Public Service Co Of New Hampshire 10-Q 7 Nov 23 2023 Q3 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Document And Entity [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
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)		349,326,209
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
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

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 78,813	$ 47,597
Cash Equivalents	0	327,006
Receivables, Net (net of allowance for uncollectible accounts)	1,430,183	1,517,138
Unbilled Revenues	171,934	238,968
Materials, Supplies, Natural Gas and REC Inventory	445,810	374,395
Regulatory Assets	1,507,888	1,335,491
Prepayments and Other Current Assets	374,471	382,603
Total Current Assets	4,009,099	4,223,198
Property, Plant and Equipment, Net	38,518,294	36,112,820
Deferred Debits and Other Assets:
Regulatory Assets	4,348,700	4,242,794
Goodwill	4,530,121	4,522,632
Investments in Unconsolidated Affiliates	2,723,931	2,176,080
Prepaid Pension and PBOP	1,238,512	1,045,524
Marketable Securities	327,381	366,508
Other Long-Term Assets	597,305	541,344
Total Deferred Debits and Other Assets	13,765,950	12,894,882
Total Assets	56,293,343	53,230,900
Current Liabilities:
Notes Payable	1,529,800	1,442,200
Long-Term Debt – Current Portion	2,071,862	1,320,129
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,642,181	2,113,905
Regulatory Liabilities	724,413	890,786
Other Current Liabilities	1,108,178	989,053
Total Current Liabilities	7,119,644	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,238,623	5,067,902
Regulatory Liabilities	4,021,830	3,930,305
Derivative Liabilities	85,322	143,929
Asset Retirement Obligations	504,671	502,713
Accrued Pension, SERP and PBOP	118,462	135,473
Other Long-Term Liabilities	908,731	888,081
Total Deferred Credits and Other Liabilities	10,877,639	10,668,403
Long-Term Debt	22,087,267	19,723,994
Rate Reduction Bonds	367,282	410,492
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Common Shares	1,799,920	1,799,920
Capital Surplus, Paid In	8,443,820	8,401,731
Retained Earnings	5,666,861	5,527,153
Accumulated Other Comprehensive Loss	(24,022)	(39,421)
Treasury Stock	(200,638)	(216,225)
Common Shareholders' Equity	15,685,941	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	$ 56,293,343	$ 53,230,900

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for uncollectible accounts	$ 542,746	$ 486,297

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Operating Revenues	$ 2,791,482	$ 3,215,645	$ 9,216,467	$ 9,259,596
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,168,599	1,388,041	4,232,912	3,718,278
Operations and Maintenance	500,711	454,289	1,382,563	1,378,897
Depreciation	329,528	302,143	962,477	885,711
Amortization	(143,979)	111,287	(438,460)	418,644
Energy Efficiency Programs	162,425	162,545	531,199	498,708
Taxes Other Than Income Taxes	243,645	240,047	704,989	683,441
Total Operating Expenses	2,260,929	2,658,352	7,375,680	7,583,679
Operating Income/(Loss)	530,553	557,293	1,840,787	1,675,917
Interest Expense	222,283	178,174	624,140	491,509
Impairment of Offshore Wind Investment	0	0	401,000	0
Other Income, Net	79,123	89,831	262,980	255,253
Income Before Income Tax Expense	387,393	468,950	1,078,627	1,439,661
Income Tax Expense	45,850	117,661	226,743	349,305
Net Income	341,543	351,289	851,884	1,090,356
Net Income Attributable to Noncontrolling Interests	1,880	1,880	5,639	5,639
Net Income Attributable to Common Shareholders	$ 339,663	$ 349,409	$ 846,245	$ 1,084,717
Basic EPS (in dollars per share)	$ 0.97	$ 1.01	$ 2.42	$ 3.13
Diluted EPS (in dollars per share)	$ 0.97	$ 1	$ 2.42	$ 3.13
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,704,155	347,297,411	349,461,219	346,115,823
Diluted (in shares)	349,851,969	347,762,693	349,731,320	346,573,101

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 341,543	$ 351,289	$ 851,884	$ 1,090,356
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	5	15	15
Changes in Unrealized (Losses)/Gains on Marketable Securities	0	(667)	1,254	(1,990)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	8,076	2,520	14,130	3,244
Other Comprehensive Income, Net of Tax	8,081	1,858	15,399	1,269
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)	(5,639)	(5,639)
Comprehensive Income Attributable to Common Shareholders	$ 347,744	$ 351,267	$ 861,644	$ 1,085,986

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance (in shares) at Dec. 31, 2021		344,403,196
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	$ 8,098,514	$ 5,005,391	$ (42,275)	$ (250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326
Dividends on Common Stock	(219,768)			(219,768)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(16,538)		(16,538)
Issuance of Treasury Shares (in shares)		447,076
Issuance of Treasury Shares	29,002		20,642			8,360
Other Comprehensive Income, Net of Tax	704				704
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Balance (in shares) at Dec. 31, 2021		344,403,196
Balance at Dec. 31, 2021	14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	(250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income, Net of Tax	1,269
Balance (in shares) at Sep. 30, 2022		347,348,749
Balance at Sep. 30, 2022	15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	(236,294)
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742
Dividends on Common Stock	(219,877)			(219,877)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		1,392,804
Issuance of Common Shares	128,106	$ 6,964	121,142
Long-Term Incentive Plan Activity	9,070		9,070
Issuance of Treasury Shares (in shares)		167,953
Issuance of Treasury Shares	14,481		11,340			3,141
Capital Stock Expense	(1,824)		(1,824)
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)
Balance (in shares) at Jun. 30, 2022		346,411,029
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	(239,377)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289
Dividends on Common Stock	(221,387)			(221,387)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		772,867
Issuance of Common Shares	71,799	$ 3,864	67,935
Long-Term Incentive Plan Activity	7,407		7,407
Issuance of Treasury Shares (in shares)		164,853
Issuance of Treasury Shares	13,845		10,762			3,083
Capital Stock Expense	(973)		(973)
Other Comprehensive Income, Net of Tax	1,858				1,858
Balance (in shares) at Sep. 30, 2022		347,348,749
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	(236,294)
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	(216,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039
Dividends on Common Stock	(235,354)			(235,354)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(13,141)		(13,141)
Issuance of Treasury Shares (in shares)		364,227
Issuance of Treasury Shares	30,319		23,495			6,824
Other Comprehensive Income, Net of Tax	3,230				3,230
Balance (in shares) at Mar. 31, 2023		348,808,082
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	(209,401)
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	(216,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income, Net of Tax	$ 15,399
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	(200,638)
Balance (in shares) at Mar. 31, 2023		348,808,082
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	(209,401)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302
Dividends on Common Stock	(235,491)			(235,491)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	5,155		5,155
Issuance of Treasury Shares (in shares)		213,854
Issuance of Treasury Shares	15,553		11,546			4,007
Other Comprehensive Income, Net of Tax	4,088				4,088
Balance (in shares) at Jun. 30, 2023		349,021,936
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	(205,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543
Dividends on Common Stock	(235,691)			(235,691)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	3,075		3,075
Issuance of Treasury Shares (in shares)		253,839
Issuance of Treasury Shares	16,715		11,959			4,756
Other Comprehensive Income, Net of Tax	$ 8,081				8,081
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ (200,638)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends on Common Shares (in dollars per share)	$ 0.675	$ 0.675	$ 0.675	$ 0.6375	$ 0.6375	$ 0.6375
Par value (in dollars per share)	$ 5			$ 5	$ 5

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities:
Net Income	$ 851,884	$ 1,090,356
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	962,477	885,711
Deferred Income Taxes	78,276	170,752
Uncollectible Expense	40,945	40,753
Pension, SERP and PBOP Income, Net	(64,311)	(120,416)
Pension Contributions	(5,000)	(80,000)
Regulatory Over/(Under) Recoveries, Net	(4,148)	(32,193)
Amortization	(438,460)	418,644
Cost of Removal Expenditures	(237,368)	(284,706)
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(72,041)
Payment in 2022 of Withheld Property Taxes	0	(78,446)
Impairment of Offshore Wind Investment	401,000	0
Other	(114,111)	(34,702)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	6,738	(294,383)
Taxes Receivable/Accrued, Net	177,618	160,260
Accounts Payable	(385,741)	11,821
Other Current Assets and Liabilities, Net	(100,646)	(92,506)
Net Cash Flows (Used In)/Provided by Operating Activities	1,169,153	1,688,904
Investing Activities:
Investments in Property, Plant and Equipment	(3,125,617)	(2,352,743)
Proceeds from Sales of Marketable Securities	341,871	340,660
Purchases of Marketable Securities	(287,814)	(313,714)
Investments in Unconsolidated Affiliates	(887,365)	(617,588)
Other Investing Activities	(57)	15,245
Net Cash Flows Used in Investing Activities	(3,958,982)	(2,928,140)
Financing Activities:
Issuance of Common Shares, Net of Issuance Costs	0	197,108
Cash Dividends on Common Shares	(688,878)	(643,634)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Increase/(Decrease) in Notes Payable	87,600	(1,103,950)
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
Issuance of Long-Term Debt	4,340,300	4,045,000
Retirement of Long-Term Debt	(1,203,000)	(775,000)
Other Financing Activities	(38,189)	(50,191)
Net Cash Flows Provided by Financing Activities	2,448,984	1,620,484
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(340,845)	381,248
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	$ 180,907	$ 602,256

THE CONNECTICUT LIGHT AND POWER

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 78,813	$ 47,597
Receivables, Net (net of allowance for uncollectible accounts)	1,430,183	1,517,138
Unbilled Revenues	171,934	238,968
Materials, Supplies, Natural Gas and REC Inventory	445,810	374,395
Regulatory Assets	1,507,888	1,335,491
Prepayments and Other Current Assets	374,471	382,603
Total Current Assets	4,009,099	4,223,198
Property, Plant and Equipment, Net	38,518,294	36,112,820
Deferred Debits and Other Assets:
Regulatory Assets	4,348,700	4,242,794
Prepaid Pension	1,238,512	1,045,524
Other Long-Term Assets	597,305	541,344
Total Deferred Debits and Other Assets	13,765,950	12,894,882
Total Assets	56,293,343	53,230,900
Current Liabilities:
Accounts Payable	1,642,181	2,113,905
Regulatory Liabilities	724,413	890,786
Other Current Liabilities	1,108,178	989,053
Total Current Liabilities	7,119,644	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,238,623	5,067,902
Regulatory Liabilities	4,021,830	3,930,305
Derivative Liabilities	85,322	143,929
Other Long-Term Liabilities	908,731	888,081
Total Deferred Credits and Other Liabilities	10,877,639	10,668,403
Long-Term Debt	22,087,267	19,723,994
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,443,820	8,401,731
Retained Earnings	5,666,861	5,527,153
Accumulated Other Comprehensive Income	(24,022)	(39,421)
Common Shareholders' Equity	15,685,941	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	56,293,343	53,230,900
The Connecticut Light and Power Company
Current Assets:
Cash	9,798	11,312
Unbilled Revenues	51,527	59,363
Materials, Supplies, Natural Gas and REC Inventory	145,774	88,157
Taxes Receivable	26	65,785
Regulatory Assets	383,672	314,089
Prepaid Property Taxes	79,848	25,281
Prepayments and Other Current Assets	36,216	37,243
Total Current Assets	1,390,690	1,259,721
Property, Plant and Equipment, Net	12,035,967	11,467,024
Deferred Debits and Other Assets:
Regulatory Assets	1,598,934	1,593,693
Prepaid Pension	180,485	147,914
Other Long-Term Assets	303,561	290,444
Total Deferred Debits and Other Assets	2,082,980	2,032,051
Total Assets	15,509,637	14,758,796
Current Liabilities:
Notes Payable to Eversource Parent	213,400	0
Obligations to Third Party Suppliers	79,211	40,704
Regulatory Liabilities	155,901	336,048
Derivative Liabilities	84,179	81,588
Other Current Liabilities	182,278	123,171
Total Current Liabilities	1,389,880	1,428,288
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,778,431	1,640,034
Regulatory Liabilities	1,308,284	1,263,396
Derivative Liabilities	85,322	143,929
Other Long-Term Liabilities	167,651	166,081
Total Deferred Credits and Other Liabilities	3,339,688	3,213,440
Long-Term Debt	4,606,833	4,216,488
Noncontrolling Interest – Preferred Stock of Subsidiaries	116,200	116,200
Common Shareholders' Equity:
Common Shares	60,352	60,352
Capital Surplus, Paid In	3,384,265	3,260,765
Retained Earnings	2,612,228	2,463,094
Accumulated Other Comprehensive Income	191	169
Common Shareholders' Equity	6,057,036	5,784,380
Commitments and Contingencies
Total Liabilities and Capitalization	15,509,637	14,758,796
The Connecticut Light and Power Company | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	629,064	612,052
Current Liabilities:
Accounts Payable	555,676	710,500
The Connecticut Light and Power Company | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	54,765	46,439
Current Liabilities:
Notes Payable to Eversource Parent	213,400
Accounts Payable	$ 119,235	$ 136,277

THE CONNECTICUT LIGHT AND POW_2

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 542,746	$ 486,297
The Connecticut Light and Power Company
Allowance for uncollectible accounts	$ 276,337	$ 225,320

THE CONNECTICUT LIGHT AND POW_3

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Revenues	$ 2,791,482	$ 3,215,645	$ 9,216,467	$ 9,259,596
Operating Expenses:
Purchased Power and Transmission	1,168,599	1,388,041	4,232,912	3,718,278
Operations and Maintenance	500,711	454,289	1,382,563	1,378,897
Depreciation	329,528	302,143	962,477	885,711
Energy Efficiency Programs	162,425	162,545	531,199	498,708
Taxes Other Than Income Taxes	243,645	240,047	704,989	683,441
Total Operating Expenses	2,260,929	2,658,352	7,375,680	7,583,679
Operating Income/(Loss)	530,553	557,293	1,840,787	1,675,917
Interest Expense	222,283	178,174	624,140	491,509
Other Income, Net	79,123	89,831	262,980	255,253
Income Before Income Tax Expense	387,393	468,950	1,078,627	1,439,661
Income Tax Expense	45,850	117,661	226,743	349,305
Net Income	341,543	351,289
The Connecticut Light and Power Company
Operating Revenues	1,190,096	1,369,101	3,563,150	3,690,614
Operating Expenses:
Purchased Power and Transmission	659,971	641,052	2,136,947	1,585,515
Operations and Maintenance	198,773	189,864	525,655	515,928
Depreciation	95,218	89,468	281,107	264,966
Amortization of Regulatory (Liabilities)/Assets, Net	(113,165)	105,825	(425,402)	318,347
Energy Efficiency Programs	39,903	37,934	100,687	103,111
Taxes Other Than Income Taxes	107,037	104,298	303,222	290,449
Total Operating Expenses	987,737	1,168,441	2,922,216	3,078,316
Operating Income/(Loss)	202,359	200,660	640,934	612,298
Interest Expense	52,439	42,391	145,410	125,152
Other Income, Net	18,311	21,927	46,610	61,290
Income Before Income Tax Expense	168,231	180,196	542,134	548,436
Income Tax Expense	48,843	36,909	141,030	126,334
Net Income	$ 119,388	$ 143,287	$ 401,104	$ 422,102

THE CONNECTICUT LIGHT AND POW_4

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Income	$ 341,543	$ 351,289
Other Comprehensive (Loss)/Income, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	347,744	351,267	$ 861,644	$ 1,085,986
The Connecticut Light and Power Company
Net Income	119,388	143,287	401,104	422,102
Other Comprehensive (Loss)/Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(7)	(21)	(20)
Changes in Unrealized (Losses)/Gains on Marketable Securities	0	(23)	43	(68)
Other Comprehensive (Loss)/Income, Net of Tax	(7)	(30)	22	(88)
Comprehensive Income Attributable to Common Shareholders	$ 119,381	$ 143,257	$ 401,126	$ 422,014

THE CONNECTICUT LIGHT AND POW_5

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	The Connecticut Light and Power Company	The Connecticut Light and Power Company Common Stock	The Connecticut Light and Power Company Capital Surplus, Paid In	The Connecticut Light and Power Company Retained Earnings	The Connecticut Light and Power Company Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2021		344,403,196					6,035,205
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	$ 8,098,514	$ 5,005,391	$ (42,275)	$ 5,299,501	$ 60,352	$ 3,010,765	$ 2,228,133	$ 251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		152,977			152,977
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(219,768)			(219,768)		(73,100)			(73,100)
Capital Contributions from Eversource Parent						100,000		100,000
Other comprehensive income (loss)						(35)				(35)
Balance (in shares) at Mar. 31, 2022		344,850,272					6,035,205
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	5,477,953	$ 60,352	3,110,765	2,306,620	216
Balance (in shares) at Dec. 31, 2021		344,403,196					6,035,205
Balance at Dec. 31, 2021	14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	5,299,501	$ 60,352	3,010,765	2,228,133	251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						422,102
Other comprehensive income (loss)						(88)
Balance (in shares) at Sep. 30, 2022		347,348,749					6,035,205
Balance at Sep. 30, 2022	15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,698,045	$ 60,352	3,210,765	2,426,765	163
Balance (in shares) at Mar. 31, 2022		344,850,272					6,035,205
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	5,477,953	$ 60,352	3,110,765	2,306,620	216
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		125,838			125,838
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(219,877)			(219,877)		(73,100)			(73,100)
Capital Contributions from Eversource Parent						100,000		100,000
Other comprehensive income (loss)						(23)				(23)
Balance (in shares) at Jun. 30, 2022		346,411,029					6,035,205
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	5,629,278	$ 60,352	3,210,765	2,357,968	193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		143,287			143,287
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(221,387)			(221,387)		(73,100)			(73,100)
Other comprehensive income (loss)						(30)				(30)
Balance (in shares) at Sep. 30, 2022		347,348,749					6,035,205
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,698,045	$ 60,352	3,210,765	2,426,765	163
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					6,035,205
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	5,784,380	$ 60,352	3,260,765	2,463,094	169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039		148,416			148,416
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(235,354)			(235,354)		(82,600)			(82,600)
Other comprehensive income (loss)						36				36
Balance (in shares) at Mar. 31, 2023		348,808,082					6,035,205
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,848,842	$ 60,352	3,260,765	2,527,520	205
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					6,035,205
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	5,784,380	$ 60,352	3,260,765	2,463,094	169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						401,104
Other comprehensive income (loss)						22
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					6,035,205
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	6,057,036	$ 60,352	3,384,265	2,612,228	191
Balance (in shares) at Mar. 31, 2023		348,808,082					6,035,205
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,848,842	$ 60,352	3,260,765	2,527,520	205
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302		133,300			133,300
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	(235,491)			(235,491)		(82,600)			(82,600)
Other comprehensive income (loss)						(7)				(7)
Balance (in shares) at Jun. 30, 2023		349,021,936					6,035,205
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	5,898,145	$ 60,352	3,260,765	2,576,830	198
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543		119,388			119,388
Dividends on Preferred Stock	(1,880)			(1,880)		(1,390)			(1,390)
Dividends on Common Stock	$ (235,691)			(235,691)		(82,600)			(82,600)
Capital Contributions from Eversource Parent						123,500		123,500
Other comprehensive income (loss)						(7)				(7)
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					6,035,205
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ 6,057,036	$ 60,352	$ 3,384,265	$ 2,612,228	$ 191

THE CONNECTICUT LIGHT AND POW_6

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	$ 962,477	$ 885,711
Deferred Income Taxes	78,276	170,752
Uncollectible Expense	40,945	40,753
Pension, SERP, and PBOP Income, Net	(64,311)	(120,416)
Regulatory Over/(Under) Recoveries, Net	(4,148)	(32,193)
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(72,041)
Cost of Removal Expenditures	(237,368)	(284,706)
Other	(114,111)	(34,702)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	6,738	(294,383)
Taxes Receivable/Accrued, Net	177,618	160,260
Accounts Payable	(385,741)	11,821
Other Current Assets and Liabilities, Net	(100,646)	(92,506)
Net Cash Flows (Used In)/Provided by Operating Activities	1,169,153	1,688,904
Investing Activities:
Investments in Property, Plant and Equipment	(3,125,617)	(2,352,743)
Other Investing Activities	(57)	15,245
Net Cash Flows Used in Investing Activities	(3,958,982)	(2,928,140)
Financing Activities:
Cash Dividends on Common Shares	(688,878)	(643,634)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Issuance of Long-Term Debt	4,340,300	4,045,000
Retirement of Long-Term Debt	(1,203,000)	(775,000)
(Decrease)/Increase in Notes Payable to Eversource Parent	87,600	(1,103,950)
Other Financing Activities	(38,189)	(50,191)
Net Cash Flows Provided by Financing Activities	2,448,984	1,620,484
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(340,845)	381,248
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	180,907	602,256
The Connecticut Light and Power Company
Operating Activities:
Net Income	401,104	422,102
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	281,107	264,966
Deferred Income Taxes	115,450	(18,780)
Uncollectible Expense	7,106	10,816
Pension, SERP, and PBOP Income, Net	(13,699)	(21,751)
Regulatory Over/(Under) Recoveries, Net	198,519	(47,620)
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(72,041)
Amortization of Regulatory (Liabilities)/Assets, Net	(425,402)	318,347
Cost of Removal Expenditures	(56,168)	(54,145)
Other	(21,415)	(19,310)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(113,592)	(271,658)
Taxes Receivable/Accrued, Net	107,774	106,737
Accounts Payable	(112,946)	273
Other Current Assets and Liabilities, Net	(47,800)	(63,682)
Net Cash Flows (Used In)/Provided by Operating Activities	320,038	554,254
Investing Activities:
Investments in Property, Plant and Equipment	(797,282)	(608,966)
Other Investing Activities	173	513
Net Cash Flows Used in Investing Activities	(797,109)	(608,453)
Financing Activities:
Cash Dividends on Common Shares	(247,800)	(219,300)
Cash Dividends on Preferred Stock	(4,169)	(4,169)
Capital Contributions from Eversource Parent	123,500	200,000
Issuance of Long-Term Debt	800,000	0
Retirement of Long-Term Debt	(400,000)	0
(Decrease)/Increase in Notes Payable to Eversource Parent	213,400	26,000
Other Financing Activities	(9,244)	0
Net Cash Flows Provided by Financing Activities	475,687	2,531
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(1,384)	(51,668)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	20,327	74,788
Cash and Restricted Cash - End of Period	$ 18,943	$ 23,120

NSTAR ELECTRIC COMPANY AND SUBS

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 78,813	$ 47,597
Cash Equivalents	0	327,006
Receivables, Net (net of allowance for uncollectible accounts)	1,430,183	1,517,138
Unbilled Revenues	171,934	238,968
Materials, Supplies and REC Inventory	445,810	374,395
Regulatory Assets	1,507,888	1,335,491
Prepayments and Other Current Assets	374,471	382,603
Total Current Assets	4,009,099	4,223,198
Property, Plant and Equipment, Net	38,518,294	36,112,820
Deferred Debits and Other Assets:
Regulatory Assets	4,348,700	4,242,794
Prepaid Pension and PBOP	1,238,512	1,045,524
Other Long-Term Assets	597,305	541,344
Total Deferred Debits and Other Assets	13,765,950	12,894,882
Total Assets	56,293,343	53,230,900
Current Liabilities:
Notes Payable	1,529,800	1,442,200
Long-Term Debt – Current Portion	2,071,862	1,320,129
Accounts Payable	1,642,181	2,113,905
Regulatory Liabilities	724,413	890,786
Other Current Liabilities	1,108,178	989,053
Total Current Liabilities	7,119,644	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,238,623	5,067,902
Regulatory Liabilities	4,021,830	3,930,305
Other Long-Term Liabilities	908,731	888,081
Total Deferred Credits and Other Liabilities	10,877,639	10,668,403
Long-Term Debt	22,087,267	19,723,994
Preferred Stock Not Subject to Mandatory Redemption	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,443,820	8,401,731
Retained Earnings	5,666,861	5,527,153
Accumulated Other Comprehensive Income	(24,022)	(39,421)
Common Shareholders' Equity	15,685,941	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	56,293,343	53,230,900
NSTAR Electric Company
Current Assets:
Cash	5,991	738
Cash Equivalents	0	327,006
Unbilled Revenues	46,878	39,680
Materials, Supplies and REC Inventory	140,470	138,352
Regulatory Assets	638,464	492,759
Prepayments and Other Current Assets	73,571	71,276
Total Current Assets	1,478,357	1,558,378
Property, Plant and Equipment, Net	12,409,156	11,626,968
Deferred Debits and Other Assets:
Regulatory Assets	1,190,138	1,221,619
Prepaid Pension and PBOP	646,640	576,809
Other Long-Term Assets	119,884	111,846
Total Deferred Debits and Other Assets	1,956,662	1,910,274
Total Assets	15,844,175	15,095,620
Current Liabilities:
Notes Payable	209,500	0
Long-Term Debt – Current Portion	80,000	80,000
Obligations to Third Party Suppliers	166,995	142,628
Renewable Portfolio Standards Compliance Obligations	88,938	120,239
Regulatory Liabilities	416,046	373,221
Other Current Liabilities	98,907	83,925
Total Current Liabilities	1,671,769	1,468,596
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,812,533	1,700,875
Regulatory Liabilities	1,587,567	1,548,081
Other Long-Term Liabilities	304,228	289,313
Total Deferred Credits and Other Liabilities	3,704,328	3,538,269
Long-Term Debt	4,496,484	4,345,085
Preferred Stock Not Subject to Mandatory Redemption	43,000	43,000
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	2,902,542	2,778,942
Retained Earnings	3,025,841	2,921,444
Accumulated Other Comprehensive Income	211	284
Common Shareholders' Equity	5,928,594	5,700,670
Commitments and Contingencies
Total Liabilities and Capitalization	15,844,175	15,095,620
NSTAR Electric Company | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	523,997	453,371
Current Liabilities:
Accounts Payable	497,660	559,676
NSTAR Electric Company | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	48,986	35,196
Current Liabilities:
Accounts Payable	$ 113,723	$ 108,907

