XML 182 R147.htm IDEA: XBRL DOCUMENT
v3.22.0.1

COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) - USD ($) | Mar. 31, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Oct. 25, 2019
--- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |
Fair value of guarantees |  |  | $ 7,300,000 |
North East Offshore LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Ownership interest |  |  | 50.00% |
Sunrise Wind LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 420,600,000 | $ 15,400,000
Ownership interest |  |  | 50.00% | 50.00%
Revolution Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 158,900,000 |
Ownership interest |  |  | 50.00% |
Construction-related Purchase Contracts with Third-Party Suppliers | South Fork Wind, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Ownership interest |  |  | 50.00% |
North East Offshore LLC | Construction-related Purchase Contracts with Third-Party Suppliers |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 1,080,600,000 |
North East Offshore LLC | Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 1,300,000,000 |
Percent of obligations guaranteed |  |  | 50.00% |
North East Offshore LLC | Payment Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 62,500,000 |
Percent of obligations guaranteed |  |  | 50.00% |
Sunrise Wind LLC | Construction-related Purchase Contracts with Third-Party Suppliers |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 382,300,000 |
Sunrise Wind LLC | OREC Capacity Production |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 2,200,000 |
Revolution Wind, LLC | Construction-related Purchase Contracts with Third-Party Suppliers |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 150,900,000 |
South Fork Wind, LLC | Letter of Credit | Subsequent Event |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Borrowings outstanding | $ 43,400,000 | $ 4,300,000 |  |
South Fork Wind, LLC | Construction-related Purchase Contracts with Third-Party Suppliers |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 137,200,000 |
South Fork Wind, LLC | Transmission Interconnection |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 1,200,000 |
South Fork Wind, LLC | Purchase Guarantee Expiring 2026 |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 125,200,000 |
Eversource Investment LLC | North East Offshore LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Ownership interest |  |  | 50.00% |
Eversource Investment LLC | Funding and Indemnification Obligations |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 0 |
Eversource Investment LLC | Funding and Indemnification Obligations | North East Offshore LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 910,000,000 |
Bay State Wind LLC | Real Estate Purchase |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 2,500,000 |
Various | Surety Bonds |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 54,700,000 |
Eversource Service | Lease Payments for Real Estate |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | $ 800,000 |

X
- Definition Guarantor Obligations, Maximum Exposure, Percent Of Obligation + References No definition available. + Details
Name: | es_GuarantorObligationsMaximumExposurePercentOfObligation
Namespace Prefix: | es_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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 http://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 The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=es_PurchaseGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PerformanceGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PaymentGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=es_CapacityProductionGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=es_TransmissionInterconnectionGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=es_PurchaseGuaranteeExpiring2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=es_RealEstatePurchaseGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_PropertyLeaseGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |