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    <link:label id="lab_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement_64D473E7FEE956DA2F028E4F1947DC2F_negatedLabel_en-US" xlink:label="lab_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement_64D473E7FEE956DA2F028E4F1947DC2F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement" xlink:label="loc_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement_64D473E7FEE956DA2F028E4F1947DC2F" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral_F515D02B8AAD2FBC23578E4F19479117" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Regulatory Liability [Domain]</link:label>
    <link:label id="lab_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Liability [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RegulatoryLiabilityDomain" xlink:label="loc_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3" xlink:to="lab_us-gaap_RegulatoryLiabilityDomain_92FAD9BA0102CE2BA3136920AA197AB3" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetRetirementObligationCostsMember_7B7A9039DB137C5A7EA46920AA19A059_terseLabel_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCostsMember_7B7A9039DB137C5A7EA46920AA19A059" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset retirement obligations</link:label>
    <link:label id="lab_us-gaap_AssetRetirementObligationCostsMember_7B7A9039DB137C5A7EA46920AA19A059_label_en-US" xlink:label="lab_us-gaap_AssetRetirementObligationCostsMember_7B7A9039DB137C5A7EA46920AA19A059" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Asset Retirement Obligation Costs [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetRetirementObligationCostsMember" xlink:label="loc_us-gaap_AssetRetirementObligationCostsMember_7B7A9039DB137C5A7EA46920AA19A059" xlink:type="locator" />
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    <link:label id="lab_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D_terseLabel_en-US" xlink:label="lab_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Removal costs</link:label>
    <link:label id="lab_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D_label_en-US" xlink:label="lab_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Removal Costs [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RemovalCostsMember" xlink:label="loc_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D" xlink:to="lab_us-gaap_RemovalCostsMember_25EA4C1B48A14CDFEEF36920AA19556D" xlink:type="arc" />
    <link:label id="lab_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B_terseLabel_en-US" xlink:label="lab_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other postretirement benefits</link:label>
    <link:label id="lab_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B_label_en-US" xlink:label="lab_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Postretirement Benefit Costs [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PostretirementBenefitCostsMember" xlink:label="loc_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B" xlink:to="lab_us-gaap_PostretirementBenefitCostsMember_6056D539AEC0A01C322C6920AA19725B" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D_verboseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes &#8212; deferred investment tax credit</link:label>
    <link:label id="lab_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D_label_en-US" xlink:label="lab_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Tax Credit Carryforward [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentCreditMember" xlink:label="loc_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D" xlink:to="lab_us-gaap_InvestmentCreditMember_ED39511019570A7B55506920AA19579D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxChargesMember_A55FE4FFFB17564D1F1A6920AA19BFB4_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxChargesMember_A55FE4FFFB17564D1F1A6920AA19BFB4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes &#8212; change in rates</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxChargesMember_A55FE4FFFB17564D1F1A6920AA19BFB4_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxChargesMember_A55FE4FFFB17564D1F1A6920AA19BFB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Charge [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredIncomeTaxChargesMember" xlink:label="loc_us-gaap_DeferredIncomeTaxChargesMember_A55FE4FFFB17564D1F1A6920AA19BFB4" xlink:type="locator" />
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    <link:label id="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977_terseLabel_en-US" xlink:label="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Spent nuclear fuel</link:label>
    <link:label id="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977_label_en-US" xlink:label="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Spent Nuclear Fuel [Member]</link:label>
    <link:label id="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977_documentation_en-US" xlink:label="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Liability associated with spent nuclear fuel.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SpentNuclearFuelMember" xlink:label="loc_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:to="lab_pnw_SpentNuclearFuelMember_73D8597B4293B1A2EF186920AA19E977" xlink:type="arc" />
    <link:label id="lab_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4_terseLabel_en-US" xlink:label="lab_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Renewable energy standard (b)</link:label>
    <link:label id="lab_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4_label_en-US" xlink:label="lab_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Renewable Energy Program [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RenewableEnergyProgramMember" xlink:label="loc_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4" xlink:to="lab_us-gaap_RenewableEnergyProgramMember_970AC3960F583C09716D6920AA1937D4" xlink:type="arc" />
    <link:label id="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23_terseLabel_en-US" xlink:label="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Demand side management (b)</link:label>
    <link:label id="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23_label_en-US" xlink:label="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Demand Side Management [Member]</link:label>
    <link:label id="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23_documentation_en-US" xlink:label="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Demand Side Management [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DemandSideManagementMember" xlink:label="loc_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:to="lab_pnw_DemandSideManagementMember_6D49DFFBC89AFF1F24C26920AA190B23" xlink:type="arc" />
    <link:label id="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25_terseLabel_en-US" xlink:label="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sundance maintenance</link:label>
    <link:label id="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25_label_en-US" xlink:label="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sundance Maintenance [Member]</link:label>
    <link:label id="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25_documentation_en-US" xlink:label="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sundance Maintenance [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SundanceMaintenanceMember" xlink:label="loc_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:to="lab_pnw_SundanceMaintenanceMember_D4382F4E25A78A381F656920AA1ABB25" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116_terseLabel_en-US" xlink:label="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred gains on utility property</link:label>
    <link:label id="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116_label_en-US" xlink:label="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Gains on Utility Property [Member]</link:label>
    <link:label id="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116_documentation_en-US" xlink:label="lab_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Gains on Utility Property [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredGainsonUtilityPropertyMember" xlink:label="loc_pnw_DeferredGainsonUtilityPropertyMember_CA0364E9A98E577024A86920AA1A8116" xlink:type="locator" />
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    <link:label id="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862_terseLabel_en-US" xlink:label="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Four Corners coal reclamation</link:label>
    <link:label id="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862_label_en-US" xlink:label="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Corners Coal Reclamation [Member]</link:label>
    <link:label id="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862_documentation_en-US" xlink:label="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Four Corners Coal Reclamation [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_FourCornersCoalReclamationMember" xlink:label="loc_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:to="lab_pnw_FourCornersCoalReclamationMember_314478D6B897132021E16920AA1AB862" xlink:type="arc" />
    <link:label id="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254_terseLabel_en-US" xlink:label="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254_label_en-US" xlink:label="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Regulatory Liabilities [Member]</link:label>
    <link:label id="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254_documentation_en-US" xlink:label="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Miscellaneous regulatory liabilities which are individually insignificant.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_OtherRegulatoryLiabilitiesMember" xlink:label="loc_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:to="lab_pnw_OtherRegulatoryLiabilitiesMember_831EC483751237A893306920AA1A4254" xlink:type="arc" />
    <link:label id="lab_us-gaap_RegulatoryLiabilitiesLineItems_1F3CC195CE627C8755626920AA1A10B9_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilitiesLineItems_1F3CC195CE627C8755626920AA1A10B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Detail of regulatory liabilities</link:label>
    <link:label id="lab_us-gaap_RegulatoryLiabilitiesLineItems_1F3CC195CE627C8755626920AA1A10B9_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilitiesLineItems_1F3CC195CE627C8755626920AA1A10B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Liabilities [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RegulatoryLiabilitiesLineItems" xlink:label="loc_us-gaap_RegulatoryLiabilitiesLineItems_1F3CC195CE627C8755626920AA1A10B9" xlink:type="locator" />
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    <link:label id="lab_pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent_A0027C96F47A9964CCC56920AA1A6515_terseLabel_en-US" xlink:label="lab_pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent_A0027C96F47A9964CCC56920AA1A6515" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Regulatory liabilities, current</link:label>
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    <link:label id="lab_us-gaap_RegulatoryLiabilityNoncurrent_57A543930F7068D925E66920AA1AD3B4_positiveLabel_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityNoncurrent_57A543930F7068D925E66920AA1AD3B4" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:type="resource" xml:lang="en-US">Regulatory liabilities, non-current</link:label>
    <link:label id="lab_us-gaap_RegulatoryLiabilityNoncurrent_57A543930F7068D925E66920AA1AD3B4_label_en-US" xlink:label="lab_us-gaap_RegulatoryLiabilityNoncurrent_57A543930F7068D925E66920AA1AD3B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Liability, Noncurrent</link:label>
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    <link:label id="lab_pnw_CashPaidDuringPeriodAbstract_B47C1F15D1BBAEC93636B0903631A541_label_en-US" xlink:label="lab_pnw_CashPaidDuringPeriodAbstract_B47C1F15D1BBAEC93636B0903631A541" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Paid During Period [Abstract]</link:label>
    <link:label id="lab_pnw_CashPaidDuringPeriodAbstract_B47C1F15D1BBAEC93636B0903631A541_documentation_en-US" xlink:label="lab_pnw_CashPaidDuringPeriodAbstract_B47C1F15D1BBAEC93636B0903631A541" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
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    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_A4BA223BACAEF7E1B32DB0903632E216_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_A4BA223BACAEF7E1B32DB0903632E216" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
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    <link:label id="lab_us-gaap_InterestPaidNet_11632A3D325CC3BF8510B0903634EE2D_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_11632A3D325CC3BF8510B0903634EE2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest, net of amounts capitalized</link:label>
    <link:label id="lab_us-gaap_InterestPaidNet_11632A3D325CC3BF8510B0903634EE2D_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_11632A3D325CC3BF8510B0903634EE2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid, Net</link:label>
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    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_DC09A92E34D78B6E656AB09036340EDF_verboseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_DC09A92E34D78B6E656AB09036340EDF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Significant non-cash investing and financing activities:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_DC09A92E34D78B6E656AB09036340EDF" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_C4851F97C6B81ACB78E76907321CFB69" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LossContingenciesTable_B66B5DE091BF969C683E6907322129D0_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_B66B5DE091BF969C683E6907322129D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Table]</link:label>
    <link:label id="lab_us-gaap_LossContingenciesTable_B66B5DE091BF969C683E6907322129D0_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_B66B5DE091BF969C683E6907322129D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss Contingencies [Table]</link:label>
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    <link:label id="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540_terseLabel_en-US" xlink:label="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Four Corners</link:label>
    <link:label id="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540_label_en-US" xlink:label="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Corners [Member]</link:label>
    <link:label id="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540_documentation_en-US" xlink:label="lab_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent information pertaining to Four Corners.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_FourCornersMember" xlink:label="loc_pnw_FourCornersMember_B637F94641E6C86CB8F269073222C540" xlink:type="locator" />
