XML 108 R80.htm IDEA: XBRL DOCUMENT
v3.24.0.1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | $ 486,300 | $ 417,400 | $ 358,900
Uncollectible Expense | 72,468 | 61,876 | 60,886
Uncollectible Costs Deferred | 158,200 | 112,500 | 110,600
Write-Offs | (178,100) | (124,000) | (129,700)
Recoveries Collected | 15,600 | 18,500 | 16,700
Ending Balance | 554,500 | 486,300 | 417,400
Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 284,400 | 226,100 | 194,800
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 137,000 | 77,800 | 51,900
Write-Offs | (55,900) | (21,300) | (22,000)
Recoveries Collected | 1,300 | 1,800 | 1,400
Ending Balance | 366,800 | 284,400 | 226,100
Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 201,900 | 191,300 | 164,100
Uncollectible Expense | 72,500 | 61,900 | 60,900
Uncollectible Costs Deferred | 21,200 | 34,700 | 58,700
Write-Offs | (122,200) | (102,700) | (107,700)
Recoveries Collected | 14,300 | 16,700 | 15,300
Ending Balance | 187,700 | 201,900 | 191,300
CL&P |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 225,300 | 181,300 | 157,400
Uncollectible Expense | 11,675 | 15,578 | 13,495
Uncollectible Costs Deferred | 126,400 | 59,500 | 57,800
Write-Offs | (73,200) | (38,300) | (54,200)
Recoveries Collected | 5,800 | 7,200 | 6,800
Ending Balance | 296,000 | 225,300 | 181,300
CL&P | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 188,900 | 144,600 | 129,100
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 114,400 | 58,300 | 32,300
Write-Offs | (44,700) | (15,300) | (18,000)
Recoveries Collected | 1,100 | 1,300 | 1,200
Ending Balance | 259,700 | 188,900 | 144,600
CL&P | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 36,400 | 36,700 | 28,300
Uncollectible Expense | 11,700 | 15,600 | 13,500
Uncollectible Costs Deferred | 12,000 | 1,200 | 25,500
Write-Offs | (28,500) | (23,000) | (36,200)
Recoveries Collected | 4,700 | 5,900 | 5,600
Ending Balance | 36,300 | 36,400 | 36,700
NSTAR Electric |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 95,000 | 97,000 | 91,600
Uncollectible Expense | 22,791 | 21,550 | 16,649
Uncollectible Costs Deferred | 17,500 | 12,400 | 20,100
Write-Offs | (43,300) | (42,300) | (37,000)
Recoveries Collected | 5,000 | 6,300 | 5,700
Ending Balance | 97,000 | 95,000 | 97,000
NSTAR Electric | Hardship Accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 43,700 | 43,300 | 39,700
Uncollectible Expense | 0 | 0 | 0
Uncollectible Costs Deferred | 1,500 | 1,500 | 4,300
Write-Offs | (1,600) | (1,100) | (700)
Recoveries Collected | 0 | 0 | 0
Ending Balance | 43,600 | 43,700 | 43,300
NSTAR Electric | Retail (Non-Hardship), Wholesale, and Other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 51,300 | 53,700 | 51,900
Uncollectible Expense | 22,800 | 21,600 | 16,600
Uncollectible Costs Deferred | 16,000 | 10,900 | 15,800
Write-Offs | (41,700) | (41,200) | (36,300)
Recoveries Collected | 5,000 | 6,300 | 5,700
Ending Balance | 53,400 | 51,300 | 53,700
PSNH |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 29,200 | 24,300 | 17,200
Uncollectible Expense | 3,989 | 9,211 | 13,113
Uncollectible Costs Deferred | (8,700) | 2,500 | 3,100
Write-Offs | (10,900) | (7,700) | (10,000)
Recoveries Collected | 700 | 900 | 900
Ending Balance | $ 14,300 | $ 29,200 | $ 24,300

X
- Definition Accounts Receivable, Allowance For Credit Loss , Deferred Expense (Reversal) + References No definition available. + Details
Name: | es_AccountsReceivableAllowanceForCreditLossDeferredExpenseReversal
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-4 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=es_HardshipAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=es_RetailNonHardshipWholesaleandOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_TheConnecticutLightAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_NstarElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=es_PublicServiceCompanyOfNewHampshirePSNHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |