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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
SCHEDULE II
EVERSOURCE ENERGY AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
FOR THE YEARS ENDED DECEMBER 31, 2023, 2022 AND 2021
(Thousands of Dollars)
Column AColumn BColumn CColumn DColumn E
  Additions  
  (1)(2)  
Description:Balance as of Beginning of YearCharged to Costs and ExpensesCharged to Other
Accounts -
Describe (a)		 Deductions -Describe (b)Balance as of End of Year
Eversource:
     
Reserves Deducted from Assets -     
Reserves for Uncollectible Accounts:     
 2023$486,297 $72,468 $158,205 $162,515 $554,455 
 2022417,406 61,876 112,533 105,518 486,297 
 2021358,851 60,886 110,572 112,903 417,406 
CL&P:     
Reserves Deducted from Assets -     
Reserves for Uncollectible Accounts:     
 2023$225,320 $11,675 $126,360 $67,325 $296,030 
 2022181,319 15,578 59,485 31,062 225,320 
 2021157,447 13,495 57,779 47,402 181,319 
NSTAR Electric:     
Reserves Deducted from Assets -     
Reserves for Uncollectible Accounts:     
 2023$94,958 $22,791 $17,488 $38,211 $97,026 
 202297,005 21,550 12,412 36,009 94,958 
 202191,583 16,649 20,064 31,291 97,005 
PSNH:
     
Reserves Deducted from Assets -     
Reserves for Uncollectible Accounts:     
 2023$29,236 $3,989 $(8,735)$10,168 $14,322 
 202224,331 9,211 2,539 6,845 29,236 
 202117,157 13,113 3,135 9,074 24,331 

(a)    Amounts relate to uncollectible accounts receivables reserved for that are not charged to bad debt expense. CL&P, NSTAR Electric, NSTAR Gas, EGMA and Yankee Gas are allowed to recover in rates, amounts associated with certain uncollectible hardship accounts receivable. CL&P, NSTAR Electric, PSNH, NSTAR Gas and EGMA are also allowed to recover uncollectible energy supply costs through regulatory tracking mechanisms.
(b)    Amounts written off, net of recoveries.