XML 62 R50.htm IDEA: XBRL DOCUMENT
v3.22.1

Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Detail of regulatory assets |  |
Current | $ 486,260 | $ 518,524
Non-Current | 1,184,246 | 1,192,987
Pension |  |
Detail of regulatory assets |  |
Current | 0 | 0
Non-Current | 506,280 | 509,751
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Current | 354,816 | 388,148
Non-Current | 0 | 0
Income taxes — allowance for funds used during construction (“AFUDC”) equity |  |
Detail of regulatory assets |  |
Current | 7,625 | 7,625
Non-Current | 165,071 | 164,768
Ocotillo deferral |  |
Detail of regulatory assets |  |
Current | 9,507 | 9,507
Non-Current | 135,766 | 138,143
Retired power plant costs |  |
Detail of regulatory assets |  |
Current | 15,455 | 15,160
Non-Current | 94,902 | 99,681
SCR deferral |  |
Detail of regulatory assets |  |
Current | 8,147 | 8,147
Non-Current | 95,588 | 97,624
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Current | 57,808 | 63,889
Non-Current | 0 | 0
Deferred property taxes |  |
Detail of regulatory assets |  |
Current | 8,569 | 8,569
Non-Current | 38,915 | 41,057
Deferred compensation |  |
Detail of regulatory assets |  |
Current | 0 | 0
Non-Current | 35,355 | 33,997
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Current | 826 | 1,129
Non-Current | 23,899 | 23,639
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Current | 8,077 | 8,077
Non-Current | 13,979 | 15,998
Palo Verde VIEs (Note 6) |  |
Detail of regulatory assets |  |
Current | 0 | 0
Non-Current | 21,053 | 21,094
Coal reclamation |  |
Detail of regulatory assets |  |
Current | 2,978 | 2,978
Non-Current | 13,118 | 13,862
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Current | 1,648 | 1,648
Non-Current | 8,976 | 9,372
Active Union Medical Trust |  |
Detail of regulatory assets |  |
Current | 0 | 0
Non-Current | 10,453 | 1,175
TCA balancing account |  |
Detail of regulatory assets |  |
Current | 8,205 | 170
Non-Current | 2,038 | 3,663
Mead-Phoenix transmission line contributions in aid of construction (“CIAC”) |  |
Detail of regulatory assets |  |
Current | 332 | 332
Non-Current | 8,965 | 9,048
Tax expense adjustor mechanism |  |
Detail of regulatory assets |  |
Current | 656 | 656
Non-Current | 5,681 | 5,845
Tax expense of Medicare subsidy |  |
Detail of regulatory assets |  |
Current | 1,235 | 1,235
Non-Current | 2,406 | 2,469
Other |  |
Detail of regulatory assets |  |
Current | 376 | 1,254
Non-Current | $ 1,801 | $ 1,801

X
- Definition The amount for the individual regulatory current asset including deferred fuel and purchased power as itemized in a table of regulatory current assets as of the end of the period. + References No definition available. + Details
Name: | pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent
Namespace Prefix: | pnw_
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_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 -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_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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