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    <link:label id="lab_pnw_ContaminatedGroundwaterWellsMember_43D2EFA718FD0DEF79D7690732222D17_terseLabel_en-US" xlink:label="lab_pnw_ContaminatedGroundwaterWellsMember_43D2EFA718FD0DEF79D7690732222D17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contaminated groundwater wells</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentAxis_A63C822DE97B551F27BDA81E28A96E28_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_A63C822DE97B551F27BDA81E28A96E28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_A63C822DE97B551F27BDA81E28A96E28_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_A63C822DE97B551F27BDA81E28A96E28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_41F1F08D63A2D7286D81A81E28A9A539_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_41F1F08D63A2D7286D81A81E28A9A539" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_41F1F08D63A2D7286D81A81E28A9A539_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_41F1F08D63A2D7286D81A81E28A9A539" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
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    <link:label id="lab_pnw_LetterofCreditExpiringin2016and2017Member_EDB16136AD28AE0E5983A81E28A9834F_terseLabel_en-US" xlink:label="lab_pnw_LetterofCreditExpiringin2016and2017Member_EDB16136AD28AE0E5983A81E28A9834F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letter of Credit Expiring in 2016 and 2017</link:label>
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    <link:label id="lab_pnw_LetterofCreditExpiringin2016and2017Member_EDB16136AD28AE0E5983A81E28A9834F_documentation_en-US" xlink:label="lab_pnw_LetterofCreditExpiringin2016and2017Member_EDB16136AD28AE0E5983A81E28A9834F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letter of Credit Expiring in 2016 and 2017 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_LetterofCreditExpiringin2016and2017Member" xlink:label="loc_pnw_LetterofCreditExpiringin2016and2017Member_EDB16136AD28AE0E5983A81E28A9834F" xlink:type="locator" />
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    <link:label id="lab_pnw_LettersofCreditExpiringin2019Member_EF8D6BEB3B3F0FA1460DA81E28A98344_terseLabel_en-US" xlink:label="lab_pnw_LettersofCreditExpiringin2019Member_EF8D6BEB3B3F0FA1460DA81E28A98344" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of Credit Expiring in 2017</link:label>
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    <link:label id="lab_pnw_LettersofCreditExpiringin2019Member_EF8D6BEB3B3F0FA1460DA81E28A98344_documentation_en-US" xlink:label="lab_pnw_LettersofCreditExpiringin2019Member_EF8D6BEB3B3F0FA1460DA81E28A98344" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letters of Credit Expiring in 2019 [Member]</link:label>
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    <link:label id="lab_us-gaap_LitigationCaseAxis_3BF4EE8D8A6C514426A5A81E28A961B3_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationCaseAxis_3BF4EE8D8A6C514426A5A81E28A961B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:label id="lab_us-gaap_LitigationCaseAxis_3BF4EE8D8A6C514426A5A81E28A961B3_label_en-US" xlink:label="lab_us-gaap_LitigationCaseAxis_3BF4EE8D8A6C514426A5A81E28A961B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_3BF4EE8D8A6C514426A5A81E28A961B3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LitigationCaseTypeDomain_4F15D85E461D37BCC41AA81E28A95445_label_en-US" xlink:label="lab_us-gaap_LitigationCaseTypeDomain_4F15D85E461D37BCC41AA81E28A95445" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Case [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_4F15D85E461D37BCC41AA81E28A95445" xlink:type="locator" />
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    <link:label id="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501_terseLabel_en-US" xlink:label="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Boron Inclusion on List of Groundwater Constituents</link:label>
    <link:label id="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501_label_en-US" xlink:label="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Boron Inclusion on List of Groundwater Constituents [Member]</link:label>
    <link:label id="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501_documentation_en-US" xlink:label="lab_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Boron Inclusion on List of Groundwater Constituents [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_BoronInclusiononListofGroundwaterConstituentsMember" xlink:label="loc_pnw_BoronInclusiononListofGroundwaterConstituentsMember_104D5EB06BAD6000569EA81E28A92501" xlink:type="locator" />
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    <link:label id="lab_us-gaap_JointlyOwnedUtilityPlantAxis_B46FA74420B1FC995ABBA81E28A9C8AC_terseLabel_en-US" xlink:label="lab_us-gaap_JointlyOwnedUtilityPlantAxis_B46FA74420B1FC995ABBA81E28A9C8AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Jointly Owned Utility Plant [Axis]</link:label>
    <link:label id="lab_us-gaap_JointlyOwnedUtilityPlantAxis_B46FA74420B1FC995ABBA81E28A9C8AC_label_en-US" xlink:label="lab_us-gaap_JointlyOwnedUtilityPlantAxis_B46FA74420B1FC995ABBA81E28A9C8AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Jointly Owned Utility Plant [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_JointlyOwnedUtilityPlantAxis" xlink:label="loc_us-gaap_JointlyOwnedUtilityPlantAxis_B46FA74420B1FC995ABBA81E28A9C8AC" xlink:type="locator" />
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    <link:label id="lab_us-gaap_JointlyOwnedUtilityPlantDomain_B4A9A24E2B6CDCBF68F6A81E28A9DB09_terseLabel_en-US" xlink:label="lab_us-gaap_JointlyOwnedUtilityPlantDomain_B4A9A24E2B6CDCBF68F6A81E28A9DB09" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Jointly Owned Utility Plant [Domain]</link:label>
    <link:label id="lab_us-gaap_JointlyOwnedUtilityPlantDomain_B4A9A24E2B6CDCBF68F6A81E28A9DB09_label_en-US" xlink:label="lab_us-gaap_JointlyOwnedUtilityPlantDomain_B4A9A24E2B6CDCBF68F6A81E28A9DB09" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Jointly Owned Utility Plant [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_JointlyOwnedUtilityPlantDomain" xlink:label="loc_us-gaap_JointlyOwnedUtilityPlantDomain_B4A9A24E2B6CDCBF68F6A81E28A9DB09" xlink:type="locator" />
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    <link:label id="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD_terseLabel_en-US" xlink:label="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Four Corners Units 4 and 5</link:label>
    <link:label id="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD_label_en-US" xlink:label="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Corners Units 4 and 5 [Member]</link:label>
    <link:label id="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD_documentation_en-US" xlink:label="lab_pnw_FourCornersUnits4And5Member_C8637A54017B6E7FFACAA81E28AA87DD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents Four Corners Units 4 and 5, a jointly-owned generating facility of the entity.</link:label>
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    <link:label id="lab_us-gaap_SiteContingencyLineItems_5A738AD027AC882B598EA81E28AA9CAC_terseLabel_en-US" xlink:label="lab_us-gaap_SiteContingencyLineItems_5A738AD027AC882B598EA81E28AA9CAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Environmental Matters</link:label>
    <link:label id="lab_us-gaap_SiteContingencyLineItems_5A738AD027AC882B598EA81E28AA9CAC_label_en-US" xlink:label="lab_us-gaap_SiteContingencyLineItems_5A738AD027AC882B598EA81E28AA9CAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Site Contingency [Line Items]</link:label>
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    <link:label id="lab_pnw_PercentageOfShareOfCostOfControl_A6893DAF6AFD310AF12DA81E28AA48A7_terseLabel_en-US" xlink:label="lab_pnw_PercentageOfShareOfCostOfControl_A6893DAF6AFD310AF12DA81E28AA48A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of share of cost of control</link:label>
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    <link:label id="lab_pnw_PercentageOfShareOfCostOfControl_A6893DAF6AFD310AF12DA81E28AA48A7_documentation_en-US" xlink:label="lab_pnw_PercentageOfShareOfCostOfControl_A6893DAF6AFD310AF12DA81E28AA48A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of share of the cost of control acquired by the entity.</link:label>
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    <link:label id="lab_us-gaap_SiteContingencyLossExposureNotAccruedBestEstimate_0A395C5861F501AB94EAA81E28AAF26E_terseLabel_en-US" xlink:label="lab_us-gaap_SiteContingencyLossExposureNotAccruedBestEstimate_0A395C5861F501AB94EAA81E28AAF26E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected environmental cost</link:label>
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    <link:label id="lab_pnw_AssetPurchaseAgreementAdditionalPercentageShareofCostofControl_662B45FA23BCC7021CD4A81E28AA26FC_terseLabel_en-US" xlink:label="lab_pnw_AssetPurchaseAgreementAdditionalPercentageShareofCostofControl_662B45FA23BCC7021CD4A81E28AA26FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional percentage share of cost of control</link:label>
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    <link:label id="lab_pnw_AssetPurchaseAgreementAdditionalPercentageShareofCostofControl_662B45FA23BCC7021CD4A81E28AA26FC_documentation_en-US" xlink:label="lab_pnw_AssetPurchaseAgreementAdditionalPercentageShareofCostofControl_662B45FA23BCC7021CD4A81E28AA26FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Purchase Agreement, Additional Percentage Share of Cost of Control</link:label>
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    <link:label id="lab_pnw_AssetPurchaseAgreementSiteContingencyIncreaseinLossExposureNotAccruedBestEstimate_8399FE6F4FB4846C6F32A81E28AA3D09_documentation_en-US" xlink:label="lab_pnw_AssetPurchaseAgreementSiteContingencyIncreaseinLossExposureNotAccruedBestEstimate_8399FE6F4FB4846C6F32A81E28AA3D09" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Asset Purchase Agreement, Site Contingency, Increase in Loss Exposure Not Accrued, Best Estimate</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AssetPurchaseAgreementSiteContingencyIncreaseinLossExposureNotAccruedBestEstimate" xlink:label="loc_pnw_AssetPurchaseAgreementSiteContingencyIncreaseinLossExposureNotAccruedBestEstimate_8399FE6F4FB4846C6F32A81E28AA3D09" xlink:type="locator" />
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    <link:label id="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB_terseLabel_en-US" xlink:label="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Industry litigation, period to complete rulemaking proceeding</link:label>
    <link:label id="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB_label_en-US" xlink:label="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Industry Litigation, Period to Complete Rulemaking Proceeding</link:label>
    <link:label id="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB_documentation_en-US" xlink:label="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Industry Litigation, Period to Complete Rulemaking Proceeding</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding" xlink:label="loc_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:to="lab_pnw_IndustryLitigationPeriodtoCompleteRulemakingProceeding_C9DAB4B840F88A82537EA81E28ABC9EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_LitigationSettlementAmount_EB30016434890BA08A6AA81E28AB08E7_terseLabel_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmount_EB30016434890BA08A6AA81E28AB08E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation settlement awarded (against), amount</link:label>
    <link:label id="lab_us-gaap_LitigationSettlementAmount_EB30016434890BA08A6AA81E28AB08E7_label_en-US" xlink:label="lab_us-gaap_LitigationSettlementAmount_EB30016434890BA08A6AA81E28AB08E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Litigation Settlement, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LitigationSettlementAmount" xlink:label="loc_us-gaap_LitigationSettlementAmount_EB30016434890BA08A6AA81E28AB08E7" xlink:type="locator" />
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    <link:label id="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD_terseLabel_en-US" xlink:label="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial Assurances</link:label>
    <link:label id="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD_label_en-US" xlink:label="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Financial Assurances [Abstract]</link:label>
    <link:label id="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD_documentation_en-US" xlink:label="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="pnw-20170331.xsd#pnw_FinancialAssurancesAbstract" xlink:label="loc_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:to="lab_pnw_FinancialAssurancesAbstract_64EA776272CDDFF35E14A81E28ABCEFD" xlink:type="arc" />
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7_terseLabel_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding letters of credit</link:label>
    <link:label id="lab_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7_label_en-US" xlink:label="lab_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Letters of Credit Outstanding, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7" xlink:to="lab_us-gaap_LettersOfCreditOutstandingAmount_E59FEE06A843D9E55B76A81E28AB1DC7" xlink:type="arc" />
    <link:label id="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3_terseLabel_en-US" xlink:label="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Surety bonds expiring, amount</link:label>
    <link:label id="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3_label_en-US" xlink:label="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Surety Bonds Expiring, Amount</link:label>
    <link:label id="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3_documentation_en-US" xlink:label="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Surety Bonds Expiring, Amount</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SuretyBondsExpiringAmount" xlink:label="loc_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:to="lab_pnw_SuretyBondsExpiringAmount_D6646DBE6743956EF365A81E28AB2FD3" xlink:type="arc" />
    <link:label id="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2_terseLabel_en-US" xlink:label="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of parental guarantees</link:label>
    <link:label id="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2_label_en-US" xlink:label="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Guarantor Obligations, Number of Parental Guarantees</link:label>
    <link:label id="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2_documentation_en-US" xlink:label="lab_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Guarantor Obligations, Number of Parental Guarantees</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_GuarantorObligationsNumberofParentalGuarantees" xlink:label="loc_pnw_GuarantorObligationsNumberofParentalGuarantees_6747B044CAD6CB8489F4A81E28ABA8B2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PublicUtilitiesGeneralDisclosuresTable_BFFED8625AF494928240AD8620EB9115_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesGeneralDisclosuresTable_BFFED8625AF494928240AD8620EB9115" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public Utilities General Disclosures [Table]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PublicUtilitiesGeneralDisclosuresTable" xlink:label="loc_us-gaap_PublicUtilitiesGeneralDisclosuresTable_BFFED8625AF494928240AD8620EB9115" xlink:type="locator" />
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    <link:label id="lab_pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis_71FBD83321FEA6C95AA5AD8620EBDAF0_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis_71FBD83321FEA6C95AA5AD8620EBDAF0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information by various regulatory matters.</link:label>
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    <link:label id="lab_pnw_PublicUtilitiesRegulatoryRegulatoryMattersDomain_58D40FDF37D18FE55E29AD8620EBD6F9_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesRegulatoryRegulatoryMattersDomain_58D40FDF37D18FE55E29AD8620EBD6F9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents various regulatory matters.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesRegulatoryRegulatoryMattersDomain" xlink:label="loc_pnw_PublicUtilitiesRegulatoryRegulatoryMattersDomain_58D40FDF37D18FE55E29AD8620EBD6F9" xlink:type="locator" />
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    <link:label id="lab_pnw_CostRecoveryMechanismsMember_41074EFA62019BDACE2BAD8620ECE9DB_documentation_en-US" xlink:label="lab_pnw_CostRecoveryMechanismsMember_41074EFA62019BDACE2BAD8620ECE9DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the cost recovery mechanisms.</link:label>
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    <link:label id="lab_us-gaap_RegulatoryAgencyAxis_90EC5563FE959A88D674AD8620EC757D_label_en-US" xlink:label="lab_us-gaap_RegulatoryAgencyAxis_90EC5563FE959A88D674AD8620EC757D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Agency [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RegulatoryAgencyAxis" xlink:label="loc_us-gaap_RegulatoryAgencyAxis_90EC5563FE959A88D674AD8620EC757D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryAgencyAxis_90EC5563FE959A88D674AD8620EC757D" xlink:to="lab_us-gaap_RegulatoryAgencyAxis_90EC5563FE959A88D674AD8620EC757D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Regulatory Agency [Domain]</link:label>
    <link:label id="lab_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D_label_en-US" xlink:label="lab_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Regulatory Agency [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RegulatoryAgencyDomain" xlink:label="loc_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D" xlink:to="lab_us-gaap_RegulatoryAgencyDomain_E017A0B2160867F891A9AD8620EC028D" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957_terseLabel_en-US" xlink:label="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">ACC</link:label>
    <link:label id="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957_label_en-US" xlink:label="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arizona Corporation Commission [Member]</link:label>
    <link:label id="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957_documentation_en-US" xlink:label="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the Arizona Corporation Commission (ACC), which regulates public utilities in Arizona.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaCorporationCommissionMember" xlink:label="loc_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:to="lab_pnw_ArizonaCorporationCommissionMember_6697CA04C47D29ED5A61AD8620EC1957" xlink:type="arc" />
    <link:label id="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520_terseLabel_en-US" xlink:label="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">United States Federal Energy Regulatory Commission</link:label>
    <link:label id="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520_label_en-US" xlink:label="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">United States Federal Energy Regulatory Commission [Member]</link:label>
    <link:label id="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520_documentation_en-US" xlink:label="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the Federal Energy Regulatory Commission (FERC).</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember" xlink:label="loc_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:to="lab_pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember_F71A748521C801658C76AD8620ECA520" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public Utilities, Regulatory Proceeding [Axis]</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Regulatory Proceeding [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PublicUtilitiesRegulatoryProceedingAxis" xlink:label="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206" xlink:to="lab_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_531D6B0C650D6B19B037AD8620EC2206" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public Utilities, Regulatory Proceeding [Domain]</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Regulatory Proceeding [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PublicUtilitiesRegulatoryProceedingDomain" xlink:label="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48" xlink:to="lab_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_D1D5542B3893AFF88D25AD8620EC7E48" xlink:type="arc" />
    <link:label id="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2_terseLabel_en-US" xlink:label="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Retail Rate Case Filing with Arizona Corporation Commission</link:label>
    <link:label id="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2_label_en-US" xlink:label="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retail Rate Case Filing with Arizona Corporation Commission [Member]</link:label>
    <link:label id="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2_documentation_en-US" xlink:label="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents a Retail Rate case filing with the Arizona Corporation Commission</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember" xlink:label="loc_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:to="lab_pnw_RetailRateCaseFilingwithArizonaCorporationCommissionMember_ADBBA37BE01CEA1D71ACAD8620EC25F2" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7_terseLabel_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RES</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7_label_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff [Member]</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7_documentation_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the RES program which permits a surcharge as part of customer bills to recover approved amounts for use in renewable energy projects.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaRenewableEnergyStandardAndTariffMember" xlink:label="loc_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:to="lab_pnw_ArizonaRenewableEnergyStandardAndTariffMember_D9F7965E37E12D4E288FAD8620ECDAA7" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62_terseLabel_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RES 2014</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62_label_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff 2014 [Member]</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62_documentation_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the RES program, which permits a surcharge for 2014 as a part of customer bills to recover approved amounts for use in renewable energy projects.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaRenewableEnergyStandardAndTariff2014Member" xlink:label="loc_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:to="lab_pnw_ArizonaRenewableEnergyStandardAndTariff2014Member_E92B6833BC309C3ECD12AD8620EC0D62" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B_terseLabel_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RES 2016</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B_label_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff 2016 [Member]</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B_documentation_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff 2016 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaRenewableEnergyStandardandTariff2016Member" xlink:label="loc_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:to="lab_pnw_ArizonaRenewableEnergyStandardandTariff2016Member_40871B1BB9487625E93CAD8620ECD60B" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3_terseLabel_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">RES 2017</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3_label_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff 2017 [Member]</link:label>
    <link:label id="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3_documentation_en-US" xlink:label="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Arizona Renewable Energy Standard and Tariff 2017 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaRenewableEnergyStandardandTariff2017Member" xlink:label="loc_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:to="lab_pnw_ArizonaRenewableEnergyStandardandTariff2017Member_0A5771F6EC984B5479CBAD8620EC9EC3" xlink:type="arc" />
    <link:label id="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3_terseLabel_en-US" xlink:label="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Modernization and Expansion of the Renewal Energy Standard</link:label>
    <link:label id="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3_label_en-US" xlink:label="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Modernization and Expansion of the Renewal Energy Standard [Member]</link:label>
    <link:label id="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3_documentation_en-US" xlink:label="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Modernization and Expansion of the Renewal Energy Standard [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember" xlink:label="loc_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:to="lab_pnw_ModernizationandExpansionoftheRenewalEnergyStandardMember_437E5390CE1E51A4A56DAD8620ECC3D3" xlink:type="arc" />
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38_terseLabel_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DSMAC 2015</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38_label_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2015 [Member]</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38_documentation_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2015 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DemandSideManagementAdjustorCharge2015Member" xlink:label="loc_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:to="lab_pnw_DemandSideManagementAdjustorCharge2015Member_16C7741584F105D09CD5AD8620ECEE38" xlink:type="arc" />
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275_terseLabel_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DSMC 2016</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275_label_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2016 [Member]</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275_documentation_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2016 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DemandSideManagementAdjustorCharge2016Member" xlink:label="loc_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:to="lab_pnw_DemandSideManagementAdjustorCharge2016Member_A8B886EB541085ED723BAD8620ECE275" xlink:type="arc" />
    <link:label id="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6_terseLabel_en-US" xlink:label="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Electric energy efficiency standard</link:label>
    <link:label id="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6_label_en-US" xlink:label="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Electric Energy Efficiency Standard [Member]</link:label>
    <link:label id="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6_documentation_en-US" xlink:label="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Electric Energy Efficiency Standard [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ElectricEnergyEfficiencyStandardMember" xlink:label="loc_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:to="lab_pnw_ElectricEnergyEfficiencyStandardMember_F0D2936BC056C39CE254AD8620EC43C6" xlink:type="arc" />
    <link:label id="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93_terseLabel_en-US" xlink:label="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Power Supply Adjustor (PSA)</link:label>
    <link:label id="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93_label_en-US" xlink:label="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Power Supply Adjustor [Member]</link:label>
    <link:label id="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93_documentation_en-US" xlink:label="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the Power Supply Adjustment Plan which permits a surcharge for variations in retail fuel and purchased power costs.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PowerSupplyAdjustorMember" xlink:label="loc_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:to="lab_pnw_PowerSupplyAdjustorMember_40A14BAF4DABF78FA2F3AD8620ECBC93" xlink:type="arc" />
    <link:label id="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12_terseLabel_en-US" xlink:label="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Open Access Transmission Tariff</link:label>
    <link:label id="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12_label_en-US" xlink:label="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Open Access Transmission Tariff [Member]</link:label>
    <link:label id="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12_documentation_en-US" xlink:label="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the formula rate-setting methodology to reflect and recover costs incurred in providing transmission services.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_OpenAccessTransmissionTariffMember" xlink:label="loc_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:to="lab_pnw_OpenAccessTransmissionTariffMember_0D2FFCDBD92CDDD74DCAAD8620EC9F12" xlink:type="arc" />
    <link:label id="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A_terseLabel_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lost Fixed Cost Recovery Mechanisms</link:label>
    <link:label id="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A_label_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lost Fixed Cost Recovery Mechanisms [Member]</link:label>
    <link:label id="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A_documentation_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents lost fixed cost recovery mechanism.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_LostFixedCostRecoveryMechanismsMember" xlink:label="loc_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:to="lab_pnw_LostFixedCostRecoveryMechanismsMember_DCFC61B1AEC3DD116AF1AD8620ECBD1A" xlink:type="arc" />
    <link:label id="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC_terseLabel_en-US" xlink:label="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Metering</link:label>
    <link:label id="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC_label_en-US" xlink:label="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Metering [Member]</link:label>
    <link:label id="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC_documentation_en-US" xlink:label="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the proposed solution to the ACC to fix the cost shift brought by current net metering rules.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_NetMeteringMember" xlink:label="loc_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:to="lab_pnw_NetMeteringMember_79BF558F7708CD01767BAD8620EC60EC" xlink:type="arc" />
    <link:label id="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC_terseLabel_en-US" xlink:label="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Residential Demand Response, Energy Storage and Load Management Program</link:label>
    <link:label id="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC_label_en-US" xlink:label="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Residential Demand Response, Energy Storage and Load Management Program [Member]</link:label>
    <link:label id="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC_documentation_en-US" xlink:label="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Residential Demand Response, Energy Storage and Load Management Program [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember" xlink:label="loc_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:to="lab_pnw_ResidentialDemandResponseEnergyStorageandLoadManagementProgramMember_2016F6E40722107301E0AD8620ED45CC" xlink:type="arc" />
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9_terseLabel_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2017</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9_label_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2017 [Member]</link:label>
    <link:label id="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9_documentation_en-US" xlink:label="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Demand Side Management Adjustor Charge 2017 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DemandSideManagementAdjustorCharge2017Member" xlink:label="loc_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:to="lab_pnw_DemandSideManagementAdjustorCharge2017Member_1FF674E00C4A513D350CAD8620EDDBA9" xlink:type="arc" />
    <link:label id="lab_pnw_ArizonaPublicServiceCompanyMember_763ABAA05B222D7F16B5AD8620ED4438_verboseLabel_en-US" xlink:label="lab_pnw_ArizonaPublicServiceCompanyMember_763ABAA05B222D7F16B5AD8620ED4438" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">APS</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ArizonaPublicServiceCompanyMember" xlink:label="loc_pnw_ArizonaPublicServiceCompanyMember_763ABAA05B222D7F16B5AD8620ED4438" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ArizonaPublicServiceCompanyMember_763ABAA05B222D7F16B5AD8620ED4438" xlink:to="lab_pnw_ArizonaPublicServiceCompanyMember_763ABAA05B222D7F16B5AD8620ED4438" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public Utility, Program [Axis]</link:label>
    <link:label id="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3_label_en-US" xlink:label="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utility, Program [Axis]</link:label>
    <link:label id="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3_documentation_en-US" xlink:label="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utility, Program [Axis]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilityProgramAxis" xlink:label="loc_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:to="lab_pnw_PublicUtilityProgramAxis_FBD9888689CDB1D7FB1AAD8620ED43B3" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public Utility, Program [Domain]</link:label>
    <link:label id="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342_label_en-US" xlink:label="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utility, Program [Domain]</link:label>
    <link:label id="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342_documentation_en-US" xlink:label="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">[Domain] for Public Utility, Program [Axis]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilityProgramDomain" xlink:label="loc_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:to="lab_pnw_PublicUtilityProgramDomain_26EA38E3D7A778B0DECDAD8620EDC342" xlink:type="arc" />
    <link:label id="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308_terseLabel_en-US" xlink:label="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AZ Sun Program Phase 2</link:label>
    <link:label id="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308_label_en-US" xlink:label="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AZ Sun Program Phase 2 [Member]</link:label>
    <link:label id="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308_documentation_en-US" xlink:label="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AZ Sun Program Phase 2 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AZSunProgramPhase2Member" xlink:label="loc_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:to="lab_pnw_AZSunProgramPhase2Member_8B227D84F096F0F2E214AD8620ED2308" xlink:type="arc" />
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0_terseLabel_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program, Phase 1</link:label>
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0_label_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program, Phase 1 [Member]</link:label>
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0_documentation_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program, Phase 1 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AlternativetoAZSunProgramPhase1Member" xlink:label="loc_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:to="lab_pnw_AlternativetoAZSunProgramPhase1Member_B87D3CAB955497D53DA2AD8620EDAFB0" xlink:type="arc" />
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C_terseLabel_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program Phase 2</link:label>
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C_label_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program Phase 2 [Member]</link:label>
    <link:label id="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C_documentation_en-US" xlink:label="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alternative to AZ Sun Program Phase 2 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AlternativetoAZSunProgramPhase2Member" xlink:label="loc_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:to="lab_pnw_AlternativetoAZSunProgramPhase2Member_619BF025D670328DCB51AD8620EDCE6C" xlink:type="arc" />
    <link:label id="lab_us-gaap_RegulatoryAssetAxis_3F5E9624595491F3AB21AD8620EDDA29_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryAssetAxis_3F5E9624595491F3AB21AD8620EDDA29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Regulatory Asset [Axis]</link:label>
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    <link:label id="lab_us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage_292F62EFA395718EFC5CAD8620EEA26B_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage_292F62EFA395718EFC5CAD8620EEA26B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Authorized return on common equity (as a percent)</link:label>
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    <link:label id="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Public utilities, maximum annual renewable energy standard and tariff</link:label>
    <link:label id="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F_label_en-US" xlink:label="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Maximum Annual Renewable Energy Standard and Tariff</link:label>
    <link:label id="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Maximum Annual Renewable Energy Standard and Tariff</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff" xlink:label="loc_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:to="lab_pnw_PublicUtilitiesMaximumAnnualRenewableEnergyStandardandTariff_76BA5FD01D7FB60FEEA6AD8620EEFB9F" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51_terseLabel_en-US" xlink:label="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rate matter, environmental surcharge cap rate (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51_label_en-US" xlink:label="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Environmental Surcharge Cap Rate</link:label>
    <link:label id="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51_documentation_en-US" xlink:label="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matter, Environmental Surcharge Cap Rate</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterEnvironmentalSurchargeCapRate" xlink:label="loc_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:to="lab_pnw_RateMatterEnvironmentalSurchargeCapRate_1522C78F37EDCF0A4E9AAD8620EEEB51" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71_terseLabel_en-US" xlink:label="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rate matter, resource comparison proxy for exported energy (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71_label_en-US" xlink:label="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Resource Comparison Proxy for Exported Energy</link:label>
    <link:label id="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71_documentation_en-US" xlink:label="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matter, Resource Comparison Proxy for Exported Energy</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterResourceComparisonProxyforExportedEnergy" xlink:label="loc_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:to="lab_pnw_RateMatterResourceComparisonProxyforExportedEnergy_A6680A40CDBB3FB32AA0AD8620EE7A71" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net retail rate increase</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Requested Rate Increase (Decrease), Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount" xlink:label="loc_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB" xlink:to="lab_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_028A6042CCAE593CEBC3AD8620EE82DB" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB_terseLabel_en-US" xlink:label="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Approximate percentage of increase in average retail customer bill</link:label>
    <link:label id="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB_label_en-US" xlink:label="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Approximate Percentage of Increase in Average Retail Customer Bill</link:label>
    <link:label id="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB_documentation_en-US" xlink:label="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Approximate percentage of increase in the average retail customer bill due to request for net retail base rate increase.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill" xlink:label="loc_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:to="lab_pnw_RateMatterApproximatePercentageOfIncreaseInAverageRetailCustomerBill_730844ED8D7AAE7F3648AD8620EEF5EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in base rates</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Approved Rate Increase (Decrease), Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount" xlink:label="loc_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122" xlink:to="lab_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_24A24A748872C286B236AD8620EEC122" xlink:type="arc" />
    <link:label id="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89_terseLabel_en-US" xlink:label="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-fuel base rate increase</link:label>
    <link:label id="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89_label_en-US" xlink:label="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Settlement Agreement, Non Fuel Base Rate, Increase</link:label>
    <link:label id="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89_documentation_en-US" xlink:label="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of increase in non-fuel base rates as per the terms of the settlement agreement of a regulatory matter.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SettlementAgreementNonFuelBaseRateIncrease" xlink:label="loc_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:to="lab_pnw_SettlementAgreementNonFuelBaseRateIncrease_8EFD0DD9E8D6DEF06C2EAD8620EEFD89" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E_terseLabel_en-US" xlink:label="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current base fuel rate (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E_label_en-US" xlink:label="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Base Fuel Rate Current</link:label>
    <link:label id="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E_documentation_en-US" xlink:label="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the current base rate for fuel and purchased power costs.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterBaseFuelRateCurrent" xlink:label="loc_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:to="lab_pnw_RateMatterBaseFuelRateCurrent_A92B10C51ED95D9B7C0EAD8620EEB13E" xlink:type="arc" />
    <link:label id="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178_terseLabel_en-US" xlink:label="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Approved base fuel rate (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178_label_en-US" xlink:label="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Settlement Agreement Base Fuel Rate Proposed</link:label>
    <link:label id="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178_documentation_en-US" xlink:label="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the base rate for fuel and purchased power costs as per the terms of the settlement agreement of a regulatory matter.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SettlementAgreementBaseFuelRateProposed" xlink:label="loc_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:to="lab_pnw_SettlementAgreementBaseFuelRateProposed_080E5CD088E0E6F3282CAD8620EE2178" xlink:type="arc" />
