjusted for assumptions related 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 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 in order to address the full term of the contract.  

Valuations of derivative contracts using a 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 Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:

	As of September 30, 2021								As of December 31, 2020
CL&P	Range				Weighted Average (1)			Period Covered	Range				Weighted Average (1)			Period Covered
Capacity Prices	$2.61				$	2.61	per kW-Month	2025 - 2026	$	4.30	—	$5.30	$	4.63	per kW-Month	2024 - 2026
Forward Reserve Prices	$	0.50	—	$1.15	$	0.82	per kW-Month	2022 - 2024	$	0.54	—	$0.90	$	0.72	per kW-Month	2021 - 2024

(1)    Unobservable inputs were weighted by the relative future capacity and forward reserve prices and contractual MWs over the periods covered.

Exit price premiums of 5.5 percent through 9.8 percent, or a weighted average of 8.7 percent, are also applied to these contracts and reflect the uncertainty and illiquidity premiums that would be required based on the most recent market activity available for similar type contracts. The risk premium was weighted by the relative fair value of the net derivative instruments.

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

The following table presents changes 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.

CL&P	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Millions of Dollars)	2021		2020		2021		2020
Derivatives, Net:
Fair Value as of Beginning of Period	$	(279.7)	$	(322.0)	$	(293.1)	$	(329.2)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets	0.7		(4.7)		(10.9)		(22.3)
Settlements	13.7		14.9		38.7		39.7
Fair Value as of End of Period	$	(265.3)	$	(311.8)	$	(265.3)	$	(311.8)

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MARKETABLE SECURITIES

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

MARKETABLE SECURITIES

MARKETABLE SECURITIES

Eversource holds marketable securities that are primarily used to fund certain non-qualified executive benefits.  The trusts that hold marketable securities are not subject to regulatory oversight by state or federal agencies.  CYAPC and YAEC maintain legally restricted trusts, each of which holds marketable securities, to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities.

Equity Securities: Unrealized gains and losses on equity securities held in Eversource's non-qualified executive benefit trust are recorded in Other Income, Net on the statements of income. The fair value of these equity securities as of September 30, 2021 and December 31, 2020 was $39.2 million and $40.9 million, respectively.  For the three months ended September 30, 2021 and 2020, there were unrealized losses of $0.5 million and unrealized gains of $1.6 million, respectively, recorded in Other Income, Net related to these equity securities. For the nine months ended September 30, 2021 and 2020, there were unrealized gains of $2.5 million and unrealized losses of $1.0 million, respectively.

Eversource's equity securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $214.9 million and $205.1 million as of September 30, 2021 and December 31, 2020, respectively.  Unrealized gains and losses for these spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to Other Long-Term Liabilities on the balance sheets, with no impact on the statements of income.

Available-for-Sale Debt Securities: The following is a summary of the available-for-sale debt securities, which are recorded at fair value and are included in current and long-term Marketable Securities on the balance sheets.

	As of September 30, 2021								As of December 31, 2020
Eversource (Millions of Dollars)	Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value		Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value
Debt Securities	$	217.5	$	8.0	$	(0.2)	$	225.3	$	213.1	$	11.2	$	(0.1)	$	224.2

Eversource's debt securities include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts in the amounts of $195.2 million and $192.5 million as of September 30, 2021 and December 31, 2020, respectively.

Unrealized gains and losses on available-for-sale debt securities held in Eversource's non-qualified benefit trust are recorded in Accumulated Other Comprehensive Income, excluding amounts related to credit losses or losses on securities intended to be sold, which are recorded in Other Income, Net. There have been no significant unrealized losses and no credit losses for the three and nine months ended September 30, 2021 and 2020, and no allowance for credit losses as of September 30, 2021. Factors considered in determining whether a credit loss exists include adverse conditions specifically affecting the issuer, the payment history, ratings and rating changes of the security, and the severity of the impairment.  For asset-backed debt securities, underlying collateral and expected future cash flows are also evaluated. Debt securities included in Eversource's non-qualified benefit trust portfolio are investment-grade bonds with a lower default risk based on their credit quality.

As of September 30, 2021, the contractual maturities of available-for-sale debt securities were as follows:

 

Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year (1)	$	30.9	$	30.9
One to five years	65.5		67.1
Six to ten years	41.8		43.9
Greater than ten years	79.3		83.4
Total Debt Securities	$	217.5	$	225.3

(1)    Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.

Realized Gains and Losses:  Realized gains and losses are recorded in Other Income, Net for Eversource's benefit trust and are offset in Other Long-Term Liabilities for CYAPC and YAEC.  Eversource utilizes the specific identification basis method for the Eversource non-qualified benefit trust, and the average cost basis method for the CYAPC and YAEC spent nuclear fuel trusts to compute the realized gains and losses on the sale of marketable securities.

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:

Eversource (Millions of Dollars)	As of September 30, 2021		As of December 31, 2020
Level 1:
Mutual Funds and Equities	$	254.1	$	246.0
Money Market Funds	29.7		41.2
Total Level 1	$	283.8	$	287.2
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	98.9	$	72.9
Corporate Debt Securities	63.4		63.8
Asset-Backed Debt Securities	13.4		11.9
Municipal Bonds	6.1		24.0
Other Fixed Income Securities	13.8		10.4
Total Level 2	$	195.6	$	183.0
Total Marketable Securities	$	479.4	$	470.2

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 instruments 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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SHORT-TERM AND LONG-TERM DEBT

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT

Short-Term Debt - Commercial Paper Programs and Credit Agreements: Eversource parent has a $2.00 billion commercial paper program allowing Eversource parent to issue commercial paper as a form of short-term debt. Eversource parent, CL&P, PSNH, NSTAR Gas, Yankee Gas, EGMA and Aquarion Water Company of Connecticut are parties to a five-year $2.00 billion revolving credit facility, which terminates on October 15, 2026. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program.  

NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility, which terminates on October 15, 2026. The revolving credit facility serves to backstop NSTAR Electric's $650 million commercial paper program.  

The amount of borrowings outstanding and available under the commercial paper programs were as follows:

	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	653.0	$	1,054.3	$	1,347.0	$	945.7	0.18	%	0.25	%
NSTAR Electric Commercial Paper Program	138.0		195.0		512.0		455.0		0.10	%	0.16	%

There were no borrowings outstanding on the revolving credit facilities as of September 30, 2021 or December 31, 2020.

CL&P and PSNH have uncommitted line of credit agreements totaling $450 million and $300 million, respectively, which will expire on May 12, 2022. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of September 30, 2021.

Amounts outstanding under the commercial paper programs are included in Notes Payable and classified in current liabilities on the Eversource and NSTAR Electric balance sheets, as all borrowings are outstanding for no more than 364 days at one time. As a result of the NSTAR Gas long-term debt issuances in October 2021, $80.0 million of commercial paper borrowings under the Eversource parent commercial paper program were classified as Long-Term Debt as of September 30, 2021.

The Company expects the future operating cash flows of Eversource, CL&P, NSTAR Electric and PSNH, along with existing borrowing availability and access to both debt and equity markets, will be sufficient to meet any working capital and future operating requirements, and capital investment forecasted opportunities.

Intercompany Borrowings: Eversource parent uses its available capital resources to provide loans to its subsidiaries to assist in meeting their short-term borrowing needs. Eversource parent records intercompany interest income from its loans to subsidiaries, which is eliminated in consolidation. Intercompany loans from Eversource parent to its subsidiaries are eliminated in consolidation on Eversource's balance sheets. As of September 30, 2021, there were intercompany loans from Eversource parent to PSNH of $66.5 million, and to a subsidiary of NSTAR Electric of $24.6 million. As of December 31, 2020, there were intercompany loans from Eversource parent to PSNH of $46.3 million, and to a subsidiary of NSTAR Electric of $21.3 million. Intercompany loans from Eversource parent are included in Notes Payable to Eversource Parent and classified in current liabilities on the respective subsidiary's balance sheets.

Availability under Long-Term Debt Issuance Authorizations: On March 31, 2021, the DPU approved NSTAR Electric's request for authorization to issue up to $1.60 billion in long-term debt through December 31, 2023. On September 10, 2021, the DPU approved EGMA’s request for authorization to issue up to $725 million in long-term debt through December 31, 2023. The remaining Eversource operating companies, including CL&P and PSNH, have utilized the long-term debt authorizations in place with the respective regulatory commissions.

Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments:

(Millions of Dollars)	Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
CL&P:
2.05% Series A First Mortgage Bonds	$	425.0	June 2021	July 2031	Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB	(120.5)		September 2021	September 2028	Paid on par call date in advance of maturity
NSTAR Electric:
3.10% 2021 Debentures	300.0		May 2021	June 2051	Refinanced investments in eligible green expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes	(250.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
1.95% 2021 Debentures	300.0		August 2021	August 2031	Repaid short-term debt, paid capital expenditures and working capital
PSNH:
4.05% Series Q First Mortgage Bonds	(122.0)		March 2021	June 2021	Paid on par call date in advance of maturity date
3.20% Series R First Mortgage Bonds	(160.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
2.20% Series V First Mortgage Bonds	350.0		June 2021	June 2031	Repaid short-term debt, including short-term debt used to redeem Series R First Mortgage Bonds, paid capital expenditures and working capital
Other:
Eversource Parent 2.50% Series I Senior Notes	(450.0)		February 2021	March 2021	Paid on par call date in advance of maturity date
Eversource Parent 2.55% Series S Senior Notes	350.0		March 2021	March 2031	Repaid short-term debt, including short-term debt used to redeem Series I Senior Notes
Eversource Parent 1.40% Series U Senior Notes	300.0		August 2021	August 2026	Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1)	350.0		August 2021	August 2023	Repaid short-term debt
Aquarion Water Company of Connecticut 3.31%    Senior Notes	100.0		April 2021	April 2051	Repaid 5.50% Notes, repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut 5.50% Notes	(40.0)		April 2021	April 2021	Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds	90.0		August 2021	August 2026	(2)
Yankee Gas 2.88% Series T First Mortgage Bonds	35.0		August 2021	August 2051	(2)
EGMA 2.11% Series A First Mortgage Bonds	310.0		September 2021	October 2031	(2)
EGMA 2.92% Series B First Mortgage Bonds	240.0		September 2021	October 2051	(2)
NSTAR Gas 2.25% Series T First Mortgage Bonds	40.0		October 2021	November 2031	(2)
NSTAR Gas 3.03% Series U First Mortgage Bonds	40.0		October 2021	November 2051	(2)

(1)    On August 10, 2021, Eversource Parent issued $350 million of floating rate Series T Senior Notes with a maturity date of August 15, 2023. The notes have a coupon rate based on the Compounded SOFR plus 0.25%.

(2)    The use of proceeds from these various issuances refinanced existing indebtedness, funded capital expenditures and were for general corporate purposes. The EGMA indebtedness that was refinanced included $309.4 million of long-term debt.

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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

9 Months Ended

Sep. 30, 2021

Rate Reduction Bonds and Variable Interest Entity [Abstract]

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES

Rate Reduction Bonds: In May 2018, PSNH Funding, a wholly-owned subsidiary of PSNH, issued $635.7 million of securitized RRBs in multiple tranches with a weighted average interest rate of 3.66 percent, and final maturity dates ranging from 2026 to 2035.  The RRBs are expected to be repaid by February 1, 2033. RRB payments consist of principal and interest and are paid semi-annually, beginning on February 1, 2019. The RRBs were issued pursuant to a finance order issued by the NHPUC in January 2018 to recover remaining costs resulting from the divestiture of PSNH’s generation assets.

PSNH Funding was formed solely to issue RRBs to finance PSNH's unrecovered remaining costs associated with the divestiture of its generation assets. PSNH Funding is considered a VIE primarily because the equity capitalization is insufficient to support its operations. PSNH has the power to direct the significant activities of the VIE and is most closely associated with the VIE as compared to other interest holders. Therefore, PSNH is considered the primary beneficiary and consolidates PSNH Funding in its consolidated financial statements.

The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements:

(Millions of Dollars)
PSNH Balance Sheets:	As of September 30, 2021		As of December 31, 2020
Restricted Cash - Current Portion (included in Current Assets)	$	18.3	$	36.8
Restricted Cash - Long-Term Portion (included in Other Long-Term Assets)	3.2		2.1
Securitized Stranded Cost (included in Regulatory Assets)	489.7		522.1
Other Regulatory Liabilities (included in Regulatory Liabilities)	8.0		9.1
Accrued Interest (included in Other Current Liabilities)	3.0		8.0
Rate Reduction Bonds - Current Portion	43.2		43.2
Rate Reduction Bonds - Long-Term Portion	453.7		496.9

(Millions of Dollars) PSNH Income Statements:	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	$	10.8	$	10.8	$	32.4	$	32.4
Interest Expense on RRB Principal (included in Interest Expense)	4.5		4.9		13.9		14.9

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

9 Months Ended

Sep. 30, 2021

Postemployment Benefits [Abstract]

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION

Eversource provides defined benefit retirement plans (Pension Plans) that cover eligible employees.  In addition to the Pension Plans, Eversource maintains non-qualified defined benefit retirement plans (SERP Plans), which provide benefits in excess of Internal Revenue Code limitations to eligible participants consisting of current and retired employees. Eversource also provides defined benefit postretirement plans (PBOP Plans) that provide life insurance and a health reimbursement arrangement created for the purpose of reimbursing retirees and dependents for health insurance premiums and certain medical expenses to eligible employees that meet certain age and service eligibility requirements.

The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets for future recovery, are shown below.  The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis.

	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2021								For the Three Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	21.5	$	5.6	$	4.0	$	2.2	$	3.3	$	0.5	$	0.6	$	0.3
Interest Cost	32.5		6.7		6.7		3.7		4.3		0.8		1.1		0.4
Expected Return on Plan Assets	(109.5)		(21.7)		(27.1)		(11.9)		(19.8)		(2.5)		(9.2)		(1.6)
Actuarial Loss	60.7		10.8		15.3		5.3		2.0		0.4		0.5		0.1
Prior Service Cost/(Credit)	0.3		—		0.1		—		(5.3)		0.3		(4.3)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	5.5	$	1.4	$	(1.0)	$	(0.7)	$	(15.5)	$	(0.5)	$	(11.3)	$	(0.7)
Intercompany Expense/(Income) Allocations	N/A		$	2.2	$	2.4	$	0.7	N/A		$	(0.4)	$	(0.5)	$	(0.2)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	64.3	$	17.4	$	11.9	$	6.6	$	10.1	$	1.7	$	1.8	$	0.9
Interest Cost	97.5		20.7		20.1		10.9		12.9		2.4		3.3		1.3
Expected Return on Plan Assets	(328.0)		(65.0)		(81.1)		(35.6)		(59.3)		(7.7)		(27.7)		(4.6)
Actuarial Loss	183.1		34.6		46.1		15.4		5.9		1.2		1.6		0.4
Prior Service Cost/(Credit)	1.1		—		0.3		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	18.0	$	7.7	$	(2.7)	$	(2.7)	$	(46.3)	$	(1.6)	$	(33.7)	$	(1.7)
Intercompany Expense/(Income) Allocations	N/A		$	5.8	$	6.4	$	1.9	N/A		$	(1.3)	$	(1.5)	$	(0.5)

	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2020								For the Three Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	18.7	$	5.4	$	3.8	$	2.0	$	2.4	$	0.4	$	0.5	$	0.2
Interest Cost	44.4		9.3		9.7		4.8		6.1		1.1		1.7		0.7
Expected Return on Plan Assets	(99.2)		(19.8)		(25.7)		(11.1)		(18.3)		(2.5)		(8.5)		(1.4)
Actuarial Loss	50.7		9.7		14.0		3.8		2.2		0.3		0.6		0.2
Prior Service Cost/(Credit)	0.2		—		—		—		(5.3)		0.3		(4.2)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	14.8	$	4.6	$	1.8	$	(0.5)	$	(12.9)	$	(0.4)	$	(9.9)	$	(0.2)
Intercompany Expense/(Income) Allocations	N/A		$	2.4	$	2.3	$	0.8	N/A		$	(0.3)	$	(0.4)	$	(0.1)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2020								For the Nine Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	57.0	$	16.5	$	11.4	$	6.2	$	7.3	$	1.3	$	1.6	$	0.6
Interest Cost	133.0		28.1		29.0		14.5		18.3		3.3		5.0		2.1
Expected Return on Plan Assets	(298.8)		(59.6)		(77.2)		(33.5)		(55.1)		(7.4)		(25.5)		(4.2)
Actuarial Loss	150.7		29.4		41.3		11.8		6.3		0.9		1.8		0.6
Prior Service Cost/(Credit)	0.8		—		0.2		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	42.7	$	14.4	$	4.7	$	(1.0)	$	(39.1)	$	(1.1)	$	(29.8)	$	(0.6)
Intercompany Expense/(Income) Allocations	N/A		$	6.7	$	6.5	$	2.2	N/A		$	(0.9)	$	(1.0)	$	(0.4)

Eversource Contributions: Eversource currently expects to make contributions of $180 million to the Pension Plans in 2021, of which $99 million and $30 million will be contributed by CL&P and NSTAR Electric, respectively.

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

A.    Environmental Matters

Eversource, CL&P, NSTAR Electric and PSNH 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. Eversource, CL&P, NSTAR Electric and PSNH have an active environmental auditing and training program and each believes it is substantially in compliance with all enacted laws and regulations.

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

	As of September 30, 2021			As of December 31, 2020
	Number of Sites	Reserve (in millions)		Number of Sites	Reserve (in millions)
Eversource	62	$	111.9	63	$	102.4
CL&P	14	12.5		15	12.3
NSTAR Electric	12	3.7		12	4.7
PSNH	9	6.4		9	7.1

The increase in the reserve balance was due primarily to a change in cost estimates at an NSTAR Gas MGP site under investigation for which we now know of additional remediation that is required.

Included in the number of sites and reserve amounts above are former MGP sites that were operated several decades ago and manufactured natural 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, for which Eversource may have potential liability.  The reserve balances related to these former MGP sites were $102.4 million and $92.2 million as of September 30, 2021 and December 31, 2020, respectively, and related primarily to the natural gas business segment.

These reserve estimates are subjective in nature as they take into consideration several different remediation options at each specific site.  The reliability and precision of these estimates can be affected by several factors, including new information concerning either the level of contamination at the site, the extent of Eversource's, CL&P's, NSTAR Electric's and PSNH's responsibility for remediation or the extent of remediation required, recently enacted laws and regulations or changes in cost estimates due to certain economic factors.  It is possible that new information or future developments could require a reassessment of the potential exposure to required environmental remediation.  As this information becomes available, management will continue to assess the potential exposure and adjust the reserves accordingly.

B.    Long-Term Contractual Arrangements

The following is an update to the current status of long-term contractual arrangements set forth in Note 13B of the Eversource 2020 Form 10-K.

Renewable Energy: Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities.

NSTAR Electric
(Millions of Dollars)	2021		2022		2023		2024		2025		Thereafter		Total
Renewable Energy	$	27.1	$	103.9	$	230.5	$	341.2	$	348.1	$	6,564.2	$	7,615.0

The table has been updated to include long-term commitments of NSTAR Electric pertaining to the Massachusetts Clean Energy 83D contract, for which construction commenced in 2021. Estimated costs under this contract are expected to begin in 2023 and range between $150 million and $415 million per year under a 20-year contract, totaling approximately $6.7 billion.

C.    Guarantees and Indemnifications

In the normal course of business, Eversource parent provides credit assurances on behalf of its subsidiaries, including CL&P, NSTAR Electric and PSNH, in the form of guarantees. Management does not anticipate a material impact to net income or cash flows as a result of these various guarantees and indemnifications. 

Guarantees issued on behalf of unconsolidated entities, including equity method offshore wind investments, for which Eversource parent is the guarantor, are recorded at fair value as a liability on the balance sheet at the inception of the guarantee. Eversource regularly reviews performance risk under these guarantee arrangements, and in the event it becomes probable that Eversource parent will be required to perform under the guarantee, the amount of probable payment will be recorded. The fair value of guarantees issued on behalf of unconsolidated entities are recorded within Other Long-Term Liabilities on the balance sheet, and was $5.7 million as of September 30, 2021.

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties:  

As of September 30, 2021
Company (Obligor)	Description	Maximum Exposure (in millions)		Expiration Dates
North East Offshore LLC	Construction-related purchase agreements with third-party contractors (1)	$	1,093.5	(1)
Eversource Investment LLC	Funding and indemnification obligations of North East Offshore LLC (2)	—		(2)
Sunrise Wind LLC	OREC capacity production (3)	2.2		(3)
Sunrise Wind LLC	Construction-related purchase agreements with third-party contractors (4)	386.4		—
South Fork Wind, LLC	Transmission interconnection	1.2		—
South Fork Wind, LLC	Construction-related purchase agreements with third-party contractors (5)	40.6		2023
Bay State Wind LLC	Real estate purchase	2.5		2022
Various	Surety bonds (6)	67.5		2021 - 2023
Rocky River Realty Company and    Eversource Service	Lease payments for real estate	4.0		2024

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contactors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 2, below. The guarantee expires upon the full performance of the guaranteed obligations.    

(2)    Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the Amended and Restated Limited Liability Company Operating Agreement of NEO, in an aggregate amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations.

(3)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed on October 23, 2019, by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations.    

(4)     Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $420.6 million, in connection with a construction-related purchase agreement. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) April 14, 2026 and (ii) full performance of the guaranteed obligations.

(5)    Eversource parent issued two guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with two construction-related purchase agreements. Under one guarantee, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $25.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 4, 2023 and (ii) full performance of the guaranteed obligations. Under the second guaranty, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $14.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 18, 2023 and (ii) full performance of the guaranteed obligations.

(6)    Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded. 

Letter of Credit: On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million.

D.     Spent Nuclear Fuel Obligations - Yankee Companies

CL&P, NSTAR Electric and PSNH have plant closure and fuel storage cost obligations to the Yankee Companies, which have each completed the physical decommissioning of their respective nuclear power facilities and are now engaged in the long-term storage of their spent fuel. The Yankee Companies fund these costs through litigation proceeds received from the DOE and, to the extent necessary, through wholesale, FERC-approved rates charged under power purchase agreements with several New England utilities, including CL&P, NSTAR Electric and PSNH. CL&P, NSTAR Electric and PSNH, in turn recover these costs from their customers through state regulatory commission-approved retail rates. The Yankee Companies collect amounts that management believes are adequate to recover the remaining plant closure and fuel storage cost estimates for the respective plants. Management believes CL&P and NSTAR Electric will recover their shares of these obligations from their customers. PSNH has recovered its total share of these costs from its customers.

Spent Nuclear Fuel Litigation:

The Yankee Companies have filed complaints against the DOE in the Court of Federal Claims seeking monetary damages resulting from the DOE's failure to accept delivery of, and provide for a permanent facility to store, spent nuclear fuel pursuant to the terms of the 1983 spent fuel and high-level waste disposal contracts between the Yankee Companies and the DOE. The court previously awarded the Yankee Companies damages for Phases I, II, III and IV of litigation resulting from the DOE's failure to meet its contractual obligations. These Phases covered damages incurred in the years 1998 through 2016, and the awarded damages have been received by the Yankee Companies with certain amounts of the damages refunded to their customers.

DOE Phase V Damages - On March 25, 2021, each of the Yankee Companies filed a fifth set of lawsuits against the DOE in the Court of Federal Claims. The Yankee Companies are calculating and will be seeking monetary damages for CYAPC, YAEC and MYAPC, resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal covering the years from 2017 to 2020 (DOE Phase V).

E.    FERC ROE Complaints

Four separate complaints were filed at the FERC by combinations of New England state attorneys general, state regulatory commissions, consumer advocates, consumer groups, municipal parties and other parties (collectively, the Complainants). In each of the first three complaints, filed on October 1, 2011, December 27, 2012, and July 31, 2014, respectively, the Complainants challenged the NETOs' base ROE of 11.14 percent that had been utilized since 2005 and sought an order to reduce it prospectively from the date of the final FERC order and for the separate 15-month complaint periods. In the fourth complaint, filed April 29, 2016, the Complainants challenged the NETOs' base ROE billed of 10.57 percent and the maximum ROE for transmission incentive (incentive cap) of 11.74 percent, asserting that these ROEs were unjust and unreasonable.

The ROE originally billed during the period October 1, 2011 (beginning of the first complaint period) through October 15, 2014 consisted of a base ROE of 11.14 percent and incentives up to 13.1 percent. On October 16, 2014, the FERC set the base ROE at 10.57 percent and the incentive cap at 11.74 percent for the first complaint period. This was also effective for all prospective billings to customers beginning October 16, 2014. This FERC order was vacated on April 14, 2017 by the U.S. Court of Appeals for the D.C. Circuit (the Court).

All amounts associated with the first complaint period have been refunded, which totaled $38.9 million (pre-tax and excluding interest) at Eversource and reflected both the base ROE and incentive cap prescribed by the FERC order. The refund consisted of $22.4 million for CL&P, $13.7 million for NSTAR Electric and $2.8 million for PSNH.

Eversource has recorded a reserve of $39.1 million (pre-tax and excluding interest) for the second complaint period as of September 30, 2021 and December 31, 2020. This reserve represents the difference between the billed rates during the second complaint period and a 10.57 percent base ROE and 11.74 percent incentive cap. The reserve consisted of $21.4 million for CL&P, $14.6 million for NSTAR Electric and $3.1 million for PSNH as of September 30, 2021 and December 31, 2020.

On October 16, 2018, FERC issued an order on all four complaints describing how it intends to address the issues that were remanded by the Court. FERC proposed a new framework to determine (1) whether an existing ROE is unjust and unreasonable and, if so, (2) how to calculate a replacement ROE. Initial briefs were filed by the NETOs, Complainants and FERC Trial Staff on January 11, 2019 and reply briefs were filed on March 8, 2019. The NETOs' brief was supportive of the overall ROE methodology determined in the October 16, 2018 order provided the FERC does not change the proposed methodology or alter its implementation in a manner that has a material impact on the results.

The FERC order included illustrative calculations for the first complaint using FERC's proposed frameworks with financial data from that complaint. Those illustrative calculations indicated that for the first complaint period, for the NETOs, which FERC concludes are of average financial risk, the preliminary just and reasonable base ROE is 10.41 percent and the preliminary incentive cap on total ROE is 13.08 percent.

If the results of the illustrative calculations were included in a final FERC order for each of the complaint periods, then a 10.41 percent base ROE and a 13.08 percent incentive cap would not have a significant impact on our financial statements for all of the complaint periods. These preliminary calculations are not binding and do not represent what we believe to be the most likely outcome of a final FERC order.

On November 21, 2019, FERC issued Opinion No. 569 affecting the two pending transmission ROE complaints against the Midcontinent ISO (MISO) transmission owners, in which FERC adopted a new methodology for determining base ROEs. Various parties sought rehearing. On December 23, 2019, the NETOs filed supplementary materials in the NETOs' four pending cases to respond to this new methodology because of the uncertainty of the applicability to the NETOs’ cases.

On May 21, 2020, the FERC issued its order in Opinion No. 569-A on the rehearing of the MISO transmission owners' cases, in which FERC again changed its methodology for determining the MISO transmission owners' base ROEs. Various parties appealed the MISO transmission owners' opinion. On November 19, 2020, the FERC issued Opinion No. 569-B denying rehearing of Opinion No. 569-A and reaffirmed the methodology previously adopted in Opinion No. 569-A. The new methodology differs significantly from the methodology proposed by FERC in its October 16, 2018 order to determine the NETOs' base ROEs in its four pending cases.

Given the significant uncertainty regarding the applicability of the FERC opinions in the MISO transmission owners' two complaint cases to the NETOs' pending four complaint cases, Eversource concluded that there is no reasonable basis for a change to the reserve or recognized ROEs for any of the complaint periods at this time. As well, Eversource cannot reasonably estimate a range of any gain or loss for any of the four complaint proceedings at this time.

Eversource, CL&P, NSTAR Electric and PSNH currently record revenues at the 10.57 percent base ROE and incentive cap at 11.74 percent established in the October 16, 2014 FERC order.

A change of 10 basis points to the base ROE used to establish the reserves would impact Eversource's after-tax earnings by an average of approximately $3 million for each of the four 15-month complaint periods.

F.    Eversource and NSTAR Electric Boston Harbor Civil Action

In 2016, the United States Attorney on behalf of the United States Army Corps of Engineers filed a civil action in the United States District Court for the District of Massachusetts against NSTAR Electric, HEEC, and the Massachusetts Water Resources Authority (together with NSTAR Electric and HEEC, the "Defendants").  The action alleged that the Defendants failed to comply with certain permitting requirements related to the placement of the HEEC-owned electric distribution cable beneath Boston Harbor.

The parties reached a settlement pursuant to which HEEC agreed to install a new 115kV distribution cable across Boston Harbor to Deer Island, utilizing a different route, and remove portions of the existing cable. Construction of the new distribution cable was completed in August 2019, and removal of the portions of the existing cable was completed in January 2020. All issues surrounding the current permit from the United States Army Corps of Engineers are expected to be resolved, and subsequently, such litigation then dismissed with prejudice.

G.    CL&P Regulatory Matters

CL&P Tropical Storm Isaias Response Investigation: In August 2020, PURA opened a docket to investigate the preparation for and response to Tropical Storm Isaias by Connecticut utilities, including CL&P. On April 28, 2021, PURA issued a final decision on CL&P’s compliance with its emergency response plan that concluded CL&P failed to comply with certain storm performance standards and was imprudent in certain instances. Specifically, PURA concluded that CL&P did not satisfy the performance standards for managing its municipal liaison program, timely removing electrical hazards from blocked roads, communicating critical information to its customers, or meeting its obligation to secure adequate external contractor and mutual aid resources in a timely manner. Based on its findings, PURA ordered CL&P to adjust its future rates in a pending or future rate proceeding to reflect a monetary penalty in the form of a downward adjustment of 90 basis points in its allowed rate of return on equity (ROE), which is currently 9.25 percent. In its decision, PURA explained that additional monetary penalties and further enforcement orders pursuant to Connecticut statute would be considered in a separate proceeding that was initiated on May 6, 2021.

On May 6, 2021, as part of the penalty proceeding, PURA issued a notice of violation that included an assessment of $30 million, consisting of a $28.4 million civil penalty for non-compliance with storm performance standards to be provided as credits on customer bills and a $1.6 million fine for violations of accident reporting requirements to be paid to the State of Connecticut’s general fund. On July 14, 2021, PURA issued a final decision in this penalty proceeding that included an assessment of $28.6 million, maintaining the $28.4 million performance penalty and reducing the $1.6 million fine for accident reporting to $0.2 million. The $28.4 million performance penalty is currently being credited to customers on electric bills beginning on September 1, 2021 over a one-year period. The $28.4 million is the maximum statutory penalty amount under applicable Connecticut law in effect at the time of Tropical Storm Isaias, which is 2.5 percent of CL&P’s annual distribution revenues. The

liability for the performance penalty was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. The after-tax earnings impact of this charge was $0.07 per share.

CL&P Settlement Agreement: On October 1, 2021, CL&P entered into a settlement agreement with the DEEP, Office of Consumer Counsel (OCC), Office of the Attorney General (AG) and the Connecticut Industrial Energy Consumers, resolving certain issues that arose in pending regulatory proceedings initiated by the PURA. PURA approved the settlement agreement on October 27, 2021. In the settlement agreement, CL&P agreed to provide a total of $65 million of customer credits to be distributed based on customer sales over a two-month period from December 1, 2021 to January 31, 2022. CL&P also agreed to irrevocably set aside $10 million to fund various customer assistance initiatives as directed by PURA for disbursement to state-designated purposes, with the objective of disbursing the funds prior to April 30, 2022, including providing credits to existing hardship and non-hardship customers carrying arrearages and other purposes. In the third quarter of 2021, CL&P recorded a current regulatory liability of $75 million on the balance sheet associated with the provisions of the settlement agreement, with a $65 million pre-tax charge as a reduction to Operating Revenues associated with the customer credits and a $10 million charge to Operations and Maintenance expense associated with the customer assistance initiatives on the three months ended September 30, 2021 income statement.

In exchange for the $75 million of customer credits and assistance, PURA’s interim rate reduction docket was resolved without findings. As a result of the settlement agreement, neither the 90 basis point reduction to CL&P’s return on equity introduced in PURA’s storm-related decision issued April 28, 2021, nor the 45 basis point reduction to CL&P’s return on equity included in PURA’s draft decision issued September 14, 2021 in the interim rate reduction docket, will be implemented.

CL&P has also agreed that its current base distribution rates shall be frozen, subject to the customer credits described above, until no earlier than January 1, 2024. The rate freeze applies only to base distribution rates (including storm costs) and not to other rate mechanisms such as the retail rate components, rate reconciling mechanisms, formula rates and any other adjustment mechanisms. The rate freeze also does not apply to any cost recovery mechanism outside of the base distribution rates with regard to grid-modernization initiatives or any other proceedings, either currently pending or that may be initiated during the rate freeze period, that may place additional obligations on CL&P. The approval of the settlement agreement satisfies the Connecticut statute of rate review requirements that requires electric utilities to file a distribution rate case within four years of the last rate case.

As part of the settlement agreement, CL&P agreed to withdraw with prejudice its pending appeals of PURA’s April 28, 2021 and July 14, 2021 decisions related to Storm Isaias and agreed to waive its right to file an appeal and seek a judicial stay of the final decision in the interim rate reduction docket. The settlement agreement assures that CL&P will have the opportunity to petition for and demonstrate the prudence of the storm costs incurred to respond to customer outages associated with Storm Isaias in a future ratemaking proceeding.

The cumulative pre-tax impact of the settlement agreement and the Storm Isaias assessment imposed in PURA’s April 28, 2021 and July 14, 2021 decisions totaled $103.6 million, and the after-tax earnings impact was $85.8 million, or $0.25 per share, for the nine months ended September 30, 2021.

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FAIR VALUE OF FINANCIAL INSTRUMENTS

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

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 long-term debt and RRB debt securities 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.  The fair values provided in the table below are classified as Level 2 within the fair value hierarchy.  Carrying amounts and estimated fair values are as follows:

	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of September 30, 2021:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	165.5	$	116.2	$	121.4	$	43.0	$	44.1	$	—	$	—
Long-Term Debt	18,219.2		19,810.9		4,215.1		4,865.2		3,984.7		4,494.3		1,163.6		1,228.9
Rate Reduction Bonds	496.9		555.8		—		—		—		—		496.9		555.8
As of December 31, 2020:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	169.1	$	116.2	$	123.4	$	43.0	$	45.7	$	—	$	—
Long-Term Debt	16,179.1		18,420.1		3,914.8		4,800.9		3,643.2		4,294.0		1,099.1		1,207.0
Rate Reduction Bonds	540.1		603.4		—		—		—		—		540.1		603.4

Derivative Instruments and Marketable Securities: Derivative instruments and investments in marketable securities are carried at fair value.  For further information, see Note 4, "Derivative Instruments," and Note 5, "Marketable Securities," to the financial statements.  

See Note 1D, "Summary of Significant Accounting Policies – Fair Value Measurements," for the fair value measurement policy and the fair value hierarchy.

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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)

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

	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Marketable Securities		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Unrealized Gains on Marketable Securities		Defined Benefit Plans		Total
Balance as of Beginning of Period	$	(1.4)	$	1.1	$	(76.1)	$	(76.4)	$	(3.0)	$	0.7	$	(62.8)	$	(65.1)
OCI Before Reclassifications	—		(0.6)		(2.4)		(3.0)		—		0.3		(1.6)		(1.3)
Amounts Reclassified from AOCI	1.0		—		6.5		7.5		1.2		—		4.8		6.0
Net OCI	1.0		(0.6)		4.1		4.5		1.2		0.3		3.2		4.7
Balance as of End of Period	$	(0.4)	$	0.5	$	(72.0)	$	(71.9)	$	(1.8)	$	1.0	$	(59.6)	$	(60.4)

Defined benefit plan OCI amounts before reclassifications relate to actuarial gains and losses that arose during the year and were recognized in AOCI. The unamortized actuarial gains and losses and prior service costs on the defined benefit plans are amortized from AOCI into Other Income, Net over the average future employee service period, and are reflected in amounts reclassified from AOCI.

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COMMON SHARES

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

COMMON SHARES

COMMON SHARES

The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values:  

	Shares
			Authorized as of September 30, 2021 and December 31, 2020	Issued as of
	Par Value			September 30, 2021	December 31, 2020
Eversource	$	5	380,000,000	357,818,402	357,818,402
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

Treasury Shares: As of September 30, 2021 and December 31, 2020, there were 14,044,078 and 14,864,379 Eversource common shares held as treasury shares, respectively. As of September 30, 2021 and December 31, 2020, Eversource common shares outstanding were 343,774,324 and 342,954,023, respectively.

Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares.COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTSDividends on the preferred stock of CL&P and NSTAR Electric totaled $1.9 million for each of the three months ended September 30, 2021 and 2020 and $5.6 million for each of the nine months ended September 30, 2021 and 2020. These dividends were presented as Net Income Attributable to Noncontrolling Interests on the Eversource statements of income. Noncontrolling Interest – Preferred Stock of Subsidiaries on the Eversource balance sheets totaled $155.6 million as of September 30, 2021 and December 31, 2020. On the Eversource balance sheets, Common Shareholders' Equity was fully attributable to Eversource parent and Noncontrolling Interest – Preferred Stock of Subsidiaries was fully attributable to the noncontrolling interest.

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COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS

COMMON SHARES

The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values:  

	Shares
			Authorized as of September 30, 2021 and December 31, 2020	Issued as of
	Par Value			September 30, 2021	December 31, 2020
Eversource	$	5	380,000,000	357,818,402	357,818,402
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

Treasury Shares: As of September 30, 2021 and December 31, 2020, there were 14,044,078 and 14,864,379 Eversource common shares held as treasury shares, respectively. As of September 30, 2021 and December 31, 2020, Eversource common shares outstanding were 343,774,324 and 342,954,023, respectively.

Eversource issues treasury shares to satisfy awards under the Company's incentive plans, shares issued under the dividend reinvestment and share purchase plan, and matching contributions under the Eversource 401k Plan. The issuance of treasury shares represents a non-cash transaction, as the treasury shares were used to fulfill Eversource's obligations that require the issuance of common shares.COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTSDividends on the preferred stock of CL&P and NSTAR Electric totaled $1.9 million for each of the three months ended September 30, 2021 and 2020 and $5.6 million for each of the nine months ended September 30, 2021 and 2020. These dividends were presented as Net Income Attributable to Noncontrolling Interests on the Eversource statements of income. Noncontrolling Interest – Preferred Stock of Subsidiaries on the Eversource balance sheets totaled $155.6 million as of September 30, 2021 and December 31, 2020. On the Eversource balance sheets, Common Shareholders' Equity was fully attributable to Eversource parent and Noncontrolling Interest – Preferred Stock of Subsidiaries was fully attributable to the noncontrolling interest.

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHAREBasic 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 of certain share-based compensation awards as if they were converted into outstanding common shares.  The dilutive effect of unvested RSU and performance share awards is calculated using the treasury stock method.  RSU and performance share awards are included in basic weighted average common shares outstanding as of the date that all necessary vesting conditions have been satisfied. There were no antidilutive share awards excluded from the computation of diluted EPS for the three and nine months ended September 30, 2021 and the three months ended September 30, 2020. For the nine months ended September 30, 2020, there were 52,747 antidilutive share awards excluded from the EPS computation, as their impact would have been antidilutive. Antidilutive shares pertained to a purchase option extended to underwriters in connection with Eversource’s common share issuance on June 15, 2020.

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

Eversource (Millions of Dollars, except share information)	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Net Income Attributable to Common Shareholders	$	283.2	$	346.3	$	913.8	$	933.2
Weighted Average Common Shares Outstanding:
Basic	344,023,846		343,076,614		343,848,905		337,375,172
Dilutive Effect of:
Share-Based Compensation Awards and Other	645,936		696,988		631,151		686,403
Equity Forward Sale Agreement	—		—		—		362,525
Total Dilutive Effect	645,936		696,988		631,151		1,048,928
Diluted	344,669,782		343,773,602		344,480,056		338,424,100
Basic EPS	$	0.82	$	1.01	$	2.66	$	2.77
Diluted EPS	$	0.82	$	1.01	$	2.65	$	2.76

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REVENUES

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

REVENUES

REVENUESThe following tables present operating revenues disaggregated by revenue source:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,146.8	$	81.7	$	—	$	39.1	$	—	$	—	$	1,267.6
Commercial	748.8		59.0		—		17.2		—		(1.4)		823.6
Industrial	96.2		28.6		—		1.1		—		(4.8)		121.1
Total Retail Tariff Sales Revenues	1,991.8		169.3		—		57.4		—		(6.2)		2,212.3
Wholesale Transmission Revenues	—		—		527.2		—		23.0		(408.5)		141.7
Wholesale Market Sales Revenues	133.8		12.2		—		1.1		—		—		147.1
Other Revenues from Contracts with Customers	29.6		1.2		3.5		1.8		303.1		(301.4)		37.8
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(0.9)		—		—		(94.3)
Total Revenues from Contracts with Customers	2,061.8		182.7		530.7		59.4		326.1		(716.1)		2,444.6
Alternative Revenue Programs	(7.9)		2.7		(112.6)		2.3		—		102.0		(13.5)
Other Revenues (2)	1.3		0.1		0.2		0.1		—		—		1.7
Total Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,094.9	$	722.8	$	—	$	102.8	$	—	$	—	$	3,920.5
Commercial	1,902.9		356.4		—		47.0		—		(4.1)		2,302.2
Industrial	261.1		119.5		—		3.3		—		(12.8)		371.1
Total Retail Tariff Sales Revenues	5,258.9		1,198.7		—		153.1		—		(16.9)		6,593.8
Wholesale Transmission Revenues	—		—		1,338.4		—		62.5		(1,075.4)		325.5
Wholesale Market Sales Revenues	380.1		54.1		—		3.0		—		—		437.2
Other Revenues from Contracts with Customers	68.4		3.6		10.2		5.5		936.6		(929.6)		94.7
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(2.2)		—		—		(95.6)
Total Revenues from Contracts with Customers	5,614.0		1,256.4		1,348.6		159.4		999.1		(2,021.9)		7,355.6
Alternative Revenue Programs	14.9		21.3		(119.2)		1.3		—		103.0		21.3
Other Revenues (2)	3.2		0.1		0.7		0.3		—		—		4.3
Total Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2

	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,183.9	$	45.5	$	—	$	45.8	$	—	$	—	$	1,275.2
Commercial	682.7		41.1		—		17.1		—		(1.4)		739.5
Industrial	91.0		17.5		—		1.3		—		(3.6)		106.2
Total Retail Tariff Sales Revenues	1,957.6		104.1		—		64.2		—		(5.0)		2,120.9
Wholesale Transmission Revenues	—		—		458.2		—		19.0		(365.6)		111.6
Wholesale Market Sales Revenues	79.6		8.7		—		1.1		—		—		89.4
Other Revenues from Contracts with Customers	20.7		1.3		3.2		0.7		303.3		(299.0)		30.2
Total Revenues from Contracts with Customers	2,057.9		114.1		461.4		66.0		322.3		(669.6)		2,352.1
Alternative Revenue Programs	1.7		(4.0)		(72.3)		(2.0)		—		67.0		(9.6)
Other Revenues (2)	0.7		0.1		0.2		0.1		—		—		1.1
Total Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,063.7	$	399.6	$	—	$	113.2	$	—	$	—	$	3,576.5
Commercial	1,815.7		243.5		—		47.7		—		(3.7)		2,103.2
Industrial	248.4		67.0		—		3.6		—		(10.1)		308.9
Total Retail Tariff Sales Revenues	5,127.8		710.1		—		164.5		—		(13.8)		5,988.6
Wholesale Transmission Revenues	—		—		1,177.9		—		55.6		(981.4)		252.1
Wholesale Market Sales Revenues	231.1		31.9		—		2.9		—		—		265.9
Other Revenues from Contracts with Customers	63.3		4.1		9.9		2.8		845.1		(838.0)		87.2
Total Revenues from Contracts with Customers	5,422.2		746.1		1,187.8		170.2		900.7		(1,833.2)		6,593.8
Alternative Revenue Programs	54.8		22.9		(52.7)		(4.1)		—		48.9		69.8
Other Revenues (2)	4.9		1.0		0.5		0.5		—		—		6.9
Total Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5

	For the Three Months Ended September 30, 2021						For the Three Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	572.0	$	401.9	$	172.9	$	608.7	$	415.4	$	159.8
Commercial	249.4		411.3		88.5		244.7		358.3		80.1
Industrial	35.0		35.9		25.3		38.0		30.6		22.4
Total Retail Tariff Sales Revenues	856.4		849.1		286.7		891.4		804.3		262.3
Wholesale Transmission Revenues	268.2		171.0		88.0		233.3		153.1		71.8
Wholesale Market Sales Revenues	100.3		21.3		12.2		60.0		12.1		7.5
Other Revenues from Contracts with Customers	12.1		14.3		7.3		8.1		10.5		3.7
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		2.3
Total Revenues from Contracts with Customers	1,143.6		1,055.7		394.2		1,192.8		980.0		347.6
Alternative Revenue Programs	(82.0)		(14.4)		(24.1)		(65.0)		8.2		(13.8)
Other Revenues (2)	0.2		0.7		0.6		0.2		0.7		—
Eliminations	(142.2)		(123.3)		(55.8)		(133.7)		(113.5)		(50.1)
Total Operating Revenues	$	919.6	$	918.7	$	314.9	$	994.3	$	875.4	$	283.7

	For the Nine Months Ended September 30, 2021						For the Nine Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,558.6	$	1,069.0	$	467.3	$	1,567.9	$	1,057.9	$	437.9
Commercial	679.3		975.7		249.2		670.4		921.3		225.3
Industrial	100.2		89.5		71.4		105.3		82.1		61.0
Total Retail Tariff Sales Revenues	2,338.1		2,134.2		787.9		2,343.6		2,061.3		724.2
Wholesale Transmission Revenues	652.8		478.2		207.4		576.5		430.3		171.1
Wholesale Market Sales Revenues	278.1		64.7		37.3		163.9		39.8		27.4
Other Revenues from Contracts with Customers	28.8		36.8		14.9		25.1		32.4		10.9
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		6.9
Total Revenues from Contracts with Customers	3,204.4		2,713.9		1,047.5		3,109.1		2,563.8		940.5
Alternative Revenue Programs	(74.2)		(11.3)		(18.8)		(27.8)		31.1		(1.2)
Other Revenues (2)	0.3		2.5		1.1		2.0		2.8		0.6
Eliminations	(394.0)		(362.0)		(142.6)		(371.9)		(327.5)		(124.6)
Total Operating Revenues	$	2,736.5	$	2,343.1	$	887.2	$	2,711.4	$	2,270.2	$	815.3

(1)    The Electric Distribution segment 2021 revenue subject to refund amount relates to an October 1, 2021 CL&P settlement agreement with the DEEP, OCC, AG and the Connecticut Industrial Energy Consumers, which resolved certain issues that arose in pending regulatory proceedings initiated by the PURA. In the third quarter of 2021, CL&P recorded a reduction to Operating Revenues of $65 million on the income statement for a reserve for customer credits associated with the provisions of the settlement agreement. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards to be credited to customers. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. In total, the reserve for revenues subject to refund totaled $93.4 million and was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

(2)    Other Revenues include certain fees charged to customers that are not considered revenue from contracts with customers. Other Revenues also include lease revenues under lessor accounting guidance of $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) and $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) for the three months ended September 30, 2021 and 2020, respectively, and $3.8 million (including $0.6 million at CL&P and $2.5 million at NSTAR Electric) and $3.2 million (including $0.6 million at CL&P and $2.1 million at NSTAR Electric) for the nine months ended September 30, 2021 and 2020, respectively.

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SEGMENT INFORMATION

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

Eversource is organized into the Electric Distribution, Electric Transmission, Natural Gas Distribution and Water Distribution reportable segments and Other based on a combination of factors, including the characteristics of each segments' services, the sources of operating revenues and expenses and the regulatory environment in which each segment operates.  These reportable segments represent substantially all of Eversource's total consolidated revenues.  Revenues from the sale of electricity, natural gas and water primarily are derived from residential, commercial and industrial customers and are not dependent on any single customer.  The Electric Distribution reportable segment includes the results of NSTAR Electric's solar power facilities. Eversource's reportable segments are determined based upon the level at which Eversource's chief operating decision maker assesses performance and makes decisions about the allocation of company resources.

The remainder of Eversource's operations is presented as Other in the tables below and primarily consists of 1) the equity in earnings of Eversource parent from its subsidiaries and intercompany interest income, both of which are eliminated in consolidation, and interest expense related to the debt of Eversource parent, 2) the revenues and expenses of Eversource Service, most of which are eliminated in consolidation, 3) the operations of CYAPC and YAEC, 4) the results of other unregulated subsidiaries, which are not part of its core business, and 5) Eversource parent's equity ownership interests that are not consolidated, which primarily include the offshore wind business, a natural gas pipeline owned by Enbridge, Inc., and a renewable energy investment fund.

In the ordinary course of business, Yankee Gas, NSTAR Gas and EGMA purchase natural gas transmission services from the Enbridge, Inc. natural gas pipeline project described above. These affiliate transaction costs total $77.7 million annually and are classified as Purchased Power, Fuel and Transmission on the Eversource statements of income.

Each of Eversource's subsidiaries, including CL&P, NSTAR Electric and PSNH, has one reportable segment.

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.   

Eversource's segment information is as follows:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
Depreciation and Amortization	(179.8)		(28.5)		(75.4)		(11.5)		(28.0)		1.1		(322.1)
Other Operating Expenses	(1,640.5)		(176.9)		(122.4)		(26.1)		(275.2)		613.7		(1,627.4)
Operating Income/(Loss)	$	234.9	$	(19.9)	$	220.5	$	24.2	$	22.9	$	0.7	$	483.3
Interest Expense	$	(61.0)	$	(15.7)	$	(33.5)	$	(8.0)	$	(42.5)	$	12.7	$	(148.0)
Other Income, Net	25.4		6.7		5.0		1.2		325.9		(320.4)		43.8
Net Income/(Loss) Attributable to Common    Shareholders	150.4		(22.0)		139.4		17.5		304.9		(307.0)		283.2
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2
Depreciation and Amortization	(534.1)		(108.7)		(223.4)		(34.3)		(83.7)		3.1		(981.1)
Other Operating Expenses	(4,531.3)		(970.6)		(359.6)		(76.7)		(860.3)		1,918.9		(4,879.6)
Operating Income	$	566.7	$	198.5	$	647.1	$	50.0	$	55.1	$	3.1	$	1,520.5
Interest Expense	$	(175.4)	$	(44.2)	$	(98.7)	$	(24.0)	$	(125.9)	$	37.0	$	(431.2)
Other Income, Net	76.0		15.2		17.3		3.1		1,059.2		(1,046.2)		124.6
Net Income Attributable to Common Shareholders	365.4		129.6		412.4		30.0		982.5		(1,006.1)		913.8
Cash Flows Used for Investments in Plant	764.9		506.4		691.0		91.2		157.6		—		2,211.1

	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
Depreciation and Amortization	(182.0)		(14.8)		(70.6)		(10.8)		(24.1)		0.3		(302.0)
Other Operating Expenses	(1,577.0)		(104.2)		(120.6)		(10.2)		(271.5)		603.1		(1,480.4)
Operating Income/(Loss)	$	301.3	$	(8.8)	$	198.1	$	43.1	$	26.7	$	0.8	$	561.2
Interest Expense	$	(53.3)	$	(10.1)	$	(31.1)	$	(8.0)	$	(38.7)	$	7.1	$	(134.1)
Other Income, Net	16.0		0.7		6.9		1.6		401.0		(397.0)		29.2
Net Income/(Loss) Attributable to Common    Shareholders	205.5		(15.4)		125.6		23.1		396.6		(389.1)		346.3
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5
Depreciation and Amortization	(490.0)		(55.1)		(206.8)		(33.1)		(68.1)		1.2		(851.9)
Other Operating Expenses	(4,309.9)		(592.0)		(338.5)		(60.7)		(771.4)		1,787.9		(4,284.6)
Operating Income	$	682.0	$	122.9	$	590.3	$	72.8	$	61.2	$	4.8	$	1,534.0
Interest Expense	$	(160.7)	$	(32.1)	$	(93.8)	$	(25.1)	$	(119.0)	$	27.6	$	(403.1)
Other Income, Net	44.9		2.5		22.7		1.7		1,087.9		(1,076.1)		83.6
Net Income Attributable to Common Shareholders	450.6		73.3		381.8		35.6		1,035.6		(1,043.7)		933.2
Cash Flows Used for Investments in Plant	781.2		322.8		732.4		84.0		181.2		—		2,101.6

(1)    On October 9, 2020, Eversource completed the CMA asset acquisition, with Yankee Energy System, Inc. (Yankee parent) as the acquiring entity. Yankee parent is the parent company of Yankee Gas, NSTAR Gas, EGMA and Hopkinton LNG Corp. As a result of the acquisition, in the fourth quarter of 2020, our chief operating decision maker assessed the performance of the Natural Gas Distribution segment including Yankee parent. Previously, Yankee parent was presented within Other and its equity in earnings were eliminated in consolidation. Prior comparative periods were revised to conform to the current period segment presentation.

The following table summarizes Eversource's segmented total assets:

Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
As of September 30, 2021	$	25,604.2	$	6,865.6	$	12,123.5	$	2,444.9	$	21,624.5	$	(20,648.6)	$	48,014.1
As of December 31, 2020	24,981.9		6,450.5		11,695.0		2,375.2		22,089.4		(21,492.4)		46,099.6

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ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS

ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS

On October 9, 2020, Eversource acquired certain assets and liabilities that comprised the NiSource Inc. (NiSource) natural gas distribution business in Massachusetts, which was previously doing business as CMA, pursuant to an asset purchase agreement (the Agreement) entered into on February 26, 2020 between Eversource and NiSource. The cash purchase price was $1.1 billion, plus a working capital amount of $68.6 million, as finalized in the first quarter of 2021. The natural gas distribution assets acquired from CMA were assigned to EGMA, an indirect wholly-owned subsidiary of Eversource formed in 2020. The LNG assets acquired from CMA were assigned to Hopkinton LNG Corp.

Preliminary Purchase Price Allocation: The purchase price allocation reflects measurement period adjustments recorded in 2021 to reduce the fair values of certain regulatory and plant assets and certain liabilities acquired, resulting in a corresponding increase to Goodwill, based on new information received during the measurement period.

The preliminary allocation of the cash purchase price is as follows:

(Millions of Dollars)
Current Assets	$	138
Restricted Cash	57
PP&E	1,184
Goodwill	50
Other Noncurrent Assets, excluding Goodwill	131
Other Current Liabilities	(81)
Other Noncurrent Liabilities	(310)
Cash Purchase Price	$	1,169

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

Eversource Energy is a public utility holding company primarily engaged, through its wholly-owned regulated utility subsidiaries, in the energy delivery business.  Eversource Energy's wholly-owned regulated utility subsidiaries consist of CL&P, NSTAR Electric and PSNH (electric utilities), Yankee Gas, NSTAR Gas and Eversource Gas Company of Massachusetts (EGMA) (natural gas utilities) and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.3 million electric, natural gas and water customers through nine regulated utilities in Connecticut, Massachusetts and New Hampshire.

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

The combined notes to the financial statements have been prepared pursuant to the rules and regulations of the SEC.  Certain information and footnote disclosures included in annual financial statements prepared in accordance with GAAP have been omitted pursuant to such rules and regulations.  The accompanying financial statements should be read in conjunction with the Combined Notes to Financial Statements included in Item 8, "Financial Statements and Supplementary Data," of the Eversource 2020 Form 10-K, which was filed with the SEC on February 17, 2021. The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.

The financial statements contain, in the opinion of management, all adjustments (including normal, recurring adjustments) necessary to present fairly Eversource's, CL&P's, NSTAR Electric's and PSNH's financial position as of September 30, 2021 and December 31, 2020, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020. The results of operations and comprehensive income for the three and nine months ended September 30, 2021 and 2020 and the cash flows for the nine months ended September 30, 2021 and 2020 are not necessarily indicative of the results expected for a full year.  

Eversource's consolidated financial information includes the results of the acquisition of the assets of Columbia Gas of Massachusetts (CMA) on October 9, 2020. The natural gas distribution assets acquired from CMA on October 9, 2020 were assigned to EGMA.

Eversource consolidates the operations of CYAPC and YAEC, both of which are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates CYAPC and YAEC because CL&P's, NSTAR Electric's and PSNH's combined ownership and voting interests in each of these entities is greater than 50 percent.  Intercompany transactions between CL&P, NSTAR Electric, PSNH and the CYAPC and YAEC companies have been eliminated in consolidation of the Eversource financial statements.

Eversource holds several equity ownership interests that are not consolidated and are accounted for under the equity method.

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

COVID-19 has adversely affected customers, workers and the U.S. economy. We provide a critical service to our customers and have taken extensive measures to maintain its safety and reliability. We continue to address the impacts of the COVID-19 pandemic and how the related developments affect Eversource. We are in the re-entry phase of our pandemic response plan, in which the majority of our employees under remote work arrangements have transitioned back to the workplace. We have not experienced significant impacts directly related to the pandemic that have materially affected our current operations, our workforce, or results of operations. The extent of the impact to us in the future will vary, and depend on the duration, scope and severity of the pandemic and the resulting impact on economic, health care and capital market conditions. The future impact will also depend on the outcome of future proceedings before our state regulatory commissions to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses.

Based on the status of our COVID-19 regulatory dockets, communications with our state regulatory commissions, and policies and practices in the jurisdictions in which we operate, we believe our state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental costs associated with COVID-19, which include uncollectible customer receivable expenses, while balancing the impact on our customers’ bills and our operating cash flows. See Note 1C, "Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts," for discussion of our evaluation of the allowance for doubtful accounts as of September 30, 2021 in light of the COVID-19 pandemic and Note 2, "Regulatory Accounting," for the amount of net incremental COVID-19 costs deferred on our balance sheets.

Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.

Accounting Standards

Accounting StandardsAccounting Standards Recently Adopted: On January 1, 2021, the Company adopted Accounting Standards Update (ASU) 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes, which eliminates certain exceptions to the general principles of current income tax guidance in ASC 740 and simplifies and improves consistency in application of that income tax guidance through clarifications of and amendments to ASC 740. The ASU did not have a material impact on the financial statements of Eversource, CL&P, NSTAR Electric and PSNH.

Allowance for Uncollectible Accounts

Allowance for Uncollectible Accounts

Receivables, Net on the balance sheets primarily includes trade receivables from retail customers and customers related to wholesale transmission contracts, wholesale market sales, sales of RECs and property rentals. Receivables, Net also includes customer receivables for the purchase of electricity from a competitive third party supplier, the current portion of customer energy efficiency loans, property damage receivables and other miscellaneous receivables. There is no material concentration of receivables. Receivables are recorded at amortized cost, net of a credit loss provision (or allowance for uncollectible accounts).

Receivables are presented net of expected credit losses at estimated net realizable value by maintaining an allowance for uncollectible accounts. The current expected credit loss (CECL) model is applied to receivables for purposes of calculating the allowance for uncollectible accounts. This model is based on expected losses and results in the recognition of estimated expected credit losses, including uncollectible amounts for both billed and unbilled revenues, over the life of the receivable at the time a receivable is recorded.

The allowance for uncollectible accounts is determined based upon a variety of judgments and factors, including the application of an estimated uncollectible percentage to each receivable aging category.  Factors in determining credit loss include historical collection, write-off experience, and management's assessment of collectability from customers, including current conditions, reasonable forecasts, and expectations of future collectability and collection efforts. Management continuously assesses the collectability of receivables and adjusts estimates based on actual experience and future expectations based on economic indicators, collection efforts and other factors.  Management also monitors the aging analysis of receivables to determine if there are changes in the collections of accounts receivable. Receivable balances are written off against the allowance for uncollectible accounts when the customer accounts are no longer in service and these balances are deemed to be uncollectible.

As of September 30, 2021, management evaluated the adequacy of the allowance for uncollectible accounts in light of the COVID-19 pandemic and the related economic downturn. This evaluation included an analysis of collection and customer payment trends, economic conditions, delinquency statistics, aging-based quantitative assessments, the impact on residential customer bills because of energy usage and change in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, and COVID-19 developments, including any potential federal governmental pandemic relief programs and the expansion of unemployment benefit initiatives, which help to mitigate the potential for increasing customer account delinquencies. Additionally, management considered past economic declines and corresponding uncollectible reserves as part of the current assessment.

This evaluation has shown that our operating companies have experienced an increase in aged receivables and lower cash collections from customers because of the length of the moratorium on disconnections in Connecticut and Massachusetts, and the economic slowdown resulting from the COVID-19 pandemic. In Connecticut, the moratorium on disconnections of commercial and non-hardship residential customers ended in June 2021 and September 2021, respectively, but is still in place for hardship residential customers. In Massachusetts, the moratorium on disconnections of commercial customers and residential customers ended in September 2020 and July 2021, respectively. Disconnection activities have resumed after these moratoria have expired, which has resulted in recent improved collection experience and more customers applying for, and receiving, hardship status. On July 7, 2021, the NHPUC issued an order to New Hampshire utilities that concluded that recovery of incremental bad debt or waived late fees related to the COVID-19 pandemic would be addressed in a future rate case to the extent those costs are relevant at that time. As a result of the order, in the first nine months of 2021, PSNH removed its $0.6 million deferral of net incremental COVID-19 costs. In New Hampshire, the moratorium on disconnections of non-hardship residential and commercial customers ended in late 2020 and for hardship residential customers ended in May 2021 and PSNH has resumed disconnection activities, which has resulted in improved collection of outstanding customer receivable balances.

Based upon the evaluation performed, in the first nine months of 2021, management increased the allowance for uncollectible accounts for amounts incurred as a result of COVID-19 by $25.8 million for Eversource (increase of $16.3 million for CL&P and $12.5 million at our natural gas businesses, and decrease of $1.8 million at NSTAR Electric). In the third quarter of 2021, the COVID-19 related allowance for uncollectible accounts decreased by $6.5 million at Eversource (increased $4.0 million at CL&P, and decreased $8.3 million at NSTAR Electric and $2.2 million at our natural gas businesses). The COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs at our Connecticut and Massachusetts utilities or deferred through existing regulatory tracking mechanisms that recover uncollectible energy supply costs, as management believes it is probable that these costs will ultimately be recovered from customers in future rates. As of September 30, 2021, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $57.0 million at Eversource ($20.1 million at CL&P, $8.5 million at NSTAR Electric, and $27.4 million at our natural gas businesses).

Management concluded that the reserve balance as of September 30, 2021 adequately reflected the collection risk and net realizable value for Eversource’s receivables. Management will continue to evaluate the adequacy of the uncollectible allowance in future reporting periods based on an ongoing assessment of accounts receivable collections, delinquency statistics, and analysis of aging-based quantitative assessments.

The PURA allows CL&P and Yankee Gas to accelerate the recovery of accounts receivable balances attributable to qualified customers under financial or medical duress (uncollectible hardship accounts receivable) outstanding for greater than 180 days and 90 days, respectively.  The DPU allows NSTAR Electric, NSTAR Gas and EGMA to recover in rates amounts associated with certain uncollectible hardship accounts receivable. These uncollectible hardship customer account balances are included in Regulatory Assets or Other Long-Term Assets on the balance sheets. Hardship customers are protected from shut-off in certain circumstances, and historical collection experience has reflected a higher default risk as compared to the rest of the receivable population. Management uses a higher credit risk profile for this pool of trade receivables as compared to non-hardship receivables. The allowance for uncollectible hardship accounts is included in the total uncollectible allowance balance.

