XML 120 R99.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Jointly-Owned Facilities (Details) - Arizona Public Service Company $ in Thousands | Dec. 31, 2023 USD ($)
--- | ---
Palo Verde Units 1 and 3 |
Interests in jointly-owned facilities |
Percent Owned | 29.10%
Plant in Service | $ 1,990,237
Accumulated Depreciation | 1,087,614
Construction Work in Progress | $ 21,442
Palo Verde Unit 2 |
Interests in jointly-owned facilities |
Percent Owned | 16.80%
Plant in Service | $ 681,483
Accumulated Depreciation | 387,485
Construction Work in Progress | $ 12,700
Palo Verde Common |
Interests in jointly-owned facilities |
Percent Owned | 28.00%
Plant in Service | $ 857,807
Accumulated Depreciation | 356,962
Construction Work in Progress | 65,911
Palo Verde Sale Leaseback |
Interests in jointly-owned facilities |
Plant in Service | 351,050
Accumulated Depreciation | 264,624
Construction Work in Progress | $ 0
Four Corners Generating Station |
Interests in jointly-owned facilities |
Percent Owned | 63.00%
Plant in Service | $ 1,748,436
Accumulated Depreciation | 659,780
Construction Work in Progress | $ 29,586
Cholla Common Facilities |
Interests in jointly-owned facilities |
Percent Owned | 50.50%
Plant in Service | $ 250,994
Accumulated Depreciation | 167,357
Construction Work in Progress | $ 7,487
ANPP 500kV System |
Interests in jointly-owned facilities |
Percent Owned | 33.40%
Plant in Service | $ 136,145
Accumulated Depreciation | 58,252
Construction Work in Progress | $ 4,801
Navajo Southern System |
Interests in jointly-owned facilities |
Percent Owned | 25.20%
Plant in Service | $ 87,185
Accumulated Depreciation | 36,743
Construction Work in Progress | $ 550
Palo Verde — Yuma 500kV System |
Interests in jointly-owned facilities |
Percent Owned | 25.30%
Plant in Service | $ 24,057
Accumulated Depreciation | 7,912
Construction Work in Progress | $ 432
Four Corners Switchyards |
Interests in jointly-owned facilities |
Percent Owned | 57.50%
Plant in Service | $ 84,279
Accumulated Depreciation | 21,918
Construction Work in Progress | $ 161
Phoenix — Mead System |
Interests in jointly-owned facilities |
Percent Owned | 17.10%
Plant in Service | $ 39,772
Accumulated Depreciation | 20,679
Construction Work in Progress | $ 257
Palo Verde — Rudd 500kV System |
Interests in jointly-owned facilities |
Percent Owned | 50.00%
Plant in Service | $ 95,736
Accumulated Depreciation | 32,665
Construction Work in Progress | $ 731
Morgan — Pinnacle Peak System |
Interests in jointly-owned facilities |
Percent Owned | 63.20%
Plant in Service | $ 117,080
Accumulated Depreciation | 26,990
Construction Work in Progress | $ 229
Round Valley System |
Interests in jointly-owned facilities |
Percent Owned | 50.00%
Plant in Service | $ 548
Accumulated Depreciation | 205
Construction Work in Progress | $ 0
Palo Verde — Morgan System |
Interests in jointly-owned facilities |
Percent Owned | 87.50%
Plant in Service | $ 268,629
Accumulated Depreciation | 40,962
Construction Work in Progress | $ 8,053
Hassayampa — North Gila System |
Interests in jointly-owned facilities |
Percent Owned | 80.00%
Plant in Service | $ 151,684
Accumulated Depreciation | 24,618
Construction Work in Progress | $ 0
Cholla 500kV Switchyard |
Interests in jointly-owned facilities |
Percent Owned | 85.70%
Plant in Service | $ 8,445
Accumulated Depreciation | 2,760
Construction Work in Progress | $ 0
Saguaro 500kV Switchyard |
Interests in jointly-owned facilities |
Percent Owned | 60.00%
Plant in Service | $ 21,627
Accumulated Depreciation | 14,060
Construction Work in Progress | $ 17
Kyrene — Knox System |
Interests in jointly-owned facilities |
Percent Owned | 50.00%
Plant in Service | $ 578
Accumulated Depreciation | 340
Construction Work in Progress | $ 0
Agua Fria Switchyard |
Interests in jointly-owned facilities |
Percent Owned | 10.00%
Plant in Service | $ 0
Accumulated Depreciation | 0
Construction Work in Progress | $ 77

X
- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
Namespace Prefix: | us-gaap_
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_JointlyOwnedUtilityPlantInterestsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeUnits1And3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeUnit2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeCommonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeSaleLeasebackMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_FourCornersUnits4And5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_ChollaCommonFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_ANPP500KVSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_NavajoSouthernSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeYuma500KVSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_FourCornersSwitchyardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PhoenixMeadSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeEstrella500KVSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_MorganPinnaclePeakSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_RoundValleySystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_PaloVerdeMorganSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_HassayampaNorthGilaSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_Cholla500SwitchyardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_Saguaro500SwitchyardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_KyreneKnoxSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnw_AguaFriaSwitchyardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |