XML 75 R62.htm IDEA: XBRL DOCUMENT
v3.25.3

Regulatory Matters - ACC General Retail Rate Cases (Details) $ in Millions | Jun. 13, 2025 USD ($) $ / KWH_Kilowatt_hour | Feb. 22, 2024 USD ($)
--- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |
Revenue increase (decrease) |  | $ 491.7
ACC |  |
Public Utilities, General Disclosures [Line Items] |  |
Recommended return on equity, percentage |  | 9.55%
Increment of fair value rate, percentage |  | 0.25%
ACC | Rate Case Filing with Arizona Corporation Commission | ACC |  |
Public Utilities, General Disclosures [Line Items] |  |
Base fuel and purchased power costs rate (in dollars per kWh) | $ / KWH_Kilowatt_hour | 0.043881 |
APS | ACC |  |
Public Utilities, General Disclosures [Line Items] |  |
Proposed base rate increase | $ 579.5 |
Total revenue deficiency | $ 662.4 |
APS | Rate Case Filing with Arizona Corporation Commission | ACC |  |
Public Utilities, General Disclosures [Line Items] |  |
Approximate percentage of increase in average residential customer bill | 13.99% |
Rate matter, cost base rate | $ 12,500.0 |
Effective fair value percentage |  | 4.39%

X
- Definition Public Utilities, Effective Fair Value Rate, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesEffectiveFairValueRatePercentage
Namespace Prefix: | pnw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Increment of Fair Value Rate, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesIncrementOfFairValueRatePercentage
Namespace Prefix: | pnw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Recommended Return on Equity, Percentage + References No definition available. + Details
Name: | pnw_PublicUtilitiesRecommendedReturnOnEquityPercentage
Namespace Prefix: | pnw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rate Matter, Approximate Percentage Of Increase In Average Residential Customer Bill + References No definition available. + Details
Name: | pnw_RateMatterApproximatePercentageOfIncreaseInAverageResidentialCustomerBill
Namespace Prefix: | pnw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate Matter, Cost Base Rate + References No definition available. + Details
Name: | pnw_RateMatterCostBaseRate
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory Impact, Total Revenue Deficiency + References No definition available. + Details
Name: | pnw_RegulatoryImpactTotalRevenueDeficiency
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Regulatory Matters, Base Fuel And Purchased Power Costs Rate + References No definition available. + Details
Name: | pnw_RegulatoryMattersBaseFuelAndPurchasedPowerCostsRate
Namespace Prefix: | pnw_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Matters, Proposed Base Rate Increase + References No definition available. + Details
Name: | pnw_RegulatoryMattersProposedBaseRateIncrease
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Matters, Revenue Increase (Decrease) + References No definition available. + Details
Name: | pnw_RegulatoryMattersRevenueIncreaseDecrease
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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