XML 106 R88.htm IDEA: XBRL DOCUMENT
v3.21.1

Regulatory Assets and Liabilities - Canada Electric Utilities (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) km | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 16, 2020 CAD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory Liabilities |  | $ 1,961 | $ 2,181 |  |
Utilities Operating Expense, Depreciation and Amortization |  | 881 | 903 |  |
Contractual Obligation, to be Paid, Year One |  | 1,736 |  |  |
Contractual Obligation, to be Paid, Year Two |  | 1,143 |  |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  | 1,419 | 1,464 |  |
Canadian Electric Utilities | Operating |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Utilities Operating Expense, Depreciation and Amortization |  | 236 | 231 |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  | 282 | 313 |  |
Regulated fuel adjustment mechanism |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory Liabilities |  | $ 21 | 115 |  |
NSPI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery Period |  | 3 years |  |  |
Regulatory Asset Recovery Assessments |  | As approved on December 6, 2019 as part of NSPI’s three-year Fuel Stability Plan, differences between actual fuel costs and fuel revenues recovered from customers for the years 2020 to 2022, will be recovered or returned to customers after 2022. The UARB’s decision to approve the Fuel Stability Plan directed that any annual non-fuel revenues above NSPI’s approved range of ROE are to be applied to the FAM. |  |  |
NSPI | Canadian Electric Utilities | Operating |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery Period |  | 3 years |  |  |
NSPI | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery Period |  | 3 years |  |  |
Regulatory Liabilities |  | $ 145 |  |  | $ 172
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes |  |  |  |  | 23
Approved payment in period |  | 135 |  |  |
Holdback payable |  | 4 |  |  |
Phase-in Plan, Amount of Capitalized Costs Recovered |  | 40 | $ 35 | $ 17 |
Contractual Obligation, to be Paid, Year One |  | 164 |  |  |
Contractual Obligation, to be Paid, Year Two |  | $ 162 |  |  |
NSPI | Range, Minimum | Canadian Electric Utilities | Operating |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved regulated return on equity |  | 8.75% | 8.75% |  |
NSPI | Range, Maximum | Canadian Electric Utilities | Operating |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved regulated return on equity |  | 9.25% | 9.25% |  |
Regulated common equity component |  | 40.00% | 40.00% |  |
NSPI | Scenario Plan | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Holdback payable |  | $ 10 |  |  |
Phase-in Plan, Amount of Capitalized Costs Recovered | $ 12 |  |  |  |
NSPI | Regulated fuel adjustment mechanism | Scenario Plan | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory Asset Recovery Assessments |  | The UARB’s decision to approve NSPI’s 2020-2022 fuel stability plan outlined the treatment of the reduced 2019 NSPML assessment of $52 million plus interest. The majority of the reduced assessment was refunded to most customers through a reduction incorporated into their 2020 rates and the remaining customers received a one-time on bill credit in 2020. As at December 31, 2020, $40 million plus interest has been refunded to customers, with the remaining $12 million plus interest to be returned to customers subsequent to 2022. |  |  |
NSPI | Public Utilities Act | Canadian Electric Utilities | Operating |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amended, Percentage |  | 1.50% |  |  |
Emera Newfoundland and Labrador Holdings Inc. | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Equipment, Transmission and Distribution |  | $ 1,600 |  |  |
Length Of Pipeline | km |  | 170 |  |  |
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes |  | $ 10 |  |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  | $ 115 |  |  |
Interim cost assessment, holdback |  | The payments were subject to a holdback of $10 million pending UARB agreement that a minimum of $10 million in benefits from the Maritime Link are realized for NSPI customers. If the $10 million in benefits is realized, the UARB will direct NSPI to pay the $10 million to NSPML for that year. If not realized, then the UARB will direct NSPI to pay to NSPML only that portion that is realized and the balance will be refunded to customers through NSPI’s FAM. |  |  |
Cash and Securities Segregated under Federal and Other Regulations |  |  |  |  | $ 23
Emera Newfoundland and Labrador Holdings Inc. | Range, Minimum | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved regulated return on equity |  | 8.75% |  |  |
Emera Newfoundland and Labrador Holdings Inc. | Range, Maximum | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved regulated return on equity |  | 9.25% |  |  |
Regulated common equity component |  | 30.00% |  |  |
Emera Newfoundland and Labrador Holdings Inc. | Regulated fuel adjustment mechanism | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Holdback payable |  | $ 10 |  |  |
Emera Newfoundland and Labrador Holdings Inc. | Regulated fuel adjustment mechanism | Scenario Plan | Canadian Electric Utilities | Operating | NSP Maritime Link Inc. |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Phase-in Plan, Amount of Costs Deferred for Rate-making Purposes |  |  | $ 52 |  |
Regulatory Asset Recovery Assessments |  | In response to the delayed timing of energy delivery from the Muskrat Falls project, which is being developed by Nalcor Energy, the approved Maritime Link interim assessment payments reflected a reduction in NSPML’s assessment in each of 2018 and 2019, related to depreciation and amortization expenses. NSPI refunded the reduced 2018 NSPML assessment to customers in 2018 and 2019, by providing a credit to customers of $17 million and $35 million, respectively. The UARB’s decision to approve NSPI’s 2020-2022 fuel stability plan outlined the treatment of the reduced 2019 NSPML assessment of $52 million plus interest. The majority of the reduced assessment was refunded to most customers through a reduction incorporated into their 2020 rates and the remaining customers received a one-time on bill credit in 2020. |  |  |

X
- Definition The length of a long pipe, underground, for conveying oil, gas, etc. over long distances. + References No definition available. + Details
Name: | ema_LengthOfPipeline
Namespace Prefix: | ema_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers). + References No definition available. + Details
Name: | us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualProvision
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition If estimable, describe the recovery that could be expected to result from a right to proceed against a third party such as an insurer or co-defendant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyEstimatedRecoveryFromThirdParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The sum total amount of allowable costs capitalized in the period pertaining to a phase-in plan and previously capitalized costs that were recovered (recognized in earnings) during the period through rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499958&loc=d3e44213-110381 + Details
Name: | us-gaap_PhaseInPlanAmountOfCapitalizedCostsRecovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of allowable costs capitalized during the period by the entity pertaining to Phase-In plans which were deferred on the expectation of future recovery. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499958&loc=d3e44213-110381 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
Name: | us-gaap_PhaseInPlanAmountOfCostsDeferredForRateMakingPurposes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage of public utility's requested equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's amended requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmendedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Describes the continual or periodic assessment of the probability of future recovery of regulatory assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499898&loc=d3e44174-110380 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557228&loc=d3e43603-110378 + Details
Name: | us-gaap_RegulatoryAssetRecoveryAssessments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 http://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 Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 55 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121594574&loc=d3e44360-110383 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating expense for depreciation and amortization of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of operating expenses for the period that are associated with the utility's normal revenue producing operation; including selling, general, and administrative expenses, costs incurred for routine plant repairs and maintenance, and operations. + References No definition available. + Details
Name: | us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ema_CanadianElectricUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=ema_NovaScotiaPowerIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ema_NspMaritimeLinkIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=ema_PublicUtilitiesActOfNovaScotiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=ema_EmeraNewfoundlandAndLabradorHoldingsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |