The Connecticut Light and Power Company (CNLPM) 10-Q 5 May 23 2023 Q1 Quarterly report Financial data

COVER PAGE

COVER PAGE - shares	3 Months Ended
	Mar. 31, 2023	Apr. 30, 2023
Document And Entity [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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)		348,841,840
Entity Central Index Key	0000072741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
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	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 35,975	$ 47,597
Cash Equivalents	0	327,006
Receivables, Net (net of allowance for uncollectible accounts)	1,660,076	1,517,138
Unbilled Revenues	216,715	238,968
Materials, Supplies, Natural Gas and REC Inventory	423,343	374,395
Regulatory Assets	1,332,028	1,335,491
Prepayments and Other Current Assets	468,292	382,603
Total Current Assets	4,136,429	4,223,198
Property, Plant and Equipment, Net	36,744,855	36,112,820
Deferred Debits and Other Assets:
Regulatory Assets	4,407,875	4,242,794
Goodwill	4,522,632	4,522,632
Investments in Unconsolidated Affiliates	2,302,880	2,176,080
Prepaid Pension and PBOP	1,097,814	1,045,524
Marketable Securities	332,050	366,508
Other Long-Term Assets	560,632	541,344
Total Deferred Debits and Other Assets	13,223,883	12,894,882
Total Assets	54,105,167	53,230,900
Current Liabilities:
Notes Payable	1,195,500	1,442,200
Long-Term Debt – Current Portion	1,615,461	1,320,129
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,821,911	2,113,905
Regulatory Liabilities	650,538	890,786
Other Current Liabilities	1,078,421	989,053
Total Current Liabilities	6,405,041	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,239,443	5,067,902
Regulatory Liabilities	3,974,374	3,930,305
Derivative Liabilities	124,281	143,929
Asset Retirement Obligations	500,695	502,713
Accrued Pension, SERP and PBOP	120,200	135,473
Other Long-Term Liabilities	884,717	888,081
Total Deferred Credits and Other Liabilities	10,843,710	10,668,403
Long-Term Debt	20,562,588	19,723,994
Rate Reduction Bonds	388,887	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	8,412,085	8,401,731
Retained Earnings	5,782,958	5,527,153
Accumulated Other Comprehensive Loss	(36,191)	(39,421)
Treasury Stock	(209,401)	(216,225)
Common Shareholders' Equity	15,749,371	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	$ 54,105,167	$ 53,230,900

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for uncollectible accounts	$ 535,114	$ 486,297

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Operating Revenues	$ 3,795,643	$ 3,471,310
Operating Expenses:
Purchased Power, Purchased Natural Gas and Transmission	1,903,246	1,389,696
Operations and Maintenance	454,562	472,433
Depreciation	312,955	289,330
Amortization	(76,059)	236,948
Energy Efficiency Programs	222,952	199,484
Taxes Other Than Income Taxes	228,414	220,364
Total Operating Expenses	3,046,070	2,808,255
Operating Income/(Loss)	749,573	663,055
Interest Expense	194,543	153,245
Other Income, Net	88,981	71,561
Income Before Income Tax Expense	644,011	581,371
Income Tax Expense	150,972	136,045
Net Income	493,039	445,326
Net Income Attributable to Noncontrolling Interests	1,880	1,880
Net Income Attributable to Common Shareholders	$ 491,159	$ 443,446
Basic EPS (in dollars per share)	$ 1.41	$ 1.28
Diluted EPS (in dollars per share)	$ 1.41	$ 1.28
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,217,147	345,156,346
Diluted (in shares)	349,612,013	345,661,133

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 493,039	$ 445,326
Other Comprehensive Income, Net of Tax:
Qualified Cash Flow Hedging Instruments	5	5
Changes in Unrealized Gains/(Losses) on Marketable Securities	1,254	(817)
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	1,971	1,516
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Comprehensive Income Attributable to Noncontrolling Interests	(1,880)	(1,880)
Comprehensive Income Attributable to Common Shareholders	$ 494,389	$ 444,150

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, 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	348,808,082
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	$ 8,412,085	$ 5,782,958	$ (36,191)	$ (209,401)

CONDENSED CONSOLIDATED STATEM_4

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

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 493,039	$ 445,326
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	312,955	289,330
Deferred Income Taxes	149,197	67,557
Uncollectible Expense	22,821	17,135
Pension, SERP and PBOP Income, Net	(24,563)	(40,642)
Pension Contributions	(1,100)	(26,100)
Regulatory Under Recoveries, Net	(158,964)	(107,767)
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
Amortization	(76,059)	236,948
Cost of Removal Expenditures	(70,514)	(61,660)
Other	(54,486)	(21,409)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(225,609)	(291,723)
Taxes Receivable/Accrued, Net	284	56,519
Accounts Payable	(258,476)	(68,909)
Other Current Assets and Liabilities, Net	(39,368)	(64,253)
Net Cash Flows (Used In)/Provided by Operating Activities	69,157	371,940
Investing Activities:
Investments in Property, Plant and Equipment	(977,144)	(764,594)
Proceeds from Sales of Marketable Securities	64,307	90,409
Purchases of Marketable Securities	(56,508)	(76,182)
Investments in Unconsolidated Affiliates	(87,845)	(113,856)
Other Investing Activities	5,640	5,976
Net Cash Flows Used in Investing Activities	(1,051,550)	(858,247)
Financing Activities:
Cash Dividends on Common Shares	(229,405)	(213,890)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
(Decrease)/Increase in Notes Payable	(246,700)	163,350
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
Issuance of Long-Term Debt	1,550,000	1,300,000
Retirement of Long-Term Debt	(400,000)	(770,000)
Other Financing Activities	(27,002)	(26,087)
Net Cash Flows (Used in)/Provided by Financing Activities	623,408	429,888
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(358,985)	(56,419)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	$ 162,767	$ 164,589

THE CONNECTICUT LIGHT AND POWER

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 35,975	$ 47,597
Receivables, Net (net of allowance for uncollectible accounts)	1,660,076	1,517,138
Unbilled Revenues	216,715	238,968
Materials, Supplies, Natural Gas and REC Inventory	423,343	374,395
Regulatory Assets	1,332,028	1,335,491
Prepayments and Other Current Assets	468,292	382,603
Total Current Assets	4,136,429	4,223,198
Property, Plant and Equipment, Net	36,744,855	36,112,820
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,407,875	4,242,794
Prepaid Pension	1,097,814	1,045,524
Other Long-Term Assets	560,632	541,344
Total Deferred Debits and Other Assets	13,223,883	12,894,882
Total Assets	54,105,167	53,230,900
Current Liabilities:
Accounts Payable	1,821,911	2,113,905
Regulatory Liabilities	650,538	890,786
Other Current Liabilities	1,078,421	989,053
Total Current Liabilities	6,405,041	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,239,443	5,067,902
Regulatory Liabilities	3,974,374	3,930,305
Derivative Liabilities	124,281	143,929
Other Long-Term Liabilities	884,717	888,081
Total Deferred Credits and Other Liabilities	10,843,710	10,668,403
Long-Term Debt	20,562,588	19,723,994
Noncontrolling Interest – Preferred Stock of Subsidiaries	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,412,085	8,401,731
Retained Earnings	5,782,958	5,527,153
Accumulated Other Comprehensive Income	(36,191)	(39,421)
Common Shareholders' Equity	15,749,371	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	54,105,167	53,230,900
The Connecticut Light and Power Company
Current Assets:
Cash	9,340	11,312
Receivables, Net (net of allowance for uncollectible accounts)	633,048	612,052
Accounts Receivable from Affiliated Companies	69,095	46,439
Unbilled Revenues	54,048	59,363
Materials, Supplies, Natural Gas and REC Inventory	103,987	88,157
Taxes Receivable	26,723	65,785
Regulatory Assets	356,468	314,089
Prepayments and Other Current Assets	93,078	62,524
Total Current Assets	1,345,787	1,259,721
Property, Plant and Equipment, Net	11,630,278	11,467,024
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	1,639,960	1,593,693
Prepaid Pension	155,856	147,914
Other Long-Term Assets	302,817	290,444
Total Deferred Debits and Other Assets	2,098,633	2,032,051
Total Assets	15,074,698	14,758,796
Current Liabilities:
Notes Payable to Eversource Parent	318,000	0
Accounts Payable	622,024	710,500
Accounts Payable to Affiliated Companies	141,792	136,277
Regulatory Liabilities	124,640	336,048
Derivative Liabilities	85,105	81,588
Other Current Liabilities	205,692	163,875
Total Current Liabilities	1,497,253	1,428,288
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,740,504	1,640,034
Regulatory Liabilities	1,277,281	1,263,396
Derivative Liabilities	124,281	143,929
Other Long-Term Liabilities	160,104	166,081
Total Deferred Credits and Other Liabilities	3,302,170	3,213,440
Long-Term Debt	4,310,233	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	3,260,765	3,260,765
Retained Earnings	2,527,520	2,463,094
Accumulated Other Comprehensive Income	205	169
Common Shareholders' Equity	5,848,842	5,784,380
Commitments and Contingencies
Total Liabilities and Capitalization	$ 15,074,698	$ 14,758,796

THE CONNECTICUT LIGHT AND POW_2

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 535,114	$ 486,297
The Connecticut Light and Power Company
Allowance for uncollectible accounts	$ 253,376	$ 225,320

THE CONNECTICUT LIGHT AND POW_3

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Revenues	$ 3,795,643	$ 3,471,310
Operating Expenses:
Purchased Power and Transmission	1,903,246	1,389,696
Operations and Maintenance	454,562	472,433
Depreciation	312,955	289,330
Energy Efficiency Programs	222,952	199,484
Taxes Other Than Income Taxes	228,414	220,364
Total Operating Expenses	3,046,070	2,808,255
Operating Income/(Loss)	749,573	663,055
Interest Expense	194,543	153,245
Other Income, Net	88,981	71,561
Income Before Income Tax Expense	644,011	581,371
Income Tax Expense	150,972	136,045
Net Income	493,039	445,326
The Connecticut Light and Power Company
Operating Revenues	1,338,905	1,285,831
Operating Expenses:
Purchased Power and Transmission	850,564	523,463
Operations and Maintenance	160,316	157,061
Depreciation	92,237	87,265
Amortization of Regulatory (Liabilities)/Assets, Net	(122,315)	169,749
Energy Efficiency Programs	32,646	35,397
Taxes Other Than Income Taxes	101,584	90,373
Total Operating Expenses	1,115,032	1,063,308
Operating Income/(Loss)	223,873	222,523
Interest Expense	45,201	40,586
Other Income, Net	14,937	19,564
Income Before Income Tax Expense	193,609	201,501
Income Tax Expense	45,193	48,524
Net Income	$ 148,416	$ 152,977

THE CONNECTICUT LIGHT AND POW_4

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Income	$ 493,039	$ 445,326
Other Comprehensive Income/(Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	5	5
Changes in Unrealized Gains/(Losses) on Marketable Securities	1,254	(817)
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Comprehensive Income Attributable to Common Shareholders	494,389	444,150
The Connecticut Light and Power Company
Net Income	148,416	152,977
Other Comprehensive Income/(Loss), Net of Tax:
Qualified Cash Flow Hedging Instruments	(7)	(7)
Changes in Unrealized Gains/(Losses) on Marketable Securities	43	(28)
Other Comprehensive Income (Loss), Net of Tax	36	(35)
Comprehensive Income Attributable to Common Shareholders	$ 148,452	$ 152,942

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, Net of Tax	704				704	(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, 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, Net of Tax	$ 3,230				3,230	36				36
Balance (in shares) at Mar. 31, 2023	348,808,082	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

THE CONNECTICUT LIGHT AND POW_6

THE CONNECTICUT LIGHT AND POWER COMPANY CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 493,039	$ 445,326
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	312,955	289,330
Deferred Income Taxes	149,197	67,557
Uncollectible Expense	22,821	17,135
Pension, SERP, and PBOP Income, Net	(24,563)	(40,642)
Regulatory Under Recoveries, Net	(158,964)	(107,767)
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
Cost of Removal Expenditures	(70,514)	(61,660)
Other	(54,486)	(21,409)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(225,609)	(291,723)
Taxes Receivable/Accrued, Net	284	56,519
Accounts Payable	(258,476)	(68,909)
Other Current Assets and Liabilities, Net	(39,368)	(64,253)
Net Cash Flows (Used In)/Provided by Operating Activities	69,157	371,940
Investing Activities:
Investments in Property, Plant and Equipment	(977,144)	(764,594)
Other Investing Activities	5,640	5,976
Net Cash Flows Used in Investing Activities	(1,051,550)	(858,247)
Financing Activities:
Cash Dividends on Common Shares	(229,405)	(213,890)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
Issuance of Long-Term Debt	1,550,000	1,300,000
Retirement of Long-Term Debt	(400,000)	(770,000)
(Decrease)/Increase in Notes Payable to Eversource Parent	(246,700)	163,350
Other Financing Activities	(27,002)	(26,087)
Net Cash Flows (Used in)/Provided by Financing Activities	623,408	429,888
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(358,985)	(56,419)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	162,767	164,589
The Connecticut Light and Power Company
Operating Activities:
Net Income	148,416	152,977
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	92,237	87,265
Deferred Income Taxes	94,267	19,627
Uncollectible Expense	3,876	3,776
Pension, SERP, and PBOP Income, Net	(4,461)	(7,330)
Regulatory Under Recoveries, Net	(110,114)	(162,474)
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
Amortization of Regulatory (Liabilities)/Assets, Net	(122,315)	169,749
Cost of Removal Expenditures	(13,011)	(16,684)
Other	(13,964)	(9,357)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(76,482)	(125,429)
Taxes Receivable/Accrued, Net	52,261	67,708
Accounts Payable	(110,926)	38,010
Other Current Assets and Liabilities, Net	(13,412)	(24,143)
Net Cash Flows (Used In)/Provided by Operating Activities	(73,628)	135,283
Investing Activities:
Investments in Property, Plant and Equipment	(255,905)	(205,343)
Other Investing Activities	126	346
Net Cash Flows Used in Investing Activities	(255,779)	(204,997)
Financing Activities:
Cash Dividends on Common Shares	(82,600)	(73,100)
Cash Dividends on Preferred Stock	(1,390)	(1,390)
Capital Contributions from Eversource Parent	0	100,000
Issuance of Long-Term Debt	500,000	0
Retirement of Long-Term Debt	(400,000)	0
(Decrease)/Increase in Notes Payable to Eversource Parent	318,000	0
Other Financing Activities	(6,521)	0
Net Cash Flows (Used in)/Provided by Financing Activities	327,489	25,510
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(1,918)	(44,204)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	20,327	74,788
Cash and Restricted Cash - End of Period	$ 18,409	$ 30,584

