XML 87 R68.htm IDEA: XBRL DOCUMENT
v3.23.3

REGULATORY ACCOUNTING - Components of Regulatory Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 5,856,600 | $ 5,578,300
Less: Current Portion | 1,507,888 | 1,335,491
Total Long-Term Regulatory Assets | 4,348,700 | 4,242,794
Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,700,600 | 1,379,100
Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,173,300 | 1,075,300
Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 863,400 | 921,700
Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 879,600 | 853,300
Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 403,300 | 435,700
Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 268,300 | 281,000
Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 136,600 | 181,800
Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 135,000 | 127,900
Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 296,500 | 322,500
CL&P |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,982,600 | 1,907,800
Less: Current Portion | 383,672 | 314,089
Total Long-Term Regulatory Assets | 1,598,934 | 1,593,693
CL&P | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 882,700 | 799,300
CL&P | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 254,300 | 216,800
CL&P | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 143,200 | 156,700
CL&P | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 504,500 | 491,100
CL&P | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
CL&P | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
CL&P | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 136,600 | 181,800
CL&P | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 37,800 | 35,900
CL&P | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 23,500 | 26,200
NSTAR Electric |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 1,828,600 | 1,714,400
Less: Current Portion | 638,464 | 492,759
Total Long-Term Regulatory Assets | 1,190,138 | 1,221,619
NSTAR Electric | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 553,900 | 484,400
NSTAR Electric | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 473,400 | 391,500
NSTAR Electric | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 278,000 | 299,500
NSTAR Electric | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 125,700 | 115,600
NSTAR Electric | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 230,400 | 241,200
NSTAR Electric | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
NSTAR Electric | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 70,900 | 68,200
NSTAR Electric | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 96,300 | 114,000
PSNH |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 916,500 | 696,200
Less: Current Portion | 177,120 | 102,240
Total Long-Term Regulatory Assets | 739,372 | 593,974
PSNH | Storm Costs, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 264,000 | 95,400
PSNH | Regulatory Tracking Mechanisms |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 166,100 | 73,700
PSNH | Benefit Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 51,800 | 56,600
PSNH | Income Taxes, Net |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 17,600 | 16,000
PSNH | Securitized Stranded Costs |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 403,300 | 435,700
PSNH | Goodwill-related |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
PSNH | Derivative Liabilities |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 0 | 0
PSNH | Asset Retirement Obligations |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | 4,700 | 4,400
PSNH | Other Regulatory Assets |  |
Regulatory Assets [Line Items] |  |
Total Regulatory Assets | $ 9,000 | $ 14,400

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

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_StormRestorationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_RegulatoryTrackerDeferralsRegulatoryAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_StrandedCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_GoodwillRegulatoryAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_RegulatoryAssetsOffsettingDerivativeLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_AssetRetirementObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=es_OtherRegulatoryAssetsMember
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: |