XML 168 R140.htm IDEA: XBRL DOCUMENT
v3.25.0.1

INCOME TAXES - Tax Credits and Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | $ 214.1 | $ 243.4
Tax Credit | 238.3 | 228.5
State Charitable Contribution | 15.2 | 7.9
State and Local Jurisdiction | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 2,700.0 | 0.0
Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 877.7 | 0.0
Tax Credit | 404.1 | 0.0
Internal Revenue Service (IRS) | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 2,700.0 | 0.0
CL&P | State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 0.0 | 0.0
Tax Credit | 157.7 | 157.5
State Charitable Contribution | 0.0 | 0.0
CL&P | State and Local Jurisdiction | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 0.0 | 0.0
CL&P | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 0.0 | 0.0
Tax Credit | 0.0 | 0.0
CL&P | Internal Revenue Service (IRS) | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 0.0 | 0.0
NSTAR Electric | State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 0.0 | 0.0
Tax Credit | 0.0 | 0.0
State Charitable Contribution | 0.0 | 0.0
NSTAR Electric | State and Local Jurisdiction | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 0.0 | 0.0
NSTAR Electric | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 0.0 | 0.0
Tax Credit | 0.0 | 0.0
NSTAR Electric | Internal Revenue Service (IRS) | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 0.0 | 0.0
PSNH | State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 0.0 | 0.0
Tax Credit | 0.0 | 0.0
State Charitable Contribution | 0.0 | 0.0
PSNH | State and Local Jurisdiction | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | 0.0 | 0.0
PSNH | Internal Revenue Service (IRS) |  |
Operating Loss Carryforwards [Line Items] |  |
Net Operating Loss | 7.1 | 0.0
Tax Credit | 0.0 | 0.0
PSNH | Internal Revenue Service (IRS) | Capital Loss Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit | $ 0.0 | $ 0.0

X
- Definition Amount of future tax deductions arising from contributions in excess of statutory limitations in historical filings, and which can only be realized if sufficient tax-basis income is generated in future periods to enable deductions to be taken and providing tax laws continue to allow such deductions. + References No definition available. + Details
Name: | es_CharitableContribution
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_CapitalLossCarryforwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
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: |