    <link:label id="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA_terseLabel_en-US" xlink:label="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Estimated amount of transfer of cost recovery for certain renewable energy projects from the RES surcharge to base rates</link:label>
    <link:label id="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA_label_en-US" xlink:label="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Settlement Agreement Transfer of Cost Recovery to Base Rates</link:label>
    <link:label id="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA_documentation_en-US" xlink:label="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Estimated amount of transfer of cost recovery for certain renewable energy projects from the RES surcharge to base rates as per the terms of the settlement agreement of a regulatory matter.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates" xlink:label="loc_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:to="lab_pnw_SettlementAgreementTransferOfCostRecoveryToBaseRates_084706A283E04C97A38BAD8620EEAEDA" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E_terseLabel_en-US" xlink:label="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan term</link:label>
    <link:label id="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E_label_en-US" xlink:label="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Plan Term</link:label>
    <link:label id="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E_documentation_en-US" xlink:label="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The period of time covered by a plan to implement a standard enacted by a regulatory authority.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterPlanTerm" xlink:label="loc_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:to="lab_pnw_RateMatterPlanTerm_06DB14C531149A49C52BAD8620EE765E" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Request to build additional utility scale solar, capacity</link:label>
    <link:label id="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C_label_en-US" xlink:label="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Request to Build Additional Utility Scale Solar, Capacity</link:label>
    <link:label id="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Request to Build Additional Utility Scale Solar, Capacity</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity" xlink:label="loc_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:to="lab_pnw_PublicUtilitiesRequesttoBuildAdditionalUtilityScaleSolarCapacity_2B6264344796BCB70BFEAD8620EEEC9C" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of energy storage systems</link:label>
    <link:label id="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253_label_en-US" xlink:label="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Number of Energy Storage Systems</link:label>
    <link:label id="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Number of Energy Storage Systems</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesNumberofEnergyStorageSystems" xlink:label="loc_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:to="lab_pnw_PublicUtilitiesNumberofEnergyStorageSystems_86E43805A94241863526AD8620EEE253" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of high solar penetration feeders</link:label>
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    <link:label id="lab_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Number of High Solar Penetration Feeders</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders" xlink:label="loc_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A" xlink:to="lab_pnw_PublicUtilitiesNumberofHighSolarPenetrationFeeders_80B18AC80CE93907C19DAD8620EE256A" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4_terseLabel_en-US" xlink:label="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of approved budget</link:label>
    <link:label id="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4_label_en-US" xlink:label="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Approved Budget</link:label>
    <link:label id="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4_documentation_en-US" xlink:label="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of approved budget.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterApprovedBudget" xlink:label="loc_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:to="lab_pnw_RateMatterApprovedBudget_D9710B8FEC0ED6616153AD8620EE49E4" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D_terseLabel_en-US" xlink:label="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of proposed budget</link:label>
    <link:label id="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D_label_en-US" xlink:label="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Proposed Budget</link:label>
    <link:label id="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D_documentation_en-US" xlink:label="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of proposed budget.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterProposedBudget" xlink:label="loc_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:to="lab_pnw_RateMatterProposedBudget_ED98EEF99DFF4CBF374CAD8620EE507D" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proposed renewal energy standard, percent of retail sales</link:label>
    <link:label id="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58_label_en-US" xlink:label="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Proposed Renewal Energy Standard, Percent of Retail Sales</link:label>
    <link:label id="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Proposed Renewal Energy Standard, Percent of Retail Sales</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales" xlink:label="loc_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:to="lab_pnw_PublicUtilitiesProposedRenewalEnergyStandardPercentofRetailSales_103A705228F1A0A6D844AD8620EF3F58" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current renewal energy standard, percent of retail sales</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647_label_en-US" xlink:label="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Current Renewal Energy Standard, Percent of Retail Sales</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Current Renewal Energy Standard, Percent of Retail Sales</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales" xlink:label="loc_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:to="lab_pnw_PublicUtilitiesCurrentRenewalEnergyStandardPercentofRetailSales_1D5548F2F634087C4D98AD8620EF0647" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2_terseLabel_en-US" xlink:label="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of resource savings projects</link:label>
    <link:label id="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2_label_en-US" xlink:label="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Number of Resource Savings Projects</link:label>
    <link:label id="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2_documentation_en-US" xlink:label="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matter, Number of Resource Savings Projects</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterNumberofResourceSavingsProjects" xlink:label="loc_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:to="lab_pnw_RateMatterNumberofResourceSavingsProjects_FAB87BE017F996C145DAAD8620EF42F2" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1_terseLabel_en-US" xlink:label="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional budget approved</link:label>
    <link:label id="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1_label_en-US" xlink:label="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Additional Budget Approved</link:label>
    <link:label id="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1_documentation_en-US" xlink:label="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matter, Additional Budget Approved</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterAdditionalBudgetApproved" xlink:label="loc_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:to="lab_pnw_RateMatterAdditionalBudgetApproved_B1CF17612B31F73BA6DFAD8620EF8DB1" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of workshops</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856_label_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Cost Effective Energy Efficiency Programs, Number of Workshops</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Cost Effective Energy Efficiency Programs, Number of Workshops</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops" xlink:label="loc_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:to="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofWorkshops_6FABAB8230299C4596B5AD8620EFC856" xlink:type="arc" />
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of days to convene a workshop</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6_label_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Cost Effective Energy Efficiency Programs, Number of Days to Convene a Workshop</link:label>
    <link:label id="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6_documentation_en-US" xlink:label="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Public Utilities, Cost Effective Energy Efficiency Programs, Number of Days to Convene a Workshop</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop" xlink:label="loc_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:to="lab_pnw_PublicUtilitiesCostEffectiveEnergyEfficiencyProgramsNumberofDaystoConveneaWorkshop_8BFDC90AAC062C9CBB8BAD8620EFD1E6" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1_terseLabel_en-US" xlink:label="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in regulatory asset</link:label>
    <link:label id="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1_label_en-US" xlink:label="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Fuel and Purchased Power Regulatory Asset (Liability) [Roll Forward]</link:label>
    <link:label id="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1_documentation_en-US" xlink:label="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward" xlink:label="loc_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:to="lab_pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetLiabilityRollForward_02FF8837CCA909CF34C9AD8620EFE0A1" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_1F09F7033F5C0895816EAD8620EF830F_periodStartLabel_en-US" xlink:label="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_1F09F7033F5C0895816EAD8620EF830F" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning balance</link:label>
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    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent" xlink:label="loc_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_1F09F7033F5C0895816EAD8620EF830F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_1F09F7033F5C0895816EAD8620EF830F" xlink:to="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_1F09F7033F5C0895816EAD8620EF830F" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Deferred fuel and purchased power costs &#8212; current period</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Regulatory Clause Revenue</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14" xlink:to="lab_us-gaap_IncreaseDecreaseInRegulatoryClauseRevenue_CDCA3055DE0750CC74FCAD8620EFEF14" xlink:type="arc" />
    <link:label id="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C_negatedLabel_en-US" xlink:label="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Amounts charged to customers</link:label>
    <link:label id="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C_label_en-US" xlink:label="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) Deferred Fuel and Purchased Power Amortization</link:label>
    <link:label id="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C_documentation_en-US" xlink:label="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amortization of deferred fuel and purchased power costs.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization" xlink:label="loc_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:to="lab_pnw_IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization_5A1EDA2D40AB89262E14AD8620EF683C" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_600B49F8FA3B3F87192FAD8620EF53AA_periodEndLabel_en-US" xlink:label="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_600B49F8FA3B3F87192FAD8620EF53AA" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending balance</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent" xlink:label="loc_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_600B49F8FA3B3F87192FAD8620EF53AA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_600B49F8FA3B3F87192FAD8620EF53AA" xlink:to="lab_pnw_DeferredFuelandPurchasedPowerRegulatoryAssetLiabilityCurrent_600B49F8FA3B3F87192FAD8620EF53AA" xlink:type="arc" />
    <link:label id="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C_terseLabel_en-US" xlink:label="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSA rate (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C_label_en-US" xlink:label="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSA Rate</link:label>
    <link:label id="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C_documentation_en-US" xlink:label="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the PSA rate (power supply adjustor) which provides for the adjustment of retail rates to reflect variations in retail fuel and purchased power costs.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PSARate" xlink:label="loc_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:to="lab_pnw_PSARate_6FB9DACB8BA956719C19AD8620EFD50C" xlink:type="arc" />
    <link:label id="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31_terseLabel_en-US" xlink:label="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">PSA rate for prior year (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31_label_en-US" xlink:label="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">PSA Rate in Prior Years</link:label>
    <link:label id="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31_documentation_en-US" xlink:label="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the PSA rate prior for the prior years (power supply adjustor) which provides for the adjustment of retail rates to reflect variations in retail fuel and purchased power costs.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PSARateInPriorYears" xlink:label="loc_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:to="lab_pnw_PSARateInPriorYears_F665A5DF2642A984FCB7AD8620EFEC31" xlink:type="arc" />
    <link:label id="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8_terseLabel_en-US" xlink:label="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forward component of increase in PSA (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8_label_en-US" xlink:label="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Forward Component of PSA Rate</link:label>