NSTAR ELECTRIC COMPANY AND SU_2

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 542,746	$ 486,297
NSTAR Electric
Allowance for uncollectible accounts	$ 100,826	$ 94,958

NSTAR ELECTRIC COMPANY AND SU_3

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Revenues	$ 2,791,482	$ 3,215,645	$ 9,216,467	$ 9,259,596
Operating Expenses:
Purchased Power and Transmission	1,168,599	1,388,041	4,232,912	3,718,278
Operations and Maintenance	500,711	454,289	1,382,563	1,378,897
Depreciation	329,528	302,143	962,477	885,711
Energy Efficiency Programs	162,425	162,545	531,199	498,708
Taxes Other Than Income Taxes	243,645	240,047	704,989	683,441
Total Operating Expenses	2,260,929	2,658,352	7,375,680	7,583,679
Operating Income/(Loss)	530,553	557,293	1,840,787	1,675,917
Interest Expense	222,283	178,174	624,140	491,509
Other Income, Net	79,123	89,831	262,980	255,253
Income Before Income Tax Expense	387,393	468,950	1,078,627	1,439,661
Income Tax Expense	45,850	117,661	226,743	349,305
Net Income	341,543	351,289
NSTAR Electric Company
Operating Revenues	953,531	1,105,452	2,728,782	2,752,278
Operating Expenses:
Purchased Power and Transmission	308,999	421,217	936,484	971,754
Operations and Maintenance	174,091	161,770	487,026	475,727
Depreciation	94,103	91,194	277,396	269,928
Amortization of Regulatory (Liabilities)/Assets, Net	(6,462)	15,940	14,923	65,307
Energy Efficiency Programs	95,351	105,708	252,255	255,230
Taxes Other Than Income Taxes	68,449	65,085	188,191	185,748
Total Operating Expenses	734,531	860,914	2,156,275	2,223,694
Operating Income/(Loss)	219,000	244,538	572,507	528,584
Interest Expense	48,178	41,829	139,804	119,035
Other Income, Net	39,908	37,895	120,690	101,385
Income Before Income Tax Expense	210,730	240,604	553,393	510,934
Income Tax Expense	46,019	52,520	120,126	110,674
Net Income	$ 164,711	$ 188,084	$ 433,267	$ 400,260

NSTAR ELECTRIC COMPANY AND SU_4

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Income	$ 341,543	$ 351,289
Other Comprehensive Income, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	347,744	351,267	$ 861,644	$ 1,085,986
NSTAR Electric Company
Net Income	164,711	188,084	433,267	400,260
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of SERP Benefit Plan	(35)	(61)	(100)	(132)
Qualified Cash Flow Hedging Instruments	5	5	15	15
Changes in Unrealized (Losses)/Gains on Marketable Securities	0	(6)	12	(19)
Other Comprehensive (Loss)/Income, Net of Tax	(30)	(62)	(73)	(136)
Comprehensive Income Attributable to Common Shareholders	$ 164,681	$ 188,022	$ 433,194	$ 400,124

NSTAR ELECTRIC COMPANY AND SU_5

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	NSTAR Electric	NSTAR Electric Common Stock	NSTAR Electric Capital Surplus, Paid In	NSTAR Electric Retained Earnings	NSTAR Electric Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2021		344,403,196					200
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	$ 8,098,514	$ 5,005,391	$ (42,275)	$ 4,973,019	$ 0	$ 2,253,942	$ 2,718,576	$ 501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		92,739			92,739
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(219,768)			(219,768)		(71,900)			(71,900)
Other comprehensive income (loss)						(47)				(47)
Balance (in shares) at Mar. 31, 2022		344,850,272					200
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	4,993,321	$ 0	2,253,942	2,738,925	454
Balance (in shares) at Dec. 31, 2021		344,403,196					200
Balance at Dec. 31, 2021	14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	4,973,019	$ 0	2,253,942	2,718,576	501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						400,260
Other comprehensive income (loss)						(136)
Balance (in shares) at Sep. 30, 2022		347,348,749					200
Balance at Sep. 30, 2022	15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,205,973	$ 0	2,303,942	2,901,666	365
Balance (in shares) at Mar. 31, 2022		344,850,272					200
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	4,993,321	$ 0	2,253,942	2,738,925	454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		119,437			119,437
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(219,877)			(219,877)		(71,900)			(71,900)
Capital Contributions from Eversource Parent						50,000		50,000
Other comprehensive income (loss)						(27)				(27)
Balance (in shares) at Jun. 30, 2022		346,411,029					200
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	5,090,341	$ 0	2,303,942	2,785,972	427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		188,084			188,084
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(221,387)			(221,387)		(71,900)			(71,900)
Other comprehensive income (loss)						(62)				(62)
Balance (in shares) at Sep. 30, 2022		347,348,749					200
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	5,205,973	$ 0	2,303,942	2,901,666	365
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					200
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	5,700,670	$ 0	2,778,942	2,921,444	284
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039		133,813			133,813
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(235,354)			(235,354)		(327,400)			(327,400)
Capital Contributions from Eversource Parent						31,300		31,300
Other comprehensive income (loss)						(16)				(16)
Balance (in shares) at Mar. 31, 2023		348,808,082					200
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,537,877	$ 0	2,810,242	2,727,367	268
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					200
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	5,700,670	$ 0	2,778,942	2,921,444	284
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						433,267
Other comprehensive income (loss)						(73)
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					200
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	5,928,594	$ 0	2,902,542	3,025,841	211
Balance (in shares) at Mar. 31, 2023		348,808,082					200
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	5,537,877	$ 0	2,810,242	2,727,367	268
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302		134,743			134,743
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	(235,491)			(235,491)
Capital Contributions from Eversource Parent						81,000		81,000
Other comprehensive income (loss)						(27)				(27)
Balance (in shares) at Jun. 30, 2023		349,021,936					200
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	5,753,103	$ 0	2,891,242	2,861,620	241
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543		164,711			164,711
Dividends on Preferred Stock	(1,880)			(1,880)		(490)			(490)
Dividends on Common Stock	$ (235,691)			(235,691)
Capital Contributions from Eversource Parent						11,300		11,300
Other comprehensive income (loss)						(30)				(30)
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					200
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ 5,928,594	$ 0	$ 2,902,542	$ 3,025,841	$ 211

NSTAR ELECTRIC COMPANY AND SU_6

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	$ 962,477	$ 885,711
Deferred Income Taxes	78,276	170,752
Uncollectible Expense	40,945	40,753
Pension, SERP and PBOP Income, Net	(64,311)	(120,416)
Pension Contributions	(5,000)	(80,000)
Regulatory Over/(Under) Recoveries, Net	(4,148)	(32,193)
Cost of Removal Expenditures	(237,368)	(284,706)
Other	(114,111)	(34,702)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	6,738	(294,383)
Taxes Receivable/Accrued, Net	177,618	160,260
Accounts Payable	(385,741)	11,821
Other Current Assets and Liabilities, Net	(100,646)	(92,506)
Net Cash Flows (Used In)/Provided by Operating Activities	1,169,153	1,688,904
Investing Activities:
Investments in Property, Plant and Equipment	(3,125,617)	(2,352,743)
Other Investing Activities	(57)	15,245
Net Cash Flows Used in Investing Activities	(3,958,982)	(2,928,140)
Financing Activities:
Cash Dividends on Common Shares	(688,878)	(643,634)
Cash Dividends on Preferred Stock	(5,639)	(5,639)
Issuance of Long-Term Debt	4,340,300	4,045,000
(Decrease)/Increase in Notes Payable to Eversource Parent	87,600	(1,103,950)
Other Financing Activities	(38,189)	(50,191)
Net Cash Flows Provided by Financing Activities	2,448,984	1,620,484
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(340,845)	381,248
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	180,907	602,256
NSTAR Electric
Operating Activities:
Net Income	433,267	400,260
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	277,396	269,928
Deferred Income Taxes	72,220	34,025
Uncollectible Expense	12,988	12,159
Pension, SERP and PBOP Income, Net	(31,007)	(41,790)
Pension Contributions	0	(15,000)
Regulatory Over/(Under) Recoveries, Net	(103,903)	(36,203)
Amortization of Regulatory (Liabilities)/Assets, Net	14,923	65,307
Cost of Removal Expenditures	(49,379)	(33,467)
Payment in 2022 of Withheld Property Taxes	0	(76,084)
Other	(11,174)	(8,961)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(76,989)	(67,950)
Taxes Receivable/Accrued, Net	61,773	122,467
Accounts Payable	(60,363)	(55,676)
Other Current Assets and Liabilities, Net	(10,752)	65,609
Net Cash Flows (Used In)/Provided by Operating Activities	529,000	634,624
Investing Activities:
Investments in Property, Plant and Equipment	(1,012,357)	(691,940)
Other Investing Activities	48	143
Net Cash Flows Used in Investing Activities	(1,012,309)	(691,797)
Financing Activities:
Cash Dividends on Common Shares	(327,400)	(215,700)
Cash Dividends on Preferred Stock	(1,470)	(1,470)
Issuance of Long-Term Debt	150,000	850,000
Capital Contributions from Eversource Parent	123,600	50,000
(Decrease)/Increase in Notes Payable to Eversource Parent	0	2,800
Increase/(Decrease) in Notes Payable	209,500	(162,500)
Other Financing Activities	(1,368)	(13,191)
Net Cash Flows Provided by Financing Activities	152,862	509,939
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(330,447)	452,766
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	345,293	18,179
Cash and Restricted Cash - End of Period	$ 14,846	$ 470,945

PUBLIC SERVICE COMPANY OF NEW H

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 78,813	$ 47,597
Receivables, Net (net of allowance for uncollectible accounts)	1,430,183	1,517,138
Unbilled Revenues	171,934	238,968
Materials, Supplies and REC Inventory	445,810	374,395
Regulatory Assets	1,507,888	1,335,491
Prepayments and Other Current Assets	374,471	382,603
Total Current Assets	4,009,099	4,223,198
Property, Plant and Equipment, Net	38,518,294	36,112,820
Deferred Debits and Other Assets:
Regulatory Assets	4,348,700	4,242,794
Prepaid Pension and PBOP	1,238,512	1,045,524
Other Long-Term Assets	597,305	541,344
Total Deferred Debits and Other Assets	13,765,950	12,894,882
Total Assets	56,293,343	53,230,900
Current Liabilities:
Long-Term Debt – Current Portion	2,071,862	1,320,129
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,642,181	2,113,905
Regulatory Liabilities	724,413	890,786
Other Current Liabilities	1,108,178	989,053
Total Current Liabilities	7,119,644	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,238,623	5,067,902
Regulatory Liabilities	4,021,830	3,930,305
Other Long-Term Liabilities	908,731	888,081
Total Deferred Credits and Other Liabilities	10,877,639	10,668,403
Long-Term Debt	22,087,267	19,723,994
Rate Reduction Bonds	367,282	410,492
Common Shareholders' Equity:
Capital Surplus, Paid In	8,443,820	8,401,731
Retained Earnings	5,666,861	5,527,153
Accumulated Other Comprehensive Loss	(24,022)	(39,421)
Common Shareholders' Equity	15,685,941	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	56,293,343	53,230,900
PSNH
Current Assets:
Cash	33,943	136
Unbilled Revenues	44,540	72,713
Taxes Receivable	24,280	27,978
Materials, Supplies and REC Inventory	59,555	34,521
Regulatory Assets	177,120	102,240
Special Deposits	18,185	33,140
Prepayments and Other Current Assets	2,900	13,297
Total Current Assets	537,366	465,555
Property, Plant and Equipment, Net	4,433,033	4,060,224
Deferred Debits and Other Assets:
Regulatory Assets	739,372	593,974
Prepaid Pension and PBOP	83,111	66,384
Other Long-Term Assets	11,997	16,517
Total Deferred Debits and Other Assets	834,480	676,875
Total Assets	5,804,879	5,202,654
Current Liabilities:
Notes Payable to Eversource Parent	100	173,300
Long-Term Debt – Current Portion	325,000	29,668
Rate Reduction Bonds – Current Portion	43,210	43,210
Regulatory Liabilities	114,561	161,963
Other Current Liabilities	83,046	59,616
Total Current Liabilities	795,639	795,544
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	668,174	562,802
Regulatory Liabilities	391,013	391,628
Other Long-Term Liabilities	40,931	37,087
Total Deferred Credits and Other Liabilities	1,100,118	991,517
Long-Term Debt	1,431,584	1,134,914
Rate Reduction Bonds	367,282	410,492
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,498,134	1,298,134
Retained Earnings	612,122	572,126
Accumulated Other Comprehensive Loss	0	(73)
Common Shareholders' Equity	2,110,256	1,870,187
Commitments and Contingencies
Total Liabilities and Capitalization	5,804,879	5,202,654
PSNH | Nonrelated Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	159,704	173,337
Current Liabilities:
Accounts Payable	193,802	291,556
PSNH | Related Party
Current Assets:
Receivables, Net (net of allowance for uncollectible accounts)	17,139	8,193
Current Liabilities:
Notes Payable to Eversource Parent	100	173,300
Accounts Payable	$ 35,920	$ 36,231

PUBLIC SERVICE COMPANY OF NEW_2

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 542,746	$ 486,297
PSNH
Allowance for uncollectible accounts	$ 12,408	$ 29,236

PUBLIC SERVICE COMPANY OF NEW_3

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Revenues	$ 2,791,482	$ 3,215,645	$ 9,216,467	$ 9,259,596
Operating Expenses:
Purchased Power and Transmission	1,168,599	1,388,041	4,232,912	3,718,278
Operations and Maintenance	500,711	454,289	1,382,563	1,378,897
Depreciation	329,528	302,143	962,477	885,711
Energy Efficiency Programs	162,425	162,545	531,199	498,708
Taxes Other Than Income Taxes	243,645	240,047	704,989	683,441
Total Operating Expenses	2,260,929	2,658,352	7,375,680	7,583,679
Operating Income/(Loss)	530,553	557,293	1,840,787	1,675,917
Interest Expense	222,283	178,174	624,140	491,509
Other Income, Net	79,123	89,831	262,980	255,253
Income Before Income Tax Expense	387,393	468,950	1,078,627	1,439,661
Income Tax Expense	45,850	117,661	226,743	349,305
Net Income	341,543	351,289
PSNH
Operating Revenues	353,074	430,642	1,123,300	1,077,124
Operating Expenses:
Purchased Power and Transmission	128,040	215,360	499,553	452,007
Operations and Maintenance	85,230	67,811	217,529	194,114
Depreciation	35,517	32,187	104,307	94,997
Amortization of Regulatory (Liabilities)/Assets, Net	(9,963)	7,398	(35,234)	43,449
Energy Efficiency Programs	11,097	11,142	30,473	28,678
Taxes Other Than Income Taxes	25,748	25,331	73,384	73,377
Total Operating Expenses	275,669	359,229	890,012	886,622
Operating Income/(Loss)	77,405	71,413	233,288	190,502
Interest Expense	19,252	15,030	55,901	43,432
Other Income, Net	7,180	8,073	19,199	23,365
Income Before Income Tax Expense	65,333	64,456	196,586	170,435
Income Tax Expense	13,995	13,009	44,590	36,364
Net Income	$ 51,338	$ 51,447	$ 151,996	$ 134,071

PUBLIC SERVICE COMPANY OF NEW_4

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Income	$ 341,543	$ 351,289
Other Comprehensive (Loss)/Income, Net of Tax:
Comprehensive Income Attributable to Common Shareholders	347,744	351,267	$ 861,644	$ 1,085,986
PSNH
Net Income	51,338	51,447	151,996	134,071
Other Comprehensive (Loss)/Income, Net of Tax:
Changes in Unrealized (Losses)/Gains on Marketable Securities	0	(39)	73	(117)
Other Comprehensive (Loss)/Income, Net of Tax	0	(39)	73	(117)
Comprehensive Income Attributable to Common Shareholders	$ 51,338	$ 51,408	$ 152,069	$ 133,954

PUBLIC SERVICE COMPANY OF NEW_5

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	PSNH	PSNH Common Stock	PSNH Capital Surplus, Paid In	PSNH Retained Earnings	PSNH Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2021		344,403,196					301
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	$ 8,098,514	$ 5,005,391	$ (42,275)	$ 1,592,713	$ 0	$ 1,088,134	$ 504,556	$ 23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326		45,586			45,586
Dividends on Common Stock	(219,768)			(219,768)		(26,000)			(26,000)
Other comprehensive income (loss)						(48)				(48)
Other Comprehensive Income (Loss)	704				704
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Balance (in shares) at Dec. 31, 2021		344,403,196					301
Balance at Dec. 31, 2021	14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	1,592,713	$ 0	1,088,134	504,556	23
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						134,071
Other comprehensive income (loss)						(117)
Other Comprehensive Income (Loss)	1,269
Balance (in shares) at Sep. 30, 2022		347,348,749					301
Balance at Sep. 30, 2022	15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	1,828,667	$ 0	1,268,134	560,627	(94)
Balance (in shares) at Mar. 31, 2022		344,850,272					301
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	1,612,251	$ 0	1,088,134	524,142	(25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742		37,038			37,038
Dividends on Common Stock	(219,877)			(219,877)		(26,000)			(26,000)
Capital Contributions from Eversource Parent						180,000		180,000
Other comprehensive income (loss)						(30)				(30)
Other Comprehensive Income (Loss)	(1,293)				(1,293)
Balance (in shares) at Jun. 30, 2022		346,411,029					301
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	1,803,259	$ 0	1,268,134	535,180	(55)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289		51,447			51,447
Dividends on Common Stock	(221,387)			(221,387)		(26,000)			(26,000)
Other comprehensive income (loss)						(39)				(39)
Other Comprehensive Income (Loss)	1,858				1,858
Balance (in shares) at Sep. 30, 2022		347,348,749					301
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	1,828,667	$ 0	1,268,134	560,627	(94)
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					301
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	1,870,187	$ 0	1,298,134	572,126	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039		40,296			40,296
Dividends on Common Stock	(235,354)			(235,354)		(28,000)			(28,000)
Other comprehensive income (loss)						73				73
Other Comprehensive Income (Loss)	3,230				3,230
Balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	1,882,556	$ 0	1,298,134	584,422	0
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855					301
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	1,870,187	$ 0	1,298,134	572,126	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income						151,996
Other comprehensive income (loss)						73
Other Comprehensive Income (Loss)	$ 15,399
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					301
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	2,110,256	$ 0	1,498,134	612,122	0
Balance (in shares) at Mar. 31, 2023		348,808,082					301
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	1,882,556	$ 0	1,298,134	584,422	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302		60,362			60,362
Dividends on Common Stock	(235,491)			(235,491)		(28,000)			(28,000)
Capital Contributions from Eversource Parent						100,000		100,000
Other Comprehensive Income (Loss)	4,088				4,088
Balance (in shares) at Jun. 30, 2023		349,021,936					301
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	2,014,918	$ 0	1,398,134	616,784	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543		51,338			51,338
Dividends on Common Stock	(235,691)			(235,691)		(56,000)			(56,000)
Capital Contributions from Eversource Parent						100,000		100,000
Other comprehensive income (loss)						0
Other Comprehensive Income (Loss)	$ 8,081				8,081
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775					301
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ 2,110,256	$ 0	$ 1,498,134	$ 612,122	$ 0

PUBLIC SERVICE COMPANY OF NEW_6

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	$ 962,477	$ 885,711
Deferred Income Taxes	78,276	170,752
Uncollectible Expense	40,945	40,753
Pension, SERP and PBOP Income, Net	(64,311)	(120,416)
Regulatory Over/(Underrecoveries), Net	(4,148)	(32,193)
Cost of Removal Expenditures	(237,368)	(284,706)
Other	(114,111)	(34,702)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	6,738	(294,383)
Taxes Receivable/Accrued, Net	177,618	160,260
Accounts Payable	(385,741)	11,821
Other Current Assets and Liabilities, Net	(100,646)	(92,506)
Net Cash Flows (Used In)/Provided by Operating Activities	1,169,153	1,688,904
Investing Activities:
Investments in Property, Plant and Equipment	(3,125,617)	(2,352,743)
Other Investing Activities	(57)	15,245
Net Cash Flows Used in Investing Activities	(3,958,982)	(2,928,140)
Financing Activities:
Cash Dividends on Common Shares	(688,878)	(643,634)
Issuance of Long-Term Debt	4,340,300	4,045,000
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
(Decrease)/Increase in Notes Payable to Eversource Parent	87,600	(1,103,950)
Other Financing Activities	(38,189)	(50,191)
Net Cash Flows Provided by Financing Activities	2,448,984	1,620,484
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	(340,845)	381,248
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	180,907	602,256
PSNH
Operating Activities:
Net Income	151,996	134,071
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	104,307	94,997
Deferred Income Taxes	96,711	(12,212)
Uncollectible Expense	1,534	8,060
Pension, SERP and PBOP Income, Net	(7,841)	(12,269)
Regulatory Over/(Underrecoveries), Net	(251,048)	63,423
Amortization of Regulatory (Liabilities)/Assets, Net	(35,234)	43,449
Cost of Removal Expenditures	(29,448)	(25,682)
Other	11,479	10,317
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	4,011	(66,751)
Taxes Receivable/Accrued, Net	27,797	20,986
Accounts Payable	(70,102)	(3,969)
Other Current Assets and Liabilities, Net	(17,092)	(7,681)
Net Cash Flows (Used In)/Provided by Operating Activities	(12,930)	246,739
Investing Activities:
Investments in Property, Plant and Equipment	(431,937)	(346,318)
Other Investing Activities	296	879
Net Cash Flows Used in Investing Activities	(431,641)	(345,439)
Financing Activities:
Cash Dividends on Common Shares	(112,000)	(78,000)
Capital Contributions from Eversource Parent	200,000	180,000
Issuance of Long-Term Debt	600,000	0
Repayment of Rate Reduction Bonds	(43,210)	(43,210)
(Decrease)/Increase in Notes Payable to Eversource Parent	(173,200)	29,100
Other Financing Activities	(8,524)	(70)
Net Cash Flows Provided by Financing Activities	463,066	87,820
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash	18,495	(10,880)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	36,812	35,126
Cash and Restricted Cash - End of Period	$ 55,307	$ 24,246