The total allowance for uncollectible accounts is included in Receivables, Net on the balance sheets.

Fair Value Measurements

Fair Value Measurements

Fair value measurement guidance is applied to derivative contracts that are not elected or designated as "normal purchases" or "normal sales" (normal) and to the marketable securities held in trusts.  Fair value measurement guidance is also applied to valuations of the investments used to calculate the funded status of pension and PBOP plans, the nonrecurring fair value measurements of nonfinancial assets such as goodwill, long-lived assets, equity method investments, and AROs, and in the valuation of the acquisition of CMA's assets in 2020. The fair value measurement guidance was also applied in estimating the fair value of preferred stock, long-term debt and RRBs.

Fair Value Hierarchy:  In measuring fair value, Eversource uses observable market data when available in order to minimize 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.  Eversource evaluates the classification of assets and liabilities measured at fair value on a quarterly basis. The 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.  

Uncategorized - Investments that are measured at net asset value are not categorized within the fair value hierarchy.

Other Taxes

Other TaxesEversource's companies that serve customers in Connecticut collect gross receipts taxes levied by the state of Connecticut from their customers. These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of incomeAs agents for state and local governments, Eversource's companies that serve customers in Connecticut and Massachusetts collect certain sales taxes that are recorded on a net basis with no impact on the statements of income.

Restricted Cash

Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, and CYAPC and YAEC cash balances. Special Deposits are included in Current Assets on the balance sheets. Restricted cash included in Marketable Securities represents money market funds held in trusts to fund certain non-qualified executive benefits and restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations. Restricted cash included in Other Long-Term Assets includes $41.5 million related to an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley, and an additional energy efficiency program established under the terms of the EGMA settlement agreement.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Allowance for Uncollectible Accounts

The activity in the allowance for uncollectible accounts by portfolio segment as of September 30th is as follows:

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2021
Beginning Balance	$	210.7	$	215.1	$	425.8	$	145.6	$	43.2	$	188.8	$	35.9	$	62.1	$	98.0	$	17.2
Uncollectible Expense	—		12.0		12.0		—		3.6		3.6		—		5.1		5.1		1.2
Uncollectible Costs Deferred (1)	22.8		1.7		24.5		4.5		5.7		10.2		11.8		(3.5)		8.3		1.2
Write-Offs	(3.9)		(20.5)		(24.4)		(3.5)		(5.4)		(8.9)		(0.1)		(7.4)		(7.5)		(2.8)
Recoveries Collected	0.3		3.5		3.8		0.2		1.6		1.8		—		1.1		1.1		0.2
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0
Nine Months Ended 2021
Beginning Balance	$	194.8	$	164.1	$	358.9	$	129.1	$	28.3	$	157.4	$	39.7	$	51.9	$	91.6	$	17.2
Uncollectible Expense	—		39.7		39.7		—		10.2		10.2		—		12.5		12.5		4.4
Uncollectible Costs Deferred (1)	44.8		53.3		98.1		25.7		21.4		47.1		8.3		11.8		20.1		2.0
Write-Offs	(10.6)		(55.2)		(65.8)		(8.7)		(14.8)		(23.5)		(0.4)		(22.6)		(23.0)		(7.3)
Recoveries Collected	0.9		9.9		10.8		0.7		3.6		4.3		—		3.8		3.8		0.7
Ending Balance	$	229.9	$	211.8	$	441.7	$	146.8	$	48.7	$	195.5	$	47.6	$	57.4	$	105.0	$	17.0

	Eversource						CL&P						NSTAR Electric						PSNH
(Millions of Dollars)	Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale and Other Receivables		Total Allowance		Hardship Accounts		Retail (Non-Hardship), Wholesale, and Other Receivables		Total Allowance		Total Allowance
Three Months Ended 2020
Beginning Balance	$	175.5	$	94.5	$	270.0	$	116.3	$	20.4	$	136.7	$	34.6	$	34.1	$	68.7	$	11.8
Uncollectible Expense	—		10.5		10.5		—		3.8		3.8		—		4.5		4.5		0.8
Uncollectible Costs Deferred (1)	10.1		20.4		30.5		11.2		4.9		16.1		(1.3)		10.4		9.1		3.2
Write-Offs	(7.3)		(11.8)		(19.1)		(2.6)		(4.6)		(7.2)		(0.2)		(6.3)		(6.5)		(2.0)
Recoveries Collected	0.4		2.7		3.1		0.3		1.1		1.4		—		1.0		1.0		0.2
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0
Nine Months Ended 2020
Beginning Balance	$	143.3	$	81.5	$	224.8	$	80.1	$	17.2	$	97.3	$	43.9	$	31.5	$	75.4	$	10.5
ASU 2016-13 Implementation   Impact on January 1, 2020	21.6		2.2		23.8		21.3		0.9		22.2		(1.6)		0.3		(1.3)		0.3
Uncollectible Expense	—		31.1		31.1		—		10.0		10.0		—		11.3		11.3		2.1
Uncollectible Costs Deferred (1)	24.9		41.5		66.4		32.7		8.3		41.0		(8.4)		17.3		8.9		5.6
Write-Offs	(12.3)		(49.3)		(61.6)		(10.0)		(14.0)		(24.0)		(0.8)		(20.5)		(21.3)		(5.0)
Recoveries Collected	1.2		9.3		10.5		1.1		3.2		4.3		—		3.8		3.8		0.5
Ending Balance	$	178.7	$	116.3	$	295.0	$	125.2	$	25.6	$	150.8	$	33.1	$	43.7	$	76.8	$	14.0

(1) These expected credit losses are deferred as regulatory costs on the balance sheets, as these amounts are ultimately recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible amounts related to COVID-19 and uncollectible energy supply costs.

Components of Other Income, Net

The components of Other Income, Net on the statements of income were as follows:

	For the Three Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	21.7	$	4.2	$	10.1	$	2.5	$	11.0	$	0.9	$	7.2	$	1.8
AFUDC Equity	10.3		1.7		6.2		0.3		10.3		3.5		5.5		0.9
Equity in Earnings of Unconsolidated Affiliates (1)	4.9		—		0.1		—		3.9		—		0.1		—
Investment (Loss)/Income	(0.6)		(0.3)		(0.2)		(0.1)		1.0		1.3		(0.2)		0.2
Interest Income	7.3		1.3		3.9		0.4		1.5		0.2		0.1		1.2
Gain on Sale of Property	—		—		—		—		1.5		—		—		—
Other	0.2		—		0.1		0.1		—		—		0.1		—
Total Other Income, Net	$	43.8	$	6.9	$	20.2	$	3.2	$	29.2	$	5.9	$	12.8	$	4.1
	For the Nine Months Ended
	September 30, 2021								September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Pension, SERP and PBOP Non-Service    Income Components	$	63.9	$	11.2	$	30.3	$	7.9	$	34.3	$	3.0	$	22.2	$	5.2
AFUDC Equity	28.7		5.1		18.6		1.2		31.8		11.4		15.8		3.5
Equity in Earnings of Unconsolidated Affiliates (1)	13.3		—		0.3		—		13.8		—		0.4		—
Investment Income/(Loss)	0.7		1.2		0.6		0.3		(1.5)		—		(1.5)		0.1
Interest Income	17.2		4.1		8.8		2.0		3.3		1.8		0.7		2.0
Gain on Sale of Property	0.1		—		—		0.1		1.8		—		0.3		—
Other	0.7		0.1		0.3		0.1		0.1		0.1		0.3		0.1
Total Other Income, Net	$	124.6	$	21.7	$	58.9	$	11.6	$	83.6	$	16.3	$	38.2	$	10.9

(1)    Equity in earnings of unconsolidated affiliates includes $2.1 million of pre-tax unrealized gains associated with an investment in a renewable energy fund for the nine months ended September 30, 2021. For the nine months ended September 30, 2020, equity in earnings of unconsolidated affiliates included $2.4 million of primarily realized gains associated with this investment.

Other Taxes

These gross receipts taxes are recorded separately with collections in Operating Revenues and with payments in Taxes Other Than Income Taxes on the statements of income as follows:

	For the Three Months Ended				For the Nine Months Ended
(Millions of Dollars)	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Eversource	$	49.4	$	48.4	$	137.9	$	129.1
CL&P	46.1		45.6		120.7		114.2

Non-cash Investing Activities

Non-cash investing activities include plant additions included in Accounts Payable as follows:

(Millions of Dollars)	As of September 30, 2021		As of September 30, 2020
Eversource	$	359.6	$	357.4
CL&P	75.3		97.8
NSTAR Electric	94.2		92.6
PSNH	32.8		50.0

Reconciliation of Cash Balances to Cash and Restricted Cash

The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Cash as reported on the Balance Sheets	$	88.2	$	62.8	$	3.5	$	3.9	$	106.6	$	90.8	$	0.1	$	0.1
Restricted cash included in:
Special Deposits	55.5		8.7		17.2		18.6		73.6		8.7		17.2		36.8
Marketable Securities	29.7		0.3		0.1		0.5		41.2		0.3		0.1		0.6
Other Long-Term Assets	44.7		—		—		3.2		43.6		—		—		2.1
Cash and Restricted Cash as reported on the     Statements of Cash Flows	$	218.1	$	71.8	$	20.8	$	26.2	$	265.0	$	99.8	$	17.4	$	39.6

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REGULATORY ACCOUNTING (Tables)

9 Months Ended

Sep. 30, 2021

Regulated Operations [Abstract]

Components of Regulatory Assets

The components of regulatory assets were as follows:

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Benefit Costs	$	2,566.1	$	540.2	$	638.4	$	249.7	$	2,794.2	$	632.3	$	690.0	$	267.6
Income Taxes, Net	756.4		458.1		113.8		18.7		747.1		458.9		110.4		15.2
Securitized Stranded Costs	489.7		—		—		489.7		522.1		—		—		522.1
Storm Restoration Costs, Net	944.2		674.2		198.1		71.9		765.6		515.1		186.4		64.1
Regulatory Tracker Mechanisms	883.0		304.6		320.0		76.8		850.5		246.6		332.2		95.3
Derivative Liabilities	265.3		265.3		—		—		296.3		293.1		—		—
Goodwill-related	302.0		—		259.3		—		314.7		—		270.2		—
Asset Retirement Obligations	121.6		33.7		57.8		4.0		118.4		32.1		58.6		3.9
Other Regulatory Assets	146.9		31.0		48.7		16.9		161.0		33.7		56.1		20.9
Total Regulatory Assets	6,475.2		2,307.1		1,636.1		927.7		6,569.9		2,211.8		1,703.9		989.1
Less:  Current Portion	1,016.3		325.3		388.4		97.9		1,076.6		345.6		399.9		115.9
Total Long-Term Regulatory Assets	$	5,458.9	$	1,981.8	$	1,247.7	$	829.8	$	5,493.3	$	1,866.2	$	1,304.0	$	873.2

Components of Regulatory Liabilities

The components of regulatory liabilities were as follows:

	As of September 30, 2021								As of December 31, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
EDIT due to Tax Cuts and Jobs Act of 2017	$	2,737.1	$	1,001.5	$	1,025.6	$	363.9	$	2,778.6	$	1,010.7	$	1,044.0	$	371.5
Cost of Removal	676.7		117.0		384.1		19.0		624.8		98.4		363.6		12.9
Benefit Costs	65.9		—		56.5		—		83.6		—		72.5		—
Regulatory Tracker Mechanisms	484.5		208.9		180.6		87.5		366.5		148.9		139.7		47.8
AFUDC - Transmission	79.6		43.6		36.0		—		76.8		44.6		32.2		—
CL&P Settlement Agreement and Storm   Performance Penalty	103.4		103.4		—		—		—		—		—		—
Other Regulatory Liabilities	373.3		50.4		84.6		15.8		309.9		39.5		63.2		9.8
Total Regulatory Liabilities	4,520.5		1,524.8		1,767.4		486.2		4,240.2		1,342.1		1,715.2		442.0
Less:  Current Portion	612.9		311.3		205.8		96.8		389.4		137.2		164.8		58.8
Total Long-Term Regulatory Liabilities	$	3,907.6	$	1,213.5	$	1,561.6	$	389.4	$	3,850.8	$	1,204.9	$	1,550.4	$	383.2

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PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Summary of Property, Plant, and Equipment

The following tables summarize property, plant and equipment by asset category:

Eversource	As of September 30, 2021		As of December 31, 2020
(Millions of Dollars)
Distribution - Electric	$	17,257.3	$	16,703.2
Distribution - Natural Gas	6,334.9		6,111.2
Transmission - Electric	12,396.2		11,954.0
Distribution - Water	1,771.1		1,743.1
Solar	200.4		201.5
Utility	37,959.9		36,713.0
Other (1)	1,430.5		1,269.0
Property, Plant and Equipment, Gross	39,390.4		37,982.0
Less:  Accumulated Depreciation
Utility	(8,830.2)		(8,476.3)
Other	(550.0)		(477.6)
Total Accumulated Depreciation	(9,380.2)		(8,953.9)
Property, Plant and Equipment, Net	30,010.2		29,028.1
Construction Work in Progress	2,456.9		1,854.4
Total Property, Plant and Equipment, Net	$	32,467.1	$	30,882.5

	As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Distribution - Electric	$	7,028.9	$	7,798.8	$	2,469.9	$	6,820.7	$	7,544.4	$	2,378.4
Transmission - Electric	5,707.9		4,884.0		1,805.9		5,512.0		4,701.3		1,742.4
Solar	—		200.4		—		—		201.5		—
Property, Plant and Equipment, Gross	12,736.8		12,883.2		4,275.8		12,332.7		12,447.2		4,120.8
Less:  Accumulated Depreciation	(2,574.6)		(3,220.7)		(895.4)		(2,475.4)		(3,074.1)		(848.9)
Property, Plant and Equipment, Net	10,162.2		9,662.5		3,380.4		9,857.3		9,373.1		3,271.9
Construction Work in Progress	436.6		949.2		148.7		377.3		750.0		102.4
Total Property, Plant and Equipment, Net	$	10,598.8	$	10,611.7	$	3,529.1	$	10,234.6	$	10,123.1	$	3,374.3

(1)    These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

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DERIVATIVE INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Gross Fair Values and Net Amounts of Contracts

The following table presents the gross fair values of contracts, categorized by risk type, and the net amounts recorded as current or long-term derivative assets or liabilities:

		As of September 30, 2021						As of December 31, 2020
(Millions of Dollars)	Fair Value Hierarchy	Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative		Commodity Supply and Price Risk Management		Netting (1)		Net Amount Recorded as a Derivative
Current Derivative Assets:
CL&P	Level 3	$	14.4	$	(0.4)	$	14.0	$	13.7	$	(0.4)	$	13.3
Long-Term Derivative Assets:
CL&P	Level 3	51.1		(1.6)		49.5		58.7		(1.8)		56.9
Current Derivative Liabilities:
CL&P	Level 3	(72.2)		—		(72.2)		(68.8)		—		(68.8)
Other	Level 2	—		—		—		(3.3)		0.1		(3.2)
Long-Term Derivative Liabilities:
CL&P	Level 3	(256.6)		—		(256.6)		(294.5)		—		(294.5)

    

(1)    Amounts represent derivative assets and liabilities that Eversource elected to record net on the balance sheets.  These amounts are subject to master netting agreements or similar agreements for which the right of offset exists.

Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used

The following is a summary of Level 3 derivative contracts and the range of the significant unobservable inputs utilized in the valuations over the duration of the contracts:

	As of September 30, 2021								As of December 31, 2020
CL&P	Range				Weighted Average (1)			Period Covered	Range				Weighted Average (1)			Period Covered
Capacity Prices	$2.61				$	2.61	per kW-Month	2025 - 2026	$	4.30	—	$5.30	$	4.63	per kW-Month	2024 - 2026
Forward Reserve Prices	$	0.50	—	$1.15	$	0.82	per kW-Month	2022 - 2024	$	0.54	—	$0.90	$	0.72	per kW-Month	2021 - 2024

(1)    Unobservable inputs were weighted by the relative future capacity and forward reserve prices and contractual MWs over the periods covered.

Changes in the Level 3 Category of Derivative Assets Measured at Fair Value on a Recurring Basis

The following table presents changes 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.

CL&P	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
(Millions of Dollars)	2021		2020		2021		2020
Derivatives, Net:
Fair Value as of Beginning of Period	$	(279.7)	$	(322.0)	$	(293.1)	$	(329.2)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets	0.7		(4.7)		(10.9)		(22.3)
Settlements	13.7		14.9		38.7		39.7
Fair Value as of End of Period	$	(265.3)	$	(311.8)	$	(265.3)	$	(311.8)

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MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Debt Securities

The following is a summary of the available-for-sale debt securities, which are recorded at fair value and are included in current and long-term Marketable Securities on the balance sheets.

	As of September 30, 2021								As of December 31, 2020
Eversource (Millions of Dollars)	Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value		Amortized Cost		Pre-Tax Unrealized Gains		Pre-Tax Unrealized Losses		Fair Value
Debt Securities	$	217.5	$	8.0	$	(0.2)	$	225.3	$	213.1	$	11.2	$	(0.1)	$	224.2

Contractual Maturities of Available-for-Sale Debt Securities

As of September 30, 2021, the contractual maturities of available-for-sale debt securities were as follows:

 

Eversource (Millions of Dollars)	Amortized Cost		Fair Value
Less than one year (1)	$	30.9	$	30.9
One to five years	65.5		67.1
Six to ten years	41.8		43.9
Greater than ten years	79.3		83.4
Total Debt Securities	$	217.5	$	225.3

(1)    Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.

Marketable Securities Recorded at Fair Value on a Recurring Basis by Level

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:

Eversource (Millions of Dollars)	As of September 30, 2021		As of December 31, 2020
Level 1:
Mutual Funds and Equities	$	254.1	$	246.0
Money Market Funds	29.7		41.2
Total Level 1	$	283.8	$	287.2
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	98.9	$	72.9
Corporate Debt Securities	63.4		63.8
Asset-Backed Debt Securities	13.4		11.9
Municipal Bonds	6.1		24.0
Other Fixed Income Securities	13.8		10.4
Total Level 2	$	195.6	$	183.0
Total Marketable Securities	$	479.4	$	470.2

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SHORT-TERM AND LONG-TERM DEBT (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Borrowings Outstanding and Available under the Commercial Paper Programs

The amount of borrowings outstanding and available under the commercial paper programs were as follows:

	Borrowings Outstanding as of				Available Borrowing Capacity as of				Weighted-Average Interest Rate as of
	September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020		September 30, 2021		December 31, 2020
(Millions of Dollars)
Eversource Parent Commercial Paper Program	$	653.0	$	1,054.3	$	1,347.0	$	945.7	0.18	%	0.25	%
NSTAR Electric Commercial Paper Program	138.0		195.0		512.0		455.0		0.10	%	0.16	%

Summary of Long-Term Debt Issuance and Repayments

The following table summarizes long-term debt issuances and repayments:

(Millions of Dollars)	Issuance/(Repayment)		Issue Date or Repayment Date	Maturity Date	Use of Proceeds for Issuance/ Repayment Information
CL&P:
2.05% Series A First Mortgage Bonds	$	425.0	June 2021	July 2031	Repaid short-term debt, paid capital expenditures and working capital
4.38% Series A PCRB	(120.5)		September 2021	September 2028	Paid on par call date in advance of maturity
NSTAR Electric:
3.10% 2021 Debentures	300.0		May 2021	June 2051	Refinanced investments in eligible green expenditures, which were previously financed in 2019 and 2020
3.50% Series F Senior Notes	(250.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
1.95% 2021 Debentures	300.0		August 2021	August 2031	Repaid short-term debt, paid capital expenditures and working capital
PSNH:
4.05% Series Q First Mortgage Bonds	(122.0)		March 2021	June 2021	Paid on par call date in advance of maturity date
3.20% Series R First Mortgage Bonds	(160.0)		June 2021	September 2021	Paid on par call date in advance of maturity date
2.20% Series V First Mortgage Bonds	350.0		June 2021	June 2031	Repaid short-term debt, including short-term debt used to redeem Series R First Mortgage Bonds, paid capital expenditures and working capital
Other:
Eversource Parent 2.50% Series I Senior Notes	(450.0)		February 2021	March 2021	Paid on par call date in advance of maturity date
Eversource Parent 2.55% Series S Senior Notes	350.0		March 2021	March 2031	Repaid short-term debt, including short-term debt used to redeem Series I Senior Notes
Eversource Parent 1.40% Series U Senior Notes	300.0		August 2021	August 2026	Repaid short-term debt
Eversource Parent Variable Rate Series T Senior Notes (1)	350.0		August 2021	August 2023	Repaid short-term debt
Aquarion Water Company of Connecticut 3.31%    Senior Notes	100.0		April 2021	April 2051	Repaid 5.50% Notes, repaid short-term debt, paid capital expenditures and working capital
Aquarion Water Company of Connecticut 5.50% Notes	(40.0)		April 2021	April 2021	Paid at maturity
Yankee Gas 1.38% Series S First Mortgage Bonds	90.0		August 2021	August 2026	(2)
Yankee Gas 2.88% Series T First Mortgage Bonds	35.0		August 2021	August 2051	(2)
EGMA 2.11% Series A First Mortgage Bonds	310.0		September 2021	October 2031	(2)
EGMA 2.92% Series B First Mortgage Bonds	240.0		September 2021	October 2051	(2)
NSTAR Gas 2.25% Series T First Mortgage Bonds	40.0		October 2021	November 2031	(2)
NSTAR Gas 3.03% Series U First Mortgage Bonds	40.0		October 2021	November 2051	(2)

(1)    On August 10, 2021, Eversource Parent issued $350 million of floating rate Series T Senior Notes with a maturity date of August 15, 2023. The notes have a coupon rate based on the Compounded SOFR plus 0.25%.

