XML 101 R82.htm IDEA: XBRL DOCUMENT
v3.21.2

Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge | Jun. 30, 2021 MWh $ / MWh $ / MWh
--- | ---
NI HUB, Expiry December 2031 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 2,479,234
Receive average prices (per MW-hr) | $ / MWh | 23.50
Illinois Hub, Expiry September 2030 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 4,822,668
Receive average prices (per MW-hr) | $ / MWh | 24.54
PJM Western HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 577,686
Receive average prices (per MW-hr) | $ / MWh | 33.03
NI HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 2,682,564
Receive average prices (per MW-hr) | $ / MWh | 24.20
ERCOT North HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 2,136,795
Receive average prices (per MW-hr) | $ / MWh | 36.46

X
- Definition The average strike price on the group of price risk option contracts such as put options or call options. + References No definition available. + Details
Name: | us-gaap_DerivativeAveragePriceRiskOptionStrikePrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal number of units used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123477628&loc=d3e90205-114008 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=aqunf_NIHUBExpiryDecember2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=aqunf_IllinoisHubExpirySeptember2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=aqunf_PJMWesternHUBExpiryDecember2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=aqunf_NIHUBExpiryDecember2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=aqunf_ERCOTNorthHUBExpiryDecember2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |