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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]  
Allowance for Uncollectible Accounts The activity in the allowance for uncollectible accounts by portfolio segment as of June 30th is as follows:
EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Hardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceTotal Allowance
Three Months Ended 2022
Beginning Balance$225.5 $206.7 $432.2 $140.1 $40.4 $180.5 $39.7 $55.1 $94.8 $26.2 
Uncollectible Expense— 12.9 12.9 — 2.9 2.9 — 4.0 4.0 2.0 
Uncollectible Costs Deferred (1)
21.4 12.6 34.0 15.0 2.2 17.2 5.4 2.4 7.8 0.1 
Write-Offs(4.6)(21.1)(25.7)(3.3)(6.2)(9.5)(0.1)(7.7)(7.8)(1.3)
Recoveries Collected0.4 4.0 4.4 0.3 1.3 1.6 — 1.7 1.7 0.3 
Ending Balance$242.7 $215.1 $457.8 $152.1 $40.6 $192.7 $45.0 $55.5 $100.5 $27.3 
Six 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— 30.0 30.0 — 6.7 6.7 — 8.7 8.7 4.5 
Uncollectible Costs Deferred (1)
22.4 27.3 49.7 11.0 — 11.0 2.1 7.8 9.9 1.1 
Write-Offs(6.9)(43.1)(50.0)(4.4)(6.7)(11.1)(0.4)(18.3)(18.7)(3.1)
Recoveries Collected1.1 9.6 10.7 0.9 3.9 4.8 — 3.6 3.6 0.5 
Ending Balance$242.7 $215.1 $457.8 $152.1 $40.6 $192.7 $45.0 $55.5 $100.5 $27.3 
EversourceCL&PNSTAR ElectricPSNH
(Millions of Dollars)Hardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceHardship AccountsRetail (Non-Hardship),
Wholesale, and Other		Total AllowanceTotal Allowance
Three Months Ended 2021
Beginning Balance$197.3 $194.4 $391.7 $138.4 $36.7 $175.1 $31.1 $58.2 $89.3 $17.3 
Uncollectible Expense— 11.4 11.4 — 2.8 2.8 — 3.5 3.5 2.0 
Uncollectible Costs Deferred (1)
16.6 24.5 41.1 9.3 8.3 17.6 4.9 6.9 11.8 (0.3)
Write-Offs(3.4)(18.1)(21.5)(2.3)(5.4)(7.7)(0.1)(7.7)(7.8)(2.0)
Recoveries Collected0.2 2.9 3.1 0.2 0.8 1.0 — 1.2 1.2 0.2 
Ending Balance$210.7 $215.1 $425.8 $145.6 $43.2 $188.8 $35.9 $62.1 $98.0 $17.2 
Six 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— 27.7 27.7 — 6.6 6.6 — 7.4 7.4 3.2 
Uncollectible Costs Deferred (1)
22.0 51.6 73.6 21.2 15.7 36.9 (3.5)15.2 11.7 0.8 
Write-Offs(6.7)(34.8)(41.5)(5.2)(9.3)(14.5)(0.3)(15.2)(15.5)(4.5)
Recoveries Collected0.6 6.5 7.1 0.5 1.9 2.4 — 2.8 2.8 0.5 
Ending Balance$210.7 $215.1 $425.8 $145.6 $43.2 $188.8 $35.9 $62.1 $98.0 $17.2 

(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.
Components of Other Income, Net
The components of Other Income, Net on the statements of income were as follows:
 For the Three Months Ended
 June 30, 2022June 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Pension, SERP and PBOP Non-Service
   Income Components, Net of Deferred Portion		$54.9 $16.2 $21.4 $6.7 $22.1 $4.3 $10.2 $2.7 
AFUDC Equity11.2 2.8 6.1 0.6 9.2 1.7 6.2 0.3 
Equity in Earnings of Unconsolidated Affiliates (1)
16.6 — 0.1 — 4.7 — 0.1 — 
Investment Income/(Loss)1.3 (0.7)0.5 0.1 1.9 1.2 0.6 0.3 
Interest Income9.5 1.5 6.1 0.4 8.4 2.7 4.8 0.9 
Other0.4 — 0.1 — 0.3 — — 0.1 
Total Other Income, Net$93.9 $19.8 $34.3 $7.8 $46.6 $9.9 $21.9 $4.3 
 For the Six Months Ended
 June 30, 2022June 30, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Pension, SERP and PBOP Non-Service
   Income Components, Net of Deferred Portion		$109.2 $32.1 $42.4 $13.3 $42.2 $7.0 $20.2 $5.4 
AFUDC Equity21.1 5.6 11.0 1.0 18.4 3.4 12.4 0.9 
Equity in Earnings of Unconsolidated Affiliates (1)
17.1 — 0.1 — 8.4 — 0.2 — 
Investment Income/(Loss)1.1 (1.1)0.2 0.3 1.3 1.5 0.8 0.4 
Interest Income16.1 2.8 9.6 0.7 9.9 2.8 4.9 1.6 
Other0.8 — 0.2 — 0.6 0.1 0.2 0.1 
Total Other Income, Net$165.4 $39.4 $63.5 $15.3 $80.8 $14.8 $38.7 $8.4 

(1)    Equity in earnings of unconsolidated affiliates includes $12.2 million of pre-tax unrealized gains associated with an investment in a renewable energy fund for the three and six months ended June 30, 2022. For the three and six months ended June 30, 2021, equity in earnings of unconsolidated affiliates included $2.1 million of pre-tax unrealized gains associated with this investment.
Investments in Unconsolidated Affiliates Eversource's investments included the following:
(Millions of Dollars)Ownership InterestAs of June 30, 2022As of December 31, 2021
Offshore Wind Business - North East Offshore50 %$1,487.1 $1,213.6 
Natural Gas Pipeline - Algonquin Gas Transmission, LLC15 %119.3 121.9 
Renewable Energy Investment Fund90 %88.4 76.5 
Other various25.1 24.3 
Total Investments in Unconsolidated Affiliates$1,719.9 $1,436.3 
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. Cash flows used in investing activities presented in Investments in Unconsolidated Affiliates, Net on the statements of cash flows relates to capital contributions in the offshore wind investment.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 has advanced its strategic review process and is working with its advisors on the outreach strategy and marketing materials, which will aid the Company in evaluating the alternatives available for its wind investment. In late July, Eversource started preliminary and targeted outreach to potential buyers. Eversource expects to complete this review during 2022. Eversource’s strategic review of its offshore wind investment does not impact the June 30, 2022 financial statements.
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 EndedFor the Six Months Ended
(Millions of Dollars)June 30, 2022June 30, 2021June 30, 2022June 30, 2021
Eversource$44.5 $39.9 $93.1 $88.5 
CL&P39.0 35.4 76.8 74.6
Non-cash Investing Activities
Non-cash investing activities include plant additions included in Accounts Payable as follows:
(Millions of Dollars)As of June 30, 2022As of June 30, 2021
Eversource$357.2 $344.8 
CL&P96.7 66.4 
NSTAR Electric75.1 103.8 
PSNH49.6 33.9 
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 June 30, 2022As of December 31, 2021
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNHEversourceCL&PNSTAR ElectricPSNH
Cash as reported on the Balance Sheets$29.5 $9.2 $5.3 $0.1 $66.8 $55.8 $0.7 $— 
Restricted cash included in:
Special Deposits90.8 8.7 17.4 30.9 78.2 18.7 17.4 31.4 
Marketable Securities17.2 — — 0.1 31.3 0.3 0.1 0.5 
Other Long-Term Assets19.2 — — 3.2 44.7 — — 3.2 
Cash and Restricted Cash as reported on the
    Statements of Cash Flows
$156.7 $17.9 $22.7 $34.3 $221.0 $74.8 $18.2 $35.1