NSTAR ELECTRIC COMPANY AND SUBS

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 35,975	$ 47,597
Cash Equivalents	0	327,006
Receivables, Net (net of allowance for uncollectible accounts)	1,660,076	1,517,138
Unbilled Revenues	216,715	238,968
Materials, Supplies, Natural Gas and REC Inventory	423,343	374,395
Regulatory Assets	1,332,028	1,335,491
Prepayments and Other Current Assets	468,292	382,603
Total Current Assets	4,136,429	4,223,198
Property, Plant and Equipment, Net	36,744,855	36,112,820
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,407,875	4,242,794
Prepaid Pension and PBOP	1,097,814	1,045,524
Other Long-Term Assets	560,632	541,344
Total Deferred Debits and Other Assets	13,223,883	12,894,882
Total Assets	54,105,167	53,230,900
Current Liabilities:
Notes Payable	1,195,500	1,442,200
Long-Term Debt – Current Portion	1,615,461	1,320,129
Accounts Payable	1,821,911	2,113,905
Regulatory Liabilities	650,538	890,786
Other Current Liabilities	1,078,421	989,053
Total Current Liabilities	6,405,041	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,239,443	5,067,902
Regulatory Liabilities	3,974,374	3,930,305
Other Long-Term Liabilities	884,717	888,081
Total Deferred Credits and Other Liabilities	10,843,710	10,668,403
Long-Term Debt	20,562,588	19,723,994
Preferred Stock Not Subject to Mandatory Redemption	155,570	155,570
Common Shareholders' Equity:
Capital Surplus, Paid In	8,412,085	8,401,731
Retained Earnings	5,782,958	5,527,153
Accumulated Other Comprehensive Income	(36,191)	(39,421)
Common Shareholders' Equity	15,749,371	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	54,105,167	53,230,900
NSTAR Electric Company
Current Assets:
Cash	618	738
Cash Equivalents	0	327,006
Receivables, Net (net of allowance for uncollectible accounts)	500,985	453,371
Accounts Receivable from Affiliated Companies	59,062	35,196
Unbilled Revenues	43,091	39,680
Materials, Supplies, Natural Gas and REC Inventory	190,301	138,352
Regulatory Assets	559,758	492,759
Prepayments and Other Current Assets	62,149	71,276
Total Current Assets	1,415,964	1,558,378
Property, Plant and Equipment, Net	11,819,012	11,626,968
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	1,263,534	1,221,619
Prepaid Pension and PBOP	596,214	576,809
Other Long-Term Assets	118,185	111,846
Total Deferred Debits and Other Assets	1,977,933	1,910,274
Total Assets	15,212,909	15,095,620
Current Liabilities:
Notes Payable	147,500	0
Long-Term Debt – Current Portion	80,000	80,000
Accounts Payable	514,504	559,676
Accounts Payable to Affiliated Companies	164,953	108,907
Obligations to Third Party Suppliers	156,717	142,628
Renewable Portfolio Standards Compliance Obligations	157,580	120,239
Regulatory Liabilities	375,047	373,221
Other Current Liabilities	80,908	83,925
Total Current Liabilities	1,677,209	1,468,596
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	1,758,232	1,700,875
Regulatory Liabilities	1,557,614	1,548,081
Other Long-Term Liabilities	292,953	289,313
Total Deferred Credits and Other Liabilities	3,608,799	3,538,269
Long-Term Debt	4,346,024	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	2,810,242	2,778,942
Retained Earnings	2,727,367	2,921,444
Accumulated Other Comprehensive Income	268	284
Common Shareholders' Equity	5,537,877	5,700,670
Commitments and Contingencies
Total Liabilities and Capitalization	$ 15,212,909	$ 15,095,620

NSTAR ELECTRIC COMPANY AND SU_2

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 535,114	$ 486,297
NSTAR Electric
Allowance for uncollectible accounts	$ 94,556	$ 94,958

NSTAR ELECTRIC COMPANY AND SU_3

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Revenues	$ 3,795,643	$ 3,471,310
Operating Expenses:
Purchased Power and Transmission	1,903,246	1,389,696
Operations and Maintenance	454,562	472,433
Depreciation	312,955	289,330
Energy Efficiency Programs	222,952	199,484
Taxes Other Than Income Taxes	228,414	220,364
Total Operating Expenses	3,046,070	2,808,255
Operating Income/(Loss)	749,573	663,055
Interest Expense	194,543	153,245
Other Income, Net	88,981	71,561
Income Before Income Tax Expense	644,011	581,371
Income Tax Expense	150,972	136,045
Net Income	493,039	445,326
NSTAR Electric Company
Operating Revenues	956,283	863,176
Operating Expenses:
Purchased Power and Transmission	360,925	313,748
Operations and Maintenance	166,083	164,862
Depreciation	90,430	89,033
Amortization of Regulatory (Liabilities)/Assets, Net	22,785	29,345
Energy Efficiency Programs	86,217	80,232
Taxes Other Than Income Taxes	53,510	59,774
Total Operating Expenses	779,950	736,994
Operating Income/(Loss)	176,333	126,182
Interest Expense	44,865	38,222
Other Income, Net	39,873	29,231
Income Before Income Tax Expense	171,341	117,191
Income Tax Expense	37,528	24,452
Net Income	$ 133,813	$ 92,739

NSTAR ELECTRIC COMPANY AND SU_4

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Income	$ 493,039	$ 445,326
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of SERP Benefit Plan	1,971	1,516
Qualified Cash Flow Hedging Instruments	5	5
Changes in Unrealized Gains/(Losses) on Marketable Securities	1,254	(817)
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Comprehensive Income Attributable to Common Shareholders	494,389	444,150
NSTAR Electric Company
Net Income	133,813	92,739
Other Comprehensive Income, Net of Tax:
Changes in Funded Status of SERP Benefit Plan	(33)	(44)
Qualified Cash Flow Hedging Instruments	5	5
Changes in Unrealized Gains/(Losses) on Marketable Securities	12	(8)
Other Comprehensive Income (Loss), Net of Tax	(16)	(47)
Comprehensive Income Attributable to Common Shareholders	$ 133,797	$ 92,692

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)	704				704	(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, 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)	$ 3,230				3,230	(16)				(16)
Balance (in shares) at Mar. 31, 2023	348,808,082	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

NSTAR ELECTRIC COMPANY AND SU_6

NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 493,039	$ 445,326
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	312,955	289,330
Deferred Income Taxes	149,197	67,557
Uncollectible Expense	22,821	17,135
Pension, SERP and PBOP Income, Net	(24,563)	(40,642)
Pension Contributions	(1,100)	(26,100)
Regulatory Under Recoveries, Net	(158,964)	(107,767)
Cost of Removal Expenditures	(70,514)	(61,660)
Other	(54,486)	(21,409)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(225,609)	(291,723)
Taxes Receivable/Accrued, Net	284	56,519
Accounts Payable	(258,476)	(68,909)
Other Current Assets and Liabilities, Net	(39,368)	(64,253)
Net Cash Flows (Used In)/Provided by Operating Activities	69,157	371,940
Investing Activities:
Investments in Property, Plant and Equipment	(977,144)	(764,594)
Other Investing Activities	5,640	5,976
Net Cash Flows Used in Investing Activities	(1,051,550)	(858,247)
Financing Activities:
Cash Dividends on Common Shares	(229,405)	(213,890)
Cash Dividends on Preferred Stock	(1,880)	(1,880)
(Decrease)/Increase in Notes Payable to Eversource Parent	(246,700)	163,350
Other Financing Activities	(27,002)	(26,087)
Net Cash Flows (Used in)/Provided by Financing Activities	623,408	429,888
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(358,985)	(56,419)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	162,767	164,589
NSTAR Electric
Operating Activities:
Net Income	133,813	92,739
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	90,430	89,033
Deferred Income Taxes	44,403	26,857
Uncollectible Expense	4,697	4,662
Pension, SERP and PBOP Income, Net	(9,886)	(13,742)
Pension Contributions	0	(5,000)
Regulatory Under Recoveries, Net	(58,000)	(10,813)
Amortization of Regulatory (Liabilities)/Assets, Net	22,785	29,345
Cost of Removal Expenditures	(12,893)	(12,852)
Other	(9,921)	(5,531)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(90,684)	2,051
Taxes Receivable/Accrued, Net	11,977	45,299
Accounts Payable	20,249	(55,743)
Other Current Assets and Liabilities, Net	(6,185)	3,559
Net Cash Flows (Used In)/Provided by Operating Activities	140,785	189,864
Investing Activities:
Investments in Property, Plant and Equipment	(318,673)	(234,120)
Other Investing Activities	35	96
Net Cash Flows Used in Investing Activities	(318,638)	(234,024)
Financing Activities:
Cash Dividends on Common Shares	(327,400)	(71,900)
Cash Dividends on Preferred Stock	(490)	(490)
Capital Contributions from Eversource Parent	31,300	0
(Decrease)/Increase in Notes Payable to Eversource Parent	0	4,000
Increase in Notes Payable	147,500	112,500
Other Financing Activities	5	15
Net Cash Flows (Used in)/Provided by Financing Activities	(149,085)	44,125
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(326,938)	(35)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	345,293	18,179
Cash and Restricted Cash - End of Period	$ 18,355	$ 18,144

PUBLIC SERVICE COMPANY OF NEW H

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash	$ 35,975	$ 47,597
Receivables, Net (net of allowance for uncollectible accounts)	1,660,076	1,517,138
Unbilled Revenues	216,715	238,968
Materials, Supplies and REC Inventory	423,343	374,395
Regulatory Assets	1,332,028	1,335,491
Prepayments and Other Current Assets	468,292	382,603
Total Current Assets	4,136,429	4,223,198
Property, Plant and Equipment, Net	36,744,855	36,112,820
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	4,407,875	4,242,794
Prepaid Pension and PBOP	1,097,814	1,045,524
Other Long-Term Assets	560,632	541,344
Total Deferred Debits and Other Assets	13,223,883	12,894,882
Total Assets	54,105,167	53,230,900
Current Liabilities:
Long-Term Debt – Current Portion	1,615,461	1,320,129
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	1,821,911	2,113,905
Regulatory Liabilities	650,538	890,786
Other Current Liabilities	1,078,421	989,053
Total Current Liabilities	6,405,041	6,799,283
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	5,239,443	5,067,902
Regulatory Liabilities	3,974,374	3,930,305
Other Long-Term Liabilities	884,717	888,081
Total Deferred Credits and Other Liabilities	10,843,710	10,668,403
Long-Term Debt	20,562,588	19,723,994
Rate Reduction Bonds	388,887	410,492
Common Shareholders' Equity:
Capital Surplus, Paid In	8,412,085	8,401,731
Retained Earnings	5,782,958	5,527,153
Accumulated Other Comprehensive Loss	(36,191)	(39,421)
Common Shareholders' Equity	15,749,371	15,473,158
Commitments and Contingencies
Total Liabilities and Capitalization	54,105,167	53,230,900
PSNH
Current Assets:
Cash	88	136
Receivables, Net (net of allowance for uncollectible accounts)	167,960	173,337
Accounts Receivable from Affiliated Companies	25,270	8,193
Unbilled Revenues	67,266	72,713
Taxes Receivable	48,173	27,978
Materials, Supplies and REC Inventory	43,492	34,521
Regulatory Assets	140,912	102,240
Special Deposits	19,469	33,140
Prepayments and Other Current Assets	6,869	13,297
Total Current Assets	519,499	465,555
Property, Plant and Equipment, Net	4,147,985	4,060,224
Deferred Debits and Other Assets:
Total Long-Term Regulatory Assets	697,568	593,974
Prepaid Pension and PBOP	70,892	66,384
Other Long-Term Assets	15,183	16,517
Total Deferred Debits and Other Assets	783,643	676,875
Total Assets	5,451,127	5,202,654
Current Liabilities:
Notes Payable to Eversource Parent	121,100	173,300
Long-Term Debt – Current Portion	325,000	29,668
Rate Reduction Bonds – Current Portion	43,210	43,210
Accounts Payable	301,547	291,556
Accounts Payable to Affiliated Companies	51,985	36,231
Regulatory Liabilities	86,569	161,963
Other Current Liabilities	62,784	59,616
Total Current Liabilities	992,195	795,544
Deferred Credits and Other Liabilities:
Accumulated Deferred Income Taxes	625,374	562,802
Regulatory Liabilities	390,290	391,628
Other Long-Term Liabilities	37,418	37,087
Total Deferred Credits and Other Liabilities	1,053,082	991,517
Long-Term Debt	1,134,407	1,134,914
Rate Reduction Bonds	388,887	410,492
Common Shareholders' Equity:
Common Shares	0	0
Capital Surplus, Paid In	1,298,134	1,298,134
Retained Earnings	584,422	572,126
Accumulated Other Comprehensive Loss	0	(73)
Common Shareholders' Equity	1,882,556	1,870,187
Commitments and Contingencies
Total Liabilities and Capitalization	$ 5,451,127	$ 5,202,654

PUBLIC SERVICE COMPANY OF NEW_2

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Allowance for uncollectible accounts	$ 535,114	$ 486,297
PSNH
Allowance for uncollectible accounts	$ 33,505	$ 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
	Mar. 31, 2023	Mar. 31, 2022
Operating Revenues	$ 3,795,643	$ 3,471,310
Operating Expenses:
Purchased Power and Transmission	1,903,246	1,389,696
Operations and Maintenance	454,562	472,433
Depreciation	312,955	289,330
Energy Efficiency Programs	222,952	199,484
Taxes Other Than Income Taxes	228,414	220,364
Total Operating Expenses	3,046,070	2,808,255
Operating Income/(Loss)	749,573	663,055
Interest Expense	194,543	153,245
Other Income, Net	88,981	71,561
Income Before Income Tax Expense	644,011	581,371
Income Tax Expense	150,972	136,045
Net Income	493,039	445,326
PSNH
Operating Revenues	420,155	339,427
Operating Expenses:
Purchased Power and Transmission	226,685	125,844
Operations and Maintenance	67,796	59,573
Depreciation	34,088	31,253
Amortization of Regulatory (Liabilities)/Assets, Net	(5,317)	26,834
Energy Efficiency Programs	10,226	8,718
Taxes Other Than Income Taxes	22,105	22,785
Total Operating Expenses	355,583	275,007
Operating Income/(Loss)	64,572	64,420
Interest Expense	17,542	13,645
Other Income, Net	5,717	7,509
Income Before Income Tax Expense	52,747	58,284
Income Tax Expense	12,451	12,698
Net Income	$ 40,296	$ 45,586

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
	Mar. 31, 2023	Mar. 31, 2022
Net Income	$ 493,039	$ 445,326
Other Comprehensive Income/(Loss), Net of Tax:
Changes in Unrealized Gains/(Losses) on Marketable Securities	1,254	(817)
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Comprehensive Income Attributable to Common Shareholders	494,389	444,150
PSNH
Net Income	40,296	45,586
Other Comprehensive Income/(Loss), Net of Tax:
Changes in Unrealized Gains/(Losses) on Marketable Securities	73	(48)
Other Comprehensive Income (Loss), Net of Tax	73	(48)
Comprehensive Income Attributable to Common Shareholders	$ 40,369	$ 45,538

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)	704				704	(48)				(48)
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, 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)	$ 3,230				3,230	73				73
Balance (in shares) at Mar. 31, 2023	348,808,082	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

PUBLIC SERVICE COMPANY OF NEW_6

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net Income	$ 493,039	$ 445,326
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	312,955	289,330
Deferred Income Taxes	149,197	67,557
Uncollectible Expense	22,821	17,135
Pension, SERP and PBOP Income, Net	(24,563)	(40,642)
Regulatory Over/(Underrecoveries), Net	(158,964)	(107,767)
Cost of Removal Expenditures	(70,514)	(61,660)
Other	(54,486)	(21,409)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(225,609)	(291,723)
Taxes Receivable/Accrued, Net	284	56,519
Accounts Payable	(258,476)	(68,909)
Other Current Assets and Liabilities, Net	(39,368)	(64,253)
Net Cash Flows (Used In)/Provided by Operating Activities	69,157	371,940
Investing Activities:
Investments in Property, Plant and Equipment	(977,144)	(764,594)
Other Investing Activities	5,640	5,976
Net Cash Flows Used in Investing Activities	(1,051,550)	(858,247)
Financing Activities:
Cash Dividends on Common Shares	(229,405)	(213,890)
Issuance of Long-Term Debt	1,550,000	1,300,000
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
(Decrease)/Increase in Notes Payable to Eversource Parent	(246,700)	163,350
Other Financing Activities	(27,002)	(26,087)
Net Cash Flows (Used in)/Provided by Financing Activities	623,408	429,888
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(358,985)	(56,419)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	521,752	221,008
Cash and Restricted Cash - End of Period	162,767	164,589
PSNH
Operating Activities:
Net Income	40,296	45,586
Adjustments to Reconcile Net Income to Net Cash Flows (Used In)/Provided by Operating Activities:
Depreciation	34,088	31,253
Deferred Income Taxes	62,924	7,480
Uncollectible Expense	5,060	2,496
Pension, SERP and PBOP Income, Net	(2,552)	(3,997)
Regulatory Over/(Underrecoveries), Net	(175,865)	(32,186)
Amortization of Regulatory (Liabilities)/Assets, Net	(5,317)	26,834
Cost of Removal Expenditures	(4,508)	(7,131)
Other	1,711	(4,631)
Changes in Current Assets and Liabilities:
Receivables and Unbilled Revenues, Net	(21,230)	(25,972)
Taxes Receivable/Accrued, Net	(20,195)	8,067
Accounts Payable	10,265	9,389
Other Current Assets and Liabilities, Net	2,462	895
Net Cash Flows (Used In)/Provided by Operating Activities	(72,861)	58,083
Investing Activities:
Investments in Property, Plant and Equipment	(133,890)	(107,916)
Other Investing Activities	216	593
Net Cash Flows Used in Investing Activities	(133,674)	(107,323)
Financing Activities:
Cash Dividends on Common Shares	(28,000)	(26,000)
Issuance of Long-Term Debt	300,000	0
Repayment of Rate Reduction Bonds	(21,605)	(21,605)
(Decrease)/Increase in Notes Payable to Eversource Parent	(52,200)	85,800
Other Financing Activities	(5,460)	(23)
Net Cash Flows (Used in)/Provided by Financing Activities	192,735	38,172
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(13,800)	(11,068)
Cash, Cash Equivalents and Restricted Cash - Beginning of Period	36,812	35,126
Cash and Restricted Cash - End of Period	$ 23,012	$ 24,058

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 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 March 31, 2023 and December 31, 2022, and the results of operations, comprehensive income, common shareholders' equity and cash flows for the three months ended March 31, 2023 and 2022. The results of operations, comprehensive income and cash flows for the three months ended March 31, 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 March 31, 2023 adequately reflected the collection risk and net realizable value for its receivables. As of both March 31, 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 March 31 st 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 Three 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 — 22.8 22.8 — 3.9 3.9 — 4.7 4.7 5.1 Uncollectible Costs Deferred (1) 43.7 14.3 58.0 34.3 2.7 37.0 (1.3) 5.4 4.1 1.2 Write-Offs (9.7) (26.3) (36.0) (7.3) (7.0) (14.3) (0.4) (10.3) (10.7) (2.2) Recoveries Collected 0.3 3.7 4.0 0.3 1.2 1.5 — 1.5 1.5 0.2 Ending Balance $ 318.7 $ 216.4 $ 535.1 $ 216.2 $ 37.2 $ 253.4 $ 42.0 $ 52.6 $ 94.6 $ 33.5 Three 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 — 17.1 17.1 — 3.8 3.8 — 4.7 4.7 2.5 Uncollectible Costs Deferred (1) 0.9 14.8 15.7 (4.0) (2.1) (6.1) (3.3) 5.4 2.1 1.0 Write-Offs (2.3) (22.0) (24.3) (1.1) (0.5) (1.6) (0.3) (10.6) (10.9) (1.8) Recoveries Collected 0.8 5.5 6.3 0.6 2.5 3.1 — 1.9 1.9 0.2 Ending Balance $ 225.5 $ 206.7 $ 432.2 $ 140.1 $ 40.4 $ 180.5 $ 39.7 $ 55.1 $ 94.8 $ 26.2 (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. 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 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 March 31, 2023 March 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 34.8 $ 9.5 $ 14.7 $ 4.2 $ 54.3 $ 15.9 $ 21.0 $ 6.6 AFUDC Equity 15.5 4.1 9.5 0.7 9.9 2.8 4.9 0.4 Equity in Earnings of Unconsolidated Affiliates 3.8 — 0.1 — 0.4 — — — Investment (Loss)/Income (1.7) (0.6) (0.5) (0.1) (0.2) (0.4) (0.3) 0.2 Interest Income 23.1 1.9 16.0 0.9 6.7 1.3 3.5 0.3 Other 13.5 — 0.1 — 0.5 — 0.1 — Total Other Income, Net $ 89.0 $ 14.9 $ 39.9 $ 5.7 $ 71.6 $ 19.6 $ 29.2 $ 7.5 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 March 31, 2023 As of December 31, 2022 Offshore Wind Business - North East Offshore 50 % $ 2,159.2 $ 1,947.1 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 117.5 118.8 Renewable Energy Investment Fund 90 % — 84.1 Other various 26.2 26.1 Total Investments in Unconsolidated Affiliates $ 2,302.9 $ 2,176.1 Offshore Wind Business: Eversource’s offshore wind business includes a 50 percent ownership interest in North East Offshore, which holds PPAs and contracts for the Revolution Wind, South Fork Wind and Sunrise Wind projects, as well as an undeveloped offshore lease area. The offshore wind investment includes capital expenditures for the three offshore wind projects, as well as capitalized costs related to future development, acquisition costs of offshore lease areas, and capitalized interest. On May 4, 2022, Eversource announced that it had initiated a strategic review of its offshore wind investment portfolio. As part of that review, Eversource is exploring strategic alternatives that could result in a potential sale of all, or part, of its 50 percent interest in its offshore wind partnership with Ørsted. Eversource continues to work with interested parties through this ongoing process and expects to complete this review in the second quarter of 2023. Eversource’s strategic review of its offshore wind investment does not impact the presentation of the March 31, 2023 financial statements. 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. Eversource believes that the fair market value of its offshore wind investment is greater than the carrying value based upon management’s expectation for future cash flows arising from the sale of all, or part, of its investment. There are uncertainties in a sale process, and there could be changes in market conditions that would impact Eversource’s ability to sell this investment or the value it would receive for these assets. In the event that the strategic review does not result in the sale of the offshore wind business or that a sale of the offshore wind business is significantly delayed or at a lower than expected value from these changes in market conditions driven by unfavorable developments, such as scheduling or permitting delays, increases in actual costs and cost estimates, changes to tax laws impacting the project’s ability to monetize tax attributes, higher interest rates, and increases in the discount rate, it could result in Eversource having to evaluate whether or not its investment is impaired. Any resulting impairment charge could have a material adverse effect on Eversource’s financial position and results of operations. 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 were $123.4 million and are included in Investments in Unconsolidated Affiliates within investing activities on the statement of cash flows. Additional amounts in escrow as of March 31, 2023 resulting from the liquidation were received in the second quarter of 2023. A portion of the proceeds were 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 and 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 (Millions of Dollars) March 31, 2023 March 31, 2022 Eversource $ 55.0 $ 48.6 CL&P 43.1 37.8 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 March 31, 2023 As of March 31, 2022 Eversource $ 400.8 $ 385.6 CL&P 101.9 102.1 NSTAR Electric 117.4 85.8 PSNH 54.6 49.5 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 March 31, 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 $ 36.0 $ 9.3 $ 0.6 $ 0.1 $ 374.6 $ 11.3 $ 327.7 $ 0.1 Restricted cash included in: Special Deposits 89.0 8.9 17.8 19.5 102.2 8.8 17.5 33.1 Marketable Securities 17.9 0.2 — 0.2 25.4 0.2 0.1 0.4 Other Long-Term Assets 19.9 — — 3.2 19.6 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 162.8 $ 18.4 $ 18.4 $ 23.0 $ 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. Restricted cash included in Marketable Securities represents money market funds held in trusts to fund certain non-qualified executive benefits and restricted trusts to fund CYAPC and YAEC's spent nuclear fuel storage obligations.

REGULATORY ACCOUNTING

REGULATORY ACCOUNTING	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Storm Costs, Net $ 1,658.7 $ 889.2 $ 564.9 $ 204.6 $ 1,379.1 $ 799.3 $ 484.4 $ 95.4 Regulatory Tracking Mechanisms 1,028.7 228.2 432.4 122.8 1,075.3 216.8 391.5 73.7 Benefit Costs 910.3 155.6 294.4 56.1 921.7 156.7 299.5 56.6 Income Taxes, Net 856.1 492.9 118.1 13.1 853.3 491.1 115.6 16.0 Securitized Stranded Costs 424.9 — — 424.9 435.7 — — 435.7 Goodwill-related 276.7 — 237.6 — 281.0 — 241.2 — Derivative Liabilities 168.8 168.8 — — 181.8 181.8 — — Asset Retirement Obligations 129.2 36.5 68.0 4.5 127.9 35.9 68.2 4.4 Other Regulatory Assets 286.5 25.3 107.9 12.5 322.5 26.2 114.0 14.4 Total Regulatory Assets 5,739.9 1,996.5 1,823.3 838.5 5,578.3 1,907.8 1,714.4 696.2 Less: Current Portion 1,332.0 356.5 559.8 140.9 1,335.5 314.1 492.8 102.2 Total Long-Term Regulatory Assets $ 4,407.9 $ 1,640.0 $ 1,263.5 $ 697.6 $ 4,242.8 $ 1,593.7 $ 1,221.6 $ 594.0 Regulatory Costs in Long-Term Assets: Eversource's regulated companies had $223.6 million (including $146.5 million for CL&P, $19.7 million for NSTAR Electric and $1.1 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 March 31, 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 both March 31, 2023 and December 31, 2022, these regulatory costs 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 March 31, 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 $ 2,601.8 $ 980.0 $ 933.9 $ 346.1 $ 2,619.3 $ 983.6 $ 944.3 $ 348.6 Cost of Removal 705.4 144.2 412.9 20.2 670.6 130.8 405.3 14.7 Regulatory Tracking Mechanisms 653.6 145.0 341.6 73.2 890.8 361.0 336.1 155.0 Deferred Portion of Non-Service Income 291.4 38.3 148.5 30.8 270.9 34.5 139.7 28.8 AFUDC - Transmission 103.8 49.8 54.0 — 98.2 48.2 50.0 — Benefit Costs 49.2 0.6 27.1 — 55.4 0.7 31.4 — Other Regulatory Liabilities 219.7 44.0 14.6 6.6 215.9 40.6 14.5 6.5 Total Regulatory Liabilities 4,624.9 1,401.9 1,932.6 476.9 4,821.1 1,599.4 1,921.3 553.6 Less: Current Portion 650.5 124.6 375.0 86.6 890.8 336.0 373.2 162.0 Total Long-Term Regulatory Liabilities $ 3,974.4 $ 1,277.3 $ 1,557.6 $ 390.3 $ 3,930.3 $ 1,263.4 $ 1,548.1 $ 391.6

PROPERTY, PLANT AND EQUIPMENT A

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 (Millions of Dollars) Distribution - Electric $ 18,618.6 $ 18,326.2 Distribution - Natural Gas 7,562.8 7,443.8 Transmission - Electric 13,884.0 13,709.3 Distribution - Water 2,122.5 2,112.6 Solar 200.8 200.8 Utility 42,388.7 41,792.7 Other (1) 1,791.7 1,738.1 Property, Plant and Equipment, Gross 44,180.4 43,530.8 Less: Accumulated Depreciation Utility (9,317.7) (9,167.4) Other (744.7) (706.1) Total Accumulated Depreciation (10,062.4) (9,873.5) Property, Plant and Equipment, Net 34,118.0 33,657.3 Construction Work in Progress 2,626.9 2,455.5 Total Property, Plant and Equipment, Net $ 36,744.9 $ 36,112.8 As of March 31, 2023 As of December 31, 2022 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,510.8 $ 8,516.7 $ 2,631.4 $ 7,370.1 $ 8,410.0 $ 2,586.4 Transmission - Electric 6,235.2 5,382.8 2,267.6 6,165.1 5,333.8 2,212.0 Solar — 200.8 — — 200.8 — Property, Plant and Equipment, Gross 13,746.0 14,100.3 4,899.0 13,535.2 13,944.6 4,798.4 Less: Accumulated Depreciation (2,610.4) (3,429.3) (940.0) (2,567.1) (3,381.2) (912.3) Property, Plant and Equipment, Net 11,135.6 10,671.0 3,959.0 10,968.1 10,563.4 3,886.1 Construction Work in Progress 494.7 1,148.0 189.0 498.9 1,063.6 174.1 Total Property, Plant and Equipment, Net $ 11,630.3 $ 11,819.0 $ 4,148.0 $ 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	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 17.0 $ (0.5) $ 16.5 $ 16.3 $ (0.5) $ 15.8 Long-Term Derivative Assets Level 3 24.9 (0.8) 24.1 28.8 (0.9) 27.9 Current Derivative Liabilities Level 3 (85.1) — (85.1) (81.6) — (81.6) Long-Term Derivative Liabilities Level 3 (124.3) — (124.3) (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 March 31, 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. The following is a summary of the significant unobservable inputs utilized in the valuations of the derivative contracts classified as Level 3: As of March 31, 2023 As of December 31, 2022 CL&P Range Average Period Covered Range Average Period Covered Forward Reserve Prices $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024 $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024 Exit price premiums of 2.3 percent through 6.6 percent, or a weighted average of 5.5 percent, are also 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. 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 March 31, (Millions of Dollars) 2023 2022 Derivatives, Net: Fair Value as of Beginning of Period $ (181.8) $ (249.2) Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets (1.9) 6.2 Settlements 14.9 13.6 Fair Value as of End of Period $ (168.8) $ (229.4)

MARKETABLE SECURITIES

MARKETABLE SECURITIES	3 Months Ended
	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
MARKETABLE SECURITIES	MARKETABLE SECURITIES Eversource holds marketable securities that are primarily used to fund certain non-qualified executive benefits. The trusts that hold these marketable securities are not subject to regulatory oversight by state or federal agencies. Eversource’s marketable securities also 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. 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 March 31, 2023 and December 31, 2022 was $19.6 million and $20.0 million, respectively. For the three months ended March 31, 2023 and 2022, there were unrealized gains of $0.8 million and unrealized losses of $4.4 million, respectively, recorded in Other Income, Net related to these equity securities. Eversource's equity securities also include CYAPC's and YAEC's marketable securities held in spent nuclear fuel trusts, which had fair values of $170.9 million and $170.1 million as of March 31, 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 March 31, 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 $ 196.5 $ 0.2 $ (14.8) $ 181.9 $ 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 were $1.2 million of unrealized losses recorded on securities intended to be sold for the three months ended March 31, 2023 that were included in Other Income, Net. There have been no credit losses for the three months ended March 31, 2023 and 2022, and no allowance for credit losses as of March 31, 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 $161.2 million and $163.2 million as of March 31, 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 March 31, 2023 and December 31, 2022 primarily relate to the debt securities included in CYAPC's and YAEC's spent nuclear fuel trusts. As of March 31, 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) $ 39.8 $ 38.9 One to five years 42.5 41.1 Six to ten years 35.6 32.8 Greater than ten years 78.6 69.1 Total Debt Securities $ 196.5 $ 181.9 (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. Amounts also include securities in Eversource’s non-qualified executive benefit trust, which are intended to be sold in 2023. 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 March 31, 2023 As of December 31, 2022 Level 1: Mutual Funds and Equities $ 190.5 $ 190.1 Money Market Funds 17.9 25.4 Total Level 1 $ 208.4 $ 215.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 91.5 $ 82.3 Corporate Debt Securities 44.2 46.1 Asset-Backed Debt Securities 8.5 8.6 Municipal Bonds 9.2 12.7 Other Fixed Income Securities 10.6 10.4 Total Level 2 $ 164.0 $ 160.1 Total Marketable Securities $ 372.4 $ 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	3 Months Ended
	Mar. 31, 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 15, 2027. This revolving credit facility serves to backstop Eversource parent's $2.00 billion commercial paper program. NSTAR Electric has a $650 million commercial paper program allowing NSTAR Electric to issue commercial paper as a form of short-term debt. NSTAR Electric is also a party to a five-year $650 million revolving credit facility, which terminates on October 15, 2027, 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 March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 1,048.0 $ 1,442.2 $ 952.0 $ 557.8 5.22 % 4.63 % NSTAR Electric Commercial Paper Program 147.5 — 502.5 650.0 4.77 % — % There were no borrowings outstanding on the revolving credit facilities as of March 31, 2023 or December 31, 2022. CL&P and PSNH have uncommitted line of credit agreements totaling $450 million and $300 million, respectively, which will expire on May 12, 2023. There are no borrowings outstanding on either the CL&P or PSNH uncommitted line of credit agreements as of March 31, 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 March 31, 2023, there were intercompany loans from Eversource parent to CL&P of $318.0 million and to PSNH of $121.1 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. 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 PSNH Series W First Mortgage Bonds 5.15 % 300.0 January 2023 January 2053 Repaid short-term debt, paid capital expenditures and working capital 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

