XML 60 R42.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Detail of regulatory assets |  |
Regulatory assets, current | $ 108,596 | $ 149,555
Regulatory assets, non-current | 1,190,622 | 1,214,146
Pension |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 617,283 | 619,223
Retired power plant costs |  |
Detail of regulatory assets |  |
Regulatory assets, current | 9,913 | 9,913
Regulatory assets, non-current | 122,554 | 127,518
Income taxes — allowance for funds used during construction (AFUDC) equity |  |
Detail of regulatory assets |  |
Regulatory assets, current | 5,419 | 5,495
Regulatory assets, non-current | 137,611 | 133,712
Deferred fuel and purchased power — mark-to-market (Note 6) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 30,986 | 71,852
Regulatory assets, non-current | 40,573 | 69,697
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 6,689 | 6,689
Regulatory assets, non-current | 60,238 | 63,582
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,851 | 1,766
Regulatory assets, non-current | 47,826 | 48,462
Lost fixed cost recovery (b) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 49,852 | 45,507
Regulatory assets, non-current | 0 | 0
Palo Verde VIEs (Note 5) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 18,465 | 18,143
Deferred compensation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 35,701 | 34,751
Deferred property taxes |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 62,726 | 50,453
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,592 | 1,515
Regulatory assets, non-current | 16,919 | 16,375
Tax expense of Medicare subsidy |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,512 | 1,520
Regulatory assets, non-current | 11,647 | 12,163
Transmission vegetation management |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 4,543
Regulatory assets, non-current | 0 | 0
Mead-Phoenix transmission line CIAC |  |
Detail of regulatory assets |  |
Regulatory assets, current | 332 | 332
Regulatory assets, non-current | 10,874 | 11,040
Transmission cost adjustor (b) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 | 0
Regulatory assets, non-current | 2,814 | 2,942
Coal reclamation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 418 | 418
Regulatory assets, non-current | 5,391 | 6,085
Other |  |
Detail of regulatory assets |  |
Regulatory assets, current | 32 | 5
Regulatory assets, non-current | $ 0 | $ 0

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://www.xbrl.org/2003/role/presentationRef -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_RetiredPowerPlantCostsMember
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_DeferredFuelAndPurchasedPowerMTMCostsMember
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_InvestmentCreditMember
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=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
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=pnw_DeferredPropertyTaxesMember
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_TaxExpenseOfMedicareSubsidyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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