    <link:label id="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8_documentation_en-US" xlink:label="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the forward component of increase in PSA.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_ForwardComponentOfPSARate" xlink:label="loc_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:to="lab_pnw_ForwardComponentOfPSARate_6601A775CC81C38645D2AD8620EFCAD8" xlink:type="arc" />
    <link:label id="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E_terseLabel_en-US" xlink:label="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Historical component of increase in PSA (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E_label_en-US" xlink:label="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Historical Component of PSA Rate</link:label>
    <link:label id="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E_documentation_en-US" xlink:label="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the historical component of increase in PSA.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_HistoricalComponentOfPSARate" xlink:label="loc_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:to="lab_pnw_HistoricalComponentOfPSARate_977F172B438CD7E794C8AD8620EF053E" xlink:type="arc" />
    <link:label id="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB_terseLabel_en-US" xlink:label="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Decrease in annual wholesale transmission rates</link:label>
    <link:label id="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB_label_en-US" xlink:label="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matters, Decrease in Cost Recovery</link:label>
    <link:label id="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB_documentation_en-US" xlink:label="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matters, Decrease in Cost Recovery</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMattersDecreaseinCostRecovery" xlink:label="loc_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:to="lab_pnw_RateMattersDecreaseinCostRecovery_D975CE26ED268EDD3225AD9B9F4DE5BB" xlink:type="arc" />
    <link:label id="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78_terseLabel_en-US" xlink:label="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase in annual wholesale transmission rates</link:label>
    <link:label id="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78_label_en-US" xlink:label="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matters, Increase in Cost Recovery</link:label>
    <link:label id="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78_documentation_en-US" xlink:label="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Rate Matters, Increase in Cost Recovery</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMattersIncreaseinCostRecovery" xlink:label="loc_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:to="lab_pnw_RateMattersIncreaseinCostRecovery_669CD803CE85FFFA2146AD8620EF0E78" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E_terseLabel_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed costs recoverable per residential power lost (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E_label_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Fixed Cost Recoverable Per Residential Power Lost</link:label>
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E_documentation_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fixed costs recovered by the LFCR mechanism per residential kWh lost.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost" xlink:label="loc_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:to="lab_pnw_RateMatterFixedCostRecoverablePerResidentialPowerLost_06E205DC85432E18C236AD8620EF7B7E" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C_terseLabel_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed costs recoverable per non-residential power lost (in dollars per kWh)</link:label>
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C_label_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter, Fixed Cost Recoverable Per Non Residential Power Lost</link:label>
    <link:label id="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C_documentation_en-US" xlink:label="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents fixed costs recovered by the LFCR mechanism per non-residential kWh lost.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost" xlink:label="loc_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:to="lab_pnw_RateMatterFixedCostRecoverablePerNonResidentialPowerLost_E477ED34E6FC35B43F12AD8620EF3A2C" xlink:type="arc" />
    <link:label id="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF_terseLabel_en-US" xlink:label="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of retail revenues</link:label>
    <link:label id="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF_label_en-US" xlink:label="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Rate Matter Cap Percentage of Retail Revenue</link:label>
    <link:label id="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF_documentation_en-US" xlink:label="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to cap percentage of retail revenues.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RateMatterCapPercentageOfRetailRevenue" xlink:label="loc_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:to="lab_pnw_RateMatterCapPercentageOfRetailRevenue_988C29B6E7D0A08E1265AD8620EF5FBF" xlink:type="arc" />
    <link:label id="lab_pnw_AmountofAdjustmentRepresentingProratedSalesLossesApproved_153665E984E4E4AAFF76AD8620EF06FE_terseLabel_en-US" xlink:label="lab_pnw_AmountofAdjustmentRepresentingProratedSalesLossesApproved_153665E984E4E4AAFF76AD8620EF06FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of adjustment representing prorated sales losses approval</link:label>
    <link:label id="lab_pnw_AmountofAdjustmentRepresentingProratedSalesLossesApproved_153665E984E4E4AAFF76AD8620EF06FE_label_en-US" xlink:label="lab_pnw_AmountofAdjustmentRepresentingProratedSalesLossesApproved_153665E984E4E4AAFF76AD8620EF06FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amount of Adjustment Representing Prorated Sales Losses Approved</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredFuelAndPurchasedPowerMTMCostsMember_01F050AB103DAB9663FC8E4914DCFC4A" xlink:to="lab_pnw_DeferredFuelAndPurchasedPowerMTMCostsMember_01F050AB103DAB9663FC8E4914DCFC4A" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199_verboseLabel_en-US" xlink:label="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Deferred fuel and purchased power (b) (e)</link:label>
    <link:label id="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199_label_en-US" xlink:label="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Fuel and Purchased Power [Member]</link:label>
    <link:label id="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199_documentation_en-US" xlink:label="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Deferred Fuel and Purchased Power [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredFuelandPurchasedPowerMember" xlink:label="loc_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:to="lab_pnw_DeferredFuelandPurchasedPowerMember_5BFAD49A370A719176238E4914DC7199" xlink:type="arc" />
    <link:label id="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674_terseLabel_en-US" xlink:label="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Four Corners cost deferral</link:label>
    <link:label id="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674_label_en-US" xlink:label="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Four Corners Cost Deferral [Member]</link:label>
    <link:label id="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674_documentation_en-US" xlink:label="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the regulatory asset under Four Corners cost deferral.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_FourCornersCostDeferralMember" xlink:label="loc_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:to="lab_pnw_FourCornersCostDeferralMember_9F2E933177D56A1DB47C8E4914DC5674" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentCreditMember_00B11C8CF11AC37DC7888E4914DC088B_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentCreditMember_00B11C8CF11AC37DC7888E4914DC088B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes &#8212; investment tax credit basis adjustment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentCreditMember" xlink:label="loc_us-gaap_InvestmentCreditMember_00B11C8CF11AC37DC7888E4914DC088B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentCreditMember_00B11C8CF11AC37DC7888E4914DC088B" xlink:to="lab_us-gaap_InvestmentCreditMember_00B11C8CF11AC37DC7888E4914DC088B" xlink:type="arc" />
    <link:label id="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE_terseLabel_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lost fixed cost recovery (b)</link:label>
    <link:label id="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE_label_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lost Fixed Cost Recovery [Member]</link:label>
    <link:label id="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE_documentation_en-US" xlink:label="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the regulatory asset under lost fixed recovery mechanisms.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_LostFixedCostRecoveryMember" xlink:label="loc_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:to="lab_pnw_LostFixedCostRecoveryMember_92D42B8C2CF0FFF4BF4C8E4914DC6DAE" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18_verboseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Palo Verde VIEs (Note 5)</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Primary Beneficiary [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18" xlink:to="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_6AEC708F4CD15420B5EF8E4914DD4B18" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51_terseLabel_en-US" xlink:label="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred compensation</link:label>
    <link:label id="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51_label_en-US" xlink:label="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Compensation [Member]</link:label>
    <link:label id="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51_documentation_en-US" xlink:label="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the regulatory asset under deferred compensation arrangements.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredCompensationMember" xlink:label="loc_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:to="lab_pnw_DeferredCompensationMember_A91628D4C3717147434A8E4914DDDA51" xlink:type="arc" />
    <link:label id="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD_terseLabel_en-US" xlink:label="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred property taxes</link:label>
    <link:label id="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD_label_en-US" xlink:label="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Property Taxes [Member]</link:label>
    <link:label id="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD_documentation_en-US" xlink:label="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to deferred property taxes.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DeferredPropertyTaxesMember" xlink:label="loc_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:to="lab_pnw_DeferredPropertyTaxesMember_EB98EF79B80C50DCC87E8E4914DD3CDD" xlink:type="arc" />
    <link:label id="lab_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044_terseLabel_en-US" xlink:label="lab_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Loss on reacquired debt</link:label>
    <link:label id="lab_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044_label_en-US" xlink:label="lab_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loss on Reacquired Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LossOnReacquiredDebtMember" xlink:label="loc_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044" xlink:to="lab_us-gaap_LossOnReacquiredDebtMember_D1E3A91D165615EF65958E4914DD1044" xlink:type="arc" />
    <link:label id="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3_terseLabel_en-US" xlink:label="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Tax expense of Medicare subsidy</link:label>
    <link:label id="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3_label_en-US" xlink:label="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tax Expense of Medicare Subsidy [Member]</link:label>
    <link:label id="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3_documentation_en-US" xlink:label="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the tax expense of Medicare subsidy.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_TaxExpenseOfMedicareSubsidyMember" xlink:label="loc_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:to="lab_pnw_TaxExpenseOfMedicareSubsidyMember_D3E3564369B678DBE7EF8E4914DDF6F3" xlink:type="arc" />
    <link:label id="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1_terseLabel_en-US" xlink:label="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AG-1 deferral</link:label>
    <link:label id="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1_label_en-US" xlink:label="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AG-1 Deferral [Member]</link:label>
    <link:label id="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1_documentation_en-US" xlink:label="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">AG-1 Deferral [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AG1DeferralMember" xlink:label="loc_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:to="lab_pnw_AG1DeferralMember_F54F9A3587F5FE6E7B888E4914DDF5A1" xlink:type="arc" />
    <link:label id="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C_terseLabel_en-US" xlink:label="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mead-Phoenix transmission line CIAC</link:label>
    <link:label id="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C_label_en-US" xlink:label="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Mead-Phoenix transmission line CIAC [Member]</link:label>
    <link:label id="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C_documentation_en-US" xlink:label="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Mead-Phoenix transmission line CIAC [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_MeadPhoenixtransmissionlineCIACMember" xlink:label="loc_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:to="lab_pnw_MeadPhoenixtransmissionlineCIACMember_931415D342898B1FDCC28E4914DD661C" xlink:type="arc" />
    <link:label id="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8_terseLabel_en-US" xlink:label="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transmission cost adjustor (b)</link:label>