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
	Sep. 30, 2023
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 EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.4 million electric, natural gas and water customers through twelve 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 2022 Form 10-K, which was filed with the SEC on February 15, 2023. 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, 2023 and December 31, 2022, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2023 and 2022, and the cash flows for the nine months ended September 30, 2023 and 2022. The results of operations and comprehensive income for the three and nine months ended September 30, 2023 and 2022 and the cash flows for the nine months ended September 30, 2023 and 2022 are not necessarily indicative of the results expected for a full year. CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of 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. Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation. B. 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). 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 an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current economic conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, 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 conditions, 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. Management concluded that the reserve balance as of September 30, 2023 adequately reflected the collection risk and net realizable value for its receivables. As of both September 30, 2023 and December 31, 2022, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $50.9 million at Eversource, $16.0 million at CL&P, and $4.1 million at NSTAR Electric. At our Connecticut and Massachusetts utilities, the COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs 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. No COVID-19 related uncollectible amounts were deferred at PSNH as a result of a July 2021 NHPUC order. Based on the status of our COVID-19 regulatory dockets, policies and practices in the jurisdictions in which we operate, we believe the state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental uncollectible customer receivable costs associated with COVID-19. 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 30 th is as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance (2) Three Months Ended 2023 Beginning Balance $ 338.2 $ 194.2 $ 532.4 $ 226.5 $ 36.3 $ 262.8 $ 45.6 $ 52.2 $ 97.8 $ 12.7 Uncollectible Expense — 16.8 16.8 — 2.4 2.4 — 5.2 5.2 2.0 Uncollectible Costs Deferred (1) 33.9 14.0 47.9 29.4 3.1 32.5 3.4 4.5 7.9 1.1 Write-Offs (17.5) (40.4) (57.9) (14.9) (7.6) (22.5) 0.1 (11.5) (11.4) (3.6) Recoveries Collected 0.2 3.3 3.5 0.2 0.9 1.1 — 1.3 1.3 0.2 Ending Balance $ 354.8 $ 187.9 $ 542.7 $ 241.2 $ 35.1 $ 276.3 $ 49.1 $ 51.7 $ 100.8 $ 12.4 Nine Months Ended 2023 Beginning Balance $ 284.4 $ 201.9 $ 486.3 $ 188.9 $ 36.4 $ 225.3 $ 43.7 $ 51.3 $ 95.0 $ 29.2 Uncollectible Expense — 40.9 40.9 — 7.1 7.1 — 13.0 13.0 1.5 Uncollectible Costs Deferred (1) 104.7 22.8 127.5 80.3 9.3 89.6 5.8 13.8 19.6 (11.1) Write-Offs (35.3) (88.5) (123.8) (29.0) (21.3) (50.3) (0.4) (30.4) (30.8) (7.8) Recoveries Collected 1.0 10.8 11.8 1.0 3.6 4.6 — 4.0 4.0 0.6 Ending Balance $ 354.8 $ 187.9 $ 542.7 $ 241.2 $ 35.1 $ 276.3 $ 49.1 $ 51.7 $ 100.8 $ 12.4 Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2022 Beginning Balance $ 242.7 $ 215.1 $ 457.8 $ 152.1 $ 40.6 $ 192.7 $ 45.0 $ 55.5 $ 100.5 $ 27.3 Uncollectible Expense — 10.7 10.7 — 4.1 4.1 — 3.5 3.5 3.5 Uncollectible Costs Deferred (1) 15.6 9.4 25.0 11.3 2.0 13.3 2.8 4.0 6.8 0.1 Write-Offs (6.5) (33.2) (39.7) (5.0) (7.7) (12.7) (0.3) (12.3) (12.6) (2.3) Recoveries Collected 0.3 3.5 3.8 0.2 1.0 1.2 — 1.3 1.3 0.2 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Nine Months Ended 2022 Beginning Balance $ 226.1 $ 191.3 $ 417.4 $ 144.6 $ 36.7 $ 181.3 $ 43.3 $ 53.7 $ 97.0 $ 24.3 Uncollectible Expense — 40.8 40.8 — 10.8 10.8 — 12.2 12.2 8.1 Uncollectible Costs Deferred (1) 38.0 36.7 74.7 22.3 2.0 24.3 4.9 11.8 16.7 1.2 Write-Offs (13.5) (76.3) (89.8) (9.4) (14.4) (23.8) (0.7) (30.6) (31.3) (5.4) Recoveries Collected 1.5 13.0 14.5 1.1 4.9 6.0 — 4.9 4.9 0.6 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 (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 uncollectible energy supply costs and COVID-19. The increase in the allowance for uncollectible hardship accounts in 2023 at Eversource and CL&P primarily relates to increased customer enrollment in disconnection prevention programs in Connecticut. (2) In connection with PSNH’s pole purchase agreement on May 1, 2023, the purchase price included the forgiveness of previously reserved receivables for reimbursement of operation and maintenance and vegetation management costs. C. 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 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, AROs, and in the valuation of business combinations and asset acquisitions. 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 1E, “Summary of Significant Accounting Policies - Investments in Unconsolidated Affiliates,” Note 4, "Derivative Instruments," Note 5, "Marketable Securities," and Note 10, "Fair Value of Financial Instruments," to the financial statements. D. Other Income, Net The components of Other Income, Net on the statements of income were as follows: For the Three Months Ended September 30, 2023 September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 28.5 $ 7.0 $ 12.9 $ 3.7 $ 55.3 $ 16.2 $ 21.6 $ 6.8 AFUDC Equity 21.0 5.2 12.5 1.6 12.6 3.7 6.5 0.7 Equity in Earnings of Unconsolidated Affiliates 2.7 — 0.1 — 3.8 — 0.1 — Investment Income 2.7 1.5 0.7 0.4 1.3 0.2 0.4 0.2 Interest Income 24.1 4.6 13.6 1.5 14.1 1.8 9.2 0.4 Other 0.1 — 0.1 — 2.7 — 0.1 — Total Other Income, Net $ 79.1 $ 18.3 $ 39.9 $ 7.2 $ 89.8 $ 21.9 $ 37.9 $ 8.1 For the Nine Months Ended September 30, 2023 September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 96.6 $ 24.9 $ 41.7 $ 11.8 $ 164.5 $ 48.3 $ 64.0 $ 20.1 AFUDC Equity 55.5 13.9 34.0 3.4 33.7 9.3 17.5 1.7 Equity in Earnings of Unconsolidated Affiliates (1) 11.5 — 0.3 — 20.8 — 0.2 — Investment (Loss)/Income (0.4) (0.2) 0.5 — 2.4 (0.9) 0.6 0.5 Interest Income 68.6 8.0 44.0 3.6 30.3 4.6 18.8 1.1 Other (1) 31.2 — 0.2 0.4 3.6 — 0.3 — Total Other Income, Net $ 263.0 $ 46.6 $ 120.7 $ 19.2 $ 255.3 $ 61.3 $ 101.4 $ 23.4 (1) Eversource’s equity method investment in a renewable energy fund was liquidated in March 2023. Liquidation proceeds in excess of the carrying value were recorded in 2023 within Other in the table above. See Note 1E, "Summary of Significant Accounting Policies - Investments in Unconsolidated Affiliates," for further information. For the nine months ended September 30, 2022, pre-tax income of $12.2 million associated with this investment was included in Equity in Earnings of Unconsolidated Affiliates within Other Income, Net in the table above. E. Investments in Unconsolidated Affiliates Investments in entities that are not consolidated are included in long-term assets on the balance sheets and earnings impacts from these equity investments are included in Other Income, Net on the statements of income. Eversource's investments included the following: Investment Balance (Millions of Dollars) Ownership Interest As of September 30, 2023 As of December 31, 2022 Offshore Wind Business 50 % $ 2,578.6 $ 1,947.1 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 116.8 118.8 Renewable Energy Investment Fund 90 % — 84.1 Other various 28.5 26.1 Total Investments in Unconsolidated Affiliates $ 2,723.9 $ 2,176.1 Equity method investments are assessed for impairment when conditions exist that indicate that the fair value of the investment is less than book value. Eversource continually monitors and evaluates its equity method investments to determine if there are indicators of an other-than-temporary impairment. If the decline in value is considered to be other-than-temporary, the investment is written down to its estimated fair value, which establishes a new cost basis in the investment. Impairment evaluations involve a significant degree of judgment and estimation, including identifying circumstances that indicate an impairment may exist at the equity method investment level, selecting discount rates used to determine fair values, and developing an estimate of discounted future cash flows expected from investment operations or the sale of the investment. Offshore Wind Business: Eversource’s offshore wind business includes 50 percent ownership interests in North East Offshore and South Fork Class B Member, LLC, which collectively hold PPAs for the Revolution Wind and South Fork Wind projects and an Offshore Wind Renewable Energy Certificate (OREC) contract for the Sunrise Wind project. Eversource’s offshore wind business also includes a tax equity investment in South Fork Wind through a 100 percent ownership in South Fork Wind Holdings, LLC Class A shares. The offshore wind projects are being developed and constructed through joint and equal partnerships with Ørsted. On May 25, 2023, Eversource announced that it had completed the strategic review of its offshore wind investment portfolio and determined that it would continue to pursue the sale of its offshore wind investment. The sale process of Eversource’s existing 50 percent interest in its three jointly-owned, contracted offshore wind projects continues to progress, and Eversource anticipates an announcement in the near term. On September 7, 2023, Eversource completed the sale of its 50 percent interest in an uncommitted lease area consisting of approximately 175,000 developable acres located 25 miles off the south coast of Massachusetts to Ørsted for $625 million in an all-cash transaction. Eversource and Ørsted had entered into the purchase and sale agreement of this uncommitted lease area on May 25, 2023. In September of 2023, Eversource and Ørsted executed a Tax Equity Capital Contribution Agreement for South Fork Wind and funded this tax equity investment. Eversource made a contribution of $528 million using the proceeds from the lease area sale to provide tax equity for South Fork Wind through this new tax equity member interest. In exchange for its investment, Eversource expects to receive investment tax credits as turbines are placed in service for South Fork Wind. These credits will be utilized to reduce Eversource’s federal tax liability, including refunds expected over the next twelve to eighteen months. South Fork Wind is expected to be fully in-service in early 2024. In the second quarter of 2023, in connection with the conclusion of the strategic review, Eversource evaluated its aggregate investment in the projects, uncommitted lease area, and other related capitalized costs and determined that the carrying value of the equity method offshore wind investment exceeded the fair value of the investment and that the decline was other-than-temporary. The estimate of fair value was based on future cash flows arising from the expected sale price of Eversource’s 50 percent interest in the three contracted projects based on the most recent bid value, the sale price of the uncommitted lease area included in the purchase and sale agreement, expected investment tax credits and potential investment tax credit adder amounts, and the value of the tax equity ownership interest. As a result, Eversource recognized a pre-tax other-than-temporary impairment charge of $401.0 million ($331.0 million after-tax, which includes the impact of a $40 million valuation allowance for federal and state capital loss carryforwards) in the second quarter of 2023. The impairment evaluation involved judgments in developing the estimate and timing of future cash flows arising from the anticipated sale transactions, including future project spending amounts that could reduce the ultimate sales value, expected ability to qualify the Revolution Wind and Sunrise Wind projects for investment tax credit adders, the expectation of improved Sunrise Wind OREC contract value, and the selection of the discount rate used to determine fair value, all of which are Level 3 fair value measurements. The assumptions used in the discounted cash flow analysis are subject to inherent uncertainties and subjectivity. The use of different assumptions, estimates, or judgments with respect to the estimation of future cash flows could materially increase the impairment charge. The impairment evaluation was based on best information available at the impairment assessment date. Management evaluated its investment as of September 30, 2023 and concluded that, considering all facts and circumstances as of that date, there were no impairment triggering events in the third quarter of 2023. Accordingly, no additional impairment charge was applicable. The impairment valuation model includes a key judgment of future cash flows from the sale of the Sunrise Wind project of up to $450 million, which was based on the expectation of a successful repricing of the Sunrise Wind OREC contract. In June 2023, Sunrise Wind had filed a petition with the New York State Public Service Commission for an order authorizing NYSERDA to amend the Sunrise Wind OREC contract to incorporate interconnection costs and to provide for inflation adjustments. This value for Sunrise Wind was assessed through September 30, 2023, assuming that the contract repricing would be successful given NYSERDA’s public support for pricing adjustments. On October 12, 2023, the New York State Public Service Commission denied this petition. New York is in the process of establishing an expedited offshore wind renewable energy solicitation, with NYSERDA issuing a request for information to potential bidders on October 26, 2023. Eversource and Ørsted are evaluating the next steps in this re-bidding process. Given the unfavorable development on the OREC pricing denial in the fourth quarter of 2023, Eversource will evaluate the project’s next steps and probability of success in the New York re-bidding process. It is possible that adverse developments could impact the fair value of Sunrise Wind and could result in a significant impairment in a future period. Another key assumption in the impairment model of our offshore wind investment was investment tax credit (“ITC”) adders that were included in the Inflation Reduction Act. An ITC adder is an additional 10 percent of credit value for ITC eligible costs and include two distinct qualifications related to either using domestic sourced materials (domestic content) or construction of an onshore substation in a designated community (energy communities). Similar to the base ITC of 30 percent of the eligible costs, any ITC adders generated would be used to reduce Eversource’s current federal tax liability and could be used to receive tax refunds from prior years as well. Management estimated in the second quarter of 2023 that it would be able to realize a 10 percent ITC adder for both the Sunrise Wind and Revolution Wind projects, which is a total expected value of approximately $400 million. There is uncertainty at this time as to whether or not those ITC adders can be achieved, and management continues to evaluate the project’s qualifications and to monitor guidance issued by the United States Treasury Department. A change in the expected value or qualification of ITC adders could result in a significant impairment in a future period. The three contracted offshore wind projects also are facing construction and scheduling related pressures, which may cause additional required capital contributions from Eversource that are not factored into the expected sales price. It is possible that these future spending amounts could result in a significant impairment charge in a future period. Management will continue to monitor and evaluate all facts and circumstances in the offshore wind sales process and the impact on its investment balance. The fair value of the investment will be updated based on changes in critical assumptions, the final sales price, and final sales terms. It is possible that there will be changes in our expectations of the timing of the sale of our three projects. Adverse changes in facts and circumstances of estimates and timing of future cash flows and the factors described above could result in the recognition of additional, significant impairment charges and could be material to the financial statements. The impairment charge was a non-cash charge and did not impact Eversource’s cash position. Eversource will continue to make future cash expenditures for required cash contributions to its offshore wind investment up to the time of the sale of the offshore wind projects. Proceeds from the transaction will be used to pay off parent company debt. Eversource’s expected sale of its offshore wind investment does not impact the presentation of the September 30, 2023 financial statements. Proceeds received from the sale of the uncommitted lease area and the contribution for the tax equity investment in South Fork Wind, along with continued capital contributions in the offshore wind investment, are included in Investments in Unconsolidated Affiliates within investing activities on the statement of cash flows for the nine months ended September 30, 2023. Liquidation of Renewable Energy Investment Fund: On March 21, 2023, Eversource’s equity method investment in a renewable energy investment fund was liquidated by the fund’s general partner in accordance with the partnership agreement. Proceeds received from the liquidation totaled $147.0 million and are included in Investments in Unconsolidated Affiliates within investing activities on the statement of cash flows. Of this amount, $123.4 million was received in the first quarter of 2023, and $23.6 million was received from escrow in the second quarter of 2023. A portion of the proceeds was used to make a charitable contribution to the Eversource Energy Foundation (a related party) of $20.0 million in the first quarter of 2023. The liquidation benefit received in excess of the investment’s carrying value and the charitable contribution are included in Other Income, Net on the statement of income. 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, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Eversource $ 53.7 $ 52.9 $ 153.4 $ 146.0 CL&P 50.2 49.2 132.2 126.0 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, 2023 As of September 30, 2022 Eversource $ 462.4 $ 394.1 CL&P 86.3 96.7 NSTAR Electric 135.9 94.5 PSNH 71.9 49.7 The following table reconciles cash and cash equivalents as reported on the balance sheets to the cash, cash equivalents and restricted cash balance as reported on the statements of cash flows: As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Cash and Cash Equivalents as reported on the Balance Sheets $ 78.8 $ 9.8 $ 6.0 $ 33.9 $ 374.6 $ 11.3 $ 327.7 $ 0.1 Restricted cash included in: Special Deposits 68.4 9.1 8.8 18.2 102.2 8.8 17.5 33.1 Marketable Securities 16.2 — — — 25.4 0.2 0.1 0.4 Other Long-Term Assets 17.5 — — 3.2 19.6 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 180.9 $ 18.9 $ 14.8 $ 55.3 $ 521.8 $ 20.3 $ 345.3 $ 36.8 Special Deposits represent cash collections related to the PSNH RRB customer charges that are held in trust, required ISO-NE cash deposits, cash held in escrow accounts, and CYAPC and YAEC cash balances. Special Deposits are included in Current Assets on the balance sheets. As of both September 30, 2023 and December 31, 2022, restricted cash included in Marketable Securities represented restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations. As of December 31, 2022, restricted cash included in Marketable Securities also included money market funds held in trusts to fund certain non-qualified executive benefits. Restricted cash includes an Energy Relief Fund for energy efficiency and clean energy measures in the Merrimack Valley established under the terms of the EGMA 2020 settlement agreement. This restricted cash included $20.0 million recorded as short-term in Special Deposits as of both September 30, 2023 and December 31, 2022, and $14.3 million and $15.9 million recorded in Other Long-Term Assets on the balance sheets as of September 30, 2023 and December 31, 2022, respectively.

REGULATORY ACCOUNTING

REGULATORY ACCOUNTING	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Storm Costs, Net $ 1,700.6 $ 882.7 $ 553.9 $ 264.0 $ 1,379.1 $ 799.3 $ 484.4 $ 95.4 Regulatory Tracking Mechanisms 1,173.3 254.3 473.4 166.1 1,075.3 216.8 391.5 73.7 Benefit Costs 863.4 143.2 278.0 51.8 921.7 156.7 299.5 56.6 Income Taxes, Net 879.6 504.5 125.7 17.6 853.3 491.1 115.6 16.0 Securitized Stranded Costs 403.3 — — 403.3 435.7 — — 435.7 Goodwill-related 268.3 — 230.4 — 281.0 — 241.2 — Derivative Liabilities 136.6 136.6 — — 181.8 181.8 — — Asset Retirement Obligations 135.0 37.8 70.9 4.7 127.9 35.9 68.2 4.4 Other Regulatory Assets 296.5 23.5 96.3 9.0 322.5 26.2 114.0 14.4 Total Regulatory Assets 5,856.6 1,982.6 1,828.6 916.5 5,578.3 1,907.8 1,714.4 696.2 Less: Current Portion 1,507.9 383.7 638.5 177.1 1,335.5 314.1 492.8 102.2 Total Long-Term Regulatory Assets $ 4,348.7 $ 1,598.9 $ 1,190.1 $ 739.4 $ 4,242.8 $ 1,593.7 $ 1,221.6 $ 594.0 Regulatory Costs in Long-Term Assets: Eversource's regulated companies had $251.4 million (including $159.8 million for CL&P, $26.7 million for NSTAR Electric and $1.2 million for PSNH) and $210.8 million (including $135.9 million for CL&P, $19.8 million for NSTAR Electric and $1.0 million for PSNH) of additional regulatory costs as of September 30, 2023 and December 31, 2022, 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, 2023 and December 31, 2022, these regulatory costs included $85.6 million (including $65.6 million for CL&P and $9.6 million for NSTAR Electric) and $64.0 million (including $52.8 million for CL&P and $3.5 million for NSTAR Electric), respectively, of deferred uncollectible hardship costs. As of both September 30, 2023 and December 31, 2022, these regulatory costs also included incremental COVID-19 related non-tracked uncollectible expense deferred of $29.8 million at Eversource, $11.8 million at CL&P, and $2.2 million at NSTAR Electric. Regulatory Liabilities: The components of regulatory liabilities were as follows: As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH EDIT due to Tax Cuts and Jobs Act of 2017 $ 2,568.6 $ 973.4 $ 915.2 $ 341.6 $ 2,619.3 $ 983.6 $ 944.3 $ 348.6 Cost of Removal 680.8 154.9 418.3 16.0 670.6 130.8 405.3 14.7 Regulatory Tracking Mechanisms 740.5 205.4 345.2 108.4 890.8 361.0 336.1 155.0 Deferred Portion of Non-Service Income 333.4 46.1 166.8 34.7 270.9 34.5 139.7 28.8 AFUDC - Transmission 117.6 53.5 64.1 — 98.2 48.2 50.0 — Benefit Costs 43.9 0.5 21.4 — 55.4 0.7 31.4 — Other Regulatory Liabilities 261.4 30.4 72.6 4.9 215.9 40.6 14.5 6.5 Total Regulatory Liabilities 4,746.2 1,464.2 2,003.6 505.6 4,821.1 1,599.4 1,921.3 553.6 Less: Current Portion 724.4 155.9 416.0 114.6 890.8 336.0 373.2 162.0 Total Long-Term Regulatory Liabilities $ 4,021.8 $ 1,308.3 $ 1,587.6 $ 391.0 $ 3,930.3 $ 1,263.4 $ 1,548.1 $ 391.6 Regulatory Development: PSNH Pole Acquisition Approval: On November 18, 2022, the NHPUC issued a decision that approved a proposed purchase agreement between PSNH and Consolidated Communications, in which PSNH would acquire both jointly-owned and solely-owned poles and pole assets. The NHPUC also authorized PSNH to recover certain expenses associated with the operation and maintenance of the transferred poles, pole inspections, and vegetation management expenses through a new cost recovery mechanism, the Pole Plant Adjustment Mechanism (PPAM), subject to consummation of the purchase agreement. The purchase agreement was finalized on May 1, 2023 for a purchase price of $23.3 million. Upon consummation of the purchase agreement, PSNH established a regulatory asset of $16.9 million for operation and maintenance expenses and vegetation management expenses associated with the purchased poles incurred from February 10, 2021 through April 30, 2023 that PSNH is authorized to collect through the PPAM regulatory tracking mechanism. The establishment of the PPAM regulatory asset resulted in a pre-tax benefit recorded in Amortization expense on the PSNH statement of income in the second quarter of 2023.

PROPERTY, PLANT AND EQUIPMENT A

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 (Millions of Dollars) Distribution - Electric $ 19,238.3 $ 18,326.2 Distribution - Natural Gas 7,754.4 7,443.8 Transmission - Electric 14,233.1 13,709.3 Distribution - Water 2,203.6 2,112.6 Solar 200.8 200.8 Utility 43,630.2 41,792.7 Other (1) 1,959.2 1,738.1 Property, Plant and Equipment, Gross 45,589.4 43,530.8 Less: Accumulated Depreciation Utility (9,518.6) (9,167.4) Other (823.0) (706.1) Total Accumulated Depreciation (10,341.6) (9,873.5) Property, Plant and Equipment, Net 35,247.8 33,657.3 Construction Work in Progress 3,270.5 2,455.5 Total Property, Plant and Equipment, Net $ 38,518.3 $ 36,112.8 As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,717.0 $ 8,816.5 $ 2,745.1 $ 7,370.1 $ 8,410.0 $ 2,586.4 Transmission - Electric 6,345.8 5,536.6 2,352.4 6,165.1 5,333.8 2,212.0 Solar — 200.8 — — 200.8 — Property, Plant and Equipment, Gross 14,062.8 14,553.9 5,097.5 13,535.2 13,944.6 4,798.4 Less: Accumulated Depreciation (2,659.0) (3,535.5) (974.2) (2,567.1) (3,381.2) (912.3) Property, Plant and Equipment, Net 11,403.8 11,018.4 4,123.3 10,968.1 10,563.4 3,886.1 Construction Work in Progress 632.2 1,390.8 309.7 498.9 1,063.6 174.1 Total Property, Plant and Equipment, Net $ 12,036.0 $ 12,409.2 $ 4,433.0 $ 11,467.0 $ 11,627.0 $ 4,060.2 (1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS	9 Months Ended
	Sep. 30, 2023
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 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, 2023 As of December 31, 2022 CL&P (Millions of Dollars) Fair Value Hierarchy Commodity Supply and Price Risk Netting (1) Net Amount Commodity Supply and Price Risk Netting (1) Net Amount Current Derivative Assets Level 3 $ 16.9 $ (0.5) $ 16.4 $ 16.3 $ (0.5) $ 15.8 Long-Term Derivative Assets Level 3 17.0 (0.5) 16.5 28.8 (0.9) 27.9 Current Derivative Liabilities Level 3 (84.2) — (84.2) (81.6) — (81.6) Long-Term Derivative Liabilities Level 3 (85.3) — (85.3) (143.9) — (143.9) (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, 2023 and December 31, 2022 were 674 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. Fair Value Measurements of Derivative Instruments The fair value of derivative contracts classified as Level 3 utilizes both significant observable and unobservable inputs. The fair value is modeled using income techniques, such as discounted cash flow valuations adjusted for assumptions related to exit price. 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. Significant observable inputs for valuations of these contracts include energy-related product prices in future years for which quoted prices in an active market exist. 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. Fair value measurements categorized in Level 3 of the fair value hierarchy are prepared by individuals with expertise in valuation techniques, pricing of energy-related products, and accounting requirements. Exit price premiums of 1.3 percent through 5.5 percent, or a weighted average of 4.5 percent, are Level 3 significant unobservable inputs 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. As of December 31, 2022, Level 3 unobservable inputs also utilized in the valuation of CL&P’s capacity-related related contracts included forward reserve prices of $0.44 per kW-Month through $0.50 per kW-Month, or a weighted average of $0.47 per kW-Month, over the period 2023 through 2024. As of September 30, 2023, these forward reserve prices are now observable. 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) 2023 2022 2023 2022 Derivatives, Net: Fair Value as of Beginning of Period $ (152.1) $ (213.3) $ (181.8) $ (249.2) Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets (1.5) 2.4 (1.6) 11.2 Settlements 17.0 15.0 46.8 42.1 Fair Value as of End of Period $ (136.6) $ (195.9) $ (136.6) $ (195.9)

MARKETABLE SECURITIES

MARKETABLE SECURITIES	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIESEversource’s marketable securities include the CYAPC and YAEC legally restricted trusts that each hold equity and available-for-sale debt securities to fund the spent nuclear fuel removal obligations of their nuclear fuel storage facilities. Eversource also holds trusts that are not subject to regulatory oversight by state or federal agencies that are primarily used to fund certain non-qualified executive benefits. The marketable securities within these non-qualified executive benefit trusts were sold in 2023. Equity and available-for-sale debt marketable securities are recorded at fair value, with the current portion recorded in Prepayments and Other Current Assets and the long-term portion recorded in Marketable Securities on the balance sheets. 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 December 31, 2022 was $20.0 million. These equity securities were sold during 2023 and resulted in a $1.1 million gain recorded in Other Income, Net for the nine months ended September 30, 2023. For the three and nine months ended September 30, 2022, there was $1.5 million and $10.6 million of unrealized losses, respectively, recorded in Other Income, Net that related to equity securities still held at the reporting date. Eversource's equity securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $168.3 million and $170.1 million as of September 30, 2023 and December 31, 2022, 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 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: As of September 30, 2023 As of December 31, 2022 Eversource (Millions of Dollars) Amortized Cost Pre-Tax Pre-Tax Fair Value Amortized Cost Pre-Tax Pre-Tax Fair Value Debt Securities $ 173.0 $ 0.3 $ (11.0) $ 162.3 $ 201.6 $ 0.1 $ (16.2) $ 185.5 Unrealized gains and losses on available-for-sale debt securities held in Eversource's non-qualified executive 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 was $1.2 million of realized losses recorded on securities sold for the nine months ended September 30, 2023 that were reclassified out of Accumulated Other Comprehensive Income and recorded in Other Income, Net. There have been no credit losses for the three and nine months ended September 30, 2023 and 2022, and no allowance for credit losses as of September 30, 2023. 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. Eversource's debt securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts in the amounts of $162.2 million and $163.2 million as of September 30, 2023 and December 31, 2022, respectively. Unrealized gains and losses for available-for-sale debt securities included in the CYAPC and YAEC spent nuclear fuel trusts are subject to regulatory accounting treatment and are recorded in Marketable Securities with the corresponding offset to long-term liabilities on the balance sheets, with no impact on the statements of income. Pre-tax unrealized gains and losses as of September 30, 2023 and December 31, 2022 primarily relate to the debt securities included in CYAPC's and YAEC's spent nuclear fuel trusts. As of September 30, 2023, 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) $ 19.0 $ 19.4 One to five years 29.9 29.2 Six to ten years 41.7 39.9 Greater than ten years 82.4 73.8 Total Debt Securities $ 173.0 $ 162.3 (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 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, 2023 As of December 31, 2022 Level 1: Mutual Funds and Equities $ 168.3 $ 190.1 Money Market Funds 16.2 25.4 Total Level 1 $ 184.5 $ 215.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 86.1 $ 82.3 Corporate Debt Securities 34.1 46.1 Asset-Backed Debt Securities 5.9 8.6 Municipal Bonds 9.3 12.7 Other Fixed Income Securities 10.7 10.4 Total Level 2 $ 146.1 $ 160.1 Total Marketable Securities $ 330.6 $ 375.6 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.