RATE REDUCTION BONDS AND VARIAB

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 Restricted Cash - Current Portion (included in Current Assets) $ 18.7 $ 32.4 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 424.9 435.7 Other Regulatory Liabilities (included in Regulatory Liabilities) 8.8 6.0 Accrued Interest (included in Other Current Liabilities) 2.7 6.9 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 388.9 410.5 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended March 31, 2023 March 31, 2022 Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) $ 10.8 $ 10.8 Interest Expense on RRB Principal (included in Interest Expense) 4.1 4.4

PENSION BENEFITS AND POSTRETIRE

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION	3 Months Ended
	Mar. 31, 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 March 31, 2023 For the Three Months Ended March 31, 2023 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 11.0 $ 3.0 $ 2.1 $ 1.1 $ 1.8 $ 0.3 $ 0.3 $ 0.2 Interest Cost 63.7 12.6 13.5 6.8 8.5 1.6 2.3 0.9 Expected Return on Plan Assets (115.9) (23.4) (28.4) (12.3) (19.1) (2.4) (9.2) (1.4) Actuarial Loss 12.5 0.8 4.9 0.4 — — — — Prior Service Cost/(Credit) 0.3 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (28.4) $ (7.0) $ (7.8) $ (4.0) $ (14.2) $ (0.2) $ (10.8) $ (0.2) Intercompany Income Allocations N/A $ (2.0) $ (1.7) $ (0.5) N/A $ (0.5) $ (0.6) $ (0.2) Pension and SERP PBOP For the Three Months Ended March 31, 2022 For the Three Months Ended March 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 17.7 $ 4.5 $ 3.6 $ 1.8 $ 2.8 $ 0.5 $ 0.5 $ 0.2 Interest Cost 38.6 7.8 8.1 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (131.7) (26.6) (32.0) (14.1) (22.4) (2.8) (10.6) (1.6) Actuarial Loss 30.7 4.2 8.5 2.2 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.2 (4.3) 0.1 Total Net Periodic Benefit Plan Income $ (44.3) $ (10.1) $ (11.7) $ (5.9) $ (20.0) $ (1.2) $ (13.1) $ (0.8) Intercompany Income Allocations N/A $ (3.8) $ (2.9) $ (0.8) N/A $ (0.9) $ (0.9) $ (0.3)

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 Number of Sites Reserve Number of Sites Reserve Eversource 59 $ 121.2 59 $ 122.6 CL&P 13 13.6 13 13.9 NSTAR Electric 10 3.4 10 3.4 PSNH 8 6.1 8 6.1 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 $111.7 million and $112.6 million as of March 31, 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 $5.4 million and $4.2 million as of March 31, 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 March 31, 2023 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore LLC Construction-related purchase agreements with third-party contractors (1) $ 726.2 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 668.6 2025 - 2028 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 409.7 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 126.2 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of North East Offshore LLC (5) 68.9 (5) South Fork Wind, LLC Power Purchase Agreement Security (6) 7.1 (6) Sunrise Wind LLC OREC capacity production (7) 11.0 (7) Bay State Wind LLC Real estate purchase 2.5 2023 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (8) 4.3 — Various Surety bonds (9) 37.2 2023 - 2024 Eversource Service Lease payments for real estate 0.4 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party 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 5, 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 $838.4 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from 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 $547.1 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 $207.7 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from June 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the 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. (6) 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. (7) 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. (8) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. 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. (9) 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. Second Quarter 2023 Guarantees : In the second quarter of 2023, Eversource parent issued an additional guaranty on behalf of Sunrise Wind LLC totaling $86.1 million, whereby Eversource parent will guarantee Sunrise Wind LLC’s performance of certain construction obligations. 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 the fourth quarter of 2023. 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 March 31, 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 March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, 2023: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 137.1 $ 116.2 $ 100.8 $ 43.0 $ 36.3 $ — $ — Long-Term Debt 22,178.0 20,650.5 4,310.2 4,096.9 4,426.0 4,217.4 1,459.4 1,331.7 Rate Reduction Bonds 432.1 417.3 — — — — 432.1 417.3 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)	3 Months Ended
	Mar. 31, 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 Three Months Ended March 31, 2023 For the Three Months Ended March 31, 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 — — — — — (0.8) — (0.8) Amounts Reclassified from AOCI — 1.2 2.0 3.2 — — 1.5 1.5 Net OCI — 1.2 2.0 3.2 — (0.8) 1.5 0.7 Balance as of End of Period $ (0.4) $ — $ (35.8) $ (36.2) $ (0.4) $ (0.4) $ (40.8) $ (41.6) Defined benefit plan OCI amounts reclassified from AOCI relate to the unamortized actuarial gains and losses and prior service costs on the defined benefit plans that are amortized from AOCI into Other Income, Net over the average future employee service period.

COMMON SHARES

COMMON SHARES	3 Months Ended
	Mar. 31, 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 March 31, 2023 and December 31, 2022 Issued as of Par Value March 31, 2023 December 31, 2022 Eversource $ 5 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301 Treasury Shares: As of March 31, 2023 and December 31, 2022, there were 11,175,991 and 11,540,218 Eversource common shares held as treasury shares, respectively. As of March 31, 2023 and December 31, 2022, there we re 348,808,082 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	3 Months Ended
	Mar. 31, 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 March 31, 2023 and December 31, 2022 Issued as of Par Value March 31, 2023 December 31, 2022 Eversource $ 5 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301 Treasury Shares: As of March 31, 2023 and December 31, 2022, there were 11,175,991 and 11,540,218 Eversource common shares held as treasury shares, respectively. As of March 31, 2023 and December 31, 2022, there we re 348,808,082 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	3 Months Ended
	Mar. 31, 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 months ended March 31, 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 March 31, 2023 March 31, 2022 Net Income Attributable to Common Shareholders $ 491.2 $ 443.4 Weighted Average Common Shares Outstanding: Basic 349,217,147 345,156,346 Dilutive Effect 394,866 504,787 Diluted 349,612,013 345,661,133 Basic and Diluted EPS $ 1.41 $ 1.28

REVENUES

REVENUES	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
REVENUES	REVENUES The following tables present operating revenues disaggregated by revenue source: For the Three Months Ended March 31, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,464.0 $ 576.6 $ — $ 28.9 $ — $ — $ 2,069.5 Commercial 788.4 320.0 — 15.5 — (1.0) 1,122.9 Industrial 89.1 69.6 — 1.1 — (5.1) 154.7 Total Retail Tariff Sales Revenues 2,341.5 966.2 — 45.5 — (6.1) 3,347.1 Wholesale Transmission Revenues — — 435.0 — — (325.3) 109.7 Wholesale Market Sales Revenues 217.3 49.1 — 0.8 — — 267.2 Other Revenues from Contracts with Customers 18.3 1.5 4.7 2.1 413.8 (412.6) 27.8 Total Revenues from Contracts with Customers 2,577.1 1,016.8 439.7 48.4 413.8 (744.0) 3,751.8 Alternative Revenue Programs 6.0 27.4 18.7 1.7 — (16.9) 36.9 Other Revenues 5.5 1.0 0.2 0.2 — — 6.9 Total Operating Revenues $ 2,588.6 $ 1,045.2 $ 458.6 $ 50.3 $ 413.8 $ (760.9) $ 3,795.6 For the Three Months Ended March 31, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,186.2 $ 556.8 $ — $ 28.2 $ — $ — $ 1,771.2 Commercial 661.3 257.6 — 14.6 — (1.1) 932.4 Industrial 89.6 68.1 — 1.1 — (4.5) 154.3 Total Retail Tariff Sales Revenues 1,937.1 882.5 — 43.9 — (5.6) 2,857.9 Wholesale Transmission Revenues — — 446.2 — 24.4 (364.7) 105.9 Wholesale Market Sales Revenues 365.5 33.5 — 0.8 — — 399.8 Other Revenues from Contracts with Customers 17.7 1.0 3.8 1.9 359.1 (353.1) 30.4 Amortization of/(Reserve for) Revenues Subject to Refund (1) 58.4 — — (0.4) — — 58.0 Total Revenues from Contracts with Customers 2,378.7 917.0 450.0 46.2 383.5 (723.4) 3,452.0 Alternative Revenue Programs 4.8 10.2 (15.0) 2.2 — 13.6 15.8 Other Revenues 2.8 0.4 0.2 0.1 — — 3.5 Total Operating Revenues $ 2,386.3 $ 927.6 $ 435.2 $ 48.5 $ 383.5 $ (709.8) $ 3,471.3 For the Three Months Ended March 31, 2023 For the Three Months Ended March 31, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 762.2 $ 467.8 $ 234.0 $ 599.1 $ 404.6 $ 182.5 Commercial 295.3 384.3 108.6 242.2 331.3 88.4 Industrial 33.9 32.6 22.6 33.5 34.1 22.0 Total Retail Tariff Sales Revenues 1,091.4 884.7 365.2 874.8 770.0 292.9 Wholesale Transmission Revenues 195.8 167.8 71.4 209.1 165.2 71.9 Wholesale Market Sales Revenues 154.6 41.1 21.6 279.9 57.9 27.7 Other Revenues from Contracts with Customers 9.3 10.8 2.9 7.9 11.6 2.6 Amortization of Revenues Subject to Refund (1) 0.7 — — 58.4 — — Total Revenues from Contracts with Customers 1,451.8 1,104.4 461.1 1,430.1 1,004.7 395.1 Alternative Revenue Programs 24.6 (9.5) 9.6 1.3 (8.2) (3.3) Other Revenues 2.2 2.5 1.0 0.1 2.0 0.9 Eliminations (139.7) (141.1) (51.5) (145.7) (135.3) (53.3) Total Operating Revenues $ 1,338.9 $ 956.3 $ 420.2 $ 1,285.8 $ 863.2 $ 339.4

SEGMENT INFORMATION

SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 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 March 31, 2023 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 2,588.6 $ 1,045.2 $ 458.6 $ 50.3 $ 413.8 $ (760.9) $ 3,795.6 Depreciation and Amortization (22.0) (77.0) (89.9) (13.3) (36.8) 2.1 (236.9) Other Operating Expenses (2,342.3) (730.4) (128.2) (27.9) (339.6) 759.3 (2,809.1) Operating Income $ 224.3 $ 237.8 $ 240.5 $ 9.1 $ 37.4 $ 0.5 $ 749.6 Interest Expense $ (69.3) $ (21.2) $ (41.5) $ (9.4) $ (85.1) $ 32.0 $ (194.5) Other Income, Net 54.3 9.0 9.4 1.1 565.8 (550.6) 89.0 Net Income Attributable to Common Shareholders 165.5 170.3 155.1 1.5 516.9 (518.1) 491.2 Cash Flows Used for Investments in Plant 371.9 165.5 336.6 37.9 65.2 — 977.1 For the Three Months Ended March 31, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,386.3 $ 927.6 $ 435.2 $ 48.5 $ 383.5 $ (709.8) $ 3,471.3 Depreciation and Amortization (351.6) (51.9) (81.9) (12.3) (30.2) 1.6 (526.3) Other Operating Expenses (1,845.6) (657.3) (129.3) (27.1) (331.4) 708.8 (2,281.9) Operating Income $ 189.1 $ 218.4 $ 224.0 $ 9.1 $ 21.9 $ 0.6 $ 663.1 Interest Expense $ (59.4) $ (15.8) $ (33.2) $ (8.2) $ (46.8) $ 10.1 $ (153.3) Other Income, Net 47.6 10.1 8.9 2.2 495.9 (493.1) 71.6 Net Income Attributable to Common Shareholders 140.9 164.0 148.5 3.7 468.7 (482.4) 443.4 Cash Flows Used for Investments in Plant 280.5 127.3 266.9 27.8 62.1 — 764.6 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of March 31, 2023 $ 27,978.8 $ 8,127.8 $ 13,522.6 $ 2,804.2 $ 27,186.4 $ (25,514.6) $ 54,105.2 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_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 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 March 31, 2023 and December 31, 2022, and the results of operations, comprehensive income, common shareholders' equity and cash flows for the three months ended March 31, 2023 and 2022. The results of operations, comprehensive income and cash flows for the three months ended March 31, 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 March 31, 2023 adequately reflected the collection risk and net realizable value for its receivables. As of both March 31, 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)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Allowance for Uncollectible Accounts	The activity in the allowance for uncollectible accounts by portfolio segment as of March 31 st 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 Three 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 — 22.8 22.8 — 3.9 3.9 — 4.7 4.7 5.1 Uncollectible Costs Deferred (1) 43.7 14.3 58.0 34.3 2.7 37.0 (1.3) 5.4 4.1 1.2 Write-Offs (9.7) (26.3) (36.0) (7.3) (7.0) (14.3) (0.4) (10.3) (10.7) (2.2) Recoveries Collected 0.3 3.7 4.0 0.3 1.2 1.5 — 1.5 1.5 0.2 Ending Balance $ 318.7 $ 216.4 $ 535.1 $ 216.2 $ 37.2 $ 253.4 $ 42.0 $ 52.6 $ 94.6 $ 33.5 Three 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 — 17.1 17.1 — 3.8 3.8 — 4.7 4.7 2.5 Uncollectible Costs Deferred (1) 0.9 14.8 15.7 (4.0) (2.1) (6.1) (3.3) 5.4 2.1 1.0 Write-Offs (2.3) (22.0) (24.3) (1.1) (0.5) (1.6) (0.3) (10.6) (10.9) (1.8) Recoveries Collected 0.8 5.5 6.3 0.6 2.5 3.1 — 1.9 1.9 0.2 Ending Balance $ 225.5 $ 206.7 $ 432.2 $ 140.1 $ 40.4 $ 180.5 $ 39.7 $ 55.1 $ 94.8 $ 26.2 (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.
Components of Other Income, Net	The components of Other Income, Net on the statements of income were as follows: For the Three Months Ended March 31, 2023 March 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR Electric PSNH Eversource CL&P NSTAR Electric PSNH Pension, SERP and PBOP Non-Service $ 34.8 $ 9.5 $ 14.7 $ 4.2 $ 54.3 $ 15.9 $ 21.0 $ 6.6 AFUDC Equity 15.5 4.1 9.5 0.7 9.9 2.8 4.9 0.4 Equity in Earnings of Unconsolidated Affiliates 3.8 — 0.1 — 0.4 — — — Investment (Loss)/Income (1.7) (0.6) (0.5) (0.1) (0.2) (0.4) (0.3) 0.2 Interest Income 23.1 1.9 16.0 0.9 6.7 1.3 3.5 0.3 Other 13.5 — 0.1 — 0.5 — 0.1 — Total Other Income, Net $ 89.0 $ 14.9 $ 39.9 $ 5.7 $ 71.6 $ 19.6 $ 29.2 $ 7.5
Investments in Unconsolidated Affiliates	Eversource's investments included the following: Investment Balance (Millions of Dollars) Ownership Interest As of March 31, 2023 As of December 31, 2022 Offshore Wind Business - North East Offshore 50 % $ 2,159.2 $ 1,947.1 Natural Gas Pipeline - Algonquin Gas Transmission, LLC 15 % 117.5 118.8 Renewable Energy Investment Fund 90 % — 84.1 Other various 26.2 26.1 Total Investments in Unconsolidated Affiliates $ 2,302.9 $ 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 (Millions of Dollars) March 31, 2023 March 31, 2022 Eversource $ 55.0 $ 48.6 CL&P 43.1 37.8
Non-cash Investing Activities	Non-cash investing activities include plant additions included in Accounts Payable as follows: (Millions of Dollars) As of March 31, 2023 As of March 31, 2022 Eversource $ 400.8 $ 385.6 CL&P 101.9 102.1 NSTAR Electric 117.4 85.8 PSNH 54.6 49.5
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 March 31, 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 $ 36.0 $ 9.3 $ 0.6 $ 0.1 $ 374.6 $ 11.3 $ 327.7 $ 0.1 Restricted cash included in: Special Deposits 89.0 8.9 17.8 19.5 102.2 8.8 17.5 33.1 Marketable Securities 17.9 0.2 — 0.2 25.4 0.2 0.1 0.4 Other Long-Term Assets 19.9 — — 3.2 19.6 — — 3.2 Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows $ 162.8 $ 18.4 $ 18.4 $ 23.0 $ 521.8 $ 20.3 $ 345.3 $ 36.8

REGULATORY ACCOUNTING (Tables)

REGULATORY ACCOUNTING (Tables)	3 Months Ended
	Mar. 31, 2023
Regulated Operations [Abstract]
Components of Regulatory Assets	The components of regulatory assets were as follows: As of March 31, 2023 As of December 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Storm Costs, Net $ 1,658.7 $ 889.2 $ 564.9 $ 204.6 $ 1,379.1 $ 799.3 $ 484.4 $ 95.4 Regulatory Tracking Mechanisms 1,028.7 228.2 432.4 122.8 1,075.3 216.8 391.5 73.7 Benefit Costs 910.3 155.6 294.4 56.1 921.7 156.7 299.5 56.6 Income Taxes, Net 856.1 492.9 118.1 13.1 853.3 491.1 115.6 16.0 Securitized Stranded Costs 424.9 — — 424.9 435.7 — — 435.7 Goodwill-related 276.7 — 237.6 — 281.0 — 241.2 — Derivative Liabilities 168.8 168.8 — — 181.8 181.8 — — Asset Retirement Obligations 129.2 36.5 68.0 4.5 127.9 35.9 68.2 4.4 Other Regulatory Assets 286.5 25.3 107.9 12.5 322.5 26.2 114.0 14.4 Total Regulatory Assets 5,739.9 1,996.5 1,823.3 838.5 5,578.3 1,907.8 1,714.4 696.2 Less: Current Portion 1,332.0 356.5 559.8 140.9 1,335.5 314.1 492.8 102.2 Total Long-Term Regulatory Assets $ 4,407.9 $ 1,640.0 $ 1,263.5 $ 697.6 $ 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 March 31, 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 $ 2,601.8 $ 980.0 $ 933.9 $ 346.1 $ 2,619.3 $ 983.6 $ 944.3 $ 348.6 Cost of Removal 705.4 144.2 412.9 20.2 670.6 130.8 405.3 14.7 Regulatory Tracking Mechanisms 653.6 145.0 341.6 73.2 890.8 361.0 336.1 155.0 Deferred Portion of Non-Service Income 291.4 38.3 148.5 30.8 270.9 34.5 139.7 28.8 AFUDC - Transmission 103.8 49.8 54.0 — 98.2 48.2 50.0 — Benefit Costs 49.2 0.6 27.1 — 55.4 0.7 31.4 — Other Regulatory Liabilities 219.7 44.0 14.6 6.6 215.9 40.6 14.5 6.5 Total Regulatory Liabilities 4,624.9 1,401.9 1,932.6 476.9 4,821.1 1,599.4 1,921.3 553.6 Less: Current Portion 650.5 124.6 375.0 86.6 890.8 336.0 373.2 162.0 Total Long-Term Regulatory Liabilities $ 3,974.4 $ 1,277.3 $ 1,557.6 $ 390.3 $ 3,930.3 $ 1,263.4 $ 1,548.1 $ 391.6

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 (Millions of Dollars) Distribution - Electric $ 18,618.6 $ 18,326.2 Distribution - Natural Gas 7,562.8 7,443.8 Transmission - Electric 13,884.0 13,709.3 Distribution - Water 2,122.5 2,112.6 Solar 200.8 200.8 Utility 42,388.7 41,792.7 Other (1) 1,791.7 1,738.1 Property, Plant and Equipment, Gross 44,180.4 43,530.8 Less: Accumulated Depreciation Utility (9,317.7) (9,167.4) Other (744.7) (706.1) Total Accumulated Depreciation (10,062.4) (9,873.5) Property, Plant and Equipment, Net 34,118.0 33,657.3 Construction Work in Progress 2,626.9 2,455.5 Total Property, Plant and Equipment, Net $ 36,744.9 $ 36,112.8 As of March 31, 2023 As of December 31, 2022 (Millions of Dollars) CL&P NSTAR PSNH CL&P NSTAR PSNH Distribution - Electric $ 7,510.8 $ 8,516.7 $ 2,631.4 $ 7,370.1 $ 8,410.0 $ 2,586.4 Transmission - Electric 6,235.2 5,382.8 2,267.6 6,165.1 5,333.8 2,212.0 Solar — 200.8 — — 200.8 — Property, Plant and Equipment, Gross 13,746.0 14,100.3 4,899.0 13,535.2 13,944.6 4,798.4 Less: Accumulated Depreciation (2,610.4) (3,429.3) (940.0) (2,567.1) (3,381.2) (912.3) Property, Plant and Equipment, Net 11,135.6 10,671.0 3,959.0 10,968.1 10,563.4 3,886.1 Construction Work in Progress 494.7 1,148.0 189.0 498.9 1,063.6 174.1 Total Property, Plant and Equipment, Net $ 11,630.3 $ 11,819.0 $ 4,148.0 $ 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)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 17.0 $ (0.5) $ 16.5 $ 16.3 $ (0.5) $ 15.8 Long-Term Derivative Assets Level 3 24.9 (0.8) 24.1 28.8 (0.9) 27.9 Current Derivative Liabilities Level 3 (85.1) — (85.1) (81.6) — (81.6) Long-Term Derivative Liabilities Level 3 (124.3) — (124.3) (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.
Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used	The following is a summary of the significant unobservable inputs utilized in the valuations of the derivative contracts classified as Level 3: As of March 31, 2023 As of December 31, 2022 CL&P Range Average Period Covered Range Average Period Covered Forward Reserve Prices $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024 $ 0.44 — $0.50 $ 0.47 per kW-Month 2023 - 2024
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 March 31, (Millions of Dollars) 2023 2022 Derivatives, Net: Fair Value as of Beginning of Period $ (181.8) $ (249.2) Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets (1.9) 6.2 Settlements 14.9 13.6 Fair Value as of End of Period $ (168.8) $ (229.4)

MARKETABLE SECURITIES (Tables)

MARKETABLE SECURITIES (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 $ 196.5 $ 0.2 $ (14.8) $ 181.9 $ 201.6 $ 0.1 $ (16.2) $ 185.5
Contractual Maturities of Available-for-Sale Debt Securities	As of March 31, 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) $ 39.8 $ 38.9 One to five years 42.5 41.1 Six to ten years 35.6 32.8 Greater than ten years 78.6 69.1 Total Debt Securities $ 196.5 $ 181.9 (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. Amounts also include securities in Eversource’s non-qualified executive benefit trust, which are intended to be sold in 2023.
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 March 31, 2023 As of December 31, 2022 Level 1: Mutual Funds and Equities $ 190.5 $ 190.1 Money Market Funds 17.9 25.4 Total Level 1 $ 208.4 $ 215.5 Level 2: U.S. Government Issued Debt Securities (Agency and Treasury) $ 91.5 $ 82.3 Corporate Debt Securities 44.2 46.1 Asset-Backed Debt Securities 8.5 8.6 Municipal Bonds 9.2 12.7 Other Fixed Income Securities 10.6 10.4 Total Level 2 $ 164.0 $ 160.1 Total Marketable Securities $ 372.4 $ 375.6

SHORT-TERM AND LONG-TERM DEBT (

SHORT-TERM AND LONG-TERM DEBT (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 March 31, 2023 December 31, 2022 (Millions of Dollars) Eversource Parent Commercial Paper Program $ 1,048.0 $ 1,442.2 $ 952.0 $ 557.8 5.22 % 4.63 % NSTAR Electric Commercial Paper Program 147.5 — 502.5 650.0 4.77 % — %
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 PSNH Series W First Mortgage Bonds 5.15 % 300.0 January 2023 January 2053 Repaid short-term debt, paid capital expenditures and working capital 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

RATE REDUCTION BONDS AND VARI_2

RATE REDUCTION BONDS AND VARIABLE INTEREST ENTITIES (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 Restricted Cash - Current Portion (included in Current Assets) $ 18.7 $ 32.4 Restricted Cash - Long-Term Portion (included in Other Long-Term Assets) 3.2 3.2 Securitized Stranded Cost (included in Regulatory Assets) 424.9 435.7 Other Regulatory Liabilities (included in Regulatory Liabilities) 8.8 6.0 Accrued Interest (included in Other Current Liabilities) 2.7 6.9 Rate Reduction Bonds - Current Portion 43.2 43.2 Rate Reduction Bonds - Long-Term Portion 388.9 410.5 (Millions of Dollars) PSNH Income Statements: For the Three Months Ended March 31, 2023 March 31, 2022 Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net) $ 10.8 $ 10.8 Interest Expense on RRB Principal (included in Interest Expense) 4.1 4.4

PENSION BENEFITS AND POSTRETI_2

PENSION BENEFITS AND POSTRETIREMENT BENEFITS OTHER THAN PENSION (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 For the Three Months Ended March 31, 2023 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 11.0 $ 3.0 $ 2.1 $ 1.1 $ 1.8 $ 0.3 $ 0.3 $ 0.2 Interest Cost 63.7 12.6 13.5 6.8 8.5 1.6 2.3 0.9 Expected Return on Plan Assets (115.9) (23.4) (28.4) (12.3) (19.1) (2.4) (9.2) (1.4) Actuarial Loss 12.5 0.8 4.9 0.4 — — — — Prior Service Cost/(Credit) 0.3 — 0.1 — (5.4) 0.3 (4.2) 0.1 Total Net Periodic Benefit Plan Income $ (28.4) $ (7.0) $ (7.8) $ (4.0) $ (14.2) $ (0.2) $ (10.8) $ (0.2) Intercompany Income Allocations N/A $ (2.0) $ (1.7) $ (0.5) N/A $ (0.5) $ (0.6) $ (0.2) Pension and SERP PBOP For the Three Months Ended March 31, 2022 For the Three Months Ended March 31, 2022 (Millions of Dollars) Eversource CL&P NSTAR PSNH Eversource CL&P NSTAR PSNH Service Cost $ 17.7 $ 4.5 $ 3.6 $ 1.8 $ 2.8 $ 0.5 $ 0.5 $ 0.2 Interest Cost 38.6 7.8 8.1 4.2 5.0 0.9 1.3 0.5 Expected Return on Plan Assets (131.7) (26.6) (32.0) (14.1) (22.4) (2.8) (10.6) (1.6) Actuarial Loss 30.7 4.2 8.5 2.2 — — — — Prior Service Cost/(Credit) 0.4 — 0.1 — (5.4) 0.2 (4.3) 0.1 Total Net Periodic Benefit Plan Income $ (44.3) $ (10.1) $ (11.7) $ (5.9) $ (20.0) $ (1.2) $ (13.1) $ (0.8) Intercompany Income Allocations N/A $ (3.8) $ (2.9) $ (0.8) N/A $ (0.9) $ (0.9) $ (0.3)

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 As of December 31, 2022 Number of Sites Reserve Number of Sites Reserve Eversource 59 $ 121.2 59 $ 122.6 CL&P 13 13.6 13 13.9 NSTAR Electric 10 3.4 10 3.4 PSNH 8 6.1 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 March 31, 2023 Company (Obligor) Description Maximum Exposure Expiration Dates North East Offshore LLC Construction-related purchase agreements with third-party contractors (1) $ 726.2 (1) Sunrise Wind LLC Construction-related purchase agreements with third-party contractors (2) 668.6 2025 - 2028 Revolution Wind, LLC Construction-related purchase agreements with third-party contractors (3) 409.7 2024 - 2027 South Fork Wind, LLC Construction-related purchase agreements with third-party contractors (4) 126.2 2023 - 2026 Eversource Investment LLC Funding and indemnification obligations of North East Offshore LLC (5) 68.9 (5) South Fork Wind, LLC Power Purchase Agreement Security (6) 7.1 (6) Sunrise Wind LLC OREC capacity production (7) 11.0 (7) Bay State Wind LLC Real estate purchase 2.5 2023 South Fork Wind, LLC Transmission interconnection 1.2 — Eversource Investment LLC Letters of Credit (8) 4.3 — Various Surety bonds (9) 37.2 2023 - 2024 Eversource Service Lease payments for real estate 0.4 2024 (1) Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party 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 5, 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 $838.4 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from 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 $547.1 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 $207.7 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from June 2023 and August 2026 and (ii) full performance of the guaranteed obligations. (5) Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the 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. (6) 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. (7) 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. (8) On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. 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. (9) 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)	3 Months Ended
	Mar. 31, 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 March 31, 2023: Preferred Stock Not Subject to Mandatory Redemption $ 155.6 $ 137.1 $ 116.2 $ 100.8 $ 43.0 $ 36.3 $ — $ — Long-Term Debt 22,178.0 20,650.5 4,310.2 4,096.9 4,426.0 4,217.4 1,459.4 1,331.7 Rate Reduction Bonds 432.1 417.3 — — — — 432.1 417.3 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)	3 Months Ended
	Mar. 31, 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 Three Months Ended March 31, 2023 For the Three Months Ended March 31, 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 — — — — — (0.8) — (0.8) Amounts Reclassified from AOCI — 1.2 2.0 3.2 — — 1.5 1.5 Net OCI — 1.2 2.0 3.2 — (0.8) 1.5 0.7 Balance as of End of Period $ (0.4) $ — $ (35.8) $ (36.2) $ (0.4) $ (0.4) $ (40.8) $ (41.6)

COMMON SHARES (Tables)

COMMON SHARES (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 and December 31, 2022 Issued as of Par Value March 31, 2023 December 31, 2022 Eversource $ 5 380,000,000 359,984,073 359,984,073 CL&P $ 10 24,500,000 6,035,205 6,035,205 NSTAR Electric $ 1 100,000,000 200 200 PSNH $ 1 100,000,000 301 301