    <link:label id="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8_label_en-US" xlink:label="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Transmission Cost Adjustor [Member]</link:label>
    <link:label id="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8_documentation_en-US" xlink:label="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Transmission Cost Adjustor [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_TransmissionCostAdjustorMember" xlink:label="loc_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:to="lab_pnw_TransmissionCostAdjustorMember_00D6D3FA9D7349FBF49B8E4914DDD1F8" xlink:type="arc" />
    <link:label id="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557_terseLabel_en-US" xlink:label="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Coal reclamation</link:label>
    <link:label id="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557_label_en-US" xlink:label="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Coal Reclamation [Member]</link:label>
    <link:label id="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557_documentation_en-US" xlink:label="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Reclamation liability that is associated with a legal obligation for the reclamation of coal properties.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_CoalReclamationMember" xlink:label="loc_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:to="lab_pnw_CoalReclamationMember_E664687E0F52285314E38E4914DE6557" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_ACD6B5F9D20E844C46488E4914DE3BD4_terseLabel_en-US" xlink:label="lab_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_ACD6B5F9D20E844C46488E4914DE3BD4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_ACD6B5F9D20E844C46488E4914DE3BD4_label_en-US" xlink:label="lab_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_ACD6B5F9D20E844C46488E4914DE3BD4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Regulatory Assets (Liabilities) [Member]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_253C6F173FCC30C703ACA82563D9E125" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_595CDEF9BC234096BFDDA82563D9C8DE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember_C3B3F8370F8954E4F2B0A82563D919F0_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember_C3B3F8370F8954E4F2B0A82563D919F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest</link:label>
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    <link:label id="lab_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_4EAE533AA0ADAA3A3FD3A82563DA5CFA_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_4EAE533AA0ADAA3A3FD3A82563DA5CFA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_4D0573DE5A9DF685C3EE68C25C312F87" xlink:to="lab_us-gaap_DerivativeFairValueOfDerivativeLiability_4D0573DE5A9DF685C3EE68C25C312F87" xlink:type="arc" />
    <link:label id="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0_terseLabel_en-US" xlink:label="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional collateral to counterparties for energy related non-derivative instrument contracts</link:label>
    <link:label id="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0_label_en-US" xlink:label="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Non Derivative Credit Risk Contract Additional Collateral Aggregate Fair Value</link:label>
    <link:label id="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0_documentation_en-US" xlink:label="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The aggregate fair value of additional assets that would be required to be posted as collateral for non-derivative instruments with credit-risk related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue" xlink:label="loc_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:to="lab_pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue_A0CA1A212CA4F7F5129F68C25C31F9D0" xlink:type="arc" />
    <link:label id="lab_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B_label_en-US" xlink:label="lab_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Abstract]</link:label>
    <link:label id="lab_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B_documentation_en-US" xlink:label="lab_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Abstract]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_VariableInterestEntitiesAbstract" xlink:label="loc_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B" xlink:to="lab_pnw_VariableInterestEntitiesAbstract_1CEC770A1D52197BAC2A7EB8D1FE937B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Variable Interest Entities [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2_label_en-US" xlink:label="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Variable Interest Entities [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2" xlink:to="lab_us-gaap_ScheduleOfVariableInterestEntitiesTable_9D970E183366A50FB26A7EB8D1FE3CF2" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Axis]</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9" xlink:to="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_E25718C30063E071A7647EB8D1FEE9F9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F_terseLabel_en-US" xlink:label="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Classification [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F_label_en-US" xlink:label="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Classification [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F" xlink:to="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_90F177F59010A5C0C48E7EB8D1FE686F" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_8EB2C305920AFE6A100B7EB8D1FEB73D_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_8EB2C305920AFE6A100B7EB8D1FEB73D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consolidation of VIEs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_8EB2C305920AFE6A100B7EB8D1FEB73D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_8EB2C305920AFE6A100B7EB8D1FEB73D" xlink:to="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_8EB2C305920AFE6A100B7EB8D1FEB73D" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period [Axis]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period [Axis]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertinent to sale and leaseback period.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriodAxis" xlink:label="loc_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:to="lab_pnw_SaleLeasebackTransactionPeriodAxis_411D2BE9B0DF330592A77EB8D1FE3310" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period [Domain]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period [Domain]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents details pertaining to sale and leaseback period.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriodDomain" xlink:label="loc_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:to="lab_pnw_SaleLeasebackTransactionPeriodDomain_2894F62650EAC73CA61B7EB8D1FE24D9" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Through 2023</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period Through 2023 [Member]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to sale and leaseback period through 2023.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriodThrough2023Member" xlink:label="loc_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:to="lab_pnw_SaleLeasebackTransactionPeriodThrough2023Member_BCC3D56DC0E96A1057D77EB8D1FE914B" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Through 2033</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period Through 2033 [Member]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to sale and leaseback period through 2033.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriodThrough2033Member" xlink:label="loc_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:to="lab_pnw_SaleLeasebackTransactionPeriodThrough2033Member_46C5135075E702004AD37EB8D1FE359E" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period 2017 through 2023</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period 2016 Through 2023 [Member]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to sale and leaseback period 2016 through 2023.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriod2016Through2023Member" xlink:label="loc_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:to="lab_pnw_SaleLeasebackTransactionPeriod2016Through2023Member_F7287B360C116DAE00437EB8D1FE9919" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period 2024 through 2033</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Period 2024 Through 2033 [Member]</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to sale and leaseback period 2024 through 2033.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionPeriod2024Through2033Member" xlink:label="loc_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:to="lab_pnw_SaleLeasebackTransactionPeriod2024Through2033Member_3629DEC80C883CBFE74E7EB8D1FE6152" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Palo Verde Sale Leaseback Variable Interest Entities</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableInterestEntityLineItems" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A" xlink:to="lab_us-gaap_VariableInterestEntityLineItems_B364A7417684EFB49B557EB8D1FFBA3A" xlink:type="arc" />
    <link:label id="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024_terseLabel_en-US" xlink:label="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of VIE lessor trusts</link:label>
    <link:label id="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024_label_en-US" xlink:label="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of VIE Lessor Trusts</link:label>
    <link:label id="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024_documentation_en-US" xlink:label="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_NumberOfVIELessorTrusts" xlink:label="loc_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:to="lab_pnw_NumberOfVIELessorTrusts_692B9B4A8FCAA173E22F7EB8D1FF6024" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of leases under which assets are retained</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Number of Leases under which Assets Retained Through Specified Period</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of leases under which assets are retained through a specified period.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod" xlink:label="loc_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:to="lab_pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod_AB22ECB2130F477B8BB67EB8D1FF799D" xlink:type="arc" />
    <link:label id="lab_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0_terseLabel_en-US" xlink:label="lab_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual lease payments</link:label>
    <link:label id="lab_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0_label_en-US" xlink:label="lab_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction, Annual Rental Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SaleLeasebackTransactionAnnualRentalPayments" xlink:label="loc_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0" xlink:to="lab_us-gaap_SaleLeasebackTransactionAnnualRentalPayments_0BB64C7CE754776C41177EB8D1FFC0D0" xlink:type="arc" />
    <link:label id="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841_terseLabel_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease period (up to)</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841_label_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Sale Leaseback Transaction Lease Period</link:label>
    <link:label id="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841_documentation_en-US" xlink:label="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period of lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SaleLeasebackTransactionLeasePeriod" xlink:label="loc_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:to="lab_pnw_SaleLeasebackTransactionLeasePeriod_725CB5E13E546C6789707EB8D1FF2841" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36_positiveLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36" xlink:role="http://www.xbrl.org/2003/role/positiveLabel" xlink:type="resource" xml:lang="en-US">Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36" xlink:to="lab_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_15673C8BD36D2D13790C7EB8D1FFDF36" xlink:type="arc" />
    <link:label id="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10_terseLabel_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period</link:label>
    <link:label id="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10_label_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Entity Initial Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount</link:label>
    <link:label id="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10_documentation_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Entity Initial Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" xlink:label="loc_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:to="lab_pnw_VariableInterestEntityEntityInitialLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_BA7765B7546F1E79ACAD7EB8D1FF6E10" xlink:type="arc" />
    <link:label id="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD_terseLabel_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period</link:label>
    <link:label id="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD_label_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Entity Maximum Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount</link:label>
    <link:label id="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD_documentation_en-US" xlink:label="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Entity Maximum Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount" xlink:label="loc_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:to="lab_pnw_VariableInterestEntityEntityMaximumLossExposuretoNoncontrollingInterestsDuringLeaseExtensionPeriodAmount_833C7AF43C99712B8AEE7EB8D1FFEBBD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26_label_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26" xlink:to="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_71135E157CC23DA1E99E7C10FD40DB26" xlink:type="arc" />
    <link:label id="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A_terseLabel_en-US" xlink:label="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Navajo Plant</link:label>
    <link:label id="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A_label_en-US" xlink:label="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Navajo Plant [Member]</link:label>