SHORT-TERM AND LONG-TERM DEBT

SHORT-TERM AND LONG-TERM DEBT	9 Months Ended
	Sep. 30, 2023
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 13, 2028. 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 13, 2028, and 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, 2023 December 31, 2022 September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 1,320.3 $ 1,442.2 $ 679.7 $ 557.8 5.53 % 4.63 % NSTAR Electric Commercial Paper Program 209.5 — 440.5 650.0 5.35 % — % There were no borrowings outstanding on the revolving credit facilities as of September 30, 2023 or December 31, 2022. CL&P and PSNH have uncommitted line of credit agreements totaling $375 million and $250 million, respectively, which will expire in 2024. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of September 30, 2023. 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. 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, 2023, there were intercompany loans from Eversource parent to CL&P of $213.4 million and to PSNH of $0.1 million. As of December 31, 2022, there were intercompany loans from Eversource parent to PSNH of $173.3 million. Eversource parent charges interest on these intercompany loans at the same weighted-average interest rate as its commercial paper program. 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, as these intercompany borrowings are outstanding for no more than 364 days at one time. Sources and Uses of Cash: 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. Availability under Long-Term Debt Issuance Authorizations: On June 7, 2023, PURA approved Yankee Gas’ request for authorization to issue up to $350 million in long-term debt through December 31, 2024. Long-Term Debt Issuances and Repayments: The following table summarizes long-term debt issuances and repayments: (Millions of Dollars) Interest Rate Issuance/(Repayment) Issue Date or Repayment Date Maturity Date Use of Proceeds for Issuance/ CL&P 2023 Series A First Mortgage Bonds 5.25 % $ 500.0 January 2023 January 2053 Repaid 2013 Series A Bonds at maturity and short-term debt, and paid capital expenditures and working capital CL&P 2013 Series A First Mortgage Bonds 2.50 % (400.0) January 2023 January 2023 Paid at maturity CL&P 2023 Series B First Mortgage Bonds 4.90 % 300.0 July 2023 July 2033 Repaid short-term debt, paid capital expenditures and working capital NSTAR Electric 2023 Debentures 5.60 % 150.0 September 2023 October 2028 Repay Series G Senior Notes at maturity and short-term debt and for general corporate purposes PSNH Series W First Mortgage Bonds 5.15 % 300.0 January 2023 January 2053 Repaid short-term debt, paid capital expenditures and working capital PSNH Series X First Mortgage Bonds 5.35 % 300.0 September 2023 October 2033 Repaid Series S Bonds at maturity and for general corporate purposes PSNH Series S First Mortgage Bonds 3.50 % (325.0) November 2023 November 2023 Paid at maturity Eversource Parent Series Z Senior Notes 5.45 % 750.0 March 2023 March 2028 Repaid Series F Senior Notes at maturity and short-term debt Eversource Parent Series F Senior Notes 2.80 % (450.0) May 2023 May 2023 Paid at maturity Eversource Parent Series Z Senior Notes 5.45 % 550.0 May 2023 March 2028 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Series AA Senior Notes 4.75 % 450.0 May 2023 May 2026 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Series BB Senior Notes 5.125 % 800.0 May 2023 May 2033 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Variable Rate Series T Senior Notes SOFR plus 0.25% (350.0) August 2023 August 2023 Paid at maturity Yankee Gas Series V First Mortgage Bonds 5.51 % 170.0 August 2023 August 2030 Repaid short-term debt and general corporate purposes Aquarion Water Company of Connecticut Senior Notes 5.89 % 50.0 September 2023 October 2043 Repaid existing indebtedness, paid capital expenditures and general corporate purposes

RATE REDUCTION BONDS AND VARIAB

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 Restricted Cash - Current Portion (included in Current Assets) $ 16.6 $ 32.4 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 403.3 435.7 Other Regulatory Liabilities (included in Regulatory Liabilities) 6.7 6.0 Accrued Interest (included in Other Current Liabilities) 2.5 6.9 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 367.3 410.5 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended For the Nine Months Ended September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 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) 3.9 4.2 11.9 12.9

PENSION BENEFITS AND POSTRETIRE

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION	9 Months Ended
	Sep. 30, 2023
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/(liabilities) for future recovery or refund, 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, 2023 For the Three Months Ended September 30, 2023 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Service Cost $ 10.7 $ 3.1 $ 1.9 $ 1.0 $ 1.9 $ 0.4 $ 0.3 $ 0.2 Interest Cost 63.4 12.6 13.5 6.8 8.5 1.5 2.3 0.9 Expected Return on Plan Assets (116.3) (23.5) (28.4) (12.3) (19.3) (2.3) (9.2) (1.4) Actuarial Loss 10.9 0.5 4.0 0.4 — — — — Prior Service Cost/(Credit) 0.3 — 0.1 — (5.4) 0.2 (4.2) 0.1 Settlement Loss 8.7 — — — — — — — Total Net Periodic Benefit Plan Income $ (22.3) $ (7.3) $ (8.9) $ (4.1) $ (14.3) $ (0.2) $ (10.8) $ (0.2) Intercompany Expense/(Income) Allocations N/A $ 0.8 $ 0.9 $ 0.3 N/A $ (0.5) $ (0.5) $ (0.2) Pension and SERP PBOP For the Nine Months Ended September 30, 2023 For the Nine Months Ended September 30, 2023 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 32.4 $ 9.2 $ 5.9 $ 3.2 $ 5.7 $ 1.0 $ 0.9 $ 0.6 Interest Cost 190.6 37.9 40.5 20.4 25.4 4.6 6.9 2.7 Expected Return on Plan Assets (348.7) (70.6) (85.3) (37.1) (57.9) (7.0) (27.7) (4.2) Actuarial Loss 35.0 1.9 12.9 1.2 — — — — Prior Service Cost/(Credit) 0.9 — 0.3 — (16.2) 0.8 (12.7) 0.3 Settlement Loss 12.4 — — — — — — — Total Net Periodic Benefit Plan Income $ (77.4) $ (21.6) $ (25.7) $ (12.3) $ (43.0) $ (0.6) $ (32.6) $ (0.6) Intercompany Income Allocations N/A $ (1.8) $ (1.2) $ (0.3) N/A $ (1.4) $ (1.6) $ (0.5) Pension and SERP PBOP For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 17.5 $ 4.7 $ 3.4 $ 1.7 $ 2.9 $ 0.5 $ 0.5 $ 0.3 Interest Cost 38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (130.7) (26.5) (32.1) (14.0) (22.5) (2.8) (10.6) (1.7) Actuarial Loss 28.4 4.0 8.1 1.9 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (45.8) $ (10.0) $ (12.3) $ (6.2) $ (20.0) $ (1.1) $ (13.0) $ (0.8) Intercompany Income Allocations N/A $ (4.0) $ (3.2) $ (1.0) N/A $ (0.9) $ (0.9) $ (0.3) Pension and SERP PBOP For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 52.7 $ 13.9 $ 10.4 $ 5.2 $ 8.7 $ 1.5 $ 1.5 $ 0.8 Interest Cost 115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 Expected Return on Plan Assets (393.1) (79.6) (96.2) (42.1) (67.5) (8.4) (31.8) (5.0) Actuarial Loss 87.5 12.2 24.7 6.0 — — — — Prior Service Cost/(Credit) 1.1 — 0.3 — (16.2) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Income $ (136.0) $ (30.1) $ (36.3) $ (18.3) $ (59.9) $ (3.4) $ (39.1) $ (2.3) Intercompany Income Allocations N/A $ (11.9) $ (9.3) $ (2.7) N/A $ (2.7) $ (2.7) $ (0.9)

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 Number of Sites Reserve Number of Sites Reserve Eversource 63 $ 130.5 59 $ 122.6 CL&P 14 12.6 13 13.9 NSTAR Electric 12 5.4 10 3.4 PSNH 8 7.7 8 6.1 The increase in the reserve balance was due primarily to the addition of one environmental site at NSTAR Gas, two additional environmental sites at NSTAR Electric, and changes in cost estimates at certain MGP sites at our natural gas companies and PSNH for which additional remediation will be 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 $120.5 million and $112.6 million as of September 30, 2023 and December 31, 2022, 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. 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 were $4.4 million and $4.2 million as of September 30, 2023 and December 31, 2022, respectively. The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties, and primarily relates to its offshore wind business: As of September 30, 2023 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore Construction-related purchase agreements with third-party contractors (1) $ 705.8 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 823.3 2025 - 2028 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 381.1 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 55.5 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of South Fork Wind (5) 77.4 (5) South Fork Class B Member, LLC Funding and indemnification obligations of South Fork Wind (6) 77.4 (6) Eversource Investment LLC Funding and indemnification obligations of North East Offshore (7) 29.8 (7) South Fork Wind, LLC Power Purchase Agreement Security (8) 7.1 (8) Sunrise Wind LLC OREC capacity production (9) 11.0 (9) Bay State Wind LLC Real estate purchase 2.5 2024 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (10) 15.2 — Eversource TEI LLC South Fork Wind Tax Equity (11) — (11) Various Surety bonds (12) 38.8 2023 - 2024 Eversource Service Lease payments for real estate 0.3 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, 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 and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 7, below. (2) Eversource parent issued guarantees 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 $1.06 billion, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and October 2028 and (ii) full performance of the guaranteed obligations. (3) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $546.4 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations. (4) Eversource parent issued 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 construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $161.0 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from October 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary Eversource Investment LLC (EI), which holds Eversource's investments in offshore wind-related equity method investments, whereby Eversource parent will guarantee EI’s performance of certain obligations, in an amount not to exceed $110.0 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (6) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee South Fork Class B Member, LLC’s performance of certain obligations, in an amount not to exceed $499.5 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (7) Eversource parent issued a guarantee (Funding Guarantee) on behalf of EI, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the operating agreement of NEO, in an 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. (8) Eversource parent issued a guarantee 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 an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guaranteed obligations. (9) 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 amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed 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. (10) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, 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. In January 2022, EI issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million. In June 2023, EI issued a letter of credit on behalf of Sunrise Wind LLC related to future environmental remediation in the amount of $9.9 million. In September 2023, EI issued a letter of credit on behalf of Revolution Wind, LLC related to onshore transmission construction in the amount of $1.0 million. (11) Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary, Eversource TEI LLC, whereby Eversource parent will guarantee Eversource TEI LLC’s performance of certain obligations, in an amount not to exceed $528.4 million, primarily in connection with tax equity funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (12) 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. C. 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 resulting from the DOE's failure to begin accepting spent nuclear fuel for disposal covering the years from 2017 to 2020. The Yankee Companies filed claims seeking monetary damages totaling $120.4 million for CYAPC, YAEC and MYAPC. Pursuant to a June 2, 2022 court order, the Yankee Companies were subsequently permitted to include monetary damages relating to the year 2021 in the DOE Phase V complaint. The Yankee Companies submitted a supplemental filing to include these costs of $33.1 million on June 8, 2022. The DOE Phase V trial is now expected to begin in 2024. D. 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, FERC issued Opinion No. 531-A and 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 both September 30, 2023 and December 31, 2022. 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 both September 30, 2023 and December 31, 2022. 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. 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. FERC Opinion Nos. 569-A and 569-B were appealed to the Court. On August 9, 2022, the Court issued its decision vacating MISO ROE FERC Opinion Nos. 569, 569-A and 569-B and remanded to FERC to reopen the proceedings. The Court found that FERC’s development of the new return methodology was arbitrary and capricious due to FERC’s failure to offer a reasonable explanation for its decision to reintroduce the risk-premium financial model in its new methodology for calculating a just and reasonable return. At this time, Eversource cannot predict how and when FERC will address the Court’s findings on the remand of the MISO FERC opinions or any potential associated impact on the NETOs’ four pending ROE complaint 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 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.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	9 Months Ended
	Sep. 30, 2023
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 Fair Carrying Fair Carrying Fair Carrying Fair As of September 30, 2023: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 118.0 $ 116.2 $ 87.2 $ 43.0 $ 30.8 $ — $ — Long-Term Debt 24,159.1 21,260.5 4,606.8 4,025.3 4,576.5 4,071.1 1,756.6 1,483.4 Rate Reduction Bonds 410.5 381.6 — — — — 410.5 381.6 As of December 31, 2022: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 136.7 $ 116.2 $ 99.2 $ 43.0 $ 37.5 $ — $ — Long-Term Debt 21,044.1 18,891.3 4,216.5 3,828.3 4,425.1 4,091.8 1,164.6 970.5 Rate Reduction Bonds 453.7 424.7 — — — — 453.7 424.7 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 1C, "Summary of Significant Accounting Policies – Fair Value Measurements," for the fair value measurement policy and the fair value hierarchy.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)	9 Months Ended
	Sep. 30, 2023
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, 2023 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Qualified Unrealized Defined Total Qualified Unrealized Defined Total Balance as of Beginning of Period $ (0.4) $ (1.2) $ (37.8) $ (39.4) $ (0.4) $ 0.4 $ (42.3) $ (42.3) OCI Before Reclassifications — — 0.1 0.1 — (2.0) (2.5) (4.5) Amounts Reclassified from AOCI — 1.2 14.1 15.3 — — 5.8 5.8 Net OCI — 1.2 14.2 15.4 — (2.0) 3.3 1.3 Balance as of End of Period $ (0.4) $ — $ (23.6) $ (24.0) $ (0.4) $ (1.6) $ (39.0) $ (41.0) 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. Defined benefit plan amounts reclassified from AOCI also include a settlement loss amortized into net periodic benefit plan expense/(income) for the nine months ended September 30, 2023. See Note 8, "Pension Benefits and Postretirement Benefits Other Than Pension," for further information.

COMMON SHARES

COMMON SHARES	9 Months Ended
	Sep. 30, 2023
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 Issued as of Par Value September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Eversource $ 5 410,000,000 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 100,000,000 200 200 PSNH $ 1 100,000,000 100,000,000 301 301 Treasury Shares: As of September 30, 2023 and December 31, 2022, there were 10,708,298 and 11,540,218 Eversource common shares held as treasury shares, respectively. As of September 30, 2023 and December 31, 2022, there we re 349,275,775 and 348,443,855 Eversource common shares outstanding, 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. Eversource also issued treasury shares for its October 2022 water business acquisition. 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. On May 3, 2023, shareholders voted to increase the authorized common shares from 380,000,000 shares to 410,000,000 shares.

COMMON SHAREHOLDERS' EQUITY AND

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS	9 Months Ended
	Sep. 30, 2023
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 Issued as of Par Value September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Eversource $ 5 410,000,000 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 100,000,000 200 200 PSNH $ 1 100,000,000 100,000,000 301 301 Treasury Shares: As of September 30, 2023 and December 31, 2022, there were 10,708,298 and 11,540,218 Eversource common shares held as treasury shares, respectively. As of September 30, 2023 and December 31, 2022, there we re 349,275,775 and 348,443,855 Eversource common shares outstanding, 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. Eversource also issued treasury shares for its October 2022 water business acquisition. 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. On May 3, 2023, shareholders voted to increase the authorized common shares from 380,000,000 shares to 410,000,000 shares.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
EARNINGS PER SHARE	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. For the three and nine months ended September 30, 2023 and 2022, there were no antidilutive share awards excluded from the computation of 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, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Net Income Attributable to Common Shareholders $ 339.7 $ 349.4 $ 846.2 $ 1,084.7 Weighted Average Common Shares Outstanding: Basic 349,704,155 347,297,411 349,461,219 346,115,823 Dilutive Effect 147,814 465,282 270,101 457,278 Diluted 349,851,969 347,762,693 349,731,320 346,573,101 Basic EPS $ 0.97 $ 1.01 $ 2.42 $ 3.13 Diluted EPS $ 0.97 $ 1.00 $ 2.42 $ 3.13

REVENUES

REVENUES	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
REVENUES	REVENUES The following tables present operating revenues disaggregated by revenue source: For the Three Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,375.9 $ 83.0 $ — $ 44.7 $ — $ — $ 1,503.6 Commercial 764.1 33.7 — 19.6 — (1.1) 816.3 Industrial 94.5 30.2 — 1.2 — (4.8) 121.1 Total Retail Tariff Sales Revenues 2,234.5 146.9 — 65.5 — (5.9) 2,441.0 Wholesale Transmission Revenues — — 520.2 — — (386.6) 133.6 Wholesale Market Sales Revenues 154.9 71.6 — 1.1 — — 227.6 Other Revenues from Contracts with Customers 20.9 1.3 4.8 2.0 394.7 (392.4) 31.3 Total Revenues from Contracts with Customers 2,410.3 219.8 525.0 68.6 394.7 (784.9) 2,833.5 Alternative Revenue Programs (43.8) (2.4) (33.6) (0.3) — 31.9 (48.2) Other Revenues 4.8 0.9 0.2 0.3 — — 6.2 Total Operating Revenues $ 2,371.3 $ 218.3 $ 491.6 $ 68.6 $ 394.7 $ (753.0) $ 2,791.5 For the Nine Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,982.1 $ 858.0 $ — $ 112.6 $ — $ — $ 4,952.7 Commercial 2,244.7 483.6 — 53.2 — (3.4) 2,778.1 Industrial 268.5 141.7 — 3.4 — (14.6) 399.0 Total Retail Tariff Sales Revenues 6,495.3 1,483.3 — 169.2 — (18.0) 8,129.8 Wholesale Transmission Revenues — — 1,358.2 — — (1,015.6) 342.6 Wholesale Market Sales Revenues 484.4 160.5 — 2.9 — — 647.8 Other Revenues from Contracts with Customers 60.1 3.9 14.1 6.1 1,217.3 (1,210.7) 90.8 Total Revenues from Contracts with Customers 7,039.8 1,647.7 1,372.3 178.2 1,217.3 (2,244.3) 9,211.0 Alternative Revenue Programs (40.7) 21.9 57.6 (2.0) — (50.8) (14.0) Other Revenues 15.2 3.0 0.5 0.8 — — 19.5 Total Operating Revenues $ 7,014.3 $ 1,672.6 $ 1,430.4 $ 177.0 $ 1,217.3 $ (2,295.1) $ 9,216.5 For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,492.9 $ 94.7 $ — $ 45.7 $ — $ — $ 1,633.3 Commercial 890.5 76.7 — 18.5 — (1.7) 984.0 Industrial 105.6 33.6 — 1.3 — (5.2) 135.3 Total Retail Tariff Sales Revenues 2,489.0 205.0 — 65.5 — (6.9) 2,752.6 Wholesale Transmission Revenues — — 520.3 — 29.9 (416.3) 133.9 Wholesale Market Sales Revenues 317.1 22.7 — 1.1 — — 340.9 Other Revenues from Contracts with Customers 17.3 0.6 3.4 2.1 313.6 (311.9) 25.1 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (0.1) — — 6.9 Total Revenues from Contracts with Customers 2,830.4 228.3 523.7 68.6 343.5 (735.1) 3,259.4 Alternative Revenue Programs (37.7) (2.8) (55.1) (3.6) — 52.6 (46.6) Other Revenues 2.4 0.1 0.2 0.1 — — 2.8 Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,683.9 $ 870.0 $ — $ 109.1 $ — $ — $ 4,663.0 Commercial 2,216.0 456.9 — 49.9 — (4.2) 2,718.6 Industrial 284.1 145.2 — 3.5 — (14.8) 418.0 Total Retail Tariff Sales Revenues 6,184.0 1,472.1 — 162.5 — (19.0) 7,799.6 Wholesale Transmission Revenues — — 1,301.0 — 79.4 (1,047.3) 333.1 Wholesale Market Sales Revenues 895.2 89.3 — 2.8 — — 987.3 Other Revenues from Contracts with Customers 53.4 2.8 10.5 6.2 983.3 (974.9) 81.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 71.9 — 0.7 (0.9) — — 71.7 Total Revenues from Contracts with Customers 7,204.5 1,564.2 1,312.2 170.6 1,062.7 (2,041.2) 9,273.0 Alternative Revenue Programs (26.2) 4.3 48.9 (2.8) — (46.9) (22.7) Other Revenues 7.5 0.9 0.5 0.4 — — 9.3 Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 For the Three Months Ended September 30, 2023 For the Three Months Ended September 30, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 703.9 $ 480.5 $ 191.5 $ 739.1 $ 507.6 $ 246.2 Commercial 286.4 389.4 88.7 311.2 469.6 110.4 Industrial 39.0 31.9 23.6 41.9 39.3 24.4 Total Retail Tariff Sales Revenues 1,029.3 901.8 303.8 1,092.2 1,016.5 381.0 Wholesale Transmission Revenues 245.1 186.4 88.7 250.3 183.8 86.2 Wholesale Market Sales Revenues 112.8 28.6 13.5 232.9 57.5 26.7 Other Revenues from Contracts with Customers 7.7 12.4 5.0 7.5 10.7 3.1 Amortization of Revenues Subject to Refund (1) 1.3 — — 7.0 — — Total Revenues from Contracts with Customers 1,396.2 1,129.2 411.0 1,589.9 1,268.5 497.0 Alternative Revenue Programs (49.3) (29.0) 0.9 (65.1) (20.5) (7.2) Other Revenues 2.4 1.9 0.7 0.2 1.8 0.6 Eliminations (159.2) (148.6) (59.5) (155.9) (144.3) (59.8) Total Operating Revenues $ 1,190.1 $ 953.5 $ 353.1 $ 1,369.1 $ 1,105.5 $ 430.6 For the Nine Months Ended September 30, 2023 For the Nine Months Ended September 30, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 2,059.9 $ 1,318.7 $ 603.5 $ 1,864.4 $ 1,239.0 $ 580.5 Commercial 836.7 1,121.0 287.5 808.7 1,128.8 280.5 Industrial 104.1 95.7 68.7 111.4 104.0 68.7 Total Retail Tariff Sales Revenues 3,000.7 2,535.4 959.7 2,784.5 2,471.8 929.7 Wholesale Transmission Revenues 613.3 521.0 223.9 575.2 512.7 213.1 Wholesale Market Sales Revenues 330.4 102.1 51.9 656.3 163.1 75.8 Other Revenues from Contracts with Customers 24.7 36.0 12.2 22.8 34.1 8.8 Amortization of Revenues Subject to Refund (1) 3.1 — — 72.6 — — Total Revenues from Contracts with Customers 3,972.2 3,194.5 1,247.7 4,111.4 3,181.7 1,227.4 Alternative Revenue Programs 28.0 (43.5) 32.4 28.3 (14.4) 8.8 Other Revenues 7.1 6.3 2.3 0.5 5.4 2.1 Eliminations (444.1) (428.5) (159.1) (449.6) (420.4) (161.2) Total Operating Revenues $ 3,563.2 $ 2,728.8 $ 1,123.3 $ 3,690.6 $ 2,752.3 $ 1,077.1 (1) Amortization of/(Reserve for) Revenues Subject to Refund within the Electric Distribution segment in the third quarter and the first nine months of 2022 primarily represents the reversal of a 2021 reserve at CL&P established to provide bill credits to customers as a result of the settlement agreement on October 1, 2021 and a storm performance penalty assessed by PURA. The reserve was reversed as customer credits were distributed to CL&P’s customers in retail electric rates. Total customer credits as a result of the 2021 settlement and civil penalty were $93.4 million. The settlement amount of $65 million was refunded over a two-month billing period from December 1, 2021 to January 31, 2022 and the civil penalty of $28.4 million was refunded over a one year billing period, which began September 1, 2021.

