XML 78 R59.htm IDEA: XBRL DOCUMENT
v3.22.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands, customer in Millions | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) utility customer | May 04, 2022 | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated affiliates | $ 1,719,878 |  |  | $ 1,436,293 |  |  |
Number of electric, natural gas and water customers | customer | 4.4 |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 457,800 |  | $ 432,200 | 417,400 | $ 425,800 | $ 391,700 | $ 358,900
Cash, cash equivalents, restricted cash and restricted cash equivalents | 156,676 |  |  | 221,008 | 368,011 |  | 264,950
Energy Relief Fund - Merrimack Valley Programs |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash, current | 20,000 |  |  |  |  |  |
Energy Relief Fund - Merrimack Valley Programs | Other Long-Term Assets |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash, noncurrent | 15,900 |  |  |  |  |  |
Restricted cash |  |  |  | 41,500 |  |  |
COVID-19 |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 63,100 |  |  | 55,300 |  |  |
CL&P |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | $ 192,700 |  | 180,500 | 181,300 | 188,800 | 175,100 | 157,400
Period of accounts receivable recoverable under financial or medical duress | 180 days |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | $ 17,911 |  |  | 74,788 | 207,441 |  | 99,809
CL&P | Customer Assistance Fund |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 10,000 |  |  | 10,000 |  |  |
CL&P | COVID-19 |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 20,400 |  |  | 23,900 |  |  |
NSTAR Electric |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 100,500 |  | 94,800 | 97,000 | 98,000 | 89,300 | 91,600
Cash, cash equivalents, restricted cash and restricted cash equivalents | 22,724 |  |  | 18,179 | 17,898 |  | 17,410
NSTAR Electric | COVID-19 |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 7,500 |  |  | 9,000 |  |  |
PSNH |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for uncollectible accounts for late fees and other receivable amounts | 27,300 |  | $ 26,200 | 24,300 | 17,200 | $ 17,300 | 17,200
Cash, cash equivalents, restricted cash and restricted cash equivalents | 34,299 |  |  | 35,126 | $ 39,226 |  | $ 39,555
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 | utility | 10 |  |  |  |  |  |
Offshore Wind Business |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership interest |  | 50.00% |  |  |  |  |
North East Offshore LLC |  |  |  |  |  |  |
Summary of Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership interest | 50.00% |  |  |  |  |  |

X
- Definition Number of Electric, Natural Gas And Water Customers + References No definition available. + Details
Name: | es_NumberofElectricNaturalGasAndWaterCustomers
Namespace Prefix: | es_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Regulated Utilities + References No definition available. + Details
Name: | es_NumberofRegulatedUtilities
Namespace Prefix: | es_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Accounts Receivable Recoverable Under Financial or Medical Duress + References No definition available. + Details
Name: | es_PeriodofAccountsReceivableRecoverableUnderFinancialorMedicalDuress
Namespace Prefix: | es_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Summary of Accounting Policies [Table] + References No definition available. + Details
Name: | es_SummaryofAccountingPoliciesLineItems
Namespace Prefix: | es_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 + Details
Name: | us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
Name: | us-gaap_RestrictedCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL116631458-115580 + Details
Name: | us-gaap_RestrictedCashNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=es_EnergyReliefFundMerrimackValleyProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=es_COVID19Member
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: | us-gaap_CashAndCashEquivalentsAxis=es_CustomerAssistanceFundMember
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: |

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

X
- Details
Name: | srt_StatementGeographicalAxis=es_ConnecticutMassachusettsandNewHampshireMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=es_OffshoreWindBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=es_NortheastOffshoreLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |