XML 92 R70.htm IDEA: XBRL DOCUMENT
v3.24.3

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 20,766,100 | $ 19,656,500
Distribution - Natural Gas | 8,569,300 | 8,155,300
Transmission - Electric | 15,679,100 | 14,666,800
Distribution - Water | 2,319,200 | 2,280,100
Solar | 201,100 | 201,100
Utility | 47,534,800 | 44,959,800
Other | 2,233,900 | 2,006,800
Property, Plant and Equipment, Gross | 49,768,700 | 46,966,600
Less: Accumulated Depreciation |  |
Utility | (10,137,900) | (9,670,100)
Other | (1,003,500) | (869,600)
Total Accumulated Depreciation | (11,141,400) | (10,539,700)
Property, Plant and Equipment, Net | 38,627,300 | 36,426,900
Construction Work in Progress | 3,284,200 | 3,071,700
Total Property, Plant and Equipment, Net | 41,911,467 | 39,498,607
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,336,400 | 7,897,100
Transmission - Electric | 6,804,100 | 6,548,200
Solar | 0 | 0
Property, Plant and Equipment, Gross | 15,140,500 | 14,445,300
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,874,100) | (2,670,500)
Property, Plant and Equipment, Net | 12,266,400 | 11,774,800
Construction Work in Progress | 563,400 | 565,400
Total Property, Plant and Equipment, Net | 12,829,760 | 12,340,192
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 9,558,100 | 9,000,500
Transmission - Electric | 6,183,700 | 5,630,800
Solar | 201,100 | 201,100
Property, Plant and Equipment, Gross | 15,942,900 | 14,832,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,719,700) | (3,585,900)
Property, Plant and Equipment, Net | 12,223,200 | 11,246,500
Construction Work in Progress | 1,404,000 | 1,507,300
Total Property, Plant and Equipment, Net | 13,627,246 | 12,753,787
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,911,900 | 2,799,200
Transmission - Electric | 2,692,900 | 2,489,500
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,604,800 | 5,288,700
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (1,014,200) | (984,000)
Property, Plant and Equipment, Net | 4,590,600 | 4,304,700
Construction Work in Progress | 368,300 | 270,000
Total Property, Plant and Equipment, Net | $ 4,958,890 | $ 4,574,652

X
- Definition Period end book value of accumulated depreciation on distribution related property, plant and equipment (PPE) that is owned by the regulated operations of the public utility." + References No definition available. + Details
Name: | es_ElectricAndNaturalGasUtilityAccumulatedDepreciation
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period end book value of accumulated depreciation on other property, plant and equipment (PPE) owned by the regulated operations of the public utility. + References No definition available. + Details
Name: | es_OtherAccumulatedDepreciation
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
Name: | es_PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility natural gas distribution. + References No definition available. + Details
Name: | es_PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities Property Plant And Equipment Distribution, Water + References No definition available. + Details
Name: | es_PublicUtilitiesPropertyPlantAndEquipmentDistributionWater
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility + References No definition available. + Details
Name: | es_PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal
Namespace Prefix: | es_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DepreciationAndAmortizationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility distribution. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDistribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to generation or processing owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of total net PPE. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of total gross PPE. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to utility transmission owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmission
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 No definition available. + Details
Name: | us-gaap_PublicUtilityPropertyPlantAndEquipmentLineItems
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: |