XML 176 R148.htm IDEA: XBRL DOCUMENT
v3.25.0.1

COMMITMENTS AND CONTINGENCIES - Schedule of Total Costs Incurred (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | $ 591.4 | $ 581.4 | $ 678.1
Natural Gas Procurement | 695.0 | 695.8 | 1,042.8
Capacity and Purchased Power | 70.5 | 69.0 | 61.6
Peaker CfDs | 23.1 | 20.1 | 13.4
Transmission Support Commitments | 16.7 | 14.2 | 12.7
CL&P |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 529.0 | 474.1 | 513.2
Capacity and Purchased Power | 67.6 | 65.5 | 57.7
Peaker CfDs | 23.1 | 20.1 | 13.4
Transmission Support Commitments | 6.6 | 5.6 | 5.0
NSTAR Electric |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 62.4 | 60.0 | 90.8
Capacity and Purchased Power | 2.9 | 2.9 | 3.0
Peaker CfDs | 0.0 | 0.0 | 0.0
Transmission Support Commitments | 6.6 | 5.6 | 5.0
PSNH |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Renewable Energy Purchase Contracts | 0.0 | 47.3 | 74.1
Capacity and Purchased Power | 0.0 | 0.6 | 0.9
Peaker CfDs | 0.0 | 0.0 | 0.0
Transmission Support Commitments | $ 3.5 | $ 3.0 | $ 2.7

X
- References No definition available. + Details
Name: | es_NaturalGasProcurementCostsIncurred
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | es_PeakerCfdExpenseIncurred
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | es_RenewableEnergyCostsIncurred
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | es_SupplyAndStrandedCostsObligationsIncurred
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | es_TransmissionSupportCommitmentCostsIncurred
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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: |