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 March 31, 2022 Net Income Attributable to Common Shareholders $ 491.2 $ 443.4 Weighted Average Common Shares Outstanding: Basic 349,217,147 345,156,346 Dilutive Effect 394,866 504,787 Diluted 349,612,013 345,661,133 Basic and Diluted EPS $ 1.41 $ 1.28

REVENUES (Tables)

REVENUES (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2023 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,464.0 $ 576.6 $ — $ 28.9 $ — $ — $ 2,069.5 Commercial 788.4 320.0 — 15.5 — (1.0) 1,122.9 Industrial 89.1 69.6 — 1.1 — (5.1) 154.7 Total Retail Tariff Sales Revenues 2,341.5 966.2 — 45.5 — (6.1) 3,347.1 Wholesale Transmission Revenues — — 435.0 — — (325.3) 109.7 Wholesale Market Sales Revenues 217.3 49.1 — 0.8 — — 267.2 Other Revenues from Contracts with Customers 18.3 1.5 4.7 2.1 413.8 (412.6) 27.8 Total Revenues from Contracts with Customers 2,577.1 1,016.8 439.7 48.4 413.8 (744.0) 3,751.8 Alternative Revenue Programs 6.0 27.4 18.7 1.7 — (16.9) 36.9 Other Revenues 5.5 1.0 0.2 0.2 — — 6.9 Total Operating Revenues $ 2,588.6 $ 1,045.2 $ 458.6 $ 50.3 $ 413.8 $ (760.9) $ 3,795.6 For the Three Months Ended March 31, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Revenues from Contracts with Customers Retail Tariff Sales Residential $ 1,186.2 $ 556.8 $ — $ 28.2 $ — $ — $ 1,771.2 Commercial 661.3 257.6 — 14.6 — (1.1) 932.4 Industrial 89.6 68.1 — 1.1 — (4.5) 154.3 Total Retail Tariff Sales Revenues 1,937.1 882.5 — 43.9 — (5.6) 2,857.9 Wholesale Transmission Revenues — — 446.2 — 24.4 (364.7) 105.9 Wholesale Market Sales Revenues 365.5 33.5 — 0.8 — — 399.8 Other Revenues from Contracts with Customers 17.7 1.0 3.8 1.9 359.1 (353.1) 30.4 Amortization of/(Reserve for) Revenues Subject to Refund (1) 58.4 — — (0.4) — — 58.0 Total Revenues from Contracts with Customers 2,378.7 917.0 450.0 46.2 383.5 (723.4) 3,452.0 Alternative Revenue Programs 4.8 10.2 (15.0) 2.2 — 13.6 15.8 Other Revenues 2.8 0.4 0.2 0.1 — — 3.5 Total Operating Revenues $ 2,386.3 $ 927.6 $ 435.2 $ 48.5 $ 383.5 $ (709.8) $ 3,471.3 For the Three Months Ended March 31, 2023 For the Three Months Ended March 31, 2022 (Millions of Dollars) CL&P NSTAR Electric PSNH CL&P NSTAR Electric PSNH Revenues from Contracts with Customers Retail Tariff Sales Residential $ 762.2 $ 467.8 $ 234.0 $ 599.1 $ 404.6 $ 182.5 Commercial 295.3 384.3 108.6 242.2 331.3 88.4 Industrial 33.9 32.6 22.6 33.5 34.1 22.0 Total Retail Tariff Sales Revenues 1,091.4 884.7 365.2 874.8 770.0 292.9 Wholesale Transmission Revenues 195.8 167.8 71.4 209.1 165.2 71.9 Wholesale Market Sales Revenues 154.6 41.1 21.6 279.9 57.9 27.7 Other Revenues from Contracts with Customers 9.3 10.8 2.9 7.9 11.6 2.6 Amortization of Revenues Subject to Refund (1) 0.7 — — 58.4 — — Total Revenues from Contracts with Customers 1,451.8 1,104.4 461.1 1,430.1 1,004.7 395.1 Alternative Revenue Programs 24.6 (9.5) 9.6 1.3 (8.2) (3.3) Other Revenues 2.2 2.5 1.0 0.1 2.0 0.9 Eliminations (139.7) (141.1) (51.5) (145.7) (135.3) (53.3) Total Operating Revenues $ 1,338.9 $ 956.3 $ 420.2 $ 1,285.8 $ 863.2 $ 339.4

SEGMENT INFORMATION (Tables)

SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Summary of Segment Information and Segmented Total Assets	Eversource's segment information is as follows: For the Three Months Ended March 31, 2023 Eversource (Millions of Dollars) Electric Distribution Natural Gas Distribution Electric Transmission Water Distribution Other Eliminations Total Operating Revenues $ 2,588.6 $ 1,045.2 $ 458.6 $ 50.3 $ 413.8 $ (760.9) $ 3,795.6 Depreciation and Amortization (22.0) (77.0) (89.9) (13.3) (36.8) 2.1 (236.9) Other Operating Expenses (2,342.3) (730.4) (128.2) (27.9) (339.6) 759.3 (2,809.1) Operating Income $ 224.3 $ 237.8 $ 240.5 $ 9.1 $ 37.4 $ 0.5 $ 749.6 Interest Expense $ (69.3) $ (21.2) $ (41.5) $ (9.4) $ (85.1) $ 32.0 $ (194.5) Other Income, Net 54.3 9.0 9.4 1.1 565.8 (550.6) 89.0 Net Income Attributable to Common Shareholders 165.5 170.3 155.1 1.5 516.9 (518.1) 491.2 Cash Flows Used for Investments in Plant 371.9 165.5 336.6 37.9 65.2 — 977.1 For the Three Months Ended March 31, 2022 Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total Operating Revenues $ 2,386.3 $ 927.6 $ 435.2 $ 48.5 $ 383.5 $ (709.8) $ 3,471.3 Depreciation and Amortization (351.6) (51.9) (81.9) (12.3) (30.2) 1.6 (526.3) Other Operating Expenses (1,845.6) (657.3) (129.3) (27.1) (331.4) 708.8 (2,281.9) Operating Income $ 189.1 $ 218.4 $ 224.0 $ 9.1 $ 21.9 $ 0.6 $ 663.1 Interest Expense $ (59.4) $ (15.8) $ (33.2) $ (8.2) $ (46.8) $ 10.1 $ (153.3) Other Income, Net 47.6 10.1 8.9 2.2 495.9 (493.1) 71.6 Net Income Attributable to Common Shareholders 140.9 164.0 148.5 3.7 468.7 (482.4) 443.4 Cash Flows Used for Investments in Plant 280.5 127.3 266.9 27.8 62.1 — 764.6 The following table summarizes Eversource's segmented total assets: Eversource (Millions of Dollars) Electric Natural Gas Electric Water Distribution Other Eliminations Total As of March 31, 2023 $ 27,978.8 $ 8,127.8 $ 13,522.6 $ 2,804.2 $ 27,186.4 $ (25,514.6) $ 54,105.2 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
	Mar. 21, 2023 USD ($)	Mar. 31, 2023 USD ($) regulatedUtility project customer	Dec. 31, 2022 USD ($)	May 04, 2022	Mar. 31, 2022 USD ($)	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		$ 535,100,000	$ 486,300,000		$ 432,200,000	$ 417,400,000
Number of offshore wind projects | project		3
Energy Relief Fund - Merrimack Valley Programs
Summary of Accounting Policies [Line Items]
Restricted cash, current		$ 20,000,000	20,000,000
Restricted cash, noncurrent		16,700,000	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
CL&P
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts		$ 253,400,000	225,300,000		180,500,000	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
NSTAR Electric
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts		94,600,000	95,000,000		94,800,000	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
PSNH
Summary of Accounting Policies [Line Items]
Allowance for uncollectible accounts for late fees and other receivable amounts		33,500,000	29,200,000		$ 26,200,000	$ 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
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%
North East Offshore LLC
Summary of Accounting Policies [Line Items]
Ownership interest (percent)		50%
Renewable Energy Investment Fund
Summary of Accounting Policies [Line Items]
Ownership interest (percent)		90%
Proceeds from sale of equity method investments	$ 123,400,000
Renewable Energy Investment Fund | Equity Method Investee
Summary of Accounting Policies [Line Items]
Charitable contributions		$ 20,000,000

SUMMARY OF SIGNIFICANT ACCOUN_5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Provision for Uncollectible Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 486,300	$ 417,400
Uncollectible Expense	22,821	17,135
Uncollectible Costs Deferred	58,000	15,700
Write-Offs	(36,000)	(24,300)
Recoveries Collected	4,000	6,300
Ending Balance	535,100	432,200
CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	225,300	181,300
Uncollectible Expense	3,876	3,776
Uncollectible Costs Deferred	37,000	(6,100)
Write-Offs	(14,300)	(1,600)
Recoveries Collected	1,500	3,100
Ending Balance	253,400	180,500
NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	95,000	97,000
Uncollectible Expense	4,697	4,662
Uncollectible Costs Deferred	4,100	2,100
Write-Offs	(10,700)	(10,900)
Recoveries Collected	1,500	1,900
Ending Balance	94,600	94,800
PSNH
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	29,200	24,300
Uncollectible Expense	5,060	2,496
Uncollectible Costs Deferred	1,200	1,000
Write-Offs	(2,200)	(1,800)
Recoveries Collected	200	200
Ending Balance	33,500	26,200
Hardship Accounts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	284,400	226,100
Uncollectible Expense	0	0
Uncollectible Costs Deferred	43,700	900
Write-Offs	(9,700)	(2,300)
Recoveries Collected	300	800
Ending Balance	318,700	225,500
Hardship Accounts | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	188,900	144,600
Uncollectible Expense	0	0
Uncollectible Costs Deferred	34,300	(4,000)
Write-Offs	(7,300)	(1,100)
Recoveries Collected	300	600
Ending Balance	216,200	140,100
Hardship Accounts | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	43,700	43,300
Uncollectible Expense	0	0
Uncollectible Costs Deferred	(1,300)	(3,300)
Write-Offs	(400)	(300)
Recoveries Collected	0	0
Ending Balance	42,000	39,700
Retail (Non-Hardship), Wholesale, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	201,900	191,300
Uncollectible Expense	22,800	17,100
Uncollectible Costs Deferred	14,300	14,800
Write-Offs	(26,300)	(22,000)
Recoveries Collected	3,700	5,500
Ending Balance	216,400	206,700
Retail (Non-Hardship), Wholesale, and Other | CL&P
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	36,400	36,700
Uncollectible Expense	3,900	3,800
Uncollectible Costs Deferred	2,700	(2,100)
Write-Offs	(7,000)	(500)
Recoveries Collected	1,200	2,500
Ending Balance	37,200	40,400
Retail (Non-Hardship), Wholesale, and Other | NSTAR Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	51,300	53,700
Uncollectible Expense	4,700	4,700
Uncollectible Costs Deferred	5,400	5,400
Write-Offs	(10,300)	(10,600)
Recoveries Collected	1,500	1,900
Ending Balance	$ 52,600	$ 55,100

SUMMARY OF SIGNIFICANT ACCOUN_6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Summary of Accounting Policies [Line Items]
Other income, net	$ 88,981	$ 71,561
Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	34,800	54,300
AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	15,500	9,900
Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	3,800	400
Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(1,700)	(200)
Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	23,100	6,700
Other
Summary of Accounting Policies [Line Items]
Other income, net	13,500	500
CL&P
Summary of Accounting Policies [Line Items]
Other income, net	14,937	19,564
CL&P | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	9,500	15,900
CL&P | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	4,100	2,800
CL&P | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0
CL&P | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(600)	(400)
CL&P | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	1,900	1,300
CL&P | Other
Summary of Accounting Policies [Line Items]
Other income, net	0	0
NSTAR Electric
Summary of Accounting Policies [Line Items]
Other income, net	39,873	29,231
NSTAR Electric | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	14,700	21,000
NSTAR Electric | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	9,500	4,900
NSTAR Electric | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	100	0
NSTAR Electric | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(500)	(300)
NSTAR Electric | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	16,000	3,500
NSTAR Electric | Other
Summary of Accounting Policies [Line Items]
Other income, net	100	100
PSNH
Summary of Accounting Policies [Line Items]
Other income, net	5,717	7,509
PSNH | Pension, SERP and PBOP Non-Service   Income Components, Net of Deferred Portion
Summary of Accounting Policies [Line Items]
Other income, net	4,200	6,600
PSNH | AFUDC Equity
Summary of Accounting Policies [Line Items]
Other income, net	700	400
PSNH | Equity in Earnings of Unconsolidated Affiliates
Summary of Accounting Policies [Line Items]
Other income, net	0	0
PSNH | Investment Income/(Loss)
Summary of Accounting Policies [Line Items]
Other income, net	(100)	200
PSNH | Interest Income
Summary of Accounting Policies [Line Items]
Other income, net	900	300
PSNH | Other
Summary of Accounting Policies [Line Items]
Other income, net	$ 0	$ 0

SUMMARY OF SIGNIFICANT ACCOUN_7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,302,880	$ 2,176,080
Offshore Wind Business - North East Offshore
Schedule of Equity Method Investments [Line Items]
Ownership interest (percent)	50%
Investments in unconsolidated affiliates	$ 2,159,200	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	$ 117,500	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	$ 26,200	$ 26,100

SUMMARY OF SIGNIFICANT ACCOUN_8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 55	$ 48.6
CL&P
Schedule of Gross Tax Receipts [Line Items]
Gross receipts taxes	$ 43.1	$ 37.8

SUMMARY OF SIGNIFICANT ACCOUN_9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-cash Investing Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 400.8	$ 385.6
CL&P
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	101.9	102.1
NSTAR Electric
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	117.4	85.8
PSNH
Schedule of Supplemental Cash Flow [Line Items]
Plant additions included in accounts payable	$ 54.6	$ 49.5

SUMMARY OF SIGNIFICANT ACCOU_10

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash Balances to Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	$ 36,000	$ 374,600
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	162,767	521,752	$ 164,589	$ 221,008
Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	89,000	102,200
Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,900	25,400
Other Long-Term Assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	19,900	19,600
CL&P
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents as reported on the Balance Sheets	9,300	11,300
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	18,409	20,327	30,584	74,788
CL&P | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	8,900	8,800
CL&P | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	200	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	600	327,700
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	18,355	345,293	18,144	18,179
NSTAR Electric | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	17,800	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	100	100
Cash, Cash Equivalents and Restricted Cash as reported on the Statements of Cash Flows	23,012	36,812	$ 24,058	$ 35,126
PSNH | Special Deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	19,500	33,100
PSNH | Marketable Securities
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	200	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	Mar. 31, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 5,739,900	$ 5,578,300
Less:  Current Portion	1,332,028	1,335,491
Total Long-Term Regulatory Assets	4,407,875	4,242,794
Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	1,658,700	1,379,100
Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	1,028,700	1,075,300
Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	910,300	921,700
Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	856,100	853,300
Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	424,900	435,700
Goodwill-related
Regulatory Assets [Line Items]
Total Regulatory Assets	276,700	281,000
Derivative Liabilities
Regulatory Assets [Line Items]
Total Regulatory Assets	168,800	181,800
Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	129,200	127,900
Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	286,500	322,500
CL&P
Regulatory Assets [Line Items]
Total Regulatory Assets	1,996,500	1,907,800
Less:  Current Portion	356,468	314,089
Total Long-Term Regulatory Assets	1,639,960	1,593,693
CL&P | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	889,200	799,300
CL&P | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	228,200	216,800
CL&P | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	155,600	156,700
CL&P | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	492,900	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	168,800	181,800
CL&P | Asset Retirement Obligations
Regulatory Assets [Line Items]
Total Regulatory Assets	36,500	35,900
CL&P | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	25,300	26,200
NSTAR Electric
Regulatory Assets [Line Items]
Total Regulatory Assets	1,823,300	1,714,400
Less:  Current Portion	559,758	492,759
Total Long-Term Regulatory Assets	1,263,534	1,221,619
NSTAR Electric | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	564,900	484,400
NSTAR Electric | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	432,400	391,500
NSTAR Electric | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	294,400	299,500
NSTAR Electric | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	118,100	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	237,600	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	68,000	68,200
NSTAR Electric | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	107,900	114,000
PSNH
Regulatory Assets [Line Items]
Total Regulatory Assets	838,500	696,200
Less:  Current Portion	140,912	102,240
Total Long-Term Regulatory Assets	697,568	593,974
PSNH | Storm Costs, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	204,600	95,400
PSNH | Regulatory Tracking Mechanisms
Regulatory Assets [Line Items]
Total Regulatory Assets	122,800	73,700
PSNH | Benefit Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	56,100	56,600
PSNH | Income Taxes, Net
Regulatory Assets [Line Items]
Total Regulatory Assets	13,100	16,000
PSNH | Securitized Stranded Costs
Regulatory Assets [Line Items]
Total Regulatory Assets	424,900	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	4,500	4,400
PSNH | Other Regulatory Assets
Regulatory Assets [Line Items]
Total Regulatory Assets	$ 12,500	$ 14,400