SEGMENT INFORMATION

SEGMENT INFORMATION	9 Months Ended
	Sep. 30, 2023
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 that was liquidated in the first quarter of 2023. 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, Purchased Natural Gas 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 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 income/expense. Eversource's segment information is as follows: For the Three Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,371.3 $ 218.3 $ 491.6 $ 68.6 $ 394.7 $ (753.0) $ 2,791.5 Depreciation and Amortization (0.7) (38.0) (94.5) (13.9) (40.7) 2.3 (185.5) Other Operating Expenses (2,124.0) (211.1) (144.9) (30.9) (315.7) 751.2 (2,075.4) Operating Income/(Loss) $ 246.6 $ (30.8) $ 252.2 $ 23.8 $ 38.3 $ 0.5 $ 530.6 Interest Expense $ (76.8) $ (19.7) $ (43.0) $ (9.8) $ (111.4) $ 38.4 $ (222.3) Other Income, Net 53.5 9.2 11.9 1.3 415.9 (412.7) 79.1 Net Income/(Loss) Attributable to Common 173.3 (33.7) 160.3 16.6 397.0 (373.8) 339.7 For the Nine Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 7,014.3 $ 1,672.6 $ 1,430.4 $ 177.0 $ 1,217.3 $ (2,295.1) $ 9,216.5 Depreciation and Amortization 59.3 (156.7) (276.4) (41.3) (115.5) 6.6 (524.0) Other Operating Expenses (6,371.4) (1,280.8) (409.4) (87.5) (992.6) 2,290.0 (6,851.7) Operating Income $ 702.2 $ 235.1 $ 744.6 $ 48.2 $ 109.2 $ 1.5 $ 1,840.8 Interest Expense $ (214.4) $ (62.4) $ (126.7) $ (28.4) $ (297.0) $ 104.8 $ (624.1) Impairment of Offshore Wind Investment — — — — (401.0) — (401.0) Other Income, Net 155.7 27.9 30.8 4.0 1,082.6 (1,038.0) 263.0 Net Income Attributable to Common Shareholders 504.3 148.2 476.4 27.4 621.6 (931.7) 846.2 Cash Flows Used for Investments in Plant 1,230.3 536.8 1,011.3 140.1 207.1 — 3,125.6 For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 Depreciation and Amortization (256.9) (25.1) (85.1) (12.7) (35.4) 1.8 (413.4) Other Operating Expenses (2,261.5) (226.3) (143.7) (28.8) (265.7) 681.1 (2,244.9) Operating Income/(Loss) $ 276.7 $ (25.8) $ 240.0 $ 23.6 $ 42.4 $ 0.4 $ 557.3 Interest Expense $ (64.5) $ (18.8) $ (36.6) $ (8.7) $ (69.6) $ 20.0 $ (178.2) Other Income, Net 59.6 11.1 10.1 2.1 429.9 (423.0) 89.8 Net Income/(Loss) Attributable to Common 225.1 (24.6) 155.8 16.7 379.0 (402.6) 349.4 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 Depreciation and Amortization (806.7) (116.2) (250.3) (37.5) (98.8) 5.1 (1,304.4) Other Operating Expenses (5,743.2) (1,244.3) (414.3) (82.9) (876.5) 2,081.9 (6,279.3) Operating Income $ 635.9 $ 208.9 $ 697.0 $ 47.8 $ 87.4 $ (1.1) $ 1,675.9 Interest Expense $ (184.2) $ (51.2) $ (107.3) $ (25.2) $ (169.9) $ 46.3 $ (491.5) Other Income, Net 160.1 31.9 28.3 6.4 1,280.1 (1,251.5) 255.3 Net Income Attributable to Common Shareholders 495.0 147.2 455.8 29.4 1,163.6 (1,206.3) 1,084.7 Cash Flows Used for Investments in Plant 823.9 424.5 823.3 103.4 177.6 — 2,352.7 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of September 30, 2023 $ 28,840.9 $ 8,404.5 $ 14,693.4 $ 2,885.1 $ 29,019.0 $ (27,549.6) $ 56,293.3 As of December 31, 2022 27,365.0 8,084.9 13,369.5 2,783.8 26,365.2 (24,737.5) 53,230.9

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Pay vs Performance Disclosure
Net Income	$ 341,543	$ 17,302	$ 493,039	$ 351,289	$ 293,742	$ 445,326

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2023
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 EGMA (natural gas utilities), and Aquarion (water utilities). Eversource provides energy delivery and/or water service to approximately 4.4 million electric, natural gas and water customers through twelve 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 2022 Form 10-K, which was filed with the SEC on February 15, 2023. 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, 2023 and December 31, 2022, and the results of operations, comprehensive income and common shareholders' equity for the three and nine months ended September 30, 2023 and 2022, and the cash flows for the nine months ended September 30, 2023 and 2022. The results of operations and comprehensive income for the three and nine months ended September 30, 2023 and 2022 and the cash flows for the nine months ended September 30, 2023 and 2022 are not necessarily indicative of the results expected for a full year. CYAPC and YAEC are inactive regional nuclear power companies engaged in the long-term storage of their spent nuclear fuel. Eversource consolidates the operations of 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. Certain reclassifications of prior period data were made in the accompanying financial statements to conform to the current period presentation.
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). 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 an aging-based quantitative assessment that applies an estimated uncollectible percentage to each receivable aging category. Factors in determining credit loss include historical collection, write-off experience, analysis of delinquency statistics, and management's assessment of collectability from customers, including current economic conditions, customer payment trends, the impact on customer bills because of energy usage trends and changes in rates, flexible payment plans and financial hardship arrearage management programs being offered to customers, 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 conditions, 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. Management concluded that the reserve balance as of September 30, 2023 adequately reflected the collection risk and net realizable value for its receivables. As of both September 30, 2023 and December 31, 2022, the total amount incurred as a result of COVID-19 included in the allowance for uncollectible accounts was $50.9 million at Eversource, $16.0 million at CL&P, and $4.1 million at NSTAR Electric. At our Connecticut and Massachusetts utilities, the COVID-19 related uncollectible amounts were deferred either as incremental regulatory costs 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. No COVID-19 related uncollectible amounts were deferred at PSNH as a result of a July 2021 NHPUC order. Based on the status of our COVID-19 regulatory dockets, policies and practices in the jurisdictions in which we operate, we believe the state regulatory commissions in Connecticut and Massachusetts will allow us to recover our incremental uncollectible customer receivable costs associated with COVID-19. 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.
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 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, AROs, and in the valuation of business combinations and asset acquisitions. 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.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Allowance for Uncollectible Accounts	The activity in the allowance for uncollectible accounts by portfolio segment as of September 30 th is as follows: Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance (2) Three Months Ended 2023 Beginning Balance $ 338.2 $ 194.2 $ 532.4 $ 226.5 $ 36.3 $ 262.8 $ 45.6 $ 52.2 $ 97.8 $ 12.7 Uncollectible Expense — 16.8 16.8 — 2.4 2.4 — 5.2 5.2 2.0 Uncollectible Costs Deferred (1) 33.9 14.0 47.9 29.4 3.1 32.5 3.4 4.5 7.9 1.1 Write-Offs (17.5) (40.4) (57.9) (14.9) (7.6) (22.5) 0.1 (11.5) (11.4) (3.6) Recoveries Collected 0.2 3.3 3.5 0.2 0.9 1.1 — 1.3 1.3 0.2 Ending Balance $ 354.8 $ 187.9 $ 542.7 $ 241.2 $ 35.1 $ 276.3 $ 49.1 $ 51.7 $ 100.8 $ 12.4 Nine Months Ended 2023 Beginning Balance $ 284.4 $ 201.9 $ 486.3 $ 188.9 $ 36.4 $ 225.3 $ 43.7 $ 51.3 $ 95.0 $ 29.2 Uncollectible Expense — 40.9 40.9 — 7.1 7.1 — 13.0 13.0 1.5 Uncollectible Costs Deferred (1) 104.7 22.8 127.5 80.3 9.3 89.6 5.8 13.8 19.6 (11.1) Write-Offs (35.3) (88.5) (123.8) (29.0) (21.3) (50.3) (0.4) (30.4) (30.8) (7.8) Recoveries Collected 1.0 10.8 11.8 1.0 3.6 4.6 — 4.0 4.0 0.6 Ending Balance $ 354.8 $ 187.9 $ 542.7 $ 241.2 $ 35.1 $ 276.3 $ 49.1 $ 51.7 $ 100.8 $ 12.4 Eversource CL&P NSTAR Electric PSNH (Millions of Dollars) Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Hardship Accounts Retail (Non-Hardship), Total Allowance Total Allowance Three Months Ended 2022 Beginning Balance $ 242.7 $ 215.1 $ 457.8 $ 152.1 $ 40.6 $ 192.7 $ 45.0 $ 55.5 $ 100.5 $ 27.3 Uncollectible Expense — 10.7 10.7 — 4.1 4.1 — 3.5 3.5 3.5 Uncollectible Costs Deferred (1) 15.6 9.4 25.0 11.3 2.0 13.3 2.8 4.0 6.8 0.1 Write-Offs (6.5) (33.2) (39.7) (5.0) (7.7) (12.7) (0.3) (12.3) (12.6) (2.3) Recoveries Collected 0.3 3.5 3.8 0.2 1.0 1.2 — 1.3 1.3 0.2 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 Nine Months Ended 2022 Beginning Balance $ 226.1 $ 191.3 $ 417.4 $ 144.6 $ 36.7 $ 181.3 $ 43.3 $ 53.7 $ 97.0 $ 24.3 Uncollectible Expense — 40.8 40.8 — 10.8 10.8 — 12.2 12.2 8.1 Uncollectible Costs Deferred (1) 38.0 36.7 74.7 22.3 2.0 24.3 4.9 11.8 16.7 1.2 Write-Offs (13.5) (76.3) (89.8) (9.4) (14.4) (23.8) (0.7) (30.6) (31.3) (5.4) Recoveries Collected 1.5 13.0 14.5 1.1 4.9 6.0 — 4.9 4.9 0.6 Ending Balance $ 252.1 $ 205.5 $ 457.6 $ 158.6 $ 40.0 $ 198.6 $ 47.5 $ 52.0 $ 99.5 $ 28.8 (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 uncollectible energy supply costs and COVID-19. The increase in the allowance for uncollectible hardship accounts in 2023 at Eversource and CL&P primarily relates to increased customer enrollment in disconnection prevention programs in Connecticut. (2) In connection with PSNH’s pole purchase agreement on May 1, 2023, the purchase price included the forgiveness of previously reserved receivables for reimbursement of operation and maintenance and vegetation management 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, 2023 September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 28.5 $ 7.0 $ 12.9 $ 3.7 $ 55.3 $ 16.2 $ 21.6 $ 6.8 AFUDC Equity 21.0 5.2 12.5 1.6 12.6 3.7 6.5 0.7 Equity in Earnings of Unconsolidated Affiliates 2.7 — 0.1 — 3.8 — 0.1 — Investment Income 2.7 1.5 0.7 0.4 1.3 0.2 0.4 0.2 Interest Income 24.1 4.6 13.6 1.5 14.1 1.8 9.2 0.4 Other 0.1 — 0.1 — 2.7 — 0.1 — Total Other Income, Net $ 79.1 $ 18.3 $ 39.9 $ 7.2 $ 89.8 $ 21.9 $ 37.9 $ 8.1 For the Nine Months Ended September 30, 2023 September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 96.6 $ 24.9 $ 41.7 $ 11.8 $ 164.5 $ 48.3 $ 64.0 $ 20.1 AFUDC Equity 55.5 13.9 34.0 3.4 33.7 9.3 17.5 1.7 Equity in Earnings of Unconsolidated Affiliates (1) 11.5 — 0.3 — 20.8 — 0.2 — Investment (Loss)/Income (0.4) (0.2) 0.5 — 2.4 (0.9) 0.6 0.5 Interest Income 68.6 8.0 44.0 3.6 30.3 4.6 18.8 1.1 Other (1) 31.2 — 0.2 0.4 3.6 — 0.3 — Total Other Income, Net $ 263.0 $ 46.6 $ 120.7 $ 19.2 $ 255.3 $ 61.3 $ 101.4 $ 23.4 (1) Eversource’s equity method investment in a renewable energy fund was liquidated in March 2023. Liquidation proceeds in excess of the carrying value were recorded in 2023 within Other in the table above. See Note 1E, "Summary of Significant Accounting Policies - Investments in Unconsolidated Affiliates," for further information. For the nine months ended September 30, 2022, pre-tax income of $12.2 million associated with this investment was included in Equity in Earnings of Unconsolidated Affiliates within Other Income, Net in the table above.
Investments in Unconsolidated Affiliates	Eversource's investments included the following: Investment Balance (Millions of Dollars) Ownership Interest As of September 30, 2023 As of December 31, 2022 Offshore Wind Business 50 % $ 2,578.6 $ 1,947.1 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 116.8 118.8 Renewable Energy Investment Fund 90 % — 84.1 Other various 28.5 26.1 Total Investments in Unconsolidated Affiliates $ 2,723.9 $ 2,176.1
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, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Eversource $ 53.7 $ 52.9 $ 153.4 $ 146.0 CL&P 50.2 49.2 132.2 126.0
Non-cash Investing Activities	Non-cash investing activities include plant additions included in Accounts Payable as follows: (Millions of Dollars) As of September 30, 2023 As of September 30, 2022 Eversource $ 462.4 $ 394.1 CL&P 86.3 96.7 NSTAR Electric 135.9 94.5 PSNH 71.9 49.7
Reconciliation of Cash Balances to Cash and Restricted Cash	The following table reconciles cash and cash equivalents as reported on the balance sheets to the cash, cash equivalents and restricted cash balance as reported on the statements of cash flows: As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Cash and Cash Equivalents as reported on the Balance Sheets $ 78.8 $ 9.8 $ 6.0 $ 33.9 $ 374.6 $ 11.3 $ 327.7 $ 0.1 Restricted cash included in: Special Deposits 68.4 9.1 8.8 18.2 102.2 8.8 17.5 33.1 Marketable Securities 16.2 — — — 25.4 0.2 0.1 0.4 Other Long-Term Assets 17.5 — — 3.2 19.6 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 180.9 $ 18.9 $ 14.8 $ 55.3 $ 521.8 $ 20.3 $ 345.3 $ 36.8

REGULATORY ACCOUNTING (Tables)

REGULATORY ACCOUNTING (Tables)	9 Months Ended
	Sep. 30, 2023
Regulated Operations [Abstract]
Components of Regulatory Assets	The components of regulatory assets were as follows: As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Storm Costs, Net $ 1,700.6 $ 882.7 $ 553.9 $ 264.0 $ 1,379.1 $ 799.3 $ 484.4 $ 95.4 Regulatory Tracking Mechanisms 1,173.3 254.3 473.4 166.1 1,075.3 216.8 391.5 73.7 Benefit Costs 863.4 143.2 278.0 51.8 921.7 156.7 299.5 56.6 Income Taxes, Net 879.6 504.5 125.7 17.6 853.3 491.1 115.6 16.0 Securitized Stranded Costs 403.3 — — 403.3 435.7 — — 435.7 Goodwill-related 268.3 — 230.4 — 281.0 — 241.2 — Derivative Liabilities 136.6 136.6 — — 181.8 181.8 — — Asset Retirement Obligations 135.0 37.8 70.9 4.7 127.9 35.9 68.2 4.4 Other Regulatory Assets 296.5 23.5 96.3 9.0 322.5 26.2 114.0 14.4 Total Regulatory Assets 5,856.6 1,982.6 1,828.6 916.5 5,578.3 1,907.8 1,714.4 696.2 Less: Current Portion 1,507.9 383.7 638.5 177.1 1,335.5 314.1 492.8 102.2 Total Long-Term Regulatory Assets $ 4,348.7 $ 1,598.9 $ 1,190.1 $ 739.4 $ 4,242.8 $ 1,593.7 $ 1,221.6 $ 594.0
Components of Regulatory Liabilities	The components of regulatory liabilities were as follows: As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH EDIT due to Tax Cuts and Jobs Act of 2017 $ 2,568.6 $ 973.4 $ 915.2 $ 341.6 $ 2,619.3 $ 983.6 $ 944.3 $ 348.6 Cost of Removal 680.8 154.9 418.3 16.0 670.6 130.8 405.3 14.7 Regulatory Tracking Mechanisms 740.5 205.4 345.2 108.4 890.8 361.0 336.1 155.0 Deferred Portion of Non-Service Income 333.4 46.1 166.8 34.7 270.9 34.5 139.7 28.8 AFUDC - Transmission 117.6 53.5 64.1 — 98.2 48.2 50.0 — Benefit Costs 43.9 0.5 21.4 — 55.4 0.7 31.4 — Other Regulatory Liabilities 261.4 30.4 72.6 4.9 215.9 40.6 14.5 6.5 Total Regulatory Liabilities 4,746.2 1,464.2 2,003.6 505.6 4,821.1 1,599.4 1,921.3 553.6 Less: Current Portion 724.4 155.9 416.0 114.6 890.8 336.0 373.2 162.0 Total Long-Term Regulatory Liabilities $ 4,021.8 $ 1,308.3 $ 1,587.6 $ 391.0 $ 3,930.3 $ 1,263.4 $ 1,548.1 $ 391.6

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 (Millions of Dollars) Distribution - Electric $ 19,238.3 $ 18,326.2 Distribution - Natural Gas 7,754.4 7,443.8 Transmission - Electric 14,233.1 13,709.3 Distribution - Water 2,203.6 2,112.6 Solar 200.8 200.8 Utility 43,630.2 41,792.7 Other (1) 1,959.2 1,738.1 Property, Plant and Equipment, Gross 45,589.4 43,530.8 Less: Accumulated Depreciation Utility (9,518.6) (9,167.4) Other (823.0) (706.1) Total Accumulated Depreciation (10,341.6) (9,873.5) Property, Plant and Equipment, Net 35,247.8 33,657.3 Construction Work in Progress 3,270.5 2,455.5 Total Property, Plant and Equipment, Net $ 38,518.3 $ 36,112.8 As of September 30, 2023 As of December 31, 2022 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,717.0 $ 8,816.5 $ 2,745.1 $ 7,370.1 $ 8,410.0 $ 2,586.4 Transmission - Electric 6,345.8 5,536.6 2,352.4 6,165.1 5,333.8 2,212.0 Solar — 200.8 — — 200.8 — Property, Plant and Equipment, Gross 14,062.8 14,553.9 5,097.5 13,535.2 13,944.6 4,798.4 Less: Accumulated Depreciation (2,659.0) (3,535.5) (974.2) (2,567.1) (3,381.2) (912.3) Property, Plant and Equipment, Net 11,403.8 11,018.4 4,123.3 10,968.1 10,563.4 3,886.1 Construction Work in Progress 632.2 1,390.8 309.7 498.9 1,063.6 174.1 Total Property, Plant and Equipment, Net $ 12,036.0 $ 12,409.2 $ 4,433.0 $ 11,467.0 $ 11,627.0 $ 4,060.2 (1) These assets are primarily comprised of computer software, hardware and equipment at Eversource Service and buildings at The Rocky River Realty Company.

DERIVATIVE INSTRUMENTS (Tables)

DERIVATIVE INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 CL&P (Millions of Dollars) Fair Value Hierarchy Commodity Supply and Price Risk Netting (1) Net Amount Commodity Supply and Price Risk Netting (1) Net Amount Current Derivative Assets Level 3 $ 16.9 $ (0.5) $ 16.4 $ 16.3 $ (0.5) $ 15.8 Long-Term Derivative Assets Level 3 17.0 (0.5) 16.5 28.8 (0.9) 27.9 Current Derivative Liabilities Level 3 (84.2) — (84.2) (81.6) — (81.6) Long-Term Derivative Liabilities Level 3 (85.3) — (85.3) (143.9) — (143.9) (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.
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) 2023 2022 2023 2022 Derivatives, Net: Fair Value as of Beginning of Period $ (152.1) $ (213.3) $ (181.8) $ (249.2) Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets (1.5) 2.4 (1.6) 11.2 Settlements 17.0 15.0 46.8 42.1 Fair Value as of End of Period $ (136.6) $ (195.9) $ (136.6) $ (195.9)

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	9 Months Ended
	Sep. 30, 2023
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: As of September 30, 2023 As of December 31, 2022 Eversource (Millions of Dollars) Amortized Cost Pre-Tax Pre-Tax Fair Value Amortized Cost Pre-Tax Pre-Tax Fair Value Debt Securities $ 173.0 $ 0.3 $ (11.0) $ 162.3 $ 201.6 $ 0.1 $ (16.2) $ 185.5
Contractual Maturities of Available-for-Sale Debt Securities	As of September 30, 2023, 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) $ 19.0 $ 19.4 One to five years 29.9 29.2 Six to ten years 41.7 39.9 Greater than ten years 82.4 73.8 Total Debt Securities $ 173.0 $ 162.3
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, 2023 As of December 31, 2022 Level 1: Mutual Funds and Equities $ 168.3 $ 190.1 Money Market Funds 16.2 25.4 Total Level 1 $ 184.5 $ 215.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 86.1 $ 82.3 Corporate Debt Securities 34.1 46.1 Asset-Backed Debt Securities 5.9 8.6 Municipal Bonds 9.3 12.7 Other Fixed Income Securities 10.7 10.4 Total Level 2 $ 146.1 $ 160.1 Total Marketable Securities $ 330.6 $ 375.6

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 December 31, 2022 September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 1,320.3 $ 1,442.2 $ 679.7 $ 557.8 5.53 % 4.63 % NSTAR Electric Commercial Paper Program 209.5 — 440.5 650.0 5.35 % — %
Summary of Long-Term Debt Issuance and Repayments	The following table summarizes long-term debt issuances and repayments: (Millions of Dollars) Interest Rate Issuance/(Repayment) Issue Date or Repayment Date Maturity Date Use of Proceeds for Issuance/ CL&P 2023 Series A First Mortgage Bonds 5.25 % $ 500.0 January 2023 January 2053 Repaid 2013 Series A Bonds at maturity and short-term debt, and paid capital expenditures and working capital CL&P 2013 Series A First Mortgage Bonds 2.50 % (400.0) January 2023 January 2023 Paid at maturity CL&P 2023 Series B First Mortgage Bonds 4.90 % 300.0 July 2023 July 2033 Repaid short-term debt, paid capital expenditures and working capital NSTAR Electric 2023 Debentures 5.60 % 150.0 September 2023 October 2028 Repay Series G Senior Notes at maturity and short-term debt and for general corporate purposes PSNH Series W First Mortgage Bonds 5.15 % 300.0 January 2023 January 2053 Repaid short-term debt, paid capital expenditures and working capital PSNH Series X First Mortgage Bonds 5.35 % 300.0 September 2023 October 2033 Repaid Series S Bonds at maturity and for general corporate purposes PSNH Series S First Mortgage Bonds 3.50 % (325.0) November 2023 November 2023 Paid at maturity Eversource Parent Series Z Senior Notes 5.45 % 750.0 March 2023 March 2028 Repaid Series F Senior Notes at maturity and short-term debt Eversource Parent Series F Senior Notes 2.80 % (450.0) May 2023 May 2023 Paid at maturity Eversource Parent Series Z Senior Notes 5.45 % 550.0 May 2023 March 2028 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Series AA Senior Notes 4.75 % 450.0 May 2023 May 2026 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Series BB Senior Notes 5.125 % 800.0 May 2023 May 2033 Repay Series T Senior Notes and Series N Senior Notes at maturity and short-term debt Eversource Parent Variable Rate Series T Senior Notes SOFR plus 0.25% (350.0) August 2023 August 2023 Paid at maturity Yankee Gas Series V First Mortgage Bonds 5.51 % 170.0 August 2023 August 2030 Repaid short-term debt and general corporate purposes Aquarion Water Company of Connecticut Senior Notes 5.89 % 50.0 September 2023 October 2043 Repaid existing indebtedness, paid capital expenditures and general corporate purposes

