XML 75 R53.htm IDEA: XBRL DOCUMENT
v3.21.2

Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Detail of regulatory liabilities |  |  |
Current |  | $ 327,612 | $ 229,088
Non-Current |  | 2,443,312 | 2,450,169
Asset retirement obligations |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 567,900 | 506,049
Other postretirement benefits |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 47,798 | 37,705
Non-Current |  | 314,218 | 349,588
Removal costs |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 69,348 | 52,844
Non-Current |  | 61,601 | 103,008
Deferred fuel and purchased power — mark-to-market (Note 7) |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 82,082 | 0
Non-Current |  | 27,305 | 0
Income taxes — change in rates |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,839 | 2,839
Non-Current |  | 65,319 | 66,553
Four Corners coal reclamation |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 5,461 | 5,460
Non-Current |  | 49,904 | 49,435
Income taxes — deferred investment tax credit |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,231 | 2,231
Non-Current |  | 47,677 | 48,648
Spent nuclear fuel |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 6,510 | 6,768
Non-Current |  | 41,815 | 44,221
Renewable energy standard |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 30,665 | 39,442
Non-Current |  | 0 | 103
Property tax deferral |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 16,188 | 13,856
Demand side management |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 3,149 | 10,819
Non-Current |  | 12,457 | 0
Sundance maintenance |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 556 | 2,989
Non-Current |  | 12,312 | 11,508
FERC transmission true up |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,547 | 6,598
Non-Current |  | 3,511 | 3,008
TCA balancing account |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 10,750 | 2,902
Non-Current |  | 159 | 4,672
Tax expense adjustor mechanism |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,148 | 7,089
Non-Current |  | 0 | 0
Tax expense adjustor mechanism | Forecast |  |  |
Detail of regulatory liabilities |  |  |
Current | $ 7,000 |  |
Deferred gains on utility property |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 2,423 | 2,423
Non-Current |  | 333 | 1,544
Active union medical trust |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 0 | 0
Non-Current |  | 2,347 | 6,057
Other |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 484 | 409
Non-Current |  | 289 | 189
ACC | Excess deferred income taxes - Tax Act |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 41,381 | 41,330
Non-Current |  | 993,982 | 1,012,583
FERC | Excess deferred income taxes - Tax Act |  |  |
Detail of regulatory liabilities |  |  |
Current |  | 7,240 | 7,240
Non-Current |  | $ 225,995 | $ 229,147

X
- Definition The amount for the individual regulatory current liability including deferred fuel and purchased power as itemized in a table of regulatory current liabilities as of the end of the period. + References No definition available. + Details
Name: | pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent
Namespace Prefix: | pnw_
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 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 http://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=us-gaap_AssetRetirementObligationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=pnw_TaxCutsandJobsActof2017ExcessDeferredIncomeTaxesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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