REGULATORY ACCOUNTING - Narrati

REGULATORY ACCOUNTING - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 223.6	$ 210.8
COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	29.8	29.8
CL&P
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	146.5	135.9
CL&P | COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	11.8	11.8
NSTAR Electric
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	19.7	19.8
NSTAR Electric | COVID-19
Regulatory Assets [Line Items]
Net incremental deferred costs	2.2	2.2
PSNH
Regulatory Assets [Line Items]
Amount of regulatory costs not yet approved	$ 1.1	$ 1

REGULATORY ACCOUNTING - Compo_2

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	$ 4,624,900	$ 4,821,100
Less:  Current Portion	650,538	890,786
Total Long-Term Regulatory Liabilities	3,974,374	3,930,305
EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	2,601,800	2,619,300
Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	705,400	670,600
Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	653,600	890,800
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	291,400	270,900
AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	103,800	98,200
Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	49,200	55,400
Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	219,700	215,900
CL&P
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,401,900	1,599,400
Less:  Current Portion	124,640	336,048
Total Long-Term Regulatory Liabilities	1,277,281	1,263,396
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	980,000	983,600
CL&P | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	144,200	130,800
CL&P | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	145,000	361,000
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	38,300	34,500
CL&P | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	49,800	48,200
CL&P | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	600	700
CL&P | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	44,000	40,600
NSTAR Electric
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	1,932,600	1,921,300
Less:  Current Portion	375,047	373,221
Total Long-Term Regulatory Liabilities	1,557,614	1,548,081
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	933,900	944,300
NSTAR Electric | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	412,900	405,300
NSTAR Electric | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	341,600	336,100
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	148,500	139,700
NSTAR Electric | AFUDC - Transmission
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	54,000	50,000
NSTAR Electric | Benefit Costs
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	27,100	31,400
NSTAR Electric | Other Regulatory Liabilities
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	14,600	14,500
PSNH
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	476,900	553,600
Less:  Current Portion	86,569	161,963
Total Long-Term Regulatory Liabilities	390,290	391,628
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	346,100	348,600
PSNH | Cost of Removal
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	20,200	14,700
PSNH | Regulatory Tracking Mechanisms
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	73,200	155,000
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP
Regulatory Liabilities [Line Items]
Total Regulatory Liabilities	30,800	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	$ 6,600	$ 6,500

PROPERTY, PLANT AND EQUIPMENT_3

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	$ 18,618,600	$ 18,326,200
Distribution - Natural Gas	7,562,800	7,443,800
Transmission - Electric	13,884,000	13,709,300
Distribution - Water	2,122,500	2,112,600
Solar	200,800	200,800
Utility	42,388,700	41,792,700
Other	1,791,700	1,738,100
Property, Plant and Equipment, Gross	44,180,400	43,530,800
Less:  Accumulated Depreciation
Utility	(9,317,700)	(9,167,400)
Other	(744,700)	(706,100)
Total Accumulated Depreciation	(10,062,400)	(9,873,500)
Property, Plant and Equipment, Net	34,118,000	33,657,300
Construction Work in Progress	2,626,900	2,455,500
Total Property, Plant and Equipment, Net	36,744,855	36,112,820
CL&P
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	7,510,800	7,370,100
Transmission - Electric	6,235,200	6,165,100
Solar	0	0
Property, Plant and Equipment, Gross	13,746,000	13,535,200
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(2,610,400)	(2,567,100)
Property, Plant and Equipment, Net	11,135,600	10,968,100
Construction Work in Progress	494,700	498,900
Total Property, Plant and Equipment, Net	11,630,278	11,467,024
NSTAR Electric
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	8,516,700	8,410,000
Transmission - Electric	5,382,800	5,333,800
Solar	200,800	200,800
Property, Plant and Equipment, Gross	14,100,300	13,944,600
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(3,429,300)	(3,381,200)
Property, Plant and Equipment, Net	10,671,000	10,563,400
Construction Work in Progress	1,148,000	1,063,600
Total Property, Plant and Equipment, Net	11,819,012	11,626,968
PSNH
Public Utility, Property, Plant and Equipment [Line Items]
Distribution - Electric	2,631,400	2,586,400
Transmission - Electric	2,267,600	2,212,000
Solar	0	0
Property, Plant and Equipment, Gross	4,899,000	4,798,400
Less:  Accumulated Depreciation
Total Accumulated Depreciation	(940,000)	(912,300)
Property, Plant and Equipment, Net	3,959,000	3,886,100
Construction Work in Progress	189,000	174,100
Total Property, Plant and Equipment, Net	$ 4,147,985	$ 4,060,224

DERIVATIVE INSTRUMENTS - Gross

DERIVATIVE INSTRUMENTS - Gross Fair Values and Net Amounts of Contracts (Details) - CL&P - Level 3 - USD ($) $ in Millions	Mar. 31, 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	$ 17	$ 16.3
Netting	(0.5)	(0.5)
Net Amount Recorded as a Derivative	16.5	15.8
Other Long-Term Assets
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Commodity Supply and Price Risk Management	24.9	28.8
Netting	(0.8)	(0.9)
Net Amount Recorded as a Derivative	24.1	27.9
Current Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(85.1)	(81.6)
Netting	0	0
Net Amount Recorded as a Derivative	(85.1)	(81.6)
Long-Term Derivative Liabilities
Current and Long-Term Derivative Liabilities
Commodity Supply and Price Risk Management	(124.3)	(143.9)
Netting	0	0
Net Amount Recorded as a Derivative	$ (124.3)	$ (143.9)

DERIVATIVE INSTRUMENTS - Narrat

DERIVATIVE INSTRUMENTS - Narrative (Details) - MW	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts by United Illuminated Company	20%
Amount of power to be purchased under capacity-related contract (in MW)	674	674
Level 3 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts	2.30%
Level 3 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts	6.60%
Level 3 | Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of exit price premiums related to derivative contracts	5.50%
CL&P
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of costs or benefits borne under capacity-related contracts	80%

DERIVATIVE INSTRUMENTS - Summar

DERIVATIVE INSTRUMENTS - Summary of Level 3 Derivative Contracts and Significant Unobservable Inputs Used (Details) - CL&P - Forward Reserve Prices - Level 3 - $ / KWmo	Mar. 31, 2023	Dec. 31, 2022
Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.44	0.44
Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.50	0.50
Weighted Average
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative measurement input	0.47	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
	Mar. 31, 2023	Mar. 31, 2022
Derivatives, Net [Rollforward]
Fair Value as of Beginning of Period	$ (181.8)	$ (249.2)
Net Realized/Unrealized (Losses)/Gains Included in Regulatory Assets	(1.9)	6.2
Settlements	14.9	13.6
Fair Value as of End of Period	$ (168.8)	$ (229.4)

MARKETABLE SECURITIES - Narrati

MARKETABLE SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale equity securities	$ 19.6		$ 20
Unrealized (loss) gain recorded in other income	0.8	$ (4.4)
Losses recorded on securities intended to be sold	3.2	1.5
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	170.9		170.1
Marketable securities held in nuclear decommissioning trust	$ 161.2		$ 163.2

MARKETABLE SECURITIES - Summary

MARKETABLE SECURITIES - Summary of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Amortized Cost	$ 196.5	$ 201.6
Pre-Tax Unrealized Gains	0.2	0.1
Pre-Tax Unrealized Losses	(14.8)	(16.2)
Fair Value	$ 181.9	$ 185.5

MARKETABLE SECURITIES - Contrac

MARKETABLE SECURITIES - Contractual Maturities of Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Less than one year	$ 39.8
One to five years	42.5
Six to ten years	35.6
Greater than ten years	78.6
Amortized Cost	196.5	$ 201.6
Fair Value
Less than one year	38.9
One to five years	41.1
Six to ten years	32.8
Greater than ten years	69.1
Fair Value	$ 181.9	$ 185.5

MARKETABLE SECURITIES - Marketa

MARKETABLE SECURITIES - Marketable Securities Recorded at Fair Value on a Recurring Basis by Level (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 372.4	$ 375.6
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	208.4	215.5
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	164	160.1
Mutual Funds and Equities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	190.5	190.1
Money Market Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	17.9	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	91.5	82.3
Corporate Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	44.2	46.1
Asset-Backed Debt Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	8.5	8.6
Municipal Bonds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	9.2	12.7
Other Fixed Income Securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 10.6	$ 10.4

SHORT-TERM AND LONG-TERM DEBT -

SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
CL&P
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	$ 318,000,000
PSNH
Line of Credit Facility [Line Items]
Notes payable to Eversource parent	121,100,000	$ 173,300,000
Line of Credit | CL&P
Line of Credit Facility [Line Items]
Maximum borrowing capacity	450,000,000
Amount outstanding under line of credit	0
Line of Credit | PSNH
Line of Credit Facility [Line Items]
Maximum borrowing capacity	300,000,000
Amount outstanding under line of credit	0
Commercial Paper | NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Line of Credit
Line of Credit Facility [Line Items]
Amount outstanding under line of credit	0	$ 0
Line of Credit | NSTAR Electric
Line of Credit Facility [Line Items]
Maximum borrowing capacity	650,000,000
Eversource Parent | Commercial Paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,000,000,000
Eversource Parent | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000,000,000
Debt instrument term	5 years
NSTAR Electric | Line of Credit | NSTAR Electric
Line of Credit Facility [Line Items]
Debt instrument term	5 years

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	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Borrowings outstanding	$ 1,048	$ 1,442.2
Available borrowing capacity	$ 952	$ 557.8
Weighted-average interest rate (in percent)	5.22%	4.63%
NSTAR Electric
Debt Instrument [Line Items]
Borrowings outstanding	$ 147.5	$ 0
Available borrowing capacity	$ 502.5	$ 650
Weighted-average interest rate (in percent)	4.77%	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			3 Months Ended
	May 31, 2023	Mar. 31, 2023	Jan. 31, 2023	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
Retirement of Long-Term Debt				$ (400,000)	$ (770,000)
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			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			2.50%
Retirement of Long-Term Debt			$ (400,000)
PSNH | First Mortgage | PSNH Series W First Mortgage Bonds
Debt Instrument [Line Items]
Interest rate, stated percentage			5.15%
Issuances			$ 300,000
Eversource Parent | Senior Notes | Eversource Parent Series Z Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		5.45%		5.45%
Issuances		$ 750,000
Eversource Parent | Senior Notes | Eversource Parent Series F Senior Notes | Forecast
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%
Eversource Parent | Senior Notes | Eversource Parent Series F Senior Notes | Subsequent Event | Forecast
Debt Instrument [Line Items]
Retirement of Long-Term Debt	$ (450,000)

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	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	Mar. 31, 2023	Dec. 31, 2022
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	$ 5,739,900	$ 5,578,300
Regulatory Liabilities	3,974,374	3,930,305
Accrued Interest (included in Other Current Liabilities)	1,078,421	989,053
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	388,887	410,492
Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	424,900	435,700
Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	286,500	322,500
Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	89,000	102,200
Other Long-Term Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	19,900	19,600
PSNH
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	838,500	696,200
Regulatory Liabilities	390,290	391,628
Accrued Interest (included in Other Current Liabilities)	62,784	59,616
Rate Reduction Bonds - Current Portion	43,210	43,210
Rate Reduction Bonds - Long-Term Portion	388,887	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	388,900	410,500
PSNH | Securitized Stranded Costs
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	424,900	435,700
PSNH | Securitized Stranded Costs | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	424,900	435,700
PSNH | Other Regulatory Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Securitized Stranded Cost (included in Regulatory Assets)	12,500	14,400
PSNH | Other Regulatory Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Regulatory Liabilities	8,800	6,000
Accrued Interest (included in Other Current Liabilities)	2,700	6,900
PSNH | Current Derivative Assets
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	19,500	33,100
PSNH | Current Derivative Assets | VIE
Condensed Balance Sheet Statements, Captions [Line Items]
Restricted Cash	18,700	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
	Mar. 31, 2023	Mar. 31, 2022
Condensed Income Statements, Captions [Line Items]
Interest Expense on RRB Principal (included in Interest Expense)	$ 194,543	$ 153,245
PSNH
Condensed Income Statements, Captions [Line Items]
Amortization of RRB Principal (included in Amortization of Regulatory Assets, Net)	5,317	(26,834)
Interest Expense on RRB Principal (included in Interest Expense)	17,542	13,645
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
Interest Expense on RRB Principal (included in Interest Expense)	$ 4,100	$ 4,400

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
	Mar. 31, 2023	Mar. 31, 2022
Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 11	$ 17.7
Interest Cost	63.7	38.6
Expected Return on Plan Assets	(115.9)	(131.7)
Actuarial Losses, net	12.5	30.7
Prior Service Cost/(Credit)	0.3	0.4
Total Net Periodic Benefit Plan Income	(28.4)	(44.3)
PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.8	2.8
Interest Cost	8.5	5
Expected Return on Plan Assets	(19.1)	(22.4)
Actuarial Losses, net	0	0
Prior Service Cost/(Credit)	(5.4)	(5.4)
Total Net Periodic Benefit Plan Income	(14.2)	(20)
CL&P | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	3	4.5
Interest Cost	12.6	7.8
Expected Return on Plan Assets	(23.4)	(26.6)
Actuarial Losses, net	0.8	4.2
Prior Service Cost/(Credit)	0	0
Total Net Periodic Benefit Plan Income	(7)	(10.1)
Intercompany Income Allocations	(2)	(3.8)
CL&P | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.5
Interest Cost	1.6	0.9
Expected Return on Plan Assets	(2.4)	(2.8)
Actuarial Losses, net	0	0
Prior Service Cost/(Credit)	0.3	0.2
Total Net Periodic Benefit Plan Income	(0.2)	(1.2)
Intercompany Income Allocations	(0.5)	(0.9)
NSTAR Electric | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	2.1	3.6
Interest Cost	13.5	8.1
Expected Return on Plan Assets	(28.4)	(32)
Actuarial Losses, net	4.9	8.5
Prior Service Cost/(Credit)	0.1	0.1
Total Net Periodic Benefit Plan Income	(7.8)	(11.7)
Intercompany Income Allocations	(1.7)	(2.9)
NSTAR Electric | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.3	0.5
Interest Cost	2.3	1.3
Expected Return on Plan Assets	(9.2)	(10.6)
Actuarial Losses, net	0	0
Prior Service Cost/(Credit)	(4.2)	(4.3)
Total Net Periodic Benefit Plan Income	(10.8)	(13.1)
Intercompany Income Allocations	(0.6)	(0.9)
PSNH | Pension and SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	1.1	1.8
Interest Cost	6.8	4.2
Expected Return on Plan Assets	(12.3)	(14.1)
Actuarial Losses, net	0.4	2.2
Prior Service Cost/(Credit)	0	0
Total Net Periodic Benefit Plan Income	(4)	(5.9)
Intercompany Income Allocations	(0.5)	(0.8)
PSNH | PBOP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.2	0.2
Interest Cost	0.9	0.5
Expected Return on Plan Assets	(1.4)	(1.6)
Actuarial Losses, net	0	0
Prior Service Cost/(Credit)	0.1	0.1
Total Net Periodic Benefit Plan Income	(0.2)	(0.8)
Intercompany Income Allocations	$ (0.2)	$ (0.3)

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Environmental Sites and Related Reserves (Details) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2023 USD ($) site	Sep. 30, 2022 site	Dec. 31, 2022 USD ($)
Site Contingency [Line Items]
Number of Sites | site	59	59
Reserve | $	$ 121.2		$ 122.6
CL&P
Site Contingency [Line Items]
Number of Sites | site	13	13
Reserve | $	$ 13.6		13.9
NSTAR Electric
Site Contingency [Line Items]
Number of Sites | site	10	10
Reserve | $	$ 3.4		3.4
PSNH
Site Contingency [Line Items]
Number of Sites | site	8	8
Reserve | $	$ 6.1		$ 6.1

COMMITMENTS AND CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Environmental Matters Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Site Contingency [Line Items]
Reserve balance	$ 121.2	$ 122.6
MGP Sites
Site Contingency [Line Items]
Reserve balance	$ 111.7	$ 112.6

COMMITMENTS AND CONTINGENCIES_3

COMMITMENTS AND CONTINGENCIES - Guarantees and Obligations Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Fair value of guarantees		$ 5.4	$ 4.2
Forecast | Sunrise Wind LLC | Subsequent Event
Guarantor Obligations [Line Items]
Additional guaranty	$ 86.1

COMMITMENTS AND CONTINGENCIES_4

COMMITMENTS AND CONTINGENCIES - Guarantees and Indemnifications (Details) $ in Millions	Mar. 31, 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]
Maximum borrowing capacity			$ 25
North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest (percent)	50%
Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 838.4
Ownership interest (percent)	50%
Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 547.1
Ownership interest (percent)	50%
South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 7.1
Ownership interest (percent)	50%
South Fork Wind, LLC | Letters of Credit
Guarantor Obligations [Line Items]
Amount outstanding under line of credit		$ 4.3
Eversource Investment LLC | North East Offshore LLC
Guarantor Obligations [Line Items]
Ownership interest (percent)	50%
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 207.7
Ownership interest (percent)	50%
Construction-related purchase agreements with third-party contractors | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 726.2
Construction-related purchase agreements with third-party contractors | Sunrise Wind LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	668.6
Construction-related purchase agreements with third-party contractors | Revolution Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	409.7
Construction-related purchase agreements with third-party contractors | South Fork Wind, LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	126.2
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	68.9
Funding and indemnification obligations of North East Offshore LLC | Eversource Investment LLC | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	910
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)	4.3
Surety bonds | Various
Guarantor Obligations [Line Items]
Maximum exposure (up to)	37.2
Lease payments for real estate | Eversource Service
Guarantor Obligations [Line Items]
Maximum exposure (up to)	0.4
Performance guarantee | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 1,300
Percent of obligations guaranteed	50%
Payment guarantee | North East Offshore LLC
Guarantor Obligations [Line Items]
Maximum exposure (up to)	$ 62.5
Percent of obligations guaranteed	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			3 Months Ended	36 Months Ended
	Apr. 29, 2016 complaint	Oct. 16, 2014	Mar. 31, 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			10.41%
Percentage of incentive cap on total ROE			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	Mar. 31, 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	388,887	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	22,178,000	21,044,100
Rate Reduction Bonds	432,100	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	137,100	136,700
Long-Term Debt	20,650,500	18,891,300
Rate Reduction Bonds	417,300	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	4,310,200	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	100,800	99,200
Long-Term Debt	4,096,900	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	4,426,000	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	36,300	37,500
Long-Term Debt	4,217,400	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	388,887	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	1,459,400	1,164,600
Rate Reduction Bonds	432,100	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	1,331,700	970,500
Rate Reduction Bonds	$ 417,300	$ 424,700

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent [Roll Forward]
OCI Before Reclassifications	$ 0	$ (800)
Amounts Reclassified from AOCI	3,200	1,500
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(39,400)	(42,300)
Other Comprehensive Income (Loss), Net of Tax	3,230	704
Ending balance	(36,200)	(41,600)
Qualified Cash Flow Hedging Instruments
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(400)	(400)
OCI Before Reclassifications	0	0
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0
Ending balance	(400)	(400)
Unrealized Gains/(Losses) on Marketable Securities
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(1,200)	400
OCI Before Reclassifications	0	(800)
Amounts Reclassified from AOCI	1,200	0
Other Comprehensive Income (Loss), Net of Tax	1,200	(800)
Ending balance	0	(400)
Defined Benefit Plans
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(37,800)	(42,300)
OCI Before Reclassifications	0	0
Amounts Reclassified from AOCI	2,000	1,500
Other Comprehensive Income (Loss), Net of Tax	2,000	1,500
Ending balance	$ (35,800)	$ (40,800)

COMMON SHARES - Common Shares A

COMMON SHARES - Common Shares Authorized and Issued (Details) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Par value (in dollars per share)	$ 5	$ 5
Authorized (in shares)	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	May 03, 2023	May 02, 2023	Mar. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Treasury stock (in shares)			11,175,991	11,540,218
Common stock outstanding (in shares)			348,808,082	348,443,855
Authorized (in shares)			380,000,000	380,000,000
Subsequent Event
Class of Stock [Line Items]
Authorized (in shares)	410,000,000	380,000,000

COMMON SHAREHOLDERS' EQUITY A_2

COMMON SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Equity [Abstract]
Dividends on preferred stock	$ 1,880	$ 1,880
Noncontrolling interest attributed to preferred stock of subsidiaries	$ 155,570		$ 155,570

EARNINGS PER SHARE - Narrative

EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Antidilutive share awards excluded from the EPS computation (in shares)	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
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net Income Attributable to Common Shareholders	$ 491,159	$ 443,446
Net Income Attributable to Common Shareholders	$ 491,200	$ 443,400
Weighted Average Common Shares Outstanding:
Basic (in shares)	349,217,147	345,156,346
Dilutive effect (in shares)	394,866	504,787
Diluted (in shares)	349,612,013	345,661,133
Basic EPS (in dollars per share)	$ 1.41	$ 1.28
Diluted EPS (in dollars per share)	$ 1.41	$ 1.28

REVENUES (Details)

REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021	Sep. 01, 2021
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 3,751,800	$ 3,452,000
Alternative Revenue Programs	36,900	15,800
Other Revenues	6,900	3,500
Operating Revenues	3,795,643	3,471,310
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	1,338,905	1,285,831
Customer Credits at CL&P related to PURA Settlement Agreement and Storm Performance Penalty	0	(58,412)
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 at CL&P related to PURA Settlement Agreement and Storm Performance Penalty			$ 65,000
NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	956,283	863,176
PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	420,155	339,427
Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	3,347,100	2,857,900
Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,069,500	1,771,200
Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,122,900	932,400
Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	154,700	154,300
Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	109,700	105,900
Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	267,200	399,800
Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	27,800	30,400
Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		58,000
Operating Segments | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,451,800	1,430,100
Alternative Revenue Programs	24,600	1,300
Other Revenues	2,200	100
Operating Segments | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,104,400	1,004,700
Alternative Revenue Programs	(9,500)	(8,200)
Other Revenues	2,500	2,000
Operating Segments | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	461,100	395,100
Alternative Revenue Programs	9,600	(3,300)
Other Revenues	1,000	900
Operating Segments | Total Retail Tariff Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,091,400	874,800
Operating Segments | Total Retail Tariff Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	884,700	770,000
Operating Segments | Total Retail Tariff Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	365,200	292,900
Operating Segments | Residential | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	762,200	599,100
Operating Segments | Residential | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	467,800	404,600
Operating Segments | Residential | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	234,000	182,500
Operating Segments | Commercial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	295,300	242,200
Operating Segments | Commercial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	384,300	331,300
Operating Segments | Commercial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	108,600	88,400
Operating Segments | Industrial | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	33,900	33,500
Operating Segments | Industrial | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	32,600	34,100
Operating Segments | Industrial | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	22,600	22,000
Operating Segments | Wholesale Transmission Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	195,800	209,100
Operating Segments | Wholesale Transmission Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	167,800	165,200
Operating Segments | Wholesale Transmission Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	71,400	71,900
Operating Segments | Wholesale Market Sales Revenues | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	154,600	279,900
Operating Segments | Wholesale Market Sales Revenues | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,100	57,900
Operating Segments | Wholesale Market Sales Revenues | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	21,600	27,700
Operating Segments | Other Revenues from Contracts with Customers | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	9,300	7,900
Operating Segments | Other Revenues from Contracts with Customers | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	10,800	11,600
Operating Segments | Other Revenues from Contracts with Customers | PSNH
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,900	2,600
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | CL&P
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	700	58,400
Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund | NSTAR Electric
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	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
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	413,800	383,500
Alternative Revenue Programs	0	0
Other Revenues	0	0
Operating Revenues	413,800	383,500
Other | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	24,400
Other | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Other | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	413,800	359,100
Other | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0
Eliminations
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(744,000)	(723,400)
Alternative Revenue Programs	(16,900)	13,600
Other Revenues	0	0
Operating Revenues	(760,900)	(709,800)
Eliminations | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(6,100)	(5,600)
Eliminations | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Eliminations | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(1,000)	(1,100)
Eliminations | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(5,100)	(4,500)
Eliminations | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(325,300)	(364,700)
Eliminations | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Eliminations | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	(412,600)	(353,100)
Eliminations | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0
Consolidations Eliminations | CL&P
Disaggregation of Revenue [Line Items]
Operating Revenues	(139,700)	(145,700)
Consolidations Eliminations | NSTAR Electric
Disaggregation of Revenue [Line Items]
Operating Revenues	(141,100)	(135,300)
Consolidations Eliminations | PSNH
Disaggregation of Revenue [Line Items]
Operating Revenues	(51,500)	(53,300)
Electric Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,577,100	2,378,700
Alternative Revenue Programs	6,000	4,800
Other Revenues	5,500	2,800
Operating Revenues	2,588,600	2,386,300
Electric Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	2,341,500	1,937,100
Electric Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,464,000	1,186,200
Electric Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	788,400	661,300
Electric Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	89,100	89,600
Electric Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	217,300	365,500
Electric Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	18,300	17,700
Electric Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		58,400
Natural Gas Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,016,800	917,000
Alternative Revenue Programs	27,400	10,200
Other Revenues	1,000	400
Operating Revenues	1,045,200	927,600
Natural Gas Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	966,200	882,500
Natural Gas Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	576,600	556,800
Natural Gas Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	320,000	257,600
Natural Gas Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	69,600	68,100
Natural Gas Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Natural Gas Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	49,100	33,500
Natural Gas Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,500	1,000
Natural Gas Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0
Electric Transmission | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	439,700	450,000
Alternative Revenue Programs	18,700	(15,000)
Other Revenues	200	200
Operating Revenues	458,600	435,200
Electric Transmission | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	435,000	446,200
Electric Transmission | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Electric Transmission | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	4,700	3,800
Electric Transmission | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		0
Water Distribution | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	48,400	46,200
Alternative Revenue Programs	1,700	2,200
Other Revenues	200	100
Operating Revenues	50,300	48,500
Water Distribution | Operating Segments | Total Retail Tariff Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	45,500	43,900
Water Distribution | Operating Segments | Residential
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	28,900	28,200
Water Distribution | Operating Segments | Commercial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	15,500	14,600
Water Distribution | Operating Segments | Industrial
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,100	1,100
Water Distribution | Operating Segments | Wholesale Transmission Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Water Distribution | Operating Segments | Wholesale Market Sales Revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	800	800
Water Distribution | Operating Segments | Other Revenues from Contracts with Customers
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 2,100	1,900
Water Distribution | Operating Segments | Amortization of/(Reserve for) Revenues Subject to Refund
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ (400)

SEGMENT INFORMATION - Narrative

SEGMENT INFORMATION - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 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
Affiliated Entity
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
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues	$ 3,795,643	$ 3,471,310
Depreciation and Amortization	(236,900)	(526,300)
Other Operating Expenses	(2,809,100)	(2,281,900)
Operating Income/(Loss)	749,573	663,055
Interest Expense	(194,543)	(153,245)
Other Income, Net	88,981	71,561
Net Income/(Loss) Attributable to Common Shareholders	491,159	443,446
Cash Flows Used for Investments in Plant	977,144	764,594
Assets	54,105,167		$ 53,230,900
Other
Segment Reporting Information [Line Items]
Operating Revenues	413,800	383,500
Depreciation and Amortization	(36,800)	(30,200)
Other Operating Expenses	(339,600)	(331,400)
Operating Income/(Loss)	37,400	21,900
Interest Expense	(85,100)	(46,800)
Other Income, Net	565,800	495,900
Net Income/(Loss) Attributable to Common Shareholders	516,900	468,700
Cash Flows Used for Investments in Plant	65,200	62,100
Assets	27,186,400		26,365,200
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(760,900)	(709,800)
Depreciation and Amortization	2,100	1,600
Other Operating Expenses	759,300	708,800
Operating Income/(Loss)	500	600
Interest Expense	32,000	10,100
Other Income, Net	(550,600)	(493,100)
Net Income/(Loss) Attributable to Common Shareholders	(518,100)	(482,400)
Cash Flows Used for Investments in Plant	0	0
Assets	(25,514,600)		(24,737,500)
Electric Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	2,588,600	2,386,300
Depreciation and Amortization	(22,000)	(351,600)
Other Operating Expenses	(2,342,300)	(1,845,600)
Operating Income/(Loss)	224,300	189,100
Interest Expense	(69,300)	(59,400)
Other Income, Net	54,300	47,600
Net Income/(Loss) Attributable to Common Shareholders	165,500	140,900
Cash Flows Used for Investments in Plant	371,900	280,500
Assets	27,978,800		27,365,000
Natural Gas Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	1,045,200	927,600
Depreciation and Amortization	(77,000)	(51,900)
Other Operating Expenses	(730,400)	(657,300)
Operating Income/(Loss)	237,800	218,400
Interest Expense	(21,200)	(15,800)
Other Income, Net	9,000	10,100
Net Income/(Loss) Attributable to Common Shareholders	170,300	164,000
Cash Flows Used for Investments in Plant	165,500	127,300
Assets	8,127,800		8,084,900
Electric Transmission | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	458,600	435,200
Depreciation and Amortization	(89,900)	(81,900)
Other Operating Expenses	(128,200)	(129,300)
Operating Income/(Loss)	240,500	224,000
Interest Expense	(41,500)	(33,200)
Other Income, Net	9,400	8,900
Net Income/(Loss) Attributable to Common Shareholders	155,100	148,500
Cash Flows Used for Investments in Plant	336,600	266,900
Assets	13,522,600		13,369,500
Water Distribution | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues	50,300	48,500
Depreciation and Amortization	(13,300)	(12,300)
Other Operating Expenses	(27,900)	(27,100)
Operating Income/(Loss)	9,100	9,100
Interest Expense	(9,400)	(8,200)
Other Income, Net	1,100	2,200
Net Income/(Loss) Attributable to Common Shareholders	1,500	3,700
Cash Flows Used for Investments in Plant	37,900	$ 27,800
Assets	$ 2,804,200		$ 2,783,800