RATE REDUCTION BONDS AND VARI_2

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 Restricted Cash - Current Portion (included in Current Assets) $ 16.6 $ 32.4 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 403.3 435.7 Other Regulatory Liabilities (included in Regulatory Liabilities) 6.7 6.0 Accrued Interest (included in Other Current Liabilities) 2.5 6.9 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 367.3 410.5 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended For the Nine Months Ended September 30, 2023 September 30, 2022 September 30, 2023 September 30, 2022 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) 3.9 4.2 11.9 12.9

PENSION BENEFITS AND POSTRETI_2

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)	9 Months Ended
	Sep. 30, 2023
Postemployment Benefits [Abstract]
Components of Net Periodic Benefit Expense/(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, 2023 For the Three Months Ended September 30, 2023 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Service Cost $ 10.7 $ 3.1 $ 1.9 $ 1.0 $ 1.9 $ 0.4 $ 0.3 $ 0.2 Interest Cost 63.4 12.6 13.5 6.8 8.5 1.5 2.3 0.9 Expected Return on Plan Assets (116.3) (23.5) (28.4) (12.3) (19.3) (2.3) (9.2) (1.4) Actuarial Loss 10.9 0.5 4.0 0.4 — — — — Prior Service Cost/(Credit) 0.3 — 0.1 — (5.4) 0.2 (4.2) 0.1 Settlement Loss 8.7 — — — — — — — Total Net Periodic Benefit Plan Income $ (22.3) $ (7.3) $ (8.9) $ (4.1) $ (14.3) $ (0.2) $ (10.8) $ (0.2) Intercompany Expense/(Income) Allocations N/A $ 0.8 $ 0.9 $ 0.3 N/A $ (0.5) $ (0.5) $ (0.2) Pension and SERP PBOP For the Nine Months Ended September 30, 2023 For the Nine Months Ended September 30, 2023 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 32.4 $ 9.2 $ 5.9 $ 3.2 $ 5.7 $ 1.0 $ 0.9 $ 0.6 Interest Cost 190.6 37.9 40.5 20.4 25.4 4.6 6.9 2.7 Expected Return on Plan Assets (348.7) (70.6) (85.3) (37.1) (57.9) (7.0) (27.7) (4.2) Actuarial Loss 35.0 1.9 12.9 1.2 — — — — Prior Service Cost/(Credit) 0.9 — 0.3 — (16.2) 0.8 (12.7) 0.3 Settlement Loss 12.4 — — — — — — — Total Net Periodic Benefit Plan Income $ (77.4) $ (21.6) $ (25.7) $ (12.3) $ (43.0) $ (0.6) $ (32.6) $ (0.6) Intercompany Income Allocations N/A $ (1.8) $ (1.2) $ (0.3) N/A $ (1.4) $ (1.6) $ (0.5) Pension and SERP PBOP For the Three Months Ended September 30, 2022 For the Three Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 17.5 $ 4.7 $ 3.4 $ 1.7 $ 2.9 $ 0.5 $ 0.5 $ 0.3 Interest Cost 38.6 7.8 8.2 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (130.7) (26.5) (32.1) (14.0) (22.5) (2.8) (10.6) (1.7) Actuarial Loss 28.4 4.0 8.1 1.9 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (45.8) $ (10.0) $ (12.3) $ (6.2) $ (20.0) $ (1.1) $ (13.0) $ (0.8) Intercompany Income Allocations N/A $ (4.0) $ (3.2) $ (1.0) N/A $ (0.9) $ (0.9) $ (0.3) Pension and SERP PBOP For the Nine Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 52.7 $ 13.9 $ 10.4 $ 5.2 $ 8.7 $ 1.5 $ 1.5 $ 0.8 Interest Cost 115.8 23.4 24.5 12.6 15.1 2.7 3.9 1.6 Expected Return on Plan Assets (393.1) (79.6) (96.2) (42.1) (67.5) (8.4) (31.8) (5.0) Actuarial Loss 87.5 12.2 24.7 6.0 — — — — Prior Service Cost/(Credit) 1.1 — 0.3 — (16.2) 0.8 (12.7) 0.3 Total Net Periodic Benefit Plan Income $ (136.0) $ (30.1) $ (36.3) $ (18.3) $ (59.9) $ (3.4) $ (39.1) $ (2.3) Intercompany Income Allocations N/A $ (11.9) $ (9.3) $ (2.7) N/A $ (2.7) $ (2.7) $ (0.9)

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 As of December 31, 2022 Number of Sites Reserve Number of Sites Reserve Eversource 63 $ 130.5 59 $ 122.6 CL&P 14 12.6 13 13.9 NSTAR Electric 12 5.4 10 3.4 PSNH 8 7.7 8 6.1
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, and primarily relates to its offshore wind business: As of September 30, 2023 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore Construction-related purchase agreements with third-party contractors (1) $ 705.8 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 823.3 2025 - 2028 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 381.1 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 55.5 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of South Fork Wind (5) 77.4 (5) South Fork Class B Member, LLC Funding and indemnification obligations of South Fork Wind (6) 77.4 (6) Eversource Investment LLC Funding and indemnification obligations of North East Offshore (7) 29.8 (7) South Fork Wind, LLC Power Purchase Agreement Security (8) 7.1 (8) Sunrise Wind LLC OREC capacity production (9) 11.0 (9) Bay State Wind LLC Real estate purchase 2.5 2024 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (10) 15.2 — Eversource TEI LLC South Fork Wind Tax Equity (11) — (11) Various Surety bonds (12) 38.8 2023 - 2024 Eversource Service Lease payments for real estate 0.3 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, 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 and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 7, below. (2) Eversource parent issued guarantees 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 $1.06 billion, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and October 2028 and (ii) full performance of the guaranteed obligations. (3) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $546.4 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations. (4) Eversource parent issued 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 construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $161.0 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from October 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary Eversource Investment LLC (EI), which holds Eversource's investments in offshore wind-related equity method investments, whereby Eversource parent will guarantee EI’s performance of certain obligations, in an amount not to exceed $110.0 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (6) Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Class B Member, LLC, whereby Eversource parent will guarantee South Fork Class B Member, LLC’s performance of certain obligations, in an amount not to exceed $499.5 million, primarily in connection with capital expenditure funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (7) Eversource parent issued a guarantee (Funding Guarantee) on behalf of EI, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the operating agreement of NEO, in an 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. (8) Eversource parent issued a guarantee 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 an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guaranteed obligations. (9) 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 amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed 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. (10) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, 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. In January 2022, EI issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million. In June 2023, EI issued a letter of credit on behalf of Sunrise Wind LLC related to future environmental remediation in the amount of $9.9 million. In September 2023, EI issued a letter of credit on behalf of Revolution Wind, LLC related to onshore transmission construction in the amount of $1.0 million. (11) Eversource parent issued a guarantee on behalf of its wholly-owned subsidiary, Eversource TEI LLC, whereby Eversource parent will guarantee Eversource TEI LLC’s performance of certain obligations, in an amount not to exceed $528.4 million, primarily in connection with tax equity funding obligations during the construction phase of the South Fork Wind project. Eversource parent obligations expire upon the full performance of the guaranteed obligations. (12) 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.

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2023
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 Fair Carrying Fair Carrying Fair Carrying Fair As of September 30, 2023: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 118.0 $ 116.2 $ 87.2 $ 43.0 $ 30.8 $ — $ — Long-Term Debt 24,159.1 21,260.5 4,606.8 4,025.3 4,576.5 4,071.1 1,756.6 1,483.4 Rate Reduction Bonds 410.5 381.6 — — — — 410.5 381.6 As of December 31, 2022: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 136.7 $ 116.2 $ 99.2 $ 43.0 $ 37.5 $ — $ — Long-Term Debt 21,044.1 18,891.3 4,216.5 3,828.3 4,425.1 4,091.8 1,164.6 970.5 Rate Reduction Bonds 453.7 424.7 — — — — 453.7 424.7

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Qualified Unrealized Defined Total Qualified Unrealized Defined Total Balance as of Beginning of Period $ (0.4) $ (1.2) $ (37.8) $ (39.4) $ (0.4) $ 0.4 $ (42.3) $ (42.3) OCI Before Reclassifications — — 0.1 0.1 — (2.0) (2.5) (4.5) Amounts Reclassified from AOCI — 1.2 14.1 15.3 — — 5.8 5.8 Net OCI — 1.2 14.2 15.4 — (2.0) 3.3 1.3 Balance as of End of Period $ (0.4) $ — $ (23.6) $ (24.0) $ (0.4) $ (1.6) $ (39.0) $ (41.0)

COMMON SHARES (Tables)

COMMON SHARES (Tables)	9 Months Ended
	Sep. 30, 2023
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 Issued as of Par Value September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 Eversource $ 5 410,000,000 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 100,000,000 200 200 PSNH $ 1 100,000,000 100,000,000 301 301

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 September 30, 2022 September 30, 2023 September 30, 2022 Net Income Attributable to Common Shareholders $ 339.7 $ 349.4 $ 846.2 $ 1,084.7 Weighted Average Common Shares Outstanding: Basic 349,704,155 347,297,411 349,461,219 346,115,823 Dilutive Effect 147,814 465,282 270,101 457,278 Diluted 349,851,969 347,762,693 349,731,320 346,573,101 Basic EPS $ 0.97 $ 1.01 $ 2.42 $ 3.13 Diluted EPS $ 0.97 $ 1.00 $ 2.42 $ 3.13

REVENUES (Tables)

REVENUES (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,375.9 $ 83.0 $ — $ 44.7 $ — $ — $ 1,503.6 Commercial 764.1 33.7 — 19.6 — (1.1) 816.3 Industrial 94.5 30.2 — 1.2 — (4.8) 121.1 Total Retail Tariff Sales Revenues 2,234.5 146.9 — 65.5 — (5.9) 2,441.0 Wholesale Transmission Revenues — — 520.2 — — (386.6) 133.6 Wholesale Market Sales Revenues 154.9 71.6 — 1.1 — — 227.6 Other Revenues from Contracts with Customers 20.9 1.3 4.8 2.0 394.7 (392.4) 31.3 Total Revenues from Contracts with Customers 2,410.3 219.8 525.0 68.6 394.7 (784.9) 2,833.5 Alternative Revenue Programs (43.8) (2.4) (33.6) (0.3) — 31.9 (48.2) Other Revenues 4.8 0.9 0.2 0.3 — — 6.2 Total Operating Revenues $ 2,371.3 $ 218.3 $ 491.6 $ 68.6 $ 394.7 $ (753.0) $ 2,791.5 For the Nine Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,982.1 $ 858.0 $ — $ 112.6 $ — $ — $ 4,952.7 Commercial 2,244.7 483.6 — 53.2 — (3.4) 2,778.1 Industrial 268.5 141.7 — 3.4 — (14.6) 399.0 Total Retail Tariff Sales Revenues 6,495.3 1,483.3 — 169.2 — (18.0) 8,129.8 Wholesale Transmission Revenues — — 1,358.2 — — (1,015.6) 342.6 Wholesale Market Sales Revenues 484.4 160.5 — 2.9 — — 647.8 Other Revenues from Contracts with Customers 60.1 3.9 14.1 6.1 1,217.3 (1,210.7) 90.8 Total Revenues from Contracts with Customers 7,039.8 1,647.7 1,372.3 178.2 1,217.3 (2,244.3) 9,211.0 Alternative Revenue Programs (40.7) 21.9 57.6 (2.0) — (50.8) (14.0) Other Revenues 15.2 3.0 0.5 0.8 — — 19.5 Total Operating Revenues $ 7,014.3 $ 1,672.6 $ 1,430.4 $ 177.0 $ 1,217.3 $ (2,295.1) $ 9,216.5 For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,492.9 $ 94.7 $ — $ 45.7 $ — $ — $ 1,633.3 Commercial 890.5 76.7 — 18.5 — (1.7) 984.0 Industrial 105.6 33.6 — 1.3 — (5.2) 135.3 Total Retail Tariff Sales Revenues 2,489.0 205.0 — 65.5 — (6.9) 2,752.6 Wholesale Transmission Revenues — — 520.3 — 29.9 (416.3) 133.9 Wholesale Market Sales Revenues 317.1 22.7 — 1.1 — — 340.9 Other Revenues from Contracts with Customers 17.3 0.6 3.4 2.1 313.6 (311.9) 25.1 Amortization of/(Reserve for) Revenues Subject to Refund (1) 7.0 — — (0.1) — — 6.9 Total Revenues from Contracts with Customers 2,830.4 228.3 523.7 68.6 343.5 (735.1) 3,259.4 Alternative Revenue Programs (37.7) (2.8) (55.1) (3.6) — 52.6 (46.6) Other Revenues 2.4 0.1 0.2 0.1 — — 2.8 Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 3,683.9 $ 870.0 $ — $ 109.1 $ — $ — $ 4,663.0 Commercial 2,216.0 456.9 — 49.9 — (4.2) 2,718.6 Industrial 284.1 145.2 — 3.5 — (14.8) 418.0 Total Retail Tariff Sales Revenues 6,184.0 1,472.1 — 162.5 — (19.0) 7,799.6 Wholesale Transmission Revenues — — 1,301.0 — 79.4 (1,047.3) 333.1 Wholesale Market Sales Revenues 895.2 89.3 — 2.8 — — 987.3 Other Revenues from Contracts with Customers 53.4 2.8 10.5 6.2 983.3 (974.9) 81.3 Amortization of/(Reserve for) Revenues Subject to Refund (1) 71.9 — 0.7 (0.9) — — 71.7 Total Revenues from Contracts with Customers 7,204.5 1,564.2 1,312.2 170.6 1,062.7 (2,041.2) 9,273.0 Alternative Revenue Programs (26.2) 4.3 48.9 (2.8) — (46.9) (22.7) Other Revenues 7.5 0.9 0.5 0.4 — — 9.3 Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 For the Three Months Ended September 30, 2023 For the Three Months Ended September 30, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 703.9 $ 480.5 $ 191.5 $ 739.1 $ 507.6 $ 246.2 Commercial 286.4 389.4 88.7 311.2 469.6 110.4 Industrial 39.0 31.9 23.6 41.9 39.3 24.4 Total Retail Tariff Sales Revenues 1,029.3 901.8 303.8 1,092.2 1,016.5 381.0 Wholesale Transmission Revenues 245.1 186.4 88.7 250.3 183.8 86.2 Wholesale Market Sales Revenues 112.8 28.6 13.5 232.9 57.5 26.7 Other Revenues from Contracts with Customers 7.7 12.4 5.0 7.5 10.7 3.1 Amortization of Revenues Subject to Refund (1) 1.3 — — 7.0 — — Total Revenues from Contracts with Customers 1,396.2 1,129.2 411.0 1,589.9 1,268.5 497.0 Alternative Revenue Programs (49.3) (29.0) 0.9 (65.1) (20.5) (7.2) Other Revenues 2.4 1.9 0.7 0.2 1.8 0.6 Eliminations (159.2) (148.6) (59.5) (155.9) (144.3) (59.8) Total Operating Revenues $ 1,190.1 $ 953.5 $ 353.1 $ 1,369.1 $ 1,105.5 $ 430.6 For the Nine Months Ended September 30, 2023 For the Nine Months Ended September 30, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 2,059.9 $ 1,318.7 $ 603.5 $ 1,864.4 $ 1,239.0 $ 580.5 Commercial 836.7 1,121.0 287.5 808.7 1,128.8 280.5 Industrial 104.1 95.7 68.7 111.4 104.0 68.7 Total Retail Tariff Sales Revenues 3,000.7 2,535.4 959.7 2,784.5 2,471.8 929.7 Wholesale Transmission Revenues 613.3 521.0 223.9 575.2 512.7 213.1 Wholesale Market Sales Revenues 330.4 102.1 51.9 656.3 163.1 75.8 Other Revenues from Contracts with Customers 24.7 36.0 12.2 22.8 34.1 8.8 Amortization of Revenues Subject to Refund (1) 3.1 — — 72.6 — — Total Revenues from Contracts with Customers 3,972.2 3,194.5 1,247.7 4,111.4 3,181.7 1,227.4 Alternative Revenue Programs 28.0 (43.5) 32.4 28.3 (14.4) 8.8 Other Revenues 7.1 6.3 2.3 0.5 5.4 2.1 Eliminations (444.1) (428.5) (159.1) (449.6) (420.4) (161.2) Total Operating Revenues $ 3,563.2 $ 2,728.8 $ 1,123.3 $ 3,690.6 $ 2,752.3 $ 1,077.1 (1) Amortization of/(Reserve for) Revenues Subject to Refund within the Electric Distribution segment in the third quarter and the first nine months of 2022 primarily represents the reversal of a 2021 reserve at CL&P established to provide bill credits to customers as a result of the settlement agreement on October 1, 2021 and a storm performance penalty assessed by PURA. The reserve was reversed as customer credits were distributed to CL&P’s customers in retail electric rates. Total customer credits as a result of the 2021 settlement and civil penalty were $93.4 million. The settlement amount of $65 million was refunded over a two-month billing period from December 1, 2021 to January 31, 2022 and the civil penalty of $28.4 million was refunded over a one year billing period, which began September 1, 2021.

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	9 Months Ended
	Sep. 30, 2023
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, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,371.3 $ 218.3 $ 491.6 $ 68.6 $ 394.7 $ (753.0) $ 2,791.5 Depreciation and Amortization (0.7) (38.0) (94.5) (13.9) (40.7) 2.3 (185.5) Other Operating Expenses (2,124.0) (211.1) (144.9) (30.9) (315.7) 751.2 (2,075.4) Operating Income/(Loss) $ 246.6 $ (30.8) $ 252.2 $ 23.8 $ 38.3 $ 0.5 $ 530.6 Interest Expense $ (76.8) $ (19.7) $ (43.0) $ (9.8) $ (111.4) $ 38.4 $ (222.3) Other Income, Net 53.5 9.2 11.9 1.3 415.9 (412.7) 79.1 Net Income/(Loss) Attributable to Common 173.3 (33.7) 160.3 16.6 397.0 (373.8) 339.7 For the Nine Months Ended September 30, 2023 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 7,014.3 $ 1,672.6 $ 1,430.4 $ 177.0 $ 1,217.3 $ (2,295.1) $ 9,216.5 Depreciation and Amortization 59.3 (156.7) (276.4) (41.3) (115.5) 6.6 (524.0) Other Operating Expenses (6,371.4) (1,280.8) (409.4) (87.5) (992.6) 2,290.0 (6,851.7) Operating Income $ 702.2 $ 235.1 $ 744.6 $ 48.2 $ 109.2 $ 1.5 $ 1,840.8 Interest Expense $ (214.4) $ (62.4) $ (126.7) $ (28.4) $ (297.0) $ 104.8 $ (624.1) Impairment of Offshore Wind Investment — — — — (401.0) — (401.0) Other Income, Net 155.7 27.9 30.8 4.0 1,082.6 (1,038.0) 263.0 Net Income Attributable to Common Shareholders 504.3 148.2 476.4 27.4 621.6 (931.7) 846.2 Cash Flows Used for Investments in Plant 1,230.3 536.8 1,011.3 140.1 207.1 — 3,125.6 For the Three Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,795.1 $ 225.6 $ 468.8 $ 65.1 $ 343.5 $ (682.5) $ 3,215.6 Depreciation and Amortization (256.9) (25.1) (85.1) (12.7) (35.4) 1.8 (413.4) Other Operating Expenses (2,261.5) (226.3) (143.7) (28.8) (265.7) 681.1 (2,244.9) Operating Income/(Loss) $ 276.7 $ (25.8) $ 240.0 $ 23.6 $ 42.4 $ 0.4 $ 557.3 Interest Expense $ (64.5) $ (18.8) $ (36.6) $ (8.7) $ (69.6) $ 20.0 $ (178.2) Other Income, Net 59.6 11.1 10.1 2.1 429.9 (423.0) 89.8 Net Income/(Loss) Attributable to Common 225.1 (24.6) 155.8 16.7 379.0 (402.6) 349.4 For the Nine Months Ended September 30, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 7,185.8 $ 1,569.4 $ 1,361.6 $ 168.2 $ 1,062.7 $ (2,088.1) $ 9,259.6 Depreciation and Amortization (806.7) (116.2) (250.3) (37.5) (98.8) 5.1 (1,304.4) Other Operating Expenses (5,743.2) (1,244.3) (414.3) (82.9) (876.5) 2,081.9 (6,279.3) Operating Income $ 635.9 $ 208.9 $ 697.0 $ 47.8 $ 87.4 $ (1.1) $ 1,675.9 Interest Expense $ (184.2) $ (51.2) $ (107.3) $ (25.2) $ (169.9) $ 46.3 $ (491.5) Other Income, Net 160.1 31.9 28.3 6.4 1,280.1 (1,251.5) 255.3 Net Income Attributable to Common Shareholders 495.0 147.2 455.8 29.4 1,163.6 (1,206.3) 1,084.7 Cash Flows Used for Investments in Plant 823.9 424.5 823.3 103.4 177.6 — 2,352.7 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of September 30, 2023 $ 28,840.9 $ 8,404.5 $ 14,693.4 $ 2,885.1 $ 29,019.0 $ (27,549.6) $ 56,293.3 As of December 31, 2022 27,365.0 8,084.9 13,369.5 2,783.8 26,365.2 (24,737.5) 53,230.9

SUMMARY OF SIGNIFICANT ACCOUN_4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) customer in Millions			3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 23, 2023 USD ($)	May 25, 2023 USD ($) a project mile	Sep. 30, 2023 USD ($) project	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) project	Sep. 30, 2023 USD ($) regulatedUtility project customer	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary of Accounting Policies [Line Items]
Number of electric, natural gas and water customers | customer								4.4
Allowance for uncollectible accounts for late fees and other receivable amounts			$ 542,700,000	$ 532,400,000		$ 457,600,000	$ 542,700,000	$ 542,700,000	$ 457,600,000	$ 486,300,000	$ 457,800,000	$ 417,400,000
Number of offshore wind projects | project		3	3				3	3
Payments for investment								$ 887,365,000	617,588,000
Impairment charge			$ 0	401,000,000		0		401,000,000	0
After-tax impairment				331,000,000
Valuation allowance				$ 40,000,000
Percent realized of investment tax credit				0.10
Expected value of investment tax credit				$ 400,000,000
Energy Relief Fund - Merrimack Valley Programs
Summary of Accounting Policies [Line Items]
Restricted cash, current			20,000,000				$ 20,000,000	20,000,000		20,000,000
Restricted cash, noncurrent			14,300,000				14,300,000	14,300,000		15,900,000
COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			50,900,000				50,900,000	50,900,000		50,900,000
CL&P
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			276,300,000	262,800,000		198,600,000	276,300,000	$ 276,300,000	198,600,000	225,300,000	192,700,000	181,300,000
Period of accounts receivable recoverable under financial or medical duress								180 days
CL&P | COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			16,000,000				16,000,000	$ 16,000,000		16,000,000
NSTAR Electric
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			100,800,000	97,800,000		99,500,000	100,800,000	100,800,000	99,500,000	95,000,000	100,500,000	97,000,000
NSTAR Electric | COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			4,100,000				4,100,000	4,100,000		4,100,000
PSNH
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			12,400,000	12,700,000		$ 28,800,000	12,400,000	12,400,000	$ 28,800,000	29,200,000	$ 27,300,000	$ 24,300,000
PSNH | COVID-19
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts			$ 0				$ 0	$ 0		$ 0
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 | regulatedUtility								12
Offshore Wind Business
Summary of Accounting Policies [Line Items]
Ownership interest (percent)		50%	50%				50%	50%
North East Offshore
Summary of Accounting Policies [Line Items]
Ownership interest (percent)			50%				50%	50%
Renewable Energy Investment Fund
Summary of Accounting Policies [Line Items]
Ownership interest (percent)			90%				90%	90%
Proceeds from sale of equity method investments				$ 23,600,000	$ 123,400,000			$ 147,000,000
Renewable Energy Investment Fund | Equity Method Investee
Summary of Accounting Policies [Line Items]
Charitable contributions					$ 20,000,000
Uncommitted Lease Area
Summary of Accounting Policies [Line Items]
Ownership interest (percent)		50%
Number of miles off south coast of Massachusetts | mile		25
Uncommitted area of developable acres (in acres) | a		175,000
Payments for investment		$ 625,000,000
Tax Equity Capital Contribution Agreement
Summary of Accounting Policies [Line Items]
Payments for investment	$ 528,000,000
South Fork Wind Holdings, LLC Class A shares
Summary of Accounting Policies [Line Items]
Ownership interest (percent)			100%				100%	100%
Sunrise Wind LLC
Summary of Accounting Policies [Line Items]
Ownership interest (percent)			50%				50%	50%
Expected cash flows from sale of investment							$ 450,000,000