(2)    The use of proceeds from these various issuances refinanced existing indebtedness, funded capital expenditures and were for general corporate purposes. The EGMA indebtedness that was refinanced included $309.4 million of long-term debt.

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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES (Tables)

9 Months Ended

Sep. 30, 2021

Rate Reduction Bonds and Variable Interest Entity [Abstract]

Summary of the Impact of Funding on the Balance Sheets and Income Statements

The following tables summarize the impact of PSNH Funding on PSNH's balance sheets and income statements:

(Millions of Dollars)
PSNH Balance Sheets:	As of September 30, 2021		As of December 31, 2020
Restricted Cash - Current Portion (included in Current Assets)	$	18.3	$	36.8
Restricted Cash - Long-Term Portion (included in Other Long-Term Assets)	3.2		2.1
Securitized Stranded Cost (included in Regulatory Assets)	489.7		522.1
Other Regulatory Liabilities (included in Regulatory Liabilities)	8.0		9.1
Accrued Interest (included in Other Current Liabilities)	3.0		8.0
Rate Reduction Bonds - Current Portion	43.2		43.2
Rate Reduction Bonds - Long-Term Portion	453.7		496.9

(Millions of Dollars) PSNH Income Statements:	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	$	10.8	$	10.8	$	32.4	$	32.4
Interest Expense on RRB Principal (included in Interest Expense)	4.5		4.9		13.9		14.9

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)

9 Months Ended

Sep. 30, 2021

Postemployment Benefits [Abstract]

Components of Net Periodic Benefit Expense/(Income)

The components of net periodic benefit plan expense/(income) for the Pension, SERP and PBOP Plans, prior to amounts capitalized as Property, Plant and Equipment or deferred as regulatory assets for future recovery, are shown below.  The service cost component of net periodic benefit plan expense/(income), less the capitalized portion, is included in Operations and Maintenance expense on the statements of income. The remaining components of net periodic benefit plan expense/(income), less the deferred portion, are included in Other Income, Net on the statements of income. Pension, SERP and PBOP expense reflected in the statements of cash flows for CL&P, NSTAR Electric and PSNH does not include intercompany allocations of net periodic benefit plan expense/(income), as these amounts are cash settled on a short-term basis.

	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2021								For the Three Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	21.5	$	5.6	$	4.0	$	2.2	$	3.3	$	0.5	$	0.6	$	0.3
Interest Cost	32.5		6.7		6.7		3.7		4.3		0.8		1.1		0.4
Expected Return on Plan Assets	(109.5)		(21.7)		(27.1)		(11.9)		(19.8)		(2.5)		(9.2)		(1.6)
Actuarial Loss	60.7		10.8		15.3		5.3		2.0		0.4		0.5		0.1
Prior Service Cost/(Credit)	0.3		—		0.1		—		(5.3)		0.3		(4.3)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	5.5	$	1.4	$	(1.0)	$	(0.7)	$	(15.5)	$	(0.5)	$	(11.3)	$	(0.7)
Intercompany Expense/(Income) Allocations	N/A		$	2.2	$	2.4	$	0.7	N/A		$	(0.4)	$	(0.5)	$	(0.2)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2021
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	64.3	$	17.4	$	11.9	$	6.6	$	10.1	$	1.7	$	1.8	$	0.9
Interest Cost	97.5		20.7		20.1		10.9		12.9		2.4		3.3		1.3
Expected Return on Plan Assets	(328.0)		(65.0)		(81.1)		(35.6)		(59.3)		(7.7)		(27.7)		(4.6)
Actuarial Loss	183.1		34.6		46.1		15.4		5.9		1.2		1.6		0.4
Prior Service Cost/(Credit)	1.1		—		0.3		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	18.0	$	7.7	$	(2.7)	$	(2.7)	$	(46.3)	$	(1.6)	$	(33.7)	$	(1.7)
Intercompany Expense/(Income) Allocations	N/A		$	5.8	$	6.4	$	1.9	N/A		$	(1.3)	$	(1.5)	$	(0.5)

	Pension and SERP								PBOP
	For the Three Months Ended September 30, 2020								For the Three Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	18.7	$	5.4	$	3.8	$	2.0	$	2.4	$	0.4	$	0.5	$	0.2
Interest Cost	44.4		9.3		9.7		4.8		6.1		1.1		1.7		0.7
Expected Return on Plan Assets	(99.2)		(19.8)		(25.7)		(11.1)		(18.3)		(2.5)		(8.5)		(1.4)
Actuarial Loss	50.7		9.7		14.0		3.8		2.2		0.3		0.6		0.2
Prior Service Cost/(Credit)	0.2		—		—		—		(5.3)		0.3		(4.2)		0.1
Total Net Periodic Benefit Plan Expense/(Income)	$	14.8	$	4.6	$	1.8	$	(0.5)	$	(12.9)	$	(0.4)	$	(9.9)	$	(0.2)
Intercompany Expense/(Income) Allocations	N/A		$	2.4	$	2.3	$	0.8	N/A		$	(0.3)	$	(0.4)	$	(0.1)
	Pension and SERP								PBOP
	For the Nine Months Ended September 30, 2020								For the Nine Months Ended September 30, 2020
(Millions of Dollars)	Eversource		CL&P		NSTAR Electric		PSNH		Eversource		CL&P		NSTAR Electric		PSNH
Service Cost	$	57.0	$	16.5	$	11.4	$	6.2	$	7.3	$	1.3	$	1.6	$	0.6
Interest Cost	133.0		28.1		29.0		14.5		18.3		3.3		5.0		2.1
Expected Return on Plan Assets	(298.8)		(59.6)		(77.2)		(33.5)		(55.1)		(7.4)		(25.5)		(4.2)
Actuarial Loss	150.7		29.4		41.3		11.8		6.3		0.9		1.8		0.6
Prior Service Cost/(Credit)	0.8		—		0.2		—		(15.9)		0.8		(12.7)		0.3
Total Net Periodic Benefit Plan Expense/(Income)	$	42.7	$	14.4	$	4.7	$	(1.0)	$	(39.1)	$	(1.1)	$	(29.8)	$	(0.6)
Intercompany Expense/(Income) Allocations	N/A		$	6.7	$	6.5	$	2.2	N/A		$	(0.9)	$	(1.0)	$	(0.4)

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COMMITMENTS AND CONTINGENCIES (Tables)

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Environmental Sites and Related Reserves

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

	As of September 30, 2021			As of December 31, 2020
	Number of Sites	Reserve (in millions)		Number of Sites	Reserve (in millions)
Eversource	62	$	111.9	63	$	102.4
CL&P	14	12.5		15	12.3
NSTAR Electric	12	3.7		12	4.7
PSNH	9	6.4		9	7.1

Non-Cancelable Commitments under Purchase Commitment Contracts

Renewable energy contracts include non-cancelable commitments under contracts of NSTAR Electric for the purchase of energy and RECs from renewable energy facilities.

NSTAR Electric
(Millions of Dollars)	2021		2022		2023		2024		2025		Thereafter		Total
Renewable Energy	$	27.1	$	103.9	$	230.5	$	341.2	$	348.1	$	6,564.2	$	7,615.0

Summary of Exposure to Guarantees and Indemnifications

The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties:  

As of September 30, 2021
Company (Obligor)	Description	Maximum Exposure (in millions)		Expiration Dates
North East Offshore LLC	Construction-related purchase agreements with third-party contractors (1)	$	1,093.5	(1)
Eversource Investment LLC	Funding and indemnification obligations of North East Offshore LLC (2)	—		(2)
Sunrise Wind LLC	OREC capacity production (3)	2.2		(3)
Sunrise Wind LLC	Construction-related purchase agreements with third-party contractors (4)	386.4		—
South Fork Wind, LLC	Transmission interconnection	1.2		—
South Fork Wind, LLC	Construction-related purchase agreements with third-party contractors (5)	40.6		2023
Bay State Wind LLC	Real estate purchase	2.5		2022
Various	Surety bonds (6)	67.5		2021 - 2023
Rocky River Realty Company and    Eversource Service	Lease payments for real estate	4.0		2024

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contactors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 2, below. The guarantee expires upon the full performance of the guaranteed obligations.    

(2)    Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the Amended and Restated Limited Liability Company Operating Agreement of NEO, in an aggregate amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations.

(3)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed on October 23, 2019, by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations.    

(4)     Eversource parent issued a guaranty on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $420.6 million, in connection with a construction-related purchase agreement. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) April 14, 2026 and (ii) full performance of the guaranteed obligations.

(5)    Eversource parent issued two guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with two construction-related purchase agreements. Under one guarantee, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $25.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 4, 2023 and (ii) full performance of the guaranteed obligations. Under the second guaranty, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $14.8 million. Eversource parent’s obligations under the guarantee expire upon the earlier of (i) October 18, 2023 and (ii) full performance of the guaranteed obligations.

(6)    Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Carrying Amounts and Estimated Fair Values of Financial Instruments

Carrying amounts and estimated fair values are as follows:

	Eversource				CL&P				NSTAR Electric				PSNH
(Millions of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
As of September 30, 2021:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	165.5	$	116.2	$	121.4	$	43.0	$	44.1	$	—	$	—
Long-Term Debt	18,219.2		19,810.9		4,215.1		4,865.2		3,984.7		4,494.3		1,163.6		1,228.9
Rate Reduction Bonds	496.9		555.8		—		—		—		—		496.9		555.8
As of December 31, 2020:
Preferred Stock Not Subject to Mandatory Redemption	$	155.6	$	169.1	$	116.2	$	123.4	$	43.0	$	45.7	$	—	$	—
Long-Term Debt	16,179.1		18,420.1		3,914.8		4,800.9		3,643.2		4,294.0		1,099.1		1,207.0
Rate Reduction Bonds	540.1		603.4		—		—		—		—		540.1		603.4

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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Changes in Accumulated Other Comprehensive Income/(Loss) by Component, Net of Tax

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

	For the Nine Months Ended September 30, 2021								For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Qualified Cash Flow Hedging Instruments		Unrealized Gains/(Losses) on Marketable Securities		Defined Benefit Plans		Total		Qualified Cash Flow Hedging Instruments		Unrealized Gains on Marketable Securities		Defined Benefit Plans		Total
Balance as of Beginning of Period	$	(1.4)	$	1.1	$	(76.1)	$	(76.4)	$	(3.0)	$	0.7	$	(62.8)	$	(65.1)
OCI Before Reclassifications	—		(0.6)		(2.4)		(3.0)		—		0.3		(1.6)		(1.3)
Amounts Reclassified from AOCI	1.0		—		6.5		7.5		1.2		—		4.8		6.0
Net OCI	1.0		(0.6)		4.1		4.5		1.2		0.3		3.2		4.7
Balance as of End of Period	$	(0.4)	$	0.5	$	(72.0)	$	(71.9)	$	(1.8)	$	1.0	$	(59.6)	$	(60.4)

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COMMON SHARES (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Common Shares Authorized and Issued

The following table sets forth the Eversource parent common shares and the shares of common stock of CL&P, NSTAR Electric and PSNH that were authorized and issued, as well as the respective per share par values:  

	Shares
			Authorized as of September 30, 2021 and December 31, 2020	Issued as of
	Par Value			September 30, 2021	December 31, 2020
Eversource	$	5	380,000,000	357,818,402	357,818,402
CL&P	$	10	24,500,000	6,035,205	6,035,205
NSTAR Electric	$	1	100,000,000	200	200
PSNH	$	1	100,000,000	301	301

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Components of Basic and Diluted EPS

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

Eversource (Millions of Dollars, except share information)	For the Three Months Ended				For the Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
Net Income Attributable to Common Shareholders	$	283.2	$	346.3	$	913.8	$	933.2
Weighted Average Common Shares Outstanding:
Basic	344,023,846		343,076,614		343,848,905		337,375,172
Dilutive Effect of:
Share-Based Compensation Awards and Other	645,936		696,988		631,151		686,403
Equity Forward Sale Agreement	—		—		—		362,525
Total Dilutive Effect	645,936		696,988		631,151		1,048,928
Diluted	344,669,782		343,773,602		344,480,056		338,424,100
Basic EPS	$	0.82	$	1.01	$	2.66	$	2.77
Diluted EPS	$	0.82	$	1.01	$	2.65	$	2.76

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REVENUES (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Operating Revenues Disaggregated by Revenue Source

The following tables present operating revenues disaggregated by revenue source:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,146.8	$	81.7	$	—	$	39.1	$	—	$	—	$	1,267.6
Commercial	748.8		59.0		—		17.2		—		(1.4)		823.6
Industrial	96.2		28.6		—		1.1		—		(4.8)		121.1
Total Retail Tariff Sales Revenues	1,991.8		169.3		—		57.4		—		(6.2)		2,212.3
Wholesale Transmission Revenues	—		—		527.2		—		23.0		(408.5)		141.7
Wholesale Market Sales Revenues	133.8		12.2		—		1.1		—		—		147.1
Other Revenues from Contracts with Customers	29.6		1.2		3.5		1.8		303.1		(301.4)		37.8
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(0.9)		—		—		(94.3)
Total Revenues from Contracts with Customers	2,061.8		182.7		530.7		59.4		326.1		(716.1)		2,444.6
Alternative Revenue Programs	(7.9)		2.7		(112.6)		2.3		—		102.0		(13.5)
Other Revenues (2)	1.3		0.1		0.2		0.1		—		—		1.7
Total Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,094.9	$	722.8	$	—	$	102.8	$	—	$	—	$	3,920.5
Commercial	1,902.9		356.4		—		47.0		—		(4.1)		2,302.2
Industrial	261.1		119.5		—		3.3		—		(12.8)		371.1
Total Retail Tariff Sales Revenues	5,258.9		1,198.7		—		153.1		—		(16.9)		6,593.8
Wholesale Transmission Revenues	—		—		1,338.4		—		62.5		(1,075.4)		325.5
Wholesale Market Sales Revenues	380.1		54.1		—		3.0		—		—		437.2
Other Revenues from Contracts with Customers	68.4		3.6		10.2		5.5		936.6		(929.6)		94.7
Reserve for Revenues Subject to Refund (1)	(93.4)		—		—		(2.2)		—		—		(95.6)
Total Revenues from Contracts with Customers	5,614.0		1,256.4		1,348.6		159.4		999.1		(2,021.9)		7,355.6
Alternative Revenue Programs	14.9		21.3		(119.2)		1.3		—		103.0		21.3
Other Revenues (2)	3.2		0.1		0.7		0.3		—		—		4.3
Total Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2

	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,183.9	$	45.5	$	—	$	45.8	$	—	$	—	$	1,275.2
Commercial	682.7		41.1		—		17.1		—		(1.4)		739.5
Industrial	91.0		17.5		—		1.3		—		(3.6)		106.2
Total Retail Tariff Sales Revenues	1,957.6		104.1		—		64.2		—		(5.0)		2,120.9
Wholesale Transmission Revenues	—		—		458.2		—		19.0		(365.6)		111.6
Wholesale Market Sales Revenues	79.6		8.7		—		1.1		—		—		89.4
Other Revenues from Contracts with Customers	20.7		1.3		3.2		0.7		303.3		(299.0)		30.2
Total Revenues from Contracts with Customers	2,057.9		114.1		461.4		66.0		322.3		(669.6)		2,352.1
Alternative Revenue Programs	1.7		(4.0)		(72.3)		(2.0)		—		67.0		(9.6)
Other Revenues (2)	0.7		0.1		0.2		0.1		—		—		1.1
Total Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	3,063.7	$	399.6	$	—	$	113.2	$	—	$	—	$	3,576.5
Commercial	1,815.7		243.5		—		47.7		—		(3.7)		2,103.2
Industrial	248.4		67.0		—		3.6		—		(10.1)		308.9
Total Retail Tariff Sales Revenues	5,127.8		710.1		—		164.5		—		(13.8)		5,988.6
Wholesale Transmission Revenues	—		—		1,177.9		—		55.6		(981.4)		252.1
Wholesale Market Sales Revenues	231.1		31.9		—		2.9		—		—		265.9
Other Revenues from Contracts with Customers	63.3		4.1		9.9		2.8		845.1		(838.0)		87.2
Total Revenues from Contracts with Customers	5,422.2		746.1		1,187.8		170.2		900.7		(1,833.2)		6,593.8
Alternative Revenue Programs	54.8		22.9		(52.7)		(4.1)		—		48.9		69.8
Other Revenues (2)	4.9		1.0		0.5		0.5		—		—		6.9
Total Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5

	For the Three Months Ended September 30, 2021						For the Three Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	572.0	$	401.9	$	172.9	$	608.7	$	415.4	$	159.8
Commercial	249.4		411.3		88.5		244.7		358.3		80.1
Industrial	35.0		35.9		25.3		38.0		30.6		22.4
Total Retail Tariff Sales Revenues	856.4		849.1		286.7		891.4		804.3		262.3
Wholesale Transmission Revenues	268.2		171.0		88.0		233.3		153.1		71.8
Wholesale Market Sales Revenues	100.3		21.3		12.2		60.0		12.1		7.5
Other Revenues from Contracts with Customers	12.1		14.3		7.3		8.1		10.5		3.7
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		2.3
Total Revenues from Contracts with Customers	1,143.6		1,055.7		394.2		1,192.8		980.0		347.6
Alternative Revenue Programs	(82.0)		(14.4)		(24.1)		(65.0)		8.2		(13.8)
Other Revenues (2)	0.2		0.7		0.6		0.2		0.7		—
Eliminations	(142.2)		(123.3)		(55.8)		(133.7)		(113.5)		(50.1)
Total Operating Revenues	$	919.6	$	918.7	$	314.9	$	994.3	$	875.4	$	283.7

	For the Nine Months Ended September 30, 2021						For the Nine Months Ended September 30, 2020
(Millions of Dollars)	CL&P		NSTAR Electric		PSNH		CL&P		NSTAR Electric		PSNH
Revenues from Contracts with Customers
Retail Tariff Sales
Residential	$	1,558.6	$	1,069.0	$	467.3	$	1,567.9	$	1,057.9	$	437.9
Commercial	679.3		975.7		249.2		670.4		921.3		225.3
Industrial	100.2		89.5		71.4		105.3		82.1		61.0
Total Retail Tariff Sales Revenues	2,338.1		2,134.2		787.9		2,343.6		2,061.3		724.2
Wholesale Transmission Revenues	652.8		478.2		207.4		576.5		430.3		171.1
Wholesale Market Sales Revenues	278.1		64.7		37.3		163.9		39.8		27.4
Other Revenues from Contracts with Customers	28.8		36.8		14.9		25.1		32.4		10.9
(Reserve for)/Amortization of Revenues   Subject to Refund (1)	(93.4)		—		—		—		—		6.9
Total Revenues from Contracts with Customers	3,204.4		2,713.9		1,047.5		3,109.1		2,563.8		940.5
Alternative Revenue Programs	(74.2)		(11.3)		(18.8)		(27.8)		31.1		(1.2)
Other Revenues (2)	0.3		2.5		1.1		2.0		2.8		0.6
Eliminations	(394.0)		(362.0)		(142.6)		(371.9)		(327.5)		(124.6)
Total Operating Revenues	$	2,736.5	$	2,343.1	$	887.2	$	2,711.4	$	2,270.2	$	815.3

(1)    The Electric Distribution segment 2021 revenue subject to refund amount relates to an October 1, 2021 CL&P settlement agreement with the DEEP, OCC, AG and the Connecticut Industrial Energy Consumers, which resolved certain issues that arose in pending regulatory proceedings initiated by the PURA. In the third quarter of 2021, CL&P recorded a reduction to Operating Revenues of $65 million on the income statement for a reserve for customer credits associated with the provisions of the settlement agreement. Additionally, CL&P recorded a $28.4 million reserve in the first quarter of 2021 for a civil penalty for non-compliance with storm performance standards to be credited to customers. The penalty was reclassified from Operations and Maintenance expense to a reduction of Operating Revenues in the third quarter of 2021 in connection with the finalization of the settlement agreement. In total, the reserve for revenues subject to refund totaled $93.4 million and was recorded as a current regulatory liability on CL&P’s balance sheet and as a reduction to Operating Revenues on the nine months ended September 30, 2021 income statement. See Note 9G, “Commitments and Contingencies - CL&P Regulatory Matters,” for further information.

(2)    Other Revenues include certain fees charged to customers that are not considered revenue from contracts with customers. Other Revenues also include lease revenues under lessor accounting guidance of $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) and $1.1 million (including $0.2 million at CL&P and $0.7 million at NSTAR Electric) for the three months ended September 30, 2021 and 2020, respectively, and $3.8 million (including $0.6 million at CL&P and $2.5 million at NSTAR Electric) and $3.2 million (including $0.6 million at CL&P and $2.1 million at NSTAR Electric) for the nine months ended September 30, 2021 and 2020, respectively.

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SEGMENT INFORMATION (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Summary of Segment Information and Segmented Total Assets

Eversource's segment information is as follows:

	For the Three Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	2,055.2	$	185.5	$	418.3	$	61.8	$	326.1	$	(614.1)	$	2,432.8
Depreciation and Amortization	(179.8)		(28.5)		(75.4)		(11.5)		(28.0)		1.1		(322.1)
Other Operating Expenses	(1,640.5)		(176.9)		(122.4)		(26.1)		(275.2)		613.7		(1,627.4)
Operating Income/(Loss)	$	234.9	$	(19.9)	$	220.5	$	24.2	$	22.9	$	0.7	$	483.3
Interest Expense	$	(61.0)	$	(15.7)	$	(33.5)	$	(8.0)	$	(42.5)	$	12.7	$	(148.0)
Other Income, Net	25.4		6.7		5.0		1.2		325.9		(320.4)		43.8
Net Income/(Loss) Attributable to Common    Shareholders	150.4		(22.0)		139.4		17.5		304.9		(307.0)		283.2
	For the Nine Months Ended September 30, 2021
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
Operating Revenues	$	5,632.1	$	1,277.8	$	1,230.1	$	161.0	$	999.1	$	(1,918.9)	$	7,381.2
Depreciation and Amortization	(534.1)		(108.7)		(223.4)		(34.3)		(83.7)		3.1		(981.1)
Other Operating Expenses	(4,531.3)		(970.6)		(359.6)		(76.7)		(860.3)		1,918.9		(4,879.6)
Operating Income	$	566.7	$	198.5	$	647.1	$	50.0	$	55.1	$	3.1	$	1,520.5
Interest Expense	$	(175.4)	$	(44.2)	$	(98.7)	$	(24.0)	$	(125.9)	$	37.0	$	(431.2)
Other Income, Net	76.0		15.2		17.3		3.1		1,059.2		(1,046.2)		124.6
Net Income Attributable to Common Shareholders	365.4		129.6		412.4		30.0		982.5		(1,006.1)		913.8
Cash Flows Used for Investments in Plant	764.9		506.4		691.0		91.2		157.6		—		2,211.1

	For the Three Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	2,060.3	$	110.2	$	389.3	$	64.1	$	322.3	$	(602.6)	$	2,343.6
Depreciation and Amortization	(182.0)		(14.8)		(70.6)		(10.8)		(24.1)		0.3		(302.0)
Other Operating Expenses	(1,577.0)		(104.2)		(120.6)		(10.2)		(271.5)		603.1		(1,480.4)
Operating Income/(Loss)	$	301.3	$	(8.8)	$	198.1	$	43.1	$	26.7	$	0.8	$	561.2
Interest Expense	$	(53.3)	$	(10.1)	$	(31.1)	$	(8.0)	$	(38.7)	$	7.1	$	(134.1)
Other Income, Net	16.0		0.7		6.9		1.6		401.0		(397.0)		29.2
Net Income/(Loss) Attributable to Common    Shareholders	205.5		(15.4)		125.6		23.1		396.6		(389.1)		346.3
	For the Nine Months Ended September 30, 2020
Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution (1)		Electric Transmission		Water Distribution		Other (1)		Eliminations (1)		Total
Operating Revenues	$	5,481.9	$	770.0	$	1,135.6	$	166.6	$	900.7	$	(1,784.3)	$	6,670.5
Depreciation and Amortization	(490.0)		(55.1)		(206.8)		(33.1)		(68.1)		1.2		(851.9)
Other Operating Expenses	(4,309.9)		(592.0)		(338.5)		(60.7)		(771.4)		1,787.9		(4,284.6)
Operating Income	$	682.0	$	122.9	$	590.3	$	72.8	$	61.2	$	4.8	$	1,534.0
Interest Expense	$	(160.7)	$	(32.1)	$	(93.8)	$	(25.1)	$	(119.0)	$	27.6	$	(403.1)
Other Income, Net	44.9		2.5		22.7		1.7		1,087.9		(1,076.1)		83.6
Net Income Attributable to Common Shareholders	450.6		73.3		381.8		35.6		1,035.6		(1,043.7)		933.2
Cash Flows Used for Investments in Plant	781.2		322.8		732.4		84.0		181.2		—		2,101.6

(1)    On October 9, 2020, Eversource completed the CMA asset acquisition, with Yankee Energy System, Inc. (Yankee parent) as the acquiring entity. Yankee parent is the parent company of Yankee Gas, NSTAR Gas, EGMA and Hopkinton LNG Corp. As a result of the acquisition, in the fourth quarter of 2020, our chief operating decision maker assessed the performance of the Natural Gas Distribution segment including Yankee parent. Previously, Yankee parent was presented within Other and its equity in earnings were eliminated in consolidation. Prior comparative periods were revised to conform to the current period segment presentation.

The following table summarizes Eversource's segmented total assets:

Eversource (Millions of Dollars)	Electric Distribution		Natural Gas Distribution		Electric Transmission		Water Distribution		Other		Eliminations		Total
As of September 30, 2021	$	25,604.2	$	6,865.6	$	12,123.5	$	2,444.9	$	21,624.5	$	(20,648.6)	$	48,014.1
As of December 31, 2020	24,981.9		6,450.5		11,695.0		2,375.2		22,089.4		(21,492.4)		46,099.6

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ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS (Tables)

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Preliminary Allocation of the Cash Purchase Price

The preliminary allocation of the cash purchase price is as follows:

(Millions of Dollars)
Current Assets	$	138
Restricted Cash	57
PP&E	1,184
Goodwill	50
Other Noncurrent Assets, excluding Goodwill	131
Other Current Liabilities	(81)
Other Noncurrent Liabilities	(310)
Cash Purchase Price	$	1,169

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) customer in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) customer utility	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary of Accounting Policies [Line Items]
Number of electric, natural gas and water customers | customer		4.3
Allowance for uncollectible accounts for late fees and other receivable amounts	$ 441.7	$ 441.7	$ 425.8	$ 358.9	$ 295.0	$ 270.0	$ 224.8
COVID-19
Summary of Accounting Policies [Line Items]
Increase (decrease) in the allowance for uncollectible accounts	(6.5)	25.8
Allowance for uncollectible accounts for late fees and other receivable amounts	57.0	57.0
CL&P
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	195.5	$ 195.5	188.8	157.4	150.8	136.7	97.3
Period of accounts receivable recoverable under financial or medical duress		180 days
CL&P | COVID-19
Summary of Accounting Policies [Line Items]
Increase (decrease) in the allowance for uncollectible accounts	4.0	$ 16.3
Allowance for uncollectible accounts for late fees and other receivable amounts	20.1	20.1
NSTAR Electric
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	105.0	105.0	98.0	91.6	76.8	68.7	75.4
NSTAR Electric | COVID-19
Summary of Accounting Policies [Line Items]
Increase (decrease) in the allowance for uncollectible accounts	(8.3)	(1.8)
Allowance for uncollectible accounts for late fees and other receivable amounts	8.5	8.5
PSNH
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts	17.0	17.0	$ 17.2	$ 17.2	$ 14.0	$ 11.8	$ 10.5
PSNH | COVID-19
Summary of Accounting Policies [Line Items]
Reversal of deferred net incremental COVID-19 costs		0.6
EGMA | Other Long-Term Assets
Summary of Accounting Policies [Line Items]
Restricted cash	41.5	41.5
Natural Gas Businesses | COVID-19
Summary of Accounting Policies [Line Items]
Increase (decrease) in the allowance for uncollectible accounts	(2.2)	12.5
Allowance for uncollectible accounts for late fees and other receivable amounts	$ 27.4	$ 27.4
Yankee Gas
Summary of Accounting Policies [Line Items]
Period of accounts receivable recoverable under financial or medical duress		90 days
Connecticut, Massachusetts and New Hampshire
Summary of Accounting Policies [Line Items]
Number of regulated utilities | utility		9

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 425,800	$ 270,000	$ 358,900	$ 224,800
Uncollectible Expense	12,000	10,500	39,690	31,101
Uncollectible Costs Deferred	24,500	30,500	98,100	66,400
Write-Offs	(24,400)	(19,100)	(65,800)	(61,600)
Recoveries Collected	3,800	3,100	10,800	10,500
Ending Balance	441,700	295,000	441,700	295,000
Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				23,800
CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	188,800	136,700	157,400	97,300
Uncollectible Expense	3,600	3,800	10,183	10,013
Uncollectible Costs Deferred	10,200	16,100	47,100	41,000
Write-Offs	(8,900)	(7,200)	(23,500)	(24,000)
Recoveries Collected	1,800	1,400	4,300	4,300
Ending Balance	195,500	150,800	195,500	150,800
CL&P | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				22,200
NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	98,000	68,700	91,600	75,400
Uncollectible Expense	5,100	4,500	12,477	11,321
Uncollectible Costs Deferred	8,300	9,100	20,100	8,900
Write-Offs	(7,500)	(6,500)	(23,000)	(21,300)
Recoveries Collected	1,100	1,000	3,800	3,800
Ending Balance	105,000	76,800	105,000	76,800
NSTAR Electric | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				(1,300)
PSNH
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	17,200	11,800	17,200	10,500
Uncollectible Expense	1,200	800	4,381	2,058
Uncollectible Costs Deferred	1,200	3,200	2,000	5,600
Write-Offs	(2,800)	(2,000)	(7,300)	(5,000)
Recoveries Collected	200	200	700	500
Ending Balance	17,000	14,000	17,000	14,000
PSNH | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				300
Hardship Accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	210,700	175,500	194,800	143,300
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	22,800	10,100	44,800	24,900
Write-Offs	(3,900)	(7,300)	(10,600)	(12,300)
Recoveries Collected	300	400	900	1,200
Ending Balance	229,900	178,700	229,900	178,700
Hardship Accounts | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				21,600
Hardship Accounts | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	145,600	116,300	129,100	80,100
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	4,500	11,200	25,700	32,700
Write-Offs	(3,500)	(2,600)	(8,700)	(10,000)
Recoveries Collected	200	300	700	1,100
Ending Balance	146,800	125,200	146,800	125,200
Hardship Accounts | CL&P | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				21,300
Hardship Accounts | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	35,900	34,600	39,700	43,900
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	11,800	(1,300)	8,300	(8,400)
Write-Offs	(100)	(200)	(400)	(800)
Recoveries Collected	0	0	0	0
Ending Balance	47,600	33,100	47,600	33,100
Hardship Accounts | NSTAR Electric | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				(1,600)
Retail (Non-Hardship), Wholesale, and Other Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	215,100	94,500	164,100	81,500
Uncollectible Expense	12,000	10,500	39,700	31,100
Uncollectible Costs Deferred	1,700	20,400	53,300	41,500
Write-Offs	(20,500)	(11,800)	(55,200)	(49,300)
Recoveries Collected	3,500	2,700	9,900	9,300
Ending Balance	211,800	116,300	211,800	116,300
Retail (Non-Hardship), Wholesale, and Other Receivables | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				2,200
Retail (Non-Hardship), Wholesale, and Other Receivables | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	43,200	20,400	28,300	17,200
Uncollectible Expense	3,600	3,800	10,200	10,000
Uncollectible Costs Deferred	5,700	4,900	21,400	8,300
Write-Offs	(5,400)	(4,600)	(14,800)	(14,000)
Recoveries Collected	1,600	1,100	3,600	3,200
Ending Balance	48,700	25,600	48,700	25,600
Retail (Non-Hardship), Wholesale, and Other Receivables | CL&P | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				900
Retail (Non-Hardship), Wholesale, and Other Receivables | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	62,100	34,100	51,900	31,500
Uncollectible Expense	5,100	4,500	12,500	11,300
Uncollectible Costs Deferred	(3,500)	10,400	11,800	17,300
Write-Offs	(7,400)	(6,300)	(22,600)	(20,500)
Recoveries Collected	1,100	1,000	3,800	3,800
Ending Balance	$ 57,400	$ 43,700	$ 57,400	43,700
Retail (Non-Hardship), Wholesale, and Other Receivables | NSTAR Electric | Restatement Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				$ 300

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of Accounting Policies [Line Items]
Other income, net	$ 43,768	$ 29,218	$ 124,588	$ 83,565
Pension, SERP and PBOP Non-Service   Income Components
Summary of Accounting Policies [Line Items]
Other income, net	21,700	11,000	63,900	34,300
AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	10,300	10,300	28,700	31,800
Equity in Earnings of Unconsolidated Affiliates (1)
Summary of Accounting Policies [Line Items]
Other income, net	4,900	3,900	13,300	13,800
Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(600)	1,000	700	(1,500)
Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	7,300	1,500	17,200	3,300
Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	1,500	100	1,800
Other
Summary of Accounting Policies [Line Items]
Other income, net	200	0	700	100
Equity In Earnings
Summary of Accounting Policies [Line Items]
Unrealized gain associated with investment			2,100	2,400
CL&P
Summary of Accounting Policies [Line Items]
Other income, net	6,903	5,917	21,690	16,273
CL&P | Pension, SERP and PBOP Non-Service   Income Components
Summary of Accounting Policies [Line Items]
Other income, net	4,200	900	11,200	3,000
CL&P | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	1,700	3,500	5,100	11,400
CL&P | Equity in Earnings of Unconsolidated Affiliates (1)
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
CL&P | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(300)	1,300	1,200	0
CL&P | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	1,300	200	4,100	1,800
CL&P | Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
CL&P | Other
Summary of Accounting Policies [Line Items]
Other income, net	0	0	100	100
NSTAR Electric
Summary of Accounting Policies [Line Items]
Other income, net	20,215	12,802	58,941	38,152
NSTAR Electric | Pension, SERP and PBOP Non-Service   Income Components
Summary of Accounting Policies [Line Items]
Other income, net	10,100	7,200	30,300	22,200
NSTAR Electric | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	6,200	5,500	18,600	15,800
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates (1)
Summary of Accounting Policies [Line Items]
Other income, net	100	100	300	400
NSTAR Electric | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(200)	(200)	600	(1,500)
NSTAR Electric | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	3,900	100	8,800	700
NSTAR Electric | Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	300
NSTAR Electric | Other
Summary of Accounting Policies [Line Items]
Other income, net	100	100	300	300
PSNH
Summary of Accounting Policies [Line Items]
Other income, net	3,171	4,065	11,598	10,882
PSNH | Pension, SERP and PBOP Non-Service   Income Components
Summary of Accounting Policies [Line Items]
Other income, net	2,500	1,800	7,900	5,200
PSNH | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	300	900	1,200	3,500
PSNH | Equity in Earnings of Unconsolidated Affiliates (1)
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
PSNH | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(100)	200	300	100
PSNH | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	400	1,200	2,000	2,000
PSNH | Gain on Sale of Property
Summary of Accounting Policies [Line Items]
Other income, net	0	0	100	0
PSNH | Other
Summary of Accounting Policies [Line Items]
Other income, net	$ 100	$ 0	$ 100	$ 100

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 49.4	$ 48.4	$ 137.9	$ 129.1
CL&P
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 46.1	$ 45.6	$ 120.7	$ 114.2

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-cash Investing Activities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 359.6	$ 357.4
CL&P
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	75.3	97.8
NSTAR Electric
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	94.2	92.6
PSNH
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 32.8	$ 50.0

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash as reported on the Balance Sheets	$ 88,204	$ 106,599
Cash and Restricted Cash as reported on the Statements of Cash Flows	218,129	264,950	$ 829,003	$ 117,063
Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	55,500	73,600
Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	29,700	41,200
Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	44,700	43,600
CL&P
Restricted Cash and Cash Equivalents Items [Line Items]
Cash as reported on the Balance Sheets	62,791	90,801
Cash and Restricted Cash as reported on the Statements of Cash Flows	71,762	99,809	17,235	4,971
CL&P | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	8,700	8,700
CL&P | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	300	300
CL&P | Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	0
NSTAR Electric
Restricted Cash and Cash Equivalents Items [Line Items]
Cash as reported on the Balance Sheets	3,538	102
Cash and Restricted Cash as reported on the Statements of Cash Flows	20,838	17,410	12,409	6,312
NSTAR Electric | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,200	17,200
NSTAR Electric | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	100	100
NSTAR Electric | Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	0
PSNH
Restricted Cash and Cash Equivalents Items [Line Items]
Cash as reported on the Balance Sheets	3,869	141
Cash and Restricted Cash as reported on the Statements of Cash Flows	26,173	39,555	$ 22,595	$ 36,688
PSNH | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	18,600	36,800
PSNH | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	500	600
PSNH | Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 3,200	$ 2,100

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REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 6,475,200	$ 6,569,900
Less:  Current Portion	1,016,304	1,076,556
Total Long-Term Regulatory Assets	5,458,928	5,493,330
Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	2,566,100	2,794,200
Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	756,400	747,100
Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	489,700	522,100
Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	944,200	765,600
Regulatory Tracker Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	883,000	850,500
Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	265,300	296,300
Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	302,000	314,700
Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	121,600	118,400
Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	146,900	161,000
CL&P
Regulatory Assets [Line Items]
Total Regulatory Assets	2,307,100	2,211,800
Less:  Current Portion	325,268	345,622
Total Long-Term Regulatory Assets	1,981,805	1,866,152
CL&P | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	540,200	632,300
CL&P | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	458,100	458,900
CL&P | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	674,200	515,100
CL&P | Regulatory Tracker Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	304,600	246,600
CL&P | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	265,300	293,100
CL&P | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	33,700	32,100
CL&P | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	31,000	33,700
NSTAR Electric
Regulatory Assets [Line Items]
Total Regulatory Assets	1,636,100	1,703,900
Less:  Current Portion	388,408	399,882
Total Long-Term Regulatory Assets	1,247,715	1,304,019
NSTAR Electric | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	638,400	690,000
NSTAR Electric | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	113,800	110,400
NSTAR Electric | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	198,100	186,400
NSTAR Electric | Regulatory Tracker Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	320,000	332,200
NSTAR Electric | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	259,300	270,200
NSTAR Electric | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	57,800	58,600
NSTAR Electric | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	48,700	56,100
PSNH
Regulatory Assets [Line Items]
Total Regulatory Assets	927,700	989,100
Less:  Current Portion	97,948	115,852
Total Long-Term Regulatory Assets	829,848	873,203
PSNH | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	249,700	267,600
PSNH | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	18,700	15,200
PSNH | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	489,700	522,100
PSNH | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	71,900	64,100
PSNH | Regulatory Tracker Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	76,800	95,300
PSNH | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	4,000	3,900
PSNH | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 16,900	$ 20,900

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REGULATORY ACCOUNTING - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	May 06, 2021
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 260,600	$ 196,900
Regulatory costs	6,475,200	6,569,900
Regulatory Liabilities	612,931	389,430
Unfavorable Regulatory Action
Regulatory Assets [Line Items]
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards			$ 28,400
Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	944,200	765,600
COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs related to non-tracked uncollectible expense	34,500	15,800
Net incremental deferred costs	41,300	24,000
Tropical Storm Isaias | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	251,000
CL&P
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	111,200	84,100
Regulatory costs	2,307,100	2,211,800
Regulatory Liabilities	311,269	137,166
CL&P | Loss from Catastrophes
Regulatory Assets [Line Items]
Deferred pre-staging and storm restoration costs	195,000	344,000
CL&P | Unfavorable Regulatory Action
Regulatory Assets [Line Items]
Regulatory Liabilities	75,000
CL&P | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	674,200	515,100
CL&P | COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	15,900	4,700
CL&P | Tropical Storm Isaias | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	234,000
NSTAR Electric
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	85,100	69,800
Regulatory costs	1,636,100	1,703,900
Regulatory Liabilities	205,771	164,761
NSTAR Electric | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	198,100	186,400
NSTAR Electric | COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	10,900	11,900
PSNH
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	3,200	4,300
Regulatory costs	927,700	989,100
Regulatory Liabilities	96,817	58,756
PSNH | Storm Restoration Costs, Net
Regulatory Assets [Line Items]
Regulatory costs	$ 71,900	$ 64,100

XML

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,520,500	$ 4,240,200
Less:  Current Portion	612,931	389,430
Total Long-Term Regulatory Liabilities	3,907,582	3,850,781
EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,737,100	2,778,600
Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	676,700	624,800
Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	65,900	83,600
Regulatory Tracker Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	484,500	366,500
AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	79,600	76,800
CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	103,400	0
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	373,300	309,900
CL&P
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,524,800	1,342,100
Less:  Current Portion	311,269	137,166
Total Long-Term Regulatory Liabilities	1,213,469	1,204,942
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,001,500	1,010,700
CL&P | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	117,000	98,400
CL&P | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
CL&P | Regulatory Tracker Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	208,900	148,900
CL&P | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	43,600	44,600
CL&P | CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	103,400	0
CL&P | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	50,400	39,500
NSTAR Electric
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,767,400	1,715,200
Less:  Current Portion	205,771	164,761
Total Long-Term Regulatory Liabilities	1,561,572	1,550,390
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,025,600	1,044,000
NSTAR Electric | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	384,100	363,600
NSTAR Electric | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	56,500	72,500
NSTAR Electric | Regulatory Tracker Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	180,600	139,700
NSTAR Electric | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	36,000	32,200
NSTAR Electric | CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
NSTAR Electric | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	84,600	63,200
PSNH
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	486,200	442,000
Less:  Current Portion	96,817	58,756
Total Long-Term Regulatory Liabilities	389,426	383,183
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	363,900	371,500
PSNH | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	19,000	12,900
PSNH | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH | Regulatory Tracker Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	87,500	47,800
PSNH | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH | CL&P Settlement Agreement and Storm Performance Penalty
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 15,800	$ 9,800

XML

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	$ 17,257,300	$ 16,703,200
Distribution - Natural Gas	6,334,900	6,111,200
Transmission - Electric	12,396,200	11,954,000
Distribution - Water	1,771,100	1,743,100
Solar	200,400	201,500
Utility	37,959,900	36,713,000
Other	1,430,500	1,269,000
Property, Plant and Equipment, Gross	39,390,400	37,982,000
Less:  Accumulated Depreciation
Utility	(8,830,200)	(8,476,300)
Other	(550,000)	(477,600)
Total Accumulated Depreciation	(9,380,200)	(8,953,900)
Property, Plant and Equipment, Net	30,010,200	29,028,100
Construction Work in Progress	2,456,900	1,854,400
Total Property, Plant and Equipment, Net	32,467,069	30,882,523
CL&P
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	7,028,900	6,820,700
Transmission - Electric	5,707,900	5,512,000
Solar	0	0
Property, Plant and Equipment, Gross	12,736,800	12,332,700
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(2,574,600)	(2,475,400)
Property, Plant and Equipment, Net	10,162,200	9,857,300
Construction Work in Progress	436,600	377,300
Total Property, Plant and Equipment, Net	10,598,836	10,234,556
NSTAR Electric
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	7,798,800	7,544,400
Transmission - Electric	4,884,000	4,701,300
Solar	200,400	201,500
Property, Plant and Equipment, Gross	12,883,200	12,447,200
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(3,220,700)	(3,074,100)
Property, Plant and Equipment, Net	9,662,500	9,373,100
Construction Work in Progress	949,200	750,000
Total Property, Plant and Equipment, Net	10,611,728	10,123,062
PSNH
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	2,469,900	2,378,400
Transmission - Electric	1,805,900	1,742,400
Solar	0	0
Property, Plant and Equipment, Gross	4,275,800	4,120,800
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(895,400)	(848,900)
Property, Plant and Equipment, Net	3,380,400	3,271,900
Construction Work in Progress	148,700	102,400
Total Property, Plant and Equipment, Net	$ 3,529,050	$ 3,374,270

XML

DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Derivative Assets | CL&P | Level 3
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	$ 14.4	$ 13.7
Netting	(0.4)	(0.4)
Net Amount Recorded as a Derivative	14.0	13.3
Other Long-Term Assets | CL&P | Level 3
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	51.1	58.7
Netting	(1.6)	(1.8)
Net Amount Recorded as a Derivative	49.5	56.9
Current Derivative Liabilities | CL&P | Level 3
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(72.2)	(68.8)
Netting	0.0	0.0
Net Amount Recorded as a Derivative	(72.2)	(68.8)
Current Derivative Liabilities | Other | Level 2
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	0.0	(3.3)
Netting	0.0	0.1
Net Amount Recorded as a Derivative	0.0	(3.2)
Long-Term Derivative Liabilities | CL&P | Level 3
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(256.6)	(294.5)
Netting	0.0	0.0
Net Amount Recorded as a Derivative	$ (256.6)	$ (294.5)

XML

DERIVATIVE INSTRUMENTS - Narrative (Details) MMBTU in Millions, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) MW	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) MW	Sep. 30, 2020 USD ($)	Dec. 31, 2020 MMBTU MW
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts by United Illuminated Company			20.00%
Amount of power to be purchased under capacity-related contract (in MW) | MW	675		675		675
Amount of natural gas to be purchased under futures contracts | MMBTU					8.9
Gains (losses) on deferred as regulatory costs | $	$ 0.7	$ (2.6)	$ (9.5)	$ (20.6)
Level 3 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			5.50%
Level 3 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			9.80%
Level 3 | Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts			8.70%
CL&P
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts			80.00%

XML

DERIVATIVE INSTRUMENTS - Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used (Details) - CL&P - Level 3 - $ / KWmo	Sep. 30, 2021	Dec. 31, 2020
Capacity Prices
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	2.61
Capacity Prices | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input		4.30
Capacity Prices | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input		5.30
Capacity Prices | Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	2.61	4.63
Forward Reserve Prices | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.50	0.54
Forward Reserve Prices | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	1.15	0.90
Forward Reserve Prices | Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.82	0.72

XML

DERIVATIVE INSTRUMENTS - Changes in the Level 3 Category of Derivative Assets Measured at Fair Value on a Recurring Basis (Details) - CL&P - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivatives, Net [Rollforward]
Fair Value as of Beginning of Period	$ (279.7)	$ (322.0)	$ (293.1)	$ (329.2)
Net Realized/Unrealized Gains/(Losses) Included in Regulatory Assets	0.7	(4.7)	(10.9)	(22.3)
Settlements	13.7	14.9	38.7	39.7
Fair Value as of End of Period	$ (265.3)	$ (311.8)	$ (265.3)	$ (311.8)

XML

MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 39.2		$ 39.2		$ 40.9
Unrealized gain (loss) recorded in other income	(0.5)	$ 1.6	2.5	$ (1.0)
CYAPC and YAEC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	214.9		214.9		205.1
Marketable securities held in nuclear decommissioning trust	$ 195.2		$ 195.2		$ 192.5

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MARKETABLE SECURITIES - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Amortized Cost	$ 217.5	$ 213.1
Pre-Tax Unrealized Gains	8.0	11.2
Pre-Tax Unrealized Losses	(0.2)	(0.1)
Fair Value	$ 225.3	$ 224.2

XML

MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Less than one year	$ 30.9
One to five years	65.5
Six to ten years	41.8
Greater than ten years	79.3
Amortized Cost	217.5	$ 213.1
Fair Value
Less than one year	30.9
One to five years	67.1
Six to ten years	43.9
Greater than ten years	83.4
Fair Value	$ 225.3	$ 224.2

XML

MARKETABLE SECURITIES - Marketable Securities Recorded at Fair Value on a Recurring Basis by Level (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 479.4	$ 470.2
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	283.8	287.2
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	195.6	183.0
Mutual Funds and Equities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	254.1	246.0
Money Market Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	29.7	41.2
U.S. Government Issued Debt Securities (Agency and Treasury) | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	98.9	72.9
Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	63.4	63.8
Asset-Backed Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	13.4	11.9
Municipal Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	6.1	24.0
Other Fixed Income Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 13.8	$ 10.4

XML

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 10, 2021	Mar. 31, 2021	Dec. 31, 2020
NSTAR Electric
Line of Credit Facility [Line Items]
Long-term Line of Credit, Noncurrent	$ 80,000,000
Notes payable to Eversource parent	24,600,000			$ 21,300,000
Amount of long-term debt requested for issuance			$ 1,600,000,000
PSNH
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	66,500,000			46,300,000
Massachusetts Department of Public Utilities
Line of Credit Facility [Line Items]
Amount of long-term debt requested for issuance		$ 725,000,000
Line of Credit | CL&P
Line of Credit Facility [Line Items]
Maximum borrowing capacity	450,000,000
Amount outstanding under line of credit	0
Line of Credit | PSNH
Line of Credit Facility [Line Items]
Maximum borrowing capacity	300,000,000
Amount outstanding under line of credit	0
Commercial Paper | NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Line of Credit
Line of Credit Facility [Line Items]
Amount outstanding under line of credit	0			$ 0
Line of Credit | NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Eversource Parent | Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,000,000,000
Eversource Parent | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000,000,000
Debt instrument term	5 years
NSTAR Electric | Line of Credit | NSTAR Electric
Line of Credit Facility [Line Items]
Debt instrument term	5 years

XML

SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - Commercial Paper - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Borrowings outstanding	$ 653.0	$ 1,054.3
Available borrowing capacity	$ 1,347.0	$ 945.7
Weighted-average interest rate	0.18%	0.25%
NSTAR Electric
Debt Instrument [Line Items]
Borrowings outstanding	$ 138.0	$ 195.0
Available borrowing capacity	$ 512.0	$ 455.0
Weighted-average interest rate	0.10%	0.16%

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SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Thousands		1 Months Ended								9 Months Ended
	Aug. 10, 2021	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Repayments										$ (1,142,500)	$ (302,236)
Senior Notes | Eversource Parent 2.50% Series I Senior Notes | Eversource Parent
Debt Instrument [Line Items]
Interest rate, stated percentage									2.50%
Repayments									$ (450,000)
Senior Notes | Eversource Parent 2.55% Series S Senior Notes | Eversource Parent
Debt Instrument [Line Items]
Interest rate, stated percentage								2.55%
Issuances								$ 350,000
Senior Notes | Eversource Parent 1.40% Series U Senior Notes | Eversource Parent
Debt Instrument [Line Items]
Interest rate, stated percentage				1.40%
Issuances				$ 300,000
Senior Notes | Eversource Parent Variable Rate Series T Senior Notes | Eversource Parent
Debt Instrument [Line Items]
Issuances	$ 350,000			$ 350,000
Senior Notes | Eversource Parent Variable Rate Series T Senior Notes | Eversource Parent | Compounded SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	0.25%
CL&P
Debt Instrument [Line Items]
Repayments										$ (120,500)	0
CL&P | Senior Notes | 2.05% Series A First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage					2.05%
Issuances					$ 425,000
CL&P | Senior Notes | 4.38% Series A PCRB
Debt Instrument [Line Items]
Interest rate, stated percentage			4.38%							4.38%
Repayments			$ (120,500)
NSTAR Electric
Debt Instrument [Line Items]
Repayments										$ (250,000)	(95,000)
NSTAR Electric | Senior Notes | 3.10% 2021 Debentures
Debt Instrument [Line Items]
Interest rate, stated percentage						3.10%
Issuances						$ 300,000
NSTAR Electric | Senior Notes | 3.50% Series F Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage					3.50%
Repayments					$ (250,000)
NSTAR Electric | Senior Notes | 1.95% 2021 Debentures
Debt Instrument [Line Items]
Interest rate, stated percentage				1.95%
Issuances				$ 300,000
PSNH
Debt Instrument [Line Items]
Repayments										(282,000)	$ 0
PSNH | Senior Notes | 4.05% Series Q First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage								4.05%
Repayments								$ (122,000)
PSNH | Senior Notes | 3.20% Series R First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage					3.20%
Repayments					$ (160,000)
PSNH | Senior Notes | 2.20% Series V First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage					2.20%
Issuances					$ 350,000
Aquarion | Senior Notes | Aquarion Water Company of Connecticut 3.31% Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage							3.31%
Issuances							$ 100,000
Aquarion | Senior Notes | Aquarion Water Company of Connecticut 5.50% Notes
Debt Instrument [Line Items]
Interest rate, stated percentage							5.50%
Repayments							$ (40,000)
EGMA | Senior Notes
Debt Instrument [Line Items]
Debt instrument, refinanced amount			$ 309,400							$ 309,400
EGMA | Senior Notes | EGMA 2.11% Series A First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage			2.11%							2.11%
Issuances			$ 310,000
EGMA | Senior Notes | EGMA 2.92% Series B First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage			2.92%							2.92%
Issuances			$ 240,000
Yankee Gas | Senior Notes | Yankee Gas 1.38% Series S First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage				1.38%
Issuances				$ 90,000
Yankee Gas | Senior Notes | Yankee Gas 2.88% Series T First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage				2.88%
Issuances				$ 35,000
NSTAR Gas Company | Senior Notes | NSTAR Gas 2.25% Series T First Mortgage Bonds | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage		2.25%
Issuances		$ 40,000
NSTAR Gas Company | Senior Notes | NSTAR Gas 3.03% Series U First Mortgage Bonds | Subsequent Event
Debt Instrument [Line Items]
Interest rate, stated percentage		3.03%
Issuances		$ 40,000

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RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Narrative (Details) - PSNH - Rate Reduction Bonds	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Amount of securitized rate reduction bonds issued	$ 635,700,000
Weighted average interest rate	3.66%

XML

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	$ 6,475,200	$ 6,569,900
Regulatory Liabilities	3,907,582	3,850,781
Accrued Interest (included in Other Current Liabilities)	802,831	809,214
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	453,702	496,912
Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	489,700	522,100
Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	146,900	161,000
Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	55,500	73,600
Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	44,700	43,600
PSNH
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	927,700	989,100
Regulatory Liabilities	389,426	383,183
Accrued Interest (included in Other Current Liabilities)	61,883	58,487
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	453,702	496,912
PSNH | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Rate Reduction Bonds - Current Portion	43,200	43,200
Rate Reduction Bonds - Long-Term Portion	453,700	496,900
PSNH | Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	489,700	522,100
PSNH | Securitized Stranded Costs | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	489,700	522,100
PSNH | Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	16,900	20,900
PSNH | Other Regulatory Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Regulatory Liabilities	8,000	9,100
Accrued Interest (included in Other Current Liabilities)	3,000	8,000
PSNH | Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,600	36,800
PSNH | Current Derivative Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,300	36,800
PSNH | Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	3,200	2,100
PSNH | Other Long-Term Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	$ 3,200	$ 2,100

XML

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Condensed Income Statements, Captions [Line Items]
Interest Expense on RRB Principal (included in Interest Expense)	$ 147,962	$ 134,066	$ 431,162	$ 403,067
PSNH
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	(17,922)	(7,360)	(62,744)	(39,034)
Interest Expense on RRB Principal (included in Interest Expense)	14,321	14,942	42,774	44,029
PSNH | VIE | Rate Reduction Bonds
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	10,800	10,800	32,400	32,400
Interest Expense on RRB Principal (included in Interest Expense)	$ 4,500	$ 4,900	$ 13,900	$ 14,900

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION - Components of Net Periodic Benefit Expense/(Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 21.5	$ 18.7	$ 64.3	$ 57.0
Interest Cost	32.5	44.4	97.5	133.0
Expected Return on Plan Assets	(109.5)	(99.2)	(328.0)	(298.8)
Actuarial Loss	60.7	50.7	183.1	150.7
Prior Service Cost/(Credit)	0.3	0.2	1.1	0.8
Total Net Periodic Benefit Plan Expense/(Income)	5.5	14.8	18.0	42.7
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3.3	2.4	10.1	7.3
Interest Cost	4.3	6.1	12.9	18.3
Expected Return on Plan Assets	(19.8)	(18.3)	(59.3)	(55.1)
Actuarial Loss	2.0	2.2	5.9	6.3
Prior Service Cost/(Credit)	(5.3)	(5.3)	(15.9)	(15.9)
Total Net Periodic Benefit Plan Expense/(Income)	(15.5)	(12.9)	(46.3)	(39.1)
CL&P | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	5.6	5.4	17.4	16.5
Interest Cost	6.7	9.3	20.7	28.1
Expected Return on Plan Assets	(21.7)	(19.8)	(65.0)	(59.6)
Actuarial Loss	10.8	9.7	34.6	29.4
Prior Service Cost/(Credit)	0.0	0.0	0.0	0.0
Total Net Periodic Benefit Plan Expense/(Income)	1.4	4.6	7.7	14.4
Intercompany Expense/(Income) Allocations	2.2	2.4	5.8	6.7
CL&P | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.5	0.4	1.7	1.3
Interest Cost	0.8	1.1	2.4	3.3
Expected Return on Plan Assets	(2.5)	(2.5)	(7.7)	(7.4)
Actuarial Loss	0.4	0.3	1.2	0.9
Prior Service Cost/(Credit)	0.3	0.3	0.8	0.8
Total Net Periodic Benefit Plan Expense/(Income)	(0.5)	(0.4)	(1.6)	(1.1)
Intercompany Expense/(Income) Allocations	(0.4)	(0.3)	(1.3)	(0.9)
NSTAR Electric | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	4.0	3.8	11.9	11.4
Interest Cost	6.7	9.7	20.1	29.0
Expected Return on Plan Assets	(27.1)	(25.7)	(81.1)	(77.2)
Actuarial Loss	15.3	14.0	46.1	41.3
Prior Service Cost/(Credit)	0.1	0.0	0.3	0.2
Total Net Periodic Benefit Plan Expense/(Income)	(1.0)	1.8	(2.7)	4.7
Intercompany Expense/(Income) Allocations	2.4	2.3	6.4	6.5
NSTAR Electric | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.6	0.5	1.8	1.6
Interest Cost	1.1	1.7	3.3	5.0
Expected Return on Plan Assets	(9.2)	(8.5)	(27.7)	(25.5)
Actuarial Loss	0.5	0.6	1.6	1.8
Prior Service Cost/(Credit)	(4.3)	(4.2)	(12.7)	(12.7)
Total Net Periodic Benefit Plan Expense/(Income)	(11.3)	(9.9)	(33.7)	(29.8)
Intercompany Expense/(Income) Allocations	(0.5)	(0.4)	(1.5)	(1.0)
PSNH | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	2.2	2.0	6.6	6.2
Interest Cost	3.7	4.8	10.9	14.5
Expected Return on Plan Assets	(11.9)	(11.1)	(35.6)	(33.5)
Actuarial Loss	5.3	3.8	15.4	11.8
Prior Service Cost/(Credit)	0.0	0.0	0.0	0.0
Total Net Periodic Benefit Plan Expense/(Income)	(0.7)	(0.5)	(2.7)	(1.0)
Intercompany Expense/(Income) Allocations	0.7	0.8	1.9	2.2
PSNH | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.2	0.9	0.6
Interest Cost	0.4	0.7	1.3	2.1
Expected Return on Plan Assets	(1.6)	(1.4)	(4.6)	(4.2)
Actuarial Loss	0.1	0.2	0.4	0.6
Prior Service Cost/(Credit)	0.1	0.1	0.3	0.3
Total Net Periodic Benefit Plan Expense/(Income)	(0.7)	(0.2)	(1.7)	(0.6)
Intercompany Expense/(Income) Allocations	$ (0.2)	$ (0.1)	$ (0.5)	$ (0.4)

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PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION - Narrative (Details) $ in Millions	Sep. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Expected pension plan contributions	$ 180
CL&P
Defined Benefit Plan Disclosure [Line Items]
Expected pension plan contributions	99
NSTAR Electric
Defined Benefit Plan Disclosure [Line Items]
Expected pension plan contributions	$ 30

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COMMITMENTS AND CONTINGENCIES - Environmental Sites and Related Reserves (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) site	Dec. 31, 2020 USD ($) site
Site Contingency [Line Items]
Number of Sites | site	62	63
Reserve | $	$ 111.9	$ 102.4
CL&P
Site Contingency [Line Items]
Number of Sites | site	14	15
Reserve | $	$ 12.5	$ 12.3
NSTAR Electric
Site Contingency [Line Items]
Number of Sites | site	12	12
Reserve | $	$ 3.7	$ 4.7
PSNH
Site Contingency [Line Items]
Number of Sites | site	9	9
Reserve | $	$ 6.4	$ 7.1

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COMMITMENTS AND CONTINGENCIES - Environmental Matters (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Site Contingency [Line Items]
Reserve balance	$ 111.9	$ 102.4
MGP Sites
Site Contingency [Line Items]
Reserve balance	$ 102.4	$ 92.2

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COMMITMENTS AND CONTINGENCIES - Non-Cancellable Commitments under Purchase Commitment Contracts (Details) - Renewable Energy - NSTAR Electric $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2021	$ 27.1
2022	103.9
2023	230.5
2024	341.2
2025	348.1
Thereafter	6,564.2
Total	7,615.0
Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Total	$ 6,700.0
Contract term	20 years
Minimum | Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated costs	$ 150.0
Maximum | Massachusetts Clean Energy 83D Contract
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated costs	$ 415.0

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COMMITMENTS AND CONTINGENCIES - Guarantees and Obligations Narrative (Details) - USD ($)	Sep. 30, 2021	Sep. 16, 2020
Loss Contingencies [Line Items]
Fair value of guarantees	$ 5,700,000
Letter of Credit | Eversource Investment LLC
Loss Contingencies [Line Items]
Maximum borrowing capacity		$ 25,000,000

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COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions	Sep. 30, 2021 USD ($)
North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest	50.00%
Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 15.4
Ownership interest	50.00%
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Ownership interest	50.00%
Eversource Investment LLC | North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest	50.00%
Construction-related purchase agreements with third-party contractors | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,093.5
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	386.4
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	40.6
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	0.0
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	910.0
OREC capacity production | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	2.2
Transmission interconnection | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	1.2
Real estate purchase | Bay State Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	2.5
Surety bonds | Various
Guarantor Obligations [Line Items]
Maximum exposure (up to)	67.5
Lease payments for real estate | Rocky River Realty Company and Eversource Service
Guarantor Obligations [Line Items]
Maximum exposure (up to)	4.0
Performance guarantee | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,300.0
Percent of obligations guaranteed	50.00%
Performance guarantee | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 14.8
Payment guarantee | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 62.5
Percent of obligations guaranteed	50.00%
Payment guarantee | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 25.8
Construction-Related Purchase Guarantee | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 420.6

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COMMITMENTS AND CONTINGENCIES - FERC ROE Complaints (Details) - USD ($) $ in Millions			9 Months Ended	36 Months Ended
	Apr. 29, 2016	Oct. 16, 2014	Sep. 30, 2021	Oct. 15, 2014	Dec. 31, 2020
Loss Contingencies [Line Items]
Percentage of base ROE reasonably justified			10.41%
Percentage of incentive cap on total ROE			13.08%
FERC ROE First, Second and Third Complaints
Loss Contingencies [Line Items]
Base ROE subsequently authorized			11.14%
FERC ROE First, Second and Third Complaints | Minimum
Loss Contingencies [Line Items]
Percentage of maximum ROE for any incentive project				11.14%
FERC ROE First, Second and Third Complaints | Maximum
Loss Contingencies [Line Items]
Percentage of maximum ROE for any incentive project				13.10%
FERC ROE Complaints
Loss Contingencies [Line Items]
Period of complaint			15 months
Basis point change			0.10%
Estimate of possible loss for each 10 basis point change to base ROE			$ 3.0
FERC ROE Fourth Complaint
Loss Contingencies [Line Items]
Base ROE percentage of complaint period	10.57%
Maximum percentage cap of ROE for incentive projects	11.74%
FERC ROE First Complaint
Loss Contingencies [Line Items]
Base ROE subsequently authorized		10.57%
Percentage of maximum ROE for any incentive project		11.74%
Amounts associated with first complaint refunded			38.9
FERC ROE First Complaint | CL&P
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			22.4
FERC ROE First Complaint | NSTAR Electric
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			13.7
FERC ROE First Complaint | PSNH
Loss Contingencies [Line Items]
Amounts associated with first complaint refunded			$ 2.8
FERC ROE Second Complaint
Loss Contingencies [Line Items]
Base ROE percentage of complaint period			10.57%
Percentage of maximum ROE for any incentive project			11.74%
Loss contingency, estimate of possible earnings impact			$ 39.1		$ 39.1
FERC ROE Second Complaint | CL&P
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			21.4		21.4
FERC ROE Second Complaint | NSTAR Electric
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			14.6		14.6
FERC ROE Second Complaint | PSNH
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact			$ 3.1		$ 3.1

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COMMITMENTS AND CONTINGENCIES - Eversource and NSTAR Electric Boston Harbor Civil Action (Details)	Jul. 15, 2016 kV
Commitments and Contingencies Disclosure [Abstract]
Amount of capacity required for installation of distribution cable (in kV)	115

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COMMITMENTS AND CONTINGENCIES - CL&P Tropical Storm Isaias Response Investigation (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2021	Jul. 14, 2021	May 07, 2021	May 06, 2021	Apr. 28, 2021
Loss Contingencies [Line Items]
Loss contingency, allowed rate of ROE					9.25%
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Loss contingency, estimate of possible earnings impact				$ 30.0
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards				28.4
Loss contingency, estimate of possible earnings impact, accident reporting violation fines				$ 1.6
Non-compliance fine		$ 28.6
Loss contingency, accident reporting violation fines		$ 0.2
Loss contingency, penalty rate as a percent of distribution revenues			2.50%
Loss contingency, after-tax earnings impact per share (in dollars per share)	$ (0.25)	$ 0.07

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COMMITMENTS AND CONTINGENCIES - CL&P Comprehensive Settlement Agreement (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Oct. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Jul. 14, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Regulatory Liabilities		$ 612,931			$ 389,430
Loss related to litigation settlement		103,583	$ 0
CL&P
Loss Contingencies [Line Items]
Regulatory Liabilities		311,269			$ 137,166
Loss related to litigation settlement		103,583	$ 0
Subsequent Event
Loss Contingencies [Line Items]
Basis points reduction to return on equity, scenario one	0.90%
Basis points reduction to return on equity, scenario two	0.45%
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Loss related to litigation settlement		103,600
Loss related to litigation settlement, net of tax		$ 85,800
Loss contingency, after-tax earnings impact per share (in dollars per share)		$ 0.25		$ (0.07)
Unfavorable Regulatory Action | Sales
Loss Contingencies [Line Items]
Loss related to litigation settlement		$ 65,000
Unfavorable Regulatory Action | Oil and Gas, Operation and Maintenance
Loss Contingencies [Line Items]
Loss related to litigation settlement		10,000
Unfavorable Regulatory Action | CL&P
Loss Contingencies [Line Items]
Regulatory Liabilities		$ 75,000
Unfavorable Regulatory Action | Subsequent Event
Loss Contingencies [Line Items]
Customer credits	$ 65,000
Customer assistance initiatives	10,000
Customer credits and assistance	$ 75,000

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	$ 155,570	$ 155,570
Rate Reduction Bonds	453,702	496,912
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	155,600	155,600
Long-Term Debt	18,219,200	16,179,100
Rate Reduction Bonds	496,900	540,100
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	165,500	169,100
Long-Term Debt	19,810,900	18,420,100
Rate Reduction Bonds	555,800	603,400
CL&P
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
CL&P | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	116,200	116,200
Long-Term Debt	4,215,100	3,914,800
Rate Reduction Bonds	0	0
CL&P | Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	121,400	123,400
Long-Term Debt	4,865,200	4,800,900
Rate Reduction Bonds	0	0
NSTAR Electric
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
NSTAR Electric | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Long-Term Debt	3,984,700	3,643,200
Rate Reduction Bonds	0	0
NSTAR Electric | Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	44,100	45,700
Long-Term Debt	4,494,300	4,294,000
Rate Reduction Bonds	0	0
PSNH
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate Reduction Bonds	453,702	496,912
PSNH | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	1,163,600	1,099,100
Rate Reduction Bonds	496,900	540,100
PSNH | Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	0	0
Long-Term Debt	1,228,900	1,207,000
Rate Reduction Bonds	$ 555,800	$ 603,400

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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications							$ (3,000)	$ (1,300)
Amounts Reclassified from AOCI							7,500	6,000
Net OCI	$ 2,477	$ 881	$ 1,188	$ 2,161	$ 553	$ 1,948	4,546	4,662
Total
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(76,400)			(65,100)	(76,400)	(65,100)
Net OCI	2,477	$ 881	1,188	2,161	$ 553	1,948
Ending balance	(71,900)			(60,400)			(71,900)	(60,400)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Beginning balance			(1,400)			(3,000)	(1,400)	(3,000)
OCI Before Reclassifications							0	0
Amounts Reclassified from AOCI							1,000	1,200
Net OCI							1,000	1,200
Ending balance	(400)			(1,800)			(400)	(1,800)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance			1,100			700	1,100	700
OCI Before Reclassifications							(600)	300
Amounts Reclassified from AOCI							0	0
Net OCI							(600)	300
Ending balance	500			1,000			500	1,000
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Beginning balance			$ (76,100)			$ (62,800)	(76,100)	(62,800)
OCI Before Reclassifications							(2,400)	(1,600)
Amounts Reclassified from AOCI							6,500	4,800
Net OCI							4,100	3,200
Ending balance	$ (72,000)			$ (59,600)			$ (72,000)	$ (59,600)

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COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020
Class of Stock [Line Items]
Par value (in dollars per share)	$ 5		$ 5	$ 5
Authorized (in shares)	380,000,000	380,000,000
Issued (in shares)	357,818,402	357,818,402
CL&P
Class of Stock [Line Items]
Par value (in dollars per share)	$ 10
Authorized (in shares)	24,500,000	24,500,000
Issued (in shares)	6,035,205	6,035,205
NSTAR Electric
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1
Authorized (in shares)	100,000,000	100,000,000
Issued (in shares)	200	200
PSNH
Class of Stock [Line Items]
Par value (in dollars per share)	$ 1
Authorized (in shares)	100,000,000	100,000,000
Issued (in shares)	301	301

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COMMON SHARES - Narrative (Details) - shares	Sep. 30, 2021	Dec. 31, 2020
Equity [Abstract]
Treasury stock (in shares)	14,044,078	14,864,379
Common stock outstanding (in shares)	343,774,324	342,954,023

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COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Equity [Abstract]
Dividends on preferred stock	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 5,600	$ 5,600
Noncontrolling interest attributed to preferred stock of subsidiaries	$ 155,570						$ 155,570		$ 155,570

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EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive share awards excluded from the EPS computation (in shares)	0	0	52,747

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EARNINGS PER SHARE - Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income Attributable to Common Shareholders	$ 283,166	$ 346,260	$ 913,829	$ 933,244
Net Income Attributable to Common Shareholders	$ 283,200	$ 346,300	$ 913,800	$ 933,200
Weighted Average Common Shares Outstanding:
Basic (in shares)	344,023,846	343,076,614	343,848,905	337,375,172
Dilutive Effect of:
Share-Based Compensation Awards and Other (in shares)	645,936	696,988	631,151	686,403
Equity Forward Sale Agreement (in shares)	0	0	0	362,525
Total Dilutive Effect (in shares)	645,936	696,988	631,151	1,048,928
Diluted (in shares)	344,669,782	343,773,602	344,480,056	338,424,100
Basic EPS (in dollars per share)	$ 0.82	$ 1.01	$ 2.66	$ 2.77
Diluted EPS (in dollars per share)	$ 0.82	$ 1.01	$ 2.65	$ 2.76

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REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 06, 2021
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,444,600	$ 2,352,100	$ 7,355,600	$ 6,593,800
Alternative Revenue Programs	(13,500)	(9,600)	21,300	69,800
Other Revenues	1,700	1,100	4,300	6,900
Operating Revenues	$ 2,432,794	$ 2,343,642	7,381,172	6,670,497
Loss related to litigation settlement			103,583	0
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 1,100	$ 1,100	3,800	3,200
Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Loss related to litigation settlement			103,600
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards					$ 28,400
Sales | Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Loss related to litigation settlement			65,000
CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 919,643	$ 994,270	2,736,513	2,711,394
Loss related to litigation settlement			103,583	0
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 200	$ 200	600	600
NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 918,698	$ 875,371	2,343,116	2,270,174
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Lease revenue	$ 700	$ 700	2,500	2,100
PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	$ 314,893	$ 283,669	887,177	815,261
Operating Lease, Income, Comprehensive Income [Extensible Enumeration]	Operating Revenues	Operating Revenues
Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 1,267,600	$ 1,275,200	3,920,500	3,576,500
Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	823,600	739,500	2,302,200	2,103,200
Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	121,100	106,200	371,100	308,900
Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,212,300	2,120,900	6,593,800	5,988,600
Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	141,700	111,600	325,500	252,100
Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	147,100	89,400	437,200	265,900
Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	37,800	30,200	94,700	87,200
(Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(94,300)		(95,600)
Operating Segments | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,143,600	1,192,800	3,204,400	3,109,100
Alternative Revenue Programs	(82,000)	(65,000)	(74,200)	(27,800)
Other Revenues	200	200	300	2,000
Operating Segments | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,055,700	980,000	2,713,900	2,563,800
Alternative Revenue Programs	(14,400)	8,200	(11,300)	31,100
Other Revenues	700	700	2,500	2,800
Operating Segments | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	394,200	347,600	1,047,500	940,500
Alternative Revenue Programs	(24,100)	(13,800)	(18,800)	(1,200)
Other Revenues	600	0	1,100	600
Operating Segments | Residential | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	572,000	608,700	1,558,600	1,567,900
Operating Segments | Residential | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	401,900	415,400	1,069,000	1,057,900
Operating Segments | Residential | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	172,900	159,800	467,300	437,900
Operating Segments | Commercial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	249,400	244,700	679,300	670,400
Operating Segments | Commercial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	411,300	358,300	975,700	921,300
Operating Segments | Commercial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	88,500	80,100	249,200	225,300
Operating Segments | Industrial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	35,000	38,000	100,200	105,300
Operating Segments | Industrial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	35,900	30,600	89,500	82,100
Operating Segments | Industrial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	25,300	22,400	71,400	61,000
Operating Segments | Total Retail Tariff Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	856,400	891,400	2,338,100	2,343,600
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	849,100	804,300	2,134,200	2,061,300
Operating Segments | Total Retail Tariff Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	286,700	262,300	787,900	724,200
Operating Segments | Wholesale Transmission Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	268,200	233,300	652,800	576,500
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	171,000	153,100	478,200	430,300
Operating Segments | Wholesale Transmission Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	88,000	71,800	207,400	171,100
Operating Segments | Wholesale Market Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	100,300	60,000	278,100	163,900
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	21,300	12,100	64,700	39,800
Operating Segments | Wholesale Market Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,200	7,500	37,300	27,400
Operating Segments | Other Revenues from Contracts with Customers | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,100	8,100	28,800	25,100
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	14,300	10,500	36,800	32,400
Operating Segments | Other Revenues from Contracts with Customers | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	7,300	3,700	14,900	10,900
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(93,400)	0	(93,400)	0
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	2,300	0	6,900
Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	326,100	322,300	999,100	900,700
Alternative Revenue Programs	0	0	0	0
Other Revenues	0	0	0	0
Operating Revenues	326,100	322,300	999,100	900,700
Other | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	23,000	19,000	62,500	55,600
Other | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Other | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	303,100	303,300	936,600	845,100
Other | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(716,100)	(669,600)	(2,021,900)	(1,833,200)
Alternative Revenue Programs	102,000	67,000	103,000	48,900
Other Revenues	0	0	0	0
Operating Revenues	(614,100)	(602,600)	(1,918,900)	(1,784,300)
Eliminations | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(1,400)	(1,400)	(4,100)	(3,700)
Eliminations | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(4,800)	(3,600)	(12,800)	(10,100)
Eliminations | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(6,200)	(5,000)	(16,900)	(13,800)
Eliminations | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(408,500)	(365,600)	(1,075,400)	(981,400)
Eliminations | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Eliminations | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(301,400)	(299,000)	(929,600)	(838,000)
Eliminations | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Eliminations | CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	(142,200)	(133,700)	(394,000)	(371,900)
Eliminations | NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	(123,300)	(113,500)	(362,000)	(327,500)
Eliminations | PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	(55,800)	(50,100)	(142,600)	(124,600)
Electric Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,061,800	2,057,900	5,614,000	5,422,200
Alternative Revenue Programs	(7,900)	1,700	14,900	54,800
Other Revenues	1,300	700	3,200	4,900
Operating Revenues	2,055,200	2,060,300	5,632,100	5,481,900
Electric Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,146,800	1,183,900	3,094,900	3,063,700
Electric Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	748,800	682,700	1,902,900	1,815,700
Electric Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	96,200	91,000	261,100	248,400
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,991,800	1,957,600	5,258,900	5,127,800
Electric Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	133,800	79,600	380,100	231,100
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	29,600	20,700	68,400	63,300
Electric Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(93,400)		(93,400)
Natural Gas Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	182,700	114,100	1,256,400	746,100
Alternative Revenue Programs	2,700	(4,000)	21,300	22,900
Other Revenues	100	100	100	1,000
Operating Revenues	185,500	110,200	1,277,800	770,000
Natural Gas Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	81,700	45,500	722,800	399,600
Natural Gas Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	59,000	41,100	356,400	243,500
Natural Gas Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	28,600	17,500	119,500	67,000
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	169,300	104,100	1,198,700	710,100
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,200	8,700	54,100	31,900
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,200	1,300	3,600	4,100
Natural Gas Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Electric Transmission | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	530,700	461,400	1,348,600	1,187,800
Alternative Revenue Programs	(112,600)	(72,300)	(119,200)	(52,700)
Other Revenues	200	200	700	500
Operating Revenues	418,300	389,300	1,230,100	1,135,600
Electric Transmission | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	527,200	458,200	1,338,400	1,177,900
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Electric Transmission | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,500	3,200	10,200	9,900
Electric Transmission | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0		0
Water Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	59,400	66,000	159,400	170,200
Alternative Revenue Programs	2,300	(2,000)	1,300	(4,100)
Other Revenues	100	100	300	500
Operating Revenues	61,800	64,100	161,000	166,600
Water Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	39,100	45,800	102,800	113,200
Water Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	17,200	17,100	47,000	47,700
Water Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,300	3,300	3,600
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	57,400	64,200	153,100	164,500
Water Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Water Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,100	3,000	2,900
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,800	$ 700	5,500	$ 2,800
Water Distribution | Operating Segments | (Reserve for)/Amortization of Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ (900)		$ (2,200)

XML

SEGMENT INFORMATION - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) segment
CL&P
Segment Reporting Information [Line Items]
Number of reportable segments	1
NSTAR Electric
Segment Reporting Information [Line Items]
Number of reportable segments	1
PSNH
Segment Reporting Information [Line Items]
Number of reportable segments	1
Affiliated Entity
Segment Reporting Information [Line Items]
Amount of natural gas transmission purchased | $	$ 77.7

XML

SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,432,794	$ 2,343,642	$ 7,381,172	$ 6,670,497
Depreciation and Amortization	(322,100)	(302,000)	(981,100)	(851,900)
Other Operating Expenses	(1,627,400)	(1,480,400)	(4,879,600)	(4,284,600)
Operating Income/(Loss)	483,331	561,230	1,520,503	1,534,006
Interest Expense	(147,962)	(134,066)	(431,162)	(403,067)
Other Income, Net	43,768	29,218	124,588	83,565
Net Income/(Loss) Attributable to Common Shareholders	283,166	346,260	913,829	933,244
Cash Flows Used for Investments in Plant			2,211,136	2,101,564
Assets	48,014,055		48,014,055		$ 46,099,598
Other
Segment Reporting Information [Line Items]
Operating Revenues	326,100	322,300	999,100	900,700
Depreciation and Amortization	(28,000)	(24,100)	(83,700)	(68,100)
Other Operating Expenses	(275,200)	(271,500)	(860,300)	(771,400)
Operating Income/(Loss)	22,900	26,700	55,100	61,200
Interest Expense	(42,500)	(38,700)	(125,900)	(119,000)
Other Income, Net	325,900	401,000	1,059,200	1,087,900
Net Income/(Loss) Attributable to Common Shareholders	304,900	396,600	982,500	1,035,600
Cash Flows Used for Investments in Plant			157,600	181,200
Assets	21,624,500		21,624,500		22,089,400
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(614,100)	(602,600)	(1,918,900)	(1,784,300)
Depreciation and Amortization	1,100	300	3,100	1,200
Other Operating Expenses	613,700	603,100	1,918,900	1,787,900
Operating Income/(Loss)	700	800	3,100	4,800
Interest Expense	12,700	7,100	37,000	27,600
Other Income, Net	(320,400)	(397,000)	(1,046,200)	(1,076,100)
Net Income/(Loss) Attributable to Common Shareholders	(307,000)	(389,100)	(1,006,100)	(1,043,700)
Cash Flows Used for Investments in Plant			0	0
Assets	(20,648,600)		(20,648,600)		(21,492,400)
Electric Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	2,055,200	2,060,300	5,632,100	5,481,900
Depreciation and Amortization	(179,800)	(182,000)	(534,100)	(490,000)
Other Operating Expenses	(1,640,500)	(1,577,000)	(4,531,300)	(4,309,900)
Operating Income/(Loss)	234,900	301,300	566,700	682,000
Interest Expense	(61,000)	(53,300)	(175,400)	(160,700)
Other Income, Net	25,400	16,000	76,000	44,900
Net Income/(Loss) Attributable to Common Shareholders	150,400	205,500	365,400	450,600
Cash Flows Used for Investments in Plant			764,900	781,200
Assets	25,604,200		25,604,200		24,981,900
Natural Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	185,500	110,200	1,277,800	770,000
Depreciation and Amortization	(28,500)	(14,800)	(108,700)	(55,100)
Other Operating Expenses	(176,900)	(104,200)	(970,600)	(592,000)
Operating Income/(Loss)	(19,900)	(8,800)	198,500	122,900
Interest Expense	(15,700)	(10,100)	(44,200)	(32,100)
Other Income, Net	6,700	700	15,200	2,500
Net Income/(Loss) Attributable to Common Shareholders	(22,000)	(15,400)	129,600	73,300
Cash Flows Used for Investments in Plant			506,400	322,800
Assets	6,865,600		6,865,600		6,450,500
Electric Transmission | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	418,300	389,300	1,230,100	1,135,600
Depreciation and Amortization	(75,400)	(70,600)	(223,400)	(206,800)
Other Operating Expenses	(122,400)	(120,600)	(359,600)	(338,500)
Operating Income/(Loss)	220,500	198,100	647,100	590,300
Interest Expense	(33,500)	(31,100)	(98,700)	(93,800)
Other Income, Net	5,000	6,900	17,300	22,700
Net Income/(Loss) Attributable to Common Shareholders	139,400	125,600	412,400	381,800
Cash Flows Used for Investments in Plant			691,000	732,400
Assets	12,123,500		12,123,500		11,695,000
Water Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	61,800	64,100	161,000	166,600
Depreciation and Amortization	(11,500)	(10,800)	(34,300)	(33,100)
Other Operating Expenses	(26,100)	(10,200)	(76,700)	(60,700)
Operating Income/(Loss)	24,200	43,100	50,000	72,800
Interest Expense	(8,000)	(8,000)	(24,000)	(25,100)
Other Income, Net	1,200	1,600	3,100	1,700
Net Income/(Loss) Attributable to Common Shareholders	17,500	$ 23,100	30,000	35,600
Cash Flows Used for Investments in Plant			91,200	$ 84,000
Assets	$ 2,444,900		$ 2,444,900		$ 2,375,200

XML

ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS - Narrative (Details) - CMA $ in Millions	Oct. 09, 2020 USD ($)
Business Acquisition [Line Items]
Cash purchase price	$ 1,100.0
Target working capital amount	$ 68.6

XML

ACQUISITION OF ASSETS OF COLUMBIA GAS OF MASSACHUSETTS - Preliminary Allocation of the Cash Purchase Price (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Oct. 09, 2020
Business Acquisition [Line Items]
Goodwill	$ 4,453,618	$ 4,445,988
CMA
Business Acquisition [Line Items]
Current Assets			$ 138,000
Restricted Cash			57,000
PP&E			1,184,000
Goodwill			50,000
Other Noncurrent Assets, excluding Goodwill			131,000
Other Current Liabilities			(81,000)
Other Noncurrent Liabilities			(310,000)
Cash Purchase Price			$ 1,169,000

XML

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]
The Connecticut Light And Power Company [Member]
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]
NSTAR Electric Company [Member]
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]
Public Service Company Of New Hampshire (PSNH) [Member]
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]