XML 90 R71.htm IDEA: XBRL DOCUMENT
v3.23.3

PROPERTY, PLANT AND EQUIPMENT AND ACCUMULATED DEPRECIATION - Summary of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | $ 19,238,300 | $ 18,326,200
Distribution - Natural Gas | 7,754,400 | 7,443,800
Transmission - Electric | 14,233,100 | 13,709,300
Distribution - Water | 2,203,600 | 2,112,600
Solar | 200,800 | 200,800
Utility | 43,630,200 | 41,792,700
Other | 1,959,200 | 1,738,100
Property, Plant and Equipment, Gross | 45,589,400 | 43,530,800
Less: Accumulated Depreciation |  |
Utility | (9,518,600) | (9,167,400)
Other | (823,000) | (706,100)
Total Accumulated Depreciation | (10,341,600) | (9,873,500)
Property, Plant and Equipment, Net | 35,247,800 | 33,657,300
Construction Work in Progress | 3,270,500 | 2,455,500
Total Property, Plant and Equipment, Net | 38,518,294 | 36,112,820
CL&P |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 7,717,000 | 7,370,100
Transmission - Electric | 6,345,800 | 6,165,100
Solar | 0 | 0
Property, Plant and Equipment, Gross | 14,062,800 | 13,535,200
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (2,659,000) | (2,567,100)
Property, Plant and Equipment, Net | 11,403,800 | 10,968,100
Construction Work in Progress | 632,200 | 498,900
Total Property, Plant and Equipment, Net | 12,035,967 | 11,467,024
NSTAR Electric |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 8,816,500 | 8,410,000
Transmission - Electric | 5,536,600 | 5,333,800
Solar | 200,800 | 200,800
Property, Plant and Equipment, Gross | 14,553,900 | 13,944,600
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (3,535,500) | (3,381,200)
Property, Plant and Equipment, Net | 11,018,400 | 10,563,400
Construction Work in Progress | 1,390,800 | 1,063,600
Total Property, Plant and Equipment, Net | 12,409,156 | 11,626,968
PSNH |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution - Electric | 2,745,100 | 2,586,400
Transmission - Electric | 2,352,400 | 2,212,000
Solar | 0 | 0
Property, Plant and Equipment, Gross | 5,097,500 | 4,798,400
Less: Accumulated Depreciation |  |
Total Accumulated Depreciation | (974,200) | (912,300)
Property, Plant and Equipment, Net | 4,123,300 | 3,886,100
Construction Work in Progress | 309,700 | 174,100
Total Property, Plant and Equipment, Net | $ 4,433,033 | $ 4,060,224

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: |