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 532,400	$ 457,800	$ 486,300	$ 417,400
Uncollectible Expense	16,800	10,700	40,945	40,753
Uncollectible Costs Deferred	47,900	25,000	127,500	74,700
Write-Offs	(57,900)	(39,700)	(123,800)	(89,800)
Recoveries Collected	3,500	3,800	11,800	14,500
Ending Balance	542,700	457,600	542,700	457,600
CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	262,800	192,700	225,300	181,300
Uncollectible Expense	2,400	4,100	7,106	10,816
Uncollectible Costs Deferred	32,500	13,300	89,600	24,300
Write-Offs	(22,500)	(12,700)	(50,300)	(23,800)
Recoveries Collected	1,100	1,200	4,600	6,000
Ending Balance	276,300	198,600	276,300	198,600
NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	97,800	100,500	95,000	97,000
Uncollectible Expense	5,200	3,500	12,988	12,159
Uncollectible Costs Deferred	7,900	6,800	19,600	16,700
Write-Offs	(11,400)	(12,600)	(30,800)	(31,300)
Recoveries Collected	1,300	1,300	4,000	4,900
Ending Balance	100,800	99,500	100,800	99,500
PSNH
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	12,700	27,300	29,200	24,300
Uncollectible Expense	2,000	3,500	1,534	8,060
Uncollectible Costs Deferred	1,100	100	(11,100)	1,200
Write-Offs	(3,600)	(2,300)	(7,800)	(5,400)
Recoveries Collected	200	200	600	600
Ending Balance	12,400	28,800	12,400	28,800
Hardship Accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	338,200	242,700	284,400	226,100
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	33,900	15,600	104,700	38,000
Write-Offs	(17,500)	(6,500)	(35,300)	(13,500)
Recoveries Collected	200	300	1,000	1,500
Ending Balance	354,800	252,100	354,800	252,100
Hardship Accounts | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	226,500	152,100	188,900	144,600
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	29,400	11,300	80,300	22,300
Write-Offs	(14,900)	(5,000)	(29,000)	(9,400)
Recoveries Collected	200	200	1,000	1,100
Ending Balance	241,200	158,600	241,200	158,600
Hardship Accounts | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	45,600	45,000	43,700	43,300
Uncollectible Expense	0	0	0	0
Uncollectible Costs Deferred	3,400	2,800	5,800	4,900
Write-Offs	100	(300)	(400)	(700)
Recoveries Collected	0	0	0	0
Ending Balance	49,100	47,500	49,100	47,500
Retail (Non-Hardship), Wholesale, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	194,200	215,100	201,900	191,300
Uncollectible Expense	16,800	10,700	40,900	40,800
Uncollectible Costs Deferred	14,000	9,400	22,800	36,700
Write-Offs	(40,400)	(33,200)	(88,500)	(76,300)
Recoveries Collected	3,300	3,500	10,800	13,000
Ending Balance	187,900	205,500	187,900	205,500
Retail (Non-Hardship), Wholesale, and Other | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	36,300	40,600	36,400	36,700
Uncollectible Expense	2,400	4,100	7,100	10,800
Uncollectible Costs Deferred	3,100	2,000	9,300	2,000
Write-Offs	(7,600)	(7,700)	(21,300)	(14,400)
Recoveries Collected	900	1,000	3,600	4,900
Ending Balance	35,100	40,000	35,100	40,000
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	52,200	55,500	51,300	53,700
Uncollectible Expense	5,200	3,500	13,000	12,200
Uncollectible Costs Deferred	4,500	4,000	13,800	11,800
Write-Offs	(11,500)	(12,300)	(30,400)	(30,600)
Recoveries Collected	1,300	1,300	4,000	4,900
Ending Balance	$ 51,700	$ 52,000	$ 51,700	$ 52,000

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Summary of Accounting Policies [Line Items]
Other income, net	$ 79,123	$ 89,831	$ 262,980	$ 255,253
Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	28,500	55,300	96,600	164,500
AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	21,000	12,600	55,500	33,700
Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	2,700	3,800	11,500	20,800
Investment (Loss)/Income
Summary of Accounting Policies [Line Items]
Other income, net	2,700	1,300	(400)	2,400
Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	24,100	14,100	68,600	30,300
Other
Summary of Accounting Policies [Line Items]
Other income, net	100	2,700	31,200	3,600
Equity in Earnings
Summary of Accounting Policies [Line Items]
Unrealized gain associated with investment				12,200
CL&P
Summary of Accounting Policies [Line Items]
Other income, net	18,311	21,927	46,610	61,290
CL&P | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	7,000	16,200	24,900	48,300
CL&P | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	5,200	3,700	13,900	9,300
CL&P | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
CL&P | Investment (Loss)/Income
Summary of Accounting Policies [Line Items]
Other income, net	1,500	200	(200)	(900)
CL&P | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	4,600	1,800	8,000	4,600
CL&P | Other
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
NSTAR Electric
Summary of Accounting Policies [Line Items]
Other income, net	39,908	37,895	120,690	101,385
NSTAR Electric | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	12,900	21,600	41,700	64,000
NSTAR Electric | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	12,500	6,500	34,000	17,500
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	100	100	300	200
NSTAR Electric | Investment (Loss)/Income
Summary of Accounting Policies [Line Items]
Other income, net	700	400	500	600
NSTAR Electric | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	13,600	9,200	44,000	18,800
NSTAR Electric | Other
Summary of Accounting Policies [Line Items]
Other income, net	100	100	200	300
PSNH
Summary of Accounting Policies [Line Items]
Other income, net	7,180	8,073	19,199	23,365
PSNH | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	3,700	6,800	11,800	20,100
PSNH | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	1,600	700	3,400	1,700
PSNH | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0	0	0
PSNH | Investment (Loss)/Income
Summary of Accounting Policies [Line Items]
Other income, net	400	200	0	500
PSNH | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	1,500	400	3,600	1,100
PSNH | Other
Summary of Accounting Policies [Line Items]
Other income, net	$ 0	$ 0	$ 400	$ 0

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2023	May 25, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,723,931		$ 2,176,080
Offshore Wind Business
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50%	50%
Investments in unconsolidated affiliates	$ 2,578,600		1,947,100
Natural Gas Pipeline - Algonquin Gas Transmission, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	15%
Investments in unconsolidated affiliates	$ 116,800		118,800
Renewable Energy Investment Fund
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	90%
Investments in unconsolidated affiliates	$ 0		84,100
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 28,500		$ 26,100

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 53.7	$ 52.9	$ 153.4	$ 146
CL&P
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 50.2	$ 49.2	$ 132.2	$ 126

SUMMARY OF SIGNIFICANT ACCOUN_9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-cash Investing Activities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 462.4	$ 394.1
CL&P
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	86.3	96.7
NSTAR Electric
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	135.9	94.5
PSNH
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 71.9	$ 49.7

SUMMARY OF SIGNIFICANT ACCOU_10

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	$ 78,800	$ 374,600
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	180,907	521,752	$ 602,256	$ 221,008
Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	68,400	102,200
Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	16,200	25,400
Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,500	19,600
CL&P
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	9,800	11,300
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	18,943	20,327	23,120	74,788
CL&P | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	9,100	8,800
CL&P | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	200
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 and Cash Equivalents as reported on the Balance Sheets	6,000	327,700
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	14,846	345,293	470,945	18,179
NSTAR Electric | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	8,800	17,500
NSTAR Electric | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	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 and Cash Equivalents as reported on the Balance Sheets	33,900	100
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	55,307	36,812	$ 24,246	$ 35,126
PSNH | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	18,200	33,100
PSNH | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	400
PSNH | Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 3,200	$ 3,200

REGULATORY ACCOUNTING - Compone

REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 5,856,600	$ 5,578,300
Less:  Current Portion	1,507,888	1,335,491
Total Long-Term Regulatory Assets	4,348,700	4,242,794
Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	1,700,600	1,379,100
Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	1,173,300	1,075,300
Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	863,400	921,700
Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	879,600	853,300
Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	403,300	435,700
Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	268,300	281,000
Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	136,600	181,800
Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	135,000	127,900
Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	296,500	322,500
CL&P
Regulatory Assets [Line Items]
Total Regulatory Assets	1,982,600	1,907,800
Less:  Current Portion	383,672	314,089
Total Long-Term Regulatory Assets	1,598,934	1,593,693
CL&P | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	882,700	799,300
CL&P | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	254,300	216,800
CL&P | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	143,200	156,700
CL&P | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	504,500	491,100
CL&P | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
CL&P | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	136,600	181,800
CL&P | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	37,800	35,900
CL&P | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	23,500	26,200
NSTAR Electric
Regulatory Assets [Line Items]
Total Regulatory Assets	1,828,600	1,714,400
Less:  Current Portion	638,464	492,759
Total Long-Term Regulatory Assets	1,190,138	1,221,619
NSTAR Electric | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	553,900	484,400
NSTAR Electric | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	473,400	391,500
NSTAR Electric | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	278,000	299,500
NSTAR Electric | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	125,700	115,600
NSTAR Electric | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	230,400	241,200
NSTAR Electric | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
NSTAR Electric | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	70,900	68,200
NSTAR Electric | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	96,300	114,000
PSNH
Regulatory Assets [Line Items]
Total Regulatory Assets	916,500	696,200
Less:  Current Portion	177,120	102,240
Total Long-Term Regulatory Assets	739,372	593,974
PSNH | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	264,000	95,400
PSNH | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	166,100	73,700
PSNH | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	51,800	56,600
PSNH | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	17,600	16,000
PSNH | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	403,300	435,700
PSNH | Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH | Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	0	0
PSNH | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	4,700	4,400
PSNH | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 9,000	$ 14,400

REGULATORY ACCOUNTING - Narrati

REGULATORY ACCOUNTING - Narrative (Details) - USD ($) $ in Millions	May 01, 2023	Sep. 30, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved		$ 251.4	$ 210.8
Regulatory costs		85.6	64
Regulatory assets		5,856.6	5,578.3
Operation, maintenance and vegetation expenses
Regulatory Assets [Line Items]
Purchase price of regulatory assets	$ 23.3
Regulatory assets	$ 16.9
COVID-19
Regulatory Assets [Line Items]
Regulatory costs		29.8	29.8
CL&P
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved		159.8	135.9
Regulatory costs		65.6	52.8
Regulatory assets		1,982.6	1,907.8
CL&P | COVID-19
Regulatory Assets [Line Items]
Regulatory costs		11.8	11.8
NSTAR Electric
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved		26.7	19.8
Regulatory costs		9.6	3.5
Regulatory assets		1,828.6	1,714.4
NSTAR Electric | COVID-19
Regulatory Assets [Line Items]
Regulatory costs		2.2	2.2
PSNH
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved		1.2	1
Regulatory assets		$ 916.5	$ 696.2

REGULATORY ACCOUNTING - Compo_2

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,746,200	$ 4,821,100
Less:  Current Portion	724,413	890,786
Total Long-Term Regulatory Liabilities	4,021,830	3,930,305
EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,568,600	2,619,300
Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	680,800	670,600
Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	740,500	890,800
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	333,400	270,900
AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	117,600	98,200
Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	43,900	55,400
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	261,400	215,900
CL&P
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,464,200	1,599,400
Less:  Current Portion	155,901	336,048
Total Long-Term Regulatory Liabilities	1,308,284	1,263,396
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	973,400	983,600
CL&P | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	154,900	130,800
CL&P | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	205,400	361,000
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	46,100	34,500
CL&P | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	53,500	48,200
CL&P | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	500	700
CL&P | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	30,400	40,600
NSTAR Electric
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,003,600	1,921,300
Less:  Current Portion	416,046	373,221
Total Long-Term Regulatory Liabilities	1,587,567	1,548,081
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	915,200	944,300
NSTAR Electric | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	418,300	405,300
NSTAR Electric | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	345,200	336,100
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	166,800	139,700
NSTAR Electric | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	64,100	50,000
NSTAR Electric | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	21,400	31,400
NSTAR Electric | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	72,600	14,500
PSNH
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	505,600	553,600
Less:  Current Portion	114,561	161,963
Total Long-Term Regulatory Liabilities	391,013	391,628
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	341,600	348,600
PSNH | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	16,000	14,700
PSNH | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	108,400	155,000
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	34,700	28,800
PSNH | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	0	0
PSNH | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,900	$ 6,500

PROPERTY, PLANT AND EQUIPMENT_3

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	$ 19,238,300	$ 18,326,200
Distribution - Natural Gas	7,754,400	7,443,800
Transmission - Electric	14,233,100	13,709,300
Distribution - Water	2,203,600	2,112,600
Solar	200,800	200,800
Utility	43,630,200	41,792,700
Other	1,959,200	1,738,100
Property, Plant and Equipment, Gross	45,589,400	43,530,800
Less:  Accumulated Depreciation
Utility	(9,518,600)	(9,167,400)
Other	(823,000)	(706,100)
Total Accumulated Depreciation	(10,341,600)	(9,873,500)
Property, Plant and Equipment, Net	35,247,800	33,657,300
Construction Work in Progress	3,270,500	2,455,500
Total Property, Plant and Equipment, Net	38,518,294	36,112,820
CL&P
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	7,717,000	7,370,100
Transmission - Electric	6,345,800	6,165,100
Solar	0	0
Property, Plant and Equipment, Gross	14,062,800	13,535,200
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(2,659,000)	(2,567,100)
Property, Plant and Equipment, Net	11,403,800	10,968,100
Construction Work in Progress	632,200	498,900
Total Property, Plant and Equipment, Net	12,035,967	11,467,024
NSTAR Electric
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	8,816,500	8,410,000
Transmission - Electric	5,536,600	5,333,800
Solar	200,800	200,800
Property, Plant and Equipment, Gross	14,553,900	13,944,600
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(3,535,500)	(3,381,200)
Property, Plant and Equipment, Net	11,018,400	10,563,400
Construction Work in Progress	1,390,800	1,063,600
Total Property, Plant and Equipment, Net	12,409,156	11,626,968
PSNH
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	2,745,100	2,586,400
Transmission - Electric	2,352,400	2,212,000
Solar	0	0
Property, Plant and Equipment, Gross	5,097,500	4,798,400
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(974,200)	(912,300)
Property, Plant and Equipment, Net	4,123,300	3,886,100
Construction Work in Progress	309,700	174,100
Total Property, Plant and Equipment, Net	$ 4,433,033	$ 4,060,224

DERIVATIVE INSTRUMENTS - Gross

DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 3 - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current Derivative Assets
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	$ 16.9	$ 16.3
Netting	(0.5)	(0.5)
Net Amount Recorded as a Derivative	16.4	15.8
Other Long-Term Assets
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	17	28.8
Netting	(0.5)	(0.9)
Net Amount Recorded as a Derivative	16.5	27.9
Current Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(84.2)	(81.6)
Netting	0	0
Net Amount Recorded as a Derivative	(84.2)	(81.6)
Long-Term Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(85.3)	(143.9)
Netting	0	0
Net Amount Recorded as a Derivative	$ (85.3)	$ (143.9)

DERIVATIVE INSTRUMENTS - Narrat

DERIVATIVE INSTRUMENTS - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 MW	Dec. 31, 2022 $ / KWmo MW
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts by United Illuminated Company (in percent)	20%
Amount of power to be purchased under capacity-related contract (in MW) | MW	674	674
Level 3 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts (in percentage)	1.30%
Level 3 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts (in percentage)	5.50%
Level 3 | Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts (in percentage)	4.50%
CL&P
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts (in percent)	80%
CL&P | Level 3 | Minimum | Measurement Input, Forward Reserve
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input		0.44
CL&P | Level 3 | Maximum | Measurement Input, Forward Reserve
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input		0.50
CL&P | Level 3 | Weighted Average | Measurement Input, Forward Reserve
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input		0.47

DERIVATIVE INSTRUMENTS - Change

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives, Net [Rollforward]
Fair Value as of Beginning of Period	$ (152.1)	$ (213.3)	$ (181.8)	$ (249.2)
Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets	(1.5)	2.4	(1.6)	11.2
Settlements	17	15	46.8	42.1
Fair Value as of End of Period	$ (136.6)	$ (195.9)	$ (136.6)	$ (195.9)

MARKETABLE SECURITIES - Narrati

MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities				$ 20
Equity securities, realized gain		$ 1.1
Unrealized (loss) gain recorded in other income	$ 1.5		$ 10.6
Losses recorded on securities intended to be sold		15.3	5.8
Unrealized Gains/(Losses) on Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Losses recorded on securities intended to be sold		1.2	$ 0
CYAPC and YAEC
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities		168.3		170.1
Marketable securities held in nuclear decommissioning trust		$ 162.2		$ 163.2

MARKETABLE SECURITIES - Summary

MARKETABLE SECURITIES - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Amortized Cost	$ 173	$ 201.6
Pre-Tax Unrealized Gains	0.3	0.1
Pre-Tax Unrealized Losses	(11)	(16.2)
Fair Value	$ 162.3	$ 185.5

MARKETABLE SECURITIES - Contrac

MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Less than one year	$ 19
One to five years	29.9
Six to ten years	41.7
Greater than ten years	82.4
Amortized Cost	173	$ 201.6
Fair Value
Less than one year	19.4
One to five years	29.2
Six to ten years	39.9
Greater than ten years	73.8
Fair Value	$ 162.3	$ 185.5

MARKETABLE SECURITIES - Marketa

MARKETABLE SECURITIES - Marketable Securities Recorded at Fair Value on a Recurring Basis by Level (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 330.6	$ 375.6
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	184.5	215.5
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	146.1	160.1
Mutual Funds and Equities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	168.3	190.1
Money Market Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	16.2	25.4
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	86.1	82.3
Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	34.1	46.1
Asset-Backed Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	5.9	8.6
Municipal Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	9.3	12.7
Other Fixed Income Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 10.7	$ 10.4

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Jun. 07, 2023	Dec. 31, 2022
CL&P
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	$ 213,400,000		$ 0
CL&P | Related Party
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	213,400,000
PSNH
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	100,000		173,300,000
PSNH | Related Party
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	100,000		173,300,000
Line of Credit | CL&P
Line of Credit Facility [Line Items]
Maximum borrowing capacity	375,000,000
Amount outstanding under line of credit	0
Line of Credit | PSNH
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000
Amount outstanding under line of credit	0
Line of Credit | Yankee Gas
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 350,000,000
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 (in years)	5 years
NSTAR Electric | Line of Credit | NSTAR Electric
Line of Credit Facility [Line Items]
Debt instrument term (in years)	5 years

SHORT-TERM AND LONG-TERM DEBT_2

SHORT-TERM AND LONG-TERM DEBT - Borrowings Outstanding and Available under the Commercial Paper Programs (Details) - Commercial Paper - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings outstanding	$ 1,320.3	$ 1,442.2
Available borrowing capacity	$ 679.7	$ 557.8
Weighted-average interest rate (in percent)	5.53%	4.63%
NSTAR Electric
Debt Instrument [Line Items]
Borrowings outstanding	$ 209.5	$ 0
Available borrowing capacity	$ 440.5	$ 650
Weighted-average interest rate (in percent)	5.35%	0%

SHORT-TERM AND LONG-TERM DEBT_3

SHORT-TERM AND LONG-TERM DEBT - Summary of Long-Term Debt Issuance and Repayments (Details) - USD ($) $ in Thousands	1 Months Ended							9 Months Ended
	Nov. 30, 2023	Sep. 30, 2023	Aug. 31, 2023	Jul. 31, 2023	May 31, 2023	Mar. 31, 2023	Jan. 31, 2023	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Retirement of Long-Term Debt								$ (1,203,000)	$ (775,000)
CL&P
Debt Instrument [Line Items]
Retirement of Long-Term Debt								$ (400,000)	$ 0
CL&P | First Mortgage | CL&P 2023 Series A First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)							5.25%
Issuances							$ 500,000
CL&P | First Mortgage | CL&P 2013 Series A First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)							2.50%
Retirement of Long-Term Debt							$ (400,000)
CL&P | First Mortgage | CL&P 2023 Series B First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)				4.90%
Issuances				$ 300,000
PSNH | First Mortgage | PSNH Series W First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)							5.15%
Issuances							$ 300,000
PSNH | First Mortgage | PSNH Series X First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)		5.35%						5.35%
Issuances		$ 300,000
PSNH | First Mortgage | PSNH Series S First Mortgage Bonds | Subsequent Event | Forecast
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	3.50%
Retirement of Long-Term Debt	$ (325,000)
Yankee Gas | First Mortgage | Yankee Gas Series V First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)			5.51%
Issuances			$ 170,000
Aquarion Water Company Of Connecticut | Senior Notes | Aquarion Water Company of Connecticut Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)		5.89%						5.89%
Issuances		$ 50,000
NSTAR Electric | Debentures | NSTAR Electric 2023 Debentures
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)		5.60%						5.60%
Issuances		$ 150,000
Eversource Parent | Senior Notes | Eversource Parent Series Z Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)					5.45%	5.45%
Issuances					$ 550,000	$ 750,000
Eversource Parent | Senior Notes | Eversource Parent Series F Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)					2.80%
Retirement of Long-Term Debt					$ (450,000)
Eversource Parent | Senior Notes | Eversource Parent Series AA Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)					4.75%
Issuances					$ 450,000
Eversource Parent | Senior Notes | Eversource Parent Series BB Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)					5.125%
Issuances					$ 800,000
Eversource Parent | Senior Notes | Eversource Parent Variable Rate Series T Senior Notes
Debt Instrument [Line Items]
Retirement of Long-Term Debt			$ (350,000)
Eversource Parent | Senior Notes | Eversource Parent Variable Rate Series T Senior Notes | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)			0.25%

RATE REDUCTION BONDS AND VARI_3

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Narrative (Details) - PSNH - Rate Reduction Bonds $ in Millions	May 31, 2018 USD ($)
Debt Instrument [Line Items]
Amount of securitized rate reduction bonds issued	$ 635.7
Weighted average interest rate (in percent)	3.66%

RATE REDUCTION BONDS AND VARI_4

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES - Summary of the Impact of Funding on the Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	$ 5,856,600	$ 5,578,300
Regulatory Liabilities	4,021,830	3,930,305
Accrued Interest (included in Other Current Liabilities)	1,108,178	989,053
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	367,282	410,492
Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	403,300	435,700
Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	296,500	322,500
Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	68,400	102,200
Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	17,500	19,600
PSNH
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	916,500	696,200
Regulatory Liabilities	391,013	391,628
Accrued Interest (included in Other Current Liabilities)	83,046	59,616
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	367,282	410,492
PSNH | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Rate Reduction Bonds - Current Portion	43,200	43,200
Rate Reduction Bonds - Long-Term Portion	367,300	410,500
PSNH | Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	403,300	435,700
PSNH | Securitized Stranded Costs | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	403,300	435,700
PSNH | Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	9,000	14,400
PSNH | Other Regulatory Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Regulatory Liabilities	6,700	6,000
Accrued Interest (included in Other Current Liabilities)	2,500	6,900
PSNH | Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,200	33,100
PSNH | Current Derivative Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	16,600	32,400
PSNH | Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	3,200	3,200
PSNH | Other Long-Term Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	$ 3,200	$ 3,200

RATE REDUCTION BONDS AND VARI_5

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Condensed Income Statements, Captions [Line Items]
Interest Expense on RRB Principal (included in Interest Expense)	$ 222,283	$ 178,174	$ 624,140	$ 491,509
PSNH
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	9,963	(7,398)	35,234	(43,449)
Interest Expense on RRB Principal (included in Interest Expense)	19,252	15,030	55,901	43,432
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)	$ 3,900	$ 4,200	$ 11,900	$ 12,900

