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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Allowance for Uncollectible Accounts The activity in the allowance for uncollectible accounts by portfolio segment is as follows:
EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Hardship AccountsRetail (Non-Hardship),
Wholesale, and Other Receivables		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale and Other Receivables		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other Receivables		Total AllowanceTotal Allowance
Three Months Ended 2021
Beginning Balance$194.8 $164.1 $358.9 $129.1 $28.3 $157.4 $39.7 $51.9 $91.6 $17.2 
Uncollectible Expense— 16.3 16.3 — 3.8 3.8 — 3.9 3.9 1.2 
Uncollectible Costs
   Deferred (1)
5.4 27.1 32.5 11.9 7.5 19.4 (8.5)8.4 (0.1)1.2 
Write-Offs(3.3)(16.7)(20.0)(2.9)(4.0)(6.9)(0.1)(7.5)(7.6)(2.5)
Recoveries Collected0.4 3.6 4.0 0.3 1.1 1.4 — 1.5 1.5 0.2 
Ending Balance$197.3 $194.4 $391.7 $138.4 $36.7 $175.1 $31.1 $58.2 $89.3 $17.3 
Three Months Ended 2020
Beginning Balance$143.3 $81.5 $224.8 $80.1 $17.2 $97.3 $43.9 $31.5 $75.4 $10.5 
ASU 2016-13
   Implementation Impact
   on January 1, 2020		21.6 2.2 23.8 21.3 0.9 22.2 (1.6)0.3 (1.3)0.3 
Uncollectible Expense— 11.4 11.4 — 3.2 3.2 — 3.7 3.7 0.7 
Uncollectible Costs
   Deferred (1)
11.8 8.5 20.3 12.9 1.8 14.7 (3.4)3.4 — 1.3 
Write-Offs(4.7)(16.8)(21.5)(3.8)(3.5)(7.3)(0.4)(8.0)(8.4)(1.7)
Recoveries Collected0.2 3.1 3.3 0.2 0.6 0.8 — 1.7 1.7 0.1 
Ending Balance$172.2 $89.9 $262.1 $110.7 $20.2 $130.9 $38.5 $32.6 $71.1 $11.2 

(1) The current period provision for expected credit losses is deferred as a regulatory cost on the balance sheets, as this amount is ultimately
recovered in rates. Amounts include uncollectible costs for hardship accounts and other customer receivables, including uncollectible
amounts related to COVID-19.
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, 2021March 31, 2020
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Pension, SERP and PBOP Non-Service
   Income Components		$20.1 $2.7 $10.1 $2.7 $12.7 $1.1 $7.9 $1.9 
AFUDC Equity9.2 1.7 6.2 0.6 10.6 3.9 5.0 1.5 
Equity in Earnings of Unconsolidated Affiliates3.7 — 0.1 — 4.0 — 0.1 — 
Investment (Loss)/Income(0.6)0.4 0.2 0.1 (4.3)(3.4)(1.3)(0.5)
Interest Income1.5 0.1 0.1 0.7 0.7 0.3 0.1 0.3 
Other0.3 — 0.1 0.1 0.4 — 0.4 — 
Total Other Income, Net$34.2 $4.9 $16.8 $4.2 $24.1 $1.9 $12.2 $3.2 
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, 2021March 31, 2020
Eversource$48.6 $43.1 
CL&P39.2 35.5 
Non-cash Investing Activities
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)As of March 31, 2021As of March 31, 2020
Eversource$262.9 $273.7 
CL&P70.9 85.0 
NSTAR Electric68.2 70.2 
PSNH23.5 37.9 
Reconciliation of Cash Balances to Cash and Restricted Cash The following table reconciles cash as reported on the balance sheets to the cash and restricted cash balance as reported on the statements of cash flows:
 As of March 31, 2021As of December 31, 2020
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Cash as reported on the Balance Sheets$34.1 $9.3 $0.1 $2.0 $106.6 $90.8 $0.1 $0.1 
Restricted cash included in:
Special Deposits58.4 8.6 17.2 22.2 73.6 8.7 17.2 36.8 
Marketable Securities38.4 0.4 0.1 0.6 41.2 0.3 0.1 0.6 
Other Long-Term Assets44.7 — — 3.2 43.6 — — 2.1 
Cash and Restricted Cash as reported on the
    Statements of Cash Flows
$175.6 $18.3 $17.4 $28.0 $265.0 $99.8 $17.4 $39.6