XML 87 R68.htm IDEA: XBRL DOCUMENT
v3.23.1

REGULATORY ACCOUNTING - Components of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 4,624,900 | $ 4,821,100
Less: Current Portion | 650,538 | 890,786
Total Long-Term Regulatory Liabilities | 3,974,374 | 3,930,305
EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 2,601,800 | 2,619,300
Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 705,400 | 670,600
Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 653,600 | 890,800
Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 291,400 | 270,900
AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 103,800 | 98,200
Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 49,200 | 55,400
Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 219,700 | 215,900
CL&P |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,401,900 | 1,599,400
Less: Current Portion | 124,640 | 336,048
Total Long-Term Regulatory Liabilities | 1,277,281 | 1,263,396
CL&P | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 980,000 | 983,600
CL&P | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 144,200 | 130,800
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 145,000 | 361,000
CL&P | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 38,300 | 34,500
CL&P | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 49,800 | 48,200
CL&P | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 600 | 700
CL&P | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 44,000 | 40,600
NSTAR Electric |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 1,932,600 | 1,921,300
Less: Current Portion | 375,047 | 373,221
Total Long-Term Regulatory Liabilities | 1,557,614 | 1,548,081
NSTAR Electric | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 933,900 | 944,300
NSTAR Electric | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 412,900 | 405,300
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 341,600 | 336,100
NSTAR Electric | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 148,500 | 139,700
NSTAR Electric | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 54,000 | 50,000
NSTAR Electric | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 27,100 | 31,400
NSTAR Electric | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 14,600 | 14,500
PSNH |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 476,900 | 553,600
Less: Current Portion | 86,569 | 161,963
Total Long-Term Regulatory Liabilities | 390,290 | 391,628
PSNH | EDIT due to Tax Cuts and Jobs Act of 2017 |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 346,100 | 348,600
PSNH | Cost of Removal |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 20,200 | 14,700
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 73,200 | 155,000
PSNH | Deferred Portion of Non-Service Income Components of Pension, SERP and PBOP |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 30,800 | 28,800
PSNH | AFUDC - Transmission |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | Benefit Costs |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | 0 | 0
PSNH | Other Regulatory Liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total Regulatory Liabilities | $ 6,600 | $ 6,500

X
- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
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_RegulatoryLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + 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 210.5-02.24) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_ExcessADITduetotaxCutsandJobsActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_CostOfRemovalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_RegulatoryTrackerDeferralsRegulatoryLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_DeferredPortionOfNonServiceIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_AfudcTransmissionIncentiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_BenefitCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=es_OtherRegulatoryLiabilitiesMember
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: |