PENSION BENEFITS AND POSTRETI_3

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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 10.7	$ 17.5	$ 32.4	$ 52.7
Interest Cost	63.4	38.6	190.6	115.8
Expected Return on Plan Assets	(116.3)	(130.7)	(348.7)	(393.1)
Actuarial Loss	10.9	28.4	35	87.5
Prior Service Cost/(Credit)	0.3	0.4	0.9	1.1
Settlement Loss	8.7		12.4
Total Net Periodic Benefit Plan Income	(22.3)	(45.8)	(77.4)	(136)
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.9	2.9	5.7	8.7
Interest Cost	8.5	5	25.4	15.1
Expected Return on Plan Assets	(19.3)	(22.5)	(57.9)	(67.5)
Actuarial Loss	0	0	0	0
Prior Service Cost/(Credit)	(5.4)	(5.4)	(16.2)	(16.2)
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(14.3)	(20)	(43)	(59.9)
CL&P | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3.1	4.7	9.2	13.9
Interest Cost	12.6	7.8	37.9	23.4
Expected Return on Plan Assets	(23.5)	(26.5)	(70.6)	(79.6)
Actuarial Loss	0.5	4	1.9	12.2
Prior Service Cost/(Credit)	0	0	0	0
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(7.3)	(10)	(21.6)	(30.1)
Intercompany Expense/(Income) Allocations	0.8	(4)	(1.8)	(11.9)
CL&P | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.4	0.5	1	1.5
Interest Cost	1.5	0.9	4.6	2.7
Expected Return on Plan Assets	(2.3)	(2.8)	(7)	(8.4)
Actuarial Loss	0	0	0	0
Prior Service Cost/(Credit)	0.2	0.3	0.8	0.8
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(0.2)	(1.1)	(0.6)	(3.4)
Intercompany Expense/(Income) Allocations	(0.5)	(0.9)	(1.4)	(2.7)
NSTAR Electric | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.9	3.4	5.9	10.4
Interest Cost	13.5	8.2	40.5	24.5
Expected Return on Plan Assets	(28.4)	(32.1)	(85.3)	(96.2)
Actuarial Loss	4	8.1	12.9	24.7
Prior Service Cost/(Credit)	0.1	0.1	0.3	0.3
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(8.9)	(12.3)	(25.7)	(36.3)
Intercompany Expense/(Income) Allocations	0.9	(3.2)	(1.2)	(9.3)
NSTAR Electric | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.5	0.9	1.5
Interest Cost	2.3	1.3	6.9	3.9
Expected Return on Plan Assets	(9.2)	(10.6)	(27.7)	(31.8)
Actuarial Loss	0	0	0	0
Prior Service Cost/(Credit)	(4.2)	(4.2)	(12.7)	(12.7)
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(10.8)	(13)	(32.6)	(39.1)
Intercompany Expense/(Income) Allocations	(0.5)	(0.9)	(1.6)	(2.7)
PSNH | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1	1.7	3.2	5.2
Interest Cost	6.8	4.2	20.4	12.6
Expected Return on Plan Assets	(12.3)	(14)	(37.1)	(42.1)
Actuarial Loss	0.4	1.9	1.2	6
Prior Service Cost/(Credit)	0	0	0	0
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(4.1)	(6.2)	(12.3)	(18.3)
Intercompany Expense/(Income) Allocations	0.3	(1)	(0.3)	(2.7)
PSNH | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.2	0.3	0.6	0.8
Interest Cost	0.9	0.5	2.7	1.6
Expected Return on Plan Assets	(1.4)	(1.7)	(4.2)	(5)
Actuarial Loss	0	0	0	0
Prior Service Cost/(Credit)	0.1	0.1	0.3	0.3
Settlement Loss	0		0
Total Net Periodic Benefit Plan Income	(0.2)	(0.8)	(0.6)	(2.3)
Intercompany Expense/(Income) Allocations	$ (0.2)	$ (0.3)	$ (0.5)	$ (0.9)

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Environmental Sites and Related Reserves (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) site	Dec. 31, 2022 USD ($) site
Site Contingency [Line Items]
Number of Sites | site	63	59
Reserve | $	$ 130.5	$ 122.6
CL&P
Site Contingency [Line Items]
Number of Sites | site	14	13
Reserve | $	$ 12.6	$ 13.9
NSTAR Electric
Site Contingency [Line Items]
Number of Sites | site	12	10
Reserve | $	$ 5.4	$ 3.4
PSNH
Site Contingency [Line Items]
Number of Sites | site	8	8
Reserve | $	$ 7.7	$ 6.1

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) $ in Millions	Sep. 30, 2023 USD ($) site	Dec. 31, 2022 USD ($)
Site Contingency [Line Items]
Number of environmental sites | site	2
Reserve balance	$ 130.5	$ 122.6
MGP Sites
Site Contingency [Line Items]
Reserve balance	$ 120.5	$ 112.6

COMMITMENTS AND CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Fair value of guarantees	$ 4.4	$ 4.2

COMMITMENTS AND CONTINGENCIES_4

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jan. 31, 2022 USD ($) letterOfCredit	Sep. 16, 2020 USD ($)
Guarantor Obligations [Line Items]
Number of letters of credit | letterOfCredit			2
Letters of Credit | Eversource Investment LLC
Guarantor Obligations [Line Items]
Long-term debt and long term borrowing limit approved by regulatory agency				$ 25
North East Offshore
Guarantor Obligations [Line Items]
Ownership interest (percent)	50%
Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,060
Ownership interest (percent)	50%
Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 546.4
Ownership interest (percent)	50%
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 7.1
Ownership interest (percent)	50%
Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 110
South Fork Class B Member, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 499.5
Ownership interest (percent)	50%
Sunrise Wind LLC | Letters of Credit
Guarantor Obligations [Line Items]
Amount outstanding under line of credit		$ 9.9
Revolution Wind, LLC | Letters of Credit
Guarantor Obligations [Line Items]
Amount outstanding under line of credit	$ 1
South Fork Wind, LLC | Letters of Credit
Guarantor Obligations [Line Items]
Amount outstanding under line of credit			$ 4.3
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 161
Ownership interest (percent)	50%
Construction-related purchase agreements with third-party contractors | North East Offshore
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 705.8
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	823.3
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	381.1
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	55.5
Indemnification Agreement | Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	29.8
Indemnification Agreement | Eversource Investment LLC | North East Offshore
Guarantor Obligations [Line Items]
Maximum exposure (up to)	910
Indemnification Agreement | Eversource Investment LLC | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	77.4
Indemnification Agreement | South Fork Class B Member, LLC | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	77.4
Power Purchase Agreement | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	7.1
OREC capacity production | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 15.4
Ownership interest (percent)	50%
OREC capacity production | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 11
Real estate purchase | Bay State Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	2.5
Transmission interconnection | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	1.2
Letters of Credit | Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	15.2
South Fork Wind Tax Equity | Eversource TEI LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	528.4
South Fork Wind Tax Equity | Eversource TEI LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	0
Surety bonds | Various
Guarantor Obligations [Line Items]
Maximum exposure (up to)	38.8
Lease payments for real estate | Eversource Service
Guarantor Obligations [Line Items]
Maximum exposure (up to)	0.3
Performance guarantee | North East Offshore
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,300
Percent of obligations guaranteed (in percent)	50%
Payment guarantee | North East Offshore
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 62.5
Percent of obligations guaranteed (in percent)	50%

COMMITMENTS AND CONTINGENCIES_5

COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations - Yankee Companies (Details) - Yankee Companies - USD ($) $ in Millions	Jun. 08, 2022	Mar. 25, 2021
Loss Contingencies [Line Items]
Damages sought	$ 33.1
CYAPC, YAEC, and MYAPC
Loss Contingencies [Line Items]
Damages sought		$ 120.4

COMMITMENTS AND CONTINGENCIES_6

COMMITMENTS AND CONTINGENCIES - FERC ROE Complaints (Details) $ in Millions			9 Months Ended	36 Months Ended
	Apr. 29, 2016 complaint	Oct. 16, 2014	Sep. 30, 2023 USD ($) period	Oct. 15, 2014	Dec. 31, 2022 USD ($)	Dec. 23, 2019 complaint	Nov. 21, 2019 complaint	Oct. 16, 2018 complaint	Jul. 31, 2014 complaint
Loss Contingencies [Line Items]
Percentage of base ROE reasonably justified (in percent)			10.41%
Percentage of incentive cap on total ROE (in percent)			13.08%
FERC ROE Complaints
Loss Contingencies [Line Items]
Number of complaints filed | complaint	4					4	2	4
Period of complaint			15 months
Basis point change			0.10%
Estimate of possible loss for each 10 basis point change to base ROE			$ 3
Number of complain periods | period			4
FERC ROE First, Second and Third Complaints
Loss Contingencies [Line Items]
Number of complaints filed | complaint									3
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 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

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
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	367,282	410,492
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	24,159,100	21,044,100
Rate Reduction Bonds	410,500	453,700
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Preferred Stock Not Subject to Mandatory Redemption	118,000	136,700
Long-Term Debt	21,260,500	18,891,300
Rate Reduction Bonds	381,600	424,700
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	4,606,800	4,216,500
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	87,200	99,200
Long-Term Debt	4,025,300	3,828,300
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	4,576,500	4,425,100
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	30,800	37,500
Long-Term Debt	4,071,100	4,091,800
Rate Reduction Bonds	0	0
PSNH
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Rate Reduction Bonds	367,282	410,492
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	1,756,600	1,164,600
Rate Reduction Bonds	410,500	453,700
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	1,483,400	970,500
Rate Reduction Bonds	$ 381,600	$ 424,700

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications							$ 100	$ (4,500)
Amounts Reclassified from AOCI							15,300	5,800
Other Comprehensive Income, Net of Tax	$ 8,081	$ 4,088	$ 3,230	$ 1,858	$ (1,293)	$ 704	15,399	1,269
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period			(39,400)			(42,300)	(39,400)	(42,300)
Other Comprehensive Income, Net of Tax	8,081	$ 4,088	3,230	1,858	$ (1,293)	704
Balance as of End of Period	(24,000)			(41,000)			(24,000)	(41,000)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period			(400)			(400)	(400)	(400)
OCI Before Reclassifications							0	0
Amounts Reclassified from AOCI							0	0
Other Comprehensive Income, Net of Tax							0	0
Balance as of End of Period	(400)			(400)			(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period			(1,200)			400	(1,200)	400
OCI Before Reclassifications							0	(2,000)
Amounts Reclassified from AOCI							1,200	0
Other Comprehensive Income, Net of Tax							1,200	(2,000)
Balance as of End of Period	0			(1,600)			0	(1,600)
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Balance as of Beginning of Period			$ (37,800)			$ (42,300)	(37,800)	(42,300)
OCI Before Reclassifications							100	(2,500)
Amounts Reclassified from AOCI							14,100	5,800
Other Comprehensive Income, Net of Tax							14,200	3,300
Balance as of End of Period	$ (23,600)			$ (39,000)			$ (23,600)	$ (39,000)

COMMON SHARES - Common Shares A

COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares	Sep. 30, 2023	May 03, 2023	May 02, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022
Class of Stock [Line Items]
Par value (in dollars per share)	$ 5			$ 5	$ 5	$ 5
Authorized (in shares)	410,000,000	410,000,000	380,000,000	380,000,000
Issued (in shares)	359,984,073			359,984,073
CL&P
Class of Stock [Line Items]
Par value (in dollars per share)	$ 10			$ 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			$ 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			$ 1
Authorized (in shares)	100,000,000			100,000,000
Issued (in shares)	301			301

COMMON SHARES - Narrative (Deta

COMMON SHARES - Narrative (Details) - shares	Sep. 30, 2023	May 03, 2023	May 02, 2023	Dec. 31, 2022
Equity [Abstract]
Treasury stock, common (in shares)	10,708,298			11,540,218
Common stock outstanding (in shares)	349,275,775			348,443,855
Authorized (in shares)	410,000,000	410,000,000	380,000,000	380,000,000

COMMON SHAREHOLDERS' EQUITY A_2

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Dividends on preferred stock	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880	$ 1,880
Noncontrolling interest attributed to preferred stock of subsidiaries	155,570						$ 155,570		$ 155,570
CL&P and NSTAR
Noncontrolling Interest [Line Items]
Dividends on preferred stock	$ 1,900			$ 1,900			$ 5,600	$ 5,600

EARNINGS PER SHARE - Narrative

EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Antidilutive share awards excluded from the EPS computation (in shares)	0	0	0	0

EARNINGS PER SHARE - Components

EARNINGS PER SHARE - Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Income Attributable to Common Shareholders	$ 339,663	$ 349,409	$ 846,245	$ 1,084,717
Net Income Attributable to Common Shareholders	$ 339,700	$ 349,400	$ 846,200	$ 1,084,700
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,704,155	347,297,411	349,461,219	346,115,823
Dilutive effect (in shares)	147,814	465,282	270,101	457,278
Diluted (in shares)	349,851,969	347,762,693	349,731,320	346,573,101
Basic EPS (in dollars per share)	$ 0.97	$ 1.01	$ 2.42	$ 3.13
Diluted EPS (in dollars per share)	$ 0.97	$ 1	$ 2.42	$ 3.13

REVENUES (Details)

REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2021	Sep. 01, 2021
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,833,500	$ 3,259,400	$ 9,211,000	$ 9,273,000
Alternative Revenue Programs	(48,200)	(46,600)	(14,000)	(22,700)
Other Revenues	6,200	2,800	19,500	9,300
Operating Revenues	2,791,482	3,215,645	9,216,467	9,259,596
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			0	(72,041)
CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	1,190,096	1,369,101	3,563,150	3,690,614
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			0	(72,041)
CL&P | Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Loss contingency, estimate of possible earnings impact, non-compliance with performance standards						$ 28,400
CL&P | Unfavorable Regulatory Action | Sales
Disaggregation of Revenue [Line Items]
Customer Credits Distributed in 2022 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty					$ 65,000
NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	953,531	1,105,452	2,728,782	2,752,278
PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	353,074	430,642	1,123,300	1,077,124
Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,441,000	2,752,600	8,129,800	7,799,600
Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,503,600	1,633,300	4,952,700	4,663,000
Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	816,300	984,000	2,778,100	2,718,600
Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	121,100	135,300	399,000	418,000
Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	133,600	133,900	342,600	333,100
Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	227,600	340,900	647,800	987,300
Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	31,300	25,100	90,800	81,300
Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		6,900		71,700
Operating Segments | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,396,200	1,589,900	3,972,200	4,111,400
Alternative Revenue Programs	(49,300)	(65,100)	28,000	28,300
Other Revenues	2,400	200	7,100	500
Operating Segments | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,129,200	1,268,500	3,194,500	3,181,700
Alternative Revenue Programs	(29,000)	(20,500)	(43,500)	(14,400)
Other Revenues	1,900	1,800	6,300	5,400
Operating Segments | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	411,000	497,000	1,247,700	1,227,400
Alternative Revenue Programs	900	(7,200)	32,400	8,800
Other Revenues	700	600	2,300	2,100
Operating Segments | Total Retail Tariff Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,029,300	1,092,200	3,000,700	2,784,500
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	901,800	1,016,500	2,535,400	2,471,800
Operating Segments | Total Retail Tariff Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	303,800	381,000	959,700	929,700
Operating Segments | Residential | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	703,900	739,100	2,059,900	1,864,400
Operating Segments | Residential | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	480,500	507,600	1,318,700	1,239,000
Operating Segments | Residential | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	191,500	246,200	603,500	580,500
Operating Segments | Commercial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	286,400	311,200	836,700	808,700
Operating Segments | Commercial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	389,400	469,600	1,121,000	1,128,800
Operating Segments | Commercial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	88,700	110,400	287,500	280,500
Operating Segments | Industrial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	39,000	41,900	104,100	111,400
Operating Segments | Industrial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	31,900	39,300	95,700	104,000
Operating Segments | Industrial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	23,600	24,400	68,700	68,700
Operating Segments | Wholesale Transmission Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	245,100	250,300	613,300	575,200
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	186,400	183,800	521,000	512,700
Operating Segments | Wholesale Transmission Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	88,700	86,200	223,900	213,100
Operating Segments | Wholesale Market Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	112,800	232,900	330,400	656,300
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	28,600	57,500	102,100	163,100
Operating Segments | Wholesale Market Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	13,500	26,700	51,900	75,800
Operating Segments | Other Revenues from Contracts with Customers | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	7,700	7,500	24,700	22,800
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	12,400	10,700	36,000	34,100
Operating Segments | Other Revenues from Contracts with Customers | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	5,000	3,100	12,200	8,800
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,300	7,000	3,100	72,600
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Operating Segments | Amortization Of (Reserves For) Revenues Subject To Refund | CL&P | Unfavorable Regulatory Action
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers					$ 93,400
Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	394,700	343,500	1,217,300	1,062,700
Alternative Revenue Programs	0	0	0	0
Other Revenues	0	0	0	0
Operating Revenues	394,700	343,500	1,217,300	1,062,700
Other | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
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 | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	29,900	0	79,400
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	394,700	313,600	1,217,300	983,300
Other | Amortization of/(Reserve for) 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	(784,900)	(735,100)	(2,244,300)	(2,041,200)
Alternative Revenue Programs	31,900	52,600	(50,800)	(46,900)
Other Revenues	0	0	0	0
Operating Revenues	(753,000)	(682,500)	(2,295,100)	(2,088,100)
Eliminations | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(5,900)	(6,900)	(18,000)	(19,000)
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	(1,100)	(1,700)	(3,400)	(4,200)
Eliminations | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(4,800)	(5,200)	(14,600)	(14,800)
Eliminations | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(386,600)	(416,300)	(1,015,600)	(1,047,300)
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	(392,400)	(311,900)	(1,210,700)	(974,900)
Eliminations | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0		0
Consolidations Eliminations | CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	(159,200)	(155,900)	(444,100)	(449,600)
Consolidations Eliminations | NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	(148,600)	(144,300)	(428,500)	(420,400)
Consolidations Eliminations | PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	(59,500)	(59,800)	(159,100)	(161,200)
Electric Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,410,300	2,830,400	7,039,800	7,204,500
Alternative Revenue Programs	(43,800)	(37,700)	(40,700)	(26,200)
Other Revenues	4,800	2,400	15,200	7,500
Operating Revenues	2,371,300	2,795,100	7,014,300	7,185,800
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,234,500	2,489,000	6,495,300	6,184,000
Electric Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,375,900	1,492,900	3,982,100	3,683,900
Electric Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	764,100	890,500	2,244,700	2,216,000
Electric Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	94,500	105,600	268,500	284,100
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	154,900	317,100	484,400	895,200
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	20,900	17,300	60,100	53,400
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		7,000		71,900
Natural Gas Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	219,800	228,300	1,647,700	1,564,200
Alternative Revenue Programs	(2,400)	(2,800)	21,900	4,300
Other Revenues	900	100	3,000	900
Operating Revenues	218,300	225,600	1,672,600	1,569,400
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	146,900	205,000	1,483,300	1,472,100
Natural Gas Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	83,000	94,700	858,000	870,000
Natural Gas Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	33,700	76,700	483,600	456,900
Natural Gas Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	30,200	33,600	141,700	145,200
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	71,600	22,700	160,500	89,300
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,300	600	3,900	2,800
Natural Gas Distribution | Operating Segments | Amortization of/(Reserve for) 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	525,000	523,700	1,372,300	1,312,200
Alternative Revenue Programs	(33,600)	(55,100)	57,600	48,900
Other Revenues	200	200	500	500
Operating Revenues	491,600	468,800	1,430,400	1,361,600
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 | 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 | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	520,200	520,300	1,358,200	1,301,000
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	4,800	3,400	14,100	10,500
Electric Transmission | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0		700
Water Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	68,600	68,600	178,200	170,600
Alternative Revenue Programs	(300)	(3,600)	(2,000)	(2,800)
Other Revenues	300	100	800	400
Operating Revenues	68,600	65,100	177,000	168,200
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	65,500	65,500	169,200	162,500
Water Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	44,700	45,700	112,600	109,100
Water Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	19,600	18,500	53,200	49,900
Water Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,200	1,300	3,400	3,500
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	2,900	2,800
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,000	2,100	$ 6,100	6,200
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ (100)		$ (900)

SEGMENT INFORMATION - Narrative

SEGMENT INFORMATION - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) reportableSegment
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
Related Party
Segment Reporting Information [Line Items]
Amount of natural gas transmission purchased | $	$ 77.7

SEGMENT INFORMATION - Summary o

SEGMENT INFORMATION - Summary of Segment Information and Segmented Total Assets (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues	$ 2,791,482		$ 3,215,645	$ 9,216,467	$ 9,259,596
Depreciation and Amortization	(185,500)		(413,400)	(524,000)	(1,304,400)
Other Operating Expenses	(2,075,400)		(2,244,900)	(6,851,700)	(6,279,300)
Operating Income/(Loss)	530,553		557,293	1,840,787	1,675,917
Interest Expense	(222,283)		(178,174)	(624,140)	(491,509)
Impairment of Offshore Wind Investment	0	$ (401,000)	0	(401,000)	0
Other Income, Net	79,123		89,831	262,980	255,253
Net Income/(Loss) Attributable to Common Shareholders	339,663		349,409	846,245	1,084,717
Cash Flows Used for Investments in Plant				3,125,617	2,352,743
Assets	56,293,343			56,293,343		$ 53,230,900
Other
Segment Reporting Information [Line Items]
Operating Revenues	394,700		343,500	1,217,300	1,062,700
Depreciation and Amortization	(40,700)		(35,400)	(115,500)	(98,800)
Other Operating Expenses	(315,700)		(265,700)	(992,600)	(876,500)
Operating Income/(Loss)	38,300		42,400	109,200	87,400
Interest Expense	(111,400)		(69,600)	(297,000)	(169,900)
Impairment of Offshore Wind Investment				(401,000)
Other Income, Net	415,900		429,900	1,082,600	1,280,100
Net Income/(Loss) Attributable to Common Shareholders	397,000		379,000	621,600	1,163,600
Cash Flows Used for Investments in Plant				207,100	177,600
Assets	29,019,000			29,019,000		26,365,200
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(753,000)		(682,500)	(2,295,100)	(2,088,100)
Depreciation and Amortization	2,300		1,800	6,600	5,100
Other Operating Expenses	751,200		681,100	2,290,000	2,081,900
Operating Income/(Loss)	500		400	1,500	(1,100)
Interest Expense	38,400		20,000	104,800	46,300
Impairment of Offshore Wind Investment				0
Other Income, Net	(412,700)		(423,000)	(1,038,000)	(1,251,500)
Net Income/(Loss) Attributable to Common Shareholders	(373,800)		(402,600)	(931,700)	(1,206,300)
Cash Flows Used for Investments in Plant				0	0
Assets	(27,549,600)			(27,549,600)		(24,737,500)
Electric Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	2,371,300		2,795,100	7,014,300	7,185,800
Depreciation and Amortization	(700)		(256,900)	59,300	(806,700)
Other Operating Expenses	(2,124,000)		(2,261,500)	(6,371,400)	(5,743,200)
Operating Income/(Loss)	246,600		276,700	702,200	635,900
Interest Expense	(76,800)		(64,500)	(214,400)	(184,200)
Impairment of Offshore Wind Investment				0
Other Income, Net	53,500		59,600	155,700	160,100
Net Income/(Loss) Attributable to Common Shareholders	173,300		225,100	504,300	495,000
Cash Flows Used for Investments in Plant				1,230,300	823,900
Assets	28,840,900			28,840,900		27,365,000
Natural Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	218,300		225,600	1,672,600	1,569,400
Depreciation and Amortization	(38,000)		(25,100)	(156,700)	(116,200)
Other Operating Expenses	(211,100)		(226,300)	(1,280,800)	(1,244,300)
Operating Income/(Loss)	(30,800)		(25,800)	235,100	208,900
Interest Expense	(19,700)		(18,800)	(62,400)	(51,200)
Impairment of Offshore Wind Investment				0
Other Income, Net	9,200		11,100	27,900	31,900
Net Income/(Loss) Attributable to Common Shareholders	(33,700)		(24,600)	148,200	147,200
Cash Flows Used for Investments in Plant				536,800	424,500
Assets	8,404,500			8,404,500		8,084,900
Electric Transmission | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	491,600		468,800	1,430,400	1,361,600
Depreciation and Amortization	(94,500)		(85,100)	(276,400)	(250,300)
Other Operating Expenses	(144,900)		(143,700)	(409,400)	(414,300)
Operating Income/(Loss)	252,200		240,000	744,600	697,000
Interest Expense	(43,000)		(36,600)	(126,700)	(107,300)
Impairment of Offshore Wind Investment				0
Other Income, Net	11,900		10,100	30,800	28,300
Net Income/(Loss) Attributable to Common Shareholders	160,300		155,800	476,400	455,800
Cash Flows Used for Investments in Plant				1,011,300	823,300
Assets	14,693,400			14,693,400		13,369,500
Water Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	68,600		65,100	177,000	168,200
Depreciation and Amortization	(13,900)		(12,700)	(41,300)	(37,500)
Other Operating Expenses	(30,900)		(28,800)	(87,500)	(82,900)
Operating Income/(Loss)	23,800		23,600	48,200	47,800
Interest Expense	(9,800)		(8,700)	(28,400)	(25,200)
Impairment of Offshore Wind Investment				0
Other Income, Net	1,300		2,100	4,000	6,400
Net Income/(Loss) Attributable to Common Shareholders	16,600		$ 16,700	27,400	29,400
Cash Flows Used for Investments in Plant				140,100	$ 103,400
Assets	$ 2,885,100			$ 2,885,100		$ 2,783,800