    <link:label id="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A_documentation_en-US" xlink:label="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represent information pertaining to Navajo Plant.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_NavajoPlantMember" xlink:label="loc_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:to="lab_pnw_NavajoPlantMember_2A7E28C4BF60278804667C10FD41A50A" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E" xlink:to="lab_us-gaap_BusinessAcquisitionAxis_3C7CDF01CB140F9D7AFD7C10FD425A7E" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label id="lab_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Acquisition, Acquiree [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE" xlink:to="lab_us-gaap_BusinessAcquisitionAcquireeDomain_0A414FA7AE28A91DCEAF7C10FD42B6DE" xlink:type="arc" />
    <link:label id="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2_terseLabel_en-US" xlink:label="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SCE</link:label>
    <link:label id="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2_label_en-US" xlink:label="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Southern California Edison Company [Member]</link:label>
    <link:label id="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2_documentation_en-US" xlink:label="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information related to Southern California Edison Company.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_SouthernCaliforniaEdisonCompanyMember" xlink:label="loc_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:to="lab_pnw_SouthernCaliforniaEdisonCompanyMember_97B352A88D8D9BF1DCB37C10FD42FBF2" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessAcquisitionLineItems_C700B05996691C924D447C10FD43960B_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionLineItems_C700B05996691C924D447C10FD43960B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business Acquisition [Line Items]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_7879AD07B98D510AB52C7C18A9618CF5_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNetAbstract_7879AD07B98D510AB52C7C18A9618CF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net [Abstract]</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_4BAD8049C5D087898DC97C18A96161A6_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_4BAD8049C5D087898DC97C18A96161A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
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    <link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_D1C51406C6F983674CF07C18A961BDB4_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_D1C51406C6F983674CF07C18A961BDB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_95349DADA0F5A443BC0D7C18A9629F46_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_95349DADA0F5A443BC0D7C18A9629F46" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_95349DADA0F5A443BC0D7C18A9629F46_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_95349DADA0F5A443BC0D7C18A9629F46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_95349DADA0F5A443BC0D7C18A9629F46" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction work in progress</link:label>
    <link:label id="lab_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Construction in Progress, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC" xlink:to="lab_us-gaap_ConstructionInProgressGross_2932A536A88926555ED77C18A962B3CC" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182_verboseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Palo Verde sale leaseback, net of accumulated depreciation (Note 5)</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Consolidated, Carrying Amount, Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets" xlink:label="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182" xlink:to="lab_us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets_CA76FD7D5E652AD4AFCF7C18A9626182" xlink:type="arc" />
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Intangible assets, net of accumulated amortization</link:label>
    <link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Intangible Assets, Net (Excluding Goodwill)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41" xlink:to="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_4588DEAC6733AC63A6AB7C18A962DC41" xlink:type="arc" />
    <link:label id="lab_us-gaap_NuclearFuelNetOfAmortization_D89CB0BEBD4249B2F2F77C18A962B151_terseLabel_en-US" xlink:label="lab_us-gaap_NuclearFuelNetOfAmortization_D89CB0BEBD4249B2F2F77C18A962B151" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Nuclear fuel, net of accumulated amortization</link:label>
    <link:label id="lab_us-gaap_NuclearFuelNetOfAmortization_D89CB0BEBD4249B2F2F77C18A962B151_label_en-US" xlink:label="lab_us-gaap_NuclearFuelNetOfAmortization_D89CB0BEBD4249B2F2F77C18A962B151" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nuclear Fuel, Net of Amortization</link:label>
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    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_E352D082DA32C1F79E927C18A963ACA5_totalLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_E352D082DA32C1F79E927C18A963ACA5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total property, plant and equipment</link:label>
    <link:label id="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_E352D082DA32C1F79E927C18A963ACA5_label_en-US" xlink:label="lab_us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet_E352D082DA32C1F79E927C18A963ACA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Public Utilities, Property, Plant and Equipment, Net</link:label>
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    <link:label id="lab_us-gaap_DeferredCostsAbstract_ACAC8128A3C783A40F647C18A963D804_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCostsAbstract_ACAC8128A3C783A40F647C18A963D804" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">DEFERRED DEBITS</link:label>
    <link:label id="lab_us-gaap_DeferredCostsAbstract_ACAC8128A3C783A40F647C18A963D804_label_en-US" xlink:label="lab_us-gaap_DeferredCostsAbstract_ACAC8128A3C783A40F647C18A963D804" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Costs [Abstract]</link:label>
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    <link:label id="lab_us-gaap_RegulatoryAssetsNoncurrent_0719DA1D178A5A925C557C18A963E30F_terseLabel_en-US" xlink:label="lab_us-gaap_RegulatoryAssetsNoncurrent_0719DA1D178A5A925C557C18A963E30F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Regulatory assets (Note 3)</link:label>
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    <link:label id="lab_pnw_TotalDeferredDebits_413C5D5076EAF25EE29B7C18A9636B05_label_en-US" xlink:label="lab_pnw_TotalDeferredDebits_413C5D5076EAF25EE29B7C18A9636B05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Total Deferred Debits</link:label>
    <link:label id="lab_pnw_TotalDeferredDebits_413C5D5076EAF25EE29B7C18A9636B05_documentation_en-US" xlink:label="lab_pnw_TotalDeferredDebits_413C5D5076EAF25EE29B7C18A9636B05" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Sum of the carrying amounts as of the balance sheet date of all regulatory assets and other deferred debits that are expected to be recovered through revenue sources (or the normal operating cycle, if longer).</link:label>
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    <link:label id="lab_us-gaap_Assets_9DE85EEC21FA08FF847D7C18A96398E6_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_9DE85EEC21FA08FF847D7C18A96398E6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">TOTAL ASSETS</link:label>
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    <link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgesLiabilities_B0E84012005B2EC1496E7C18A965B098_verboseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgesLiabilities_B0E84012005B2EC1496E7C18A965B098" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Liabilities from risk management activities (Note 6)</link:label>
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    <link:label id="lab_pnw_NonoperatingIncomeTaxExpenseBenefit_5B14A9B518723847D6EA7C18A9872FAE_documentation_en-US" xlink:label="lab_pnw_NonoperatingIncomeTaxExpenseBenefit_5B14A9B518723847D6EA7C18A9872FAE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to non-operating income.</link:label>
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    <link:label id="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_B1E579AEEC6198E915CE7C18A988380F_terseLabel_en-US" xlink:label="lab_us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity_B1E579AEEC6198E915CE7C18A988380F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for equity funds used during construction</link:label>
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    <link:label id="lab_us-gaap_OtherNonoperatingIncome_1E331F5459C3F9F1DBBB7C18A9883976_terseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncome_1E331F5459C3F9F1DBBB7C18A9883976" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income (Note 8)</link:label>
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    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_07153CF09E31A96828418E4F19A18ECF_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_07153CF09E31A96828418E4F19A18ECF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_07153CF09E31A96828418E4F19A18ECF_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_07153CF09E31A96828418E4F19A18ECF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_CommonStockNoParValue_0957CFD478213891472C629791065B7D_label_en-US" xlink:label="lab_us-gaap_CommonStockNoParValue_0957CFD478213891472C629791065B7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, No Par Value</link:label>
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    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_A22DE7D8FEE2DF2A68CF629791065B55_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_A22DE7D8FEE2DF2A68CF629791065B55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares Authorized</link:label>
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    <link:label id="lab_us-gaap_TreasuryStockShares_7D02834C46A0ED16978E62979106BE76_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_7D02834C46A0ED16978E62979106BE76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Treasury Stock, Shares</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_7D02834C46A0ED16978E62979106BE76" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherIncomeDisclosureNonoperatingAbstract_FFEB240910E948352F8B6920A9FB997A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherIncomeDisclosureNonoperatingAbstract_FFEB240910E948352F8B6920A9FB997A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income:</link:label>
    <link:label id="lab_us-gaap_OtherIncomeDisclosureNonoperatingAbstract_FFEB240910E948352F8B6920A9FB997A_label_en-US" xlink:label="lab_us-gaap_OtherIncomeDisclosureNonoperatingAbstract_FFEB240910E948352F8B6920A9FB997A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Income, Nonoperating [Abstract]</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_6956805A7959DAC89DBA6920A9FBAAD0" xlink:type="locator" />
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    <link:label id="lab_pnw_GainonDispositionofPropertyPlantEquipment_C9D64887799D7B413C3F6920A9FC7A79_terseLabel_en-US" xlink:label="lab_pnw_GainonDispositionofPropertyPlantEquipment_C9D64887799D7B413C3F6920A9FC7A79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gain on disposition of property</link:label>
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    <link:loc xlink:href="pnw-20170331.xsd#pnw_GainonDispositionofPropertyPlantEquipment" xlink:label="loc_pnw_GainonDispositionofPropertyPlantEquipment_C9D64887799D7B413C3F6920A9FC7A79" xlink:type="locator" />
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    <link:label id="lab_pnw_MiscellaneousOtherNonoperatingIncome_5ADF91B3A0E955E60F8F6920A9FCB8B1_terseLabel_en-US" xlink:label="lab_pnw_MiscellaneousOtherNonoperatingIncome_5ADF91B3A0E955E60F8F6920A9FCB8B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Miscellaneous</link:label>
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    <link:label id="lab_us-gaap_OtherNonoperatingIncome_E6B004B536B4FA9852D46920A9FC3C0D_totalLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncome_E6B004B536B4FA9852D46920A9FC3C0D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total other income</link:label>
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    <link:label id="lab_pnw_RevolvingCreditFacilityMaturingAugust2017Member_87261E7A1508979F7F218E8E5BDC6126_documentation_en-US" xlink:label="lab_pnw_RevolvingCreditFacilityMaturingAugust2017Member_87261E7A1508979F7F218E8E5BDC6126" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility Maturing August 2017 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RevolvingCreditFacilityMaturingAugust2017Member" xlink:label="loc_pnw_RevolvingCreditFacilityMaturingAugust2017Member_87261E7A1508979F7F218E8E5BDC6126" xlink:type="locator" />
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    <link:label id="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC_terseLabel_en-US" xlink:label="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unsecured senior notes maturing November 2045</link:label>
    <link:label id="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC_label_en-US" xlink:label="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes 4.35 Percent Mature on 15 November, 2045 [Member]</link:label>
    <link:label id="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC_documentation_en-US" xlink:label="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Unsecured Senior Notes 4.35 Percent Mature on 15 November, 2045 [Member]</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member" xlink:label="loc_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:to="lab_pnw_UnsecuredSeniorNotes4.35PercentMatureon15November2045Member_19D1E05870E17831DD3D8E8E5BDC8DAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current borrowing capacity on credit facility</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F" xlink:to="lab_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_DB8623EE0465DA8E35D78E8E5BDDA28F" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_B58DE7B8FC9EFE7CECAD8E8E5BDDB1E5" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term line of credit</link:label>
    <link:label id="lab_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF_label_en-US" xlink:label="lab_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Line of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF" xlink:to="lab_us-gaap_LineOfCredit_A3A643774B47B5D006A48E95076D65BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial paper</link:label>
    <link:label id="lab_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21_label_en-US" xlink:label="lab_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommercialPaper" xlink:label="loc_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21" xlink:to="lab_us-gaap_CommercialPaper_612A33390BF23BD55F238E8E5BDD0D21" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, term</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4" xlink:to="lab_us-gaap_DebtInstrumentTerm_947F96F81A8906C4B7878E8E5BDD4DC4" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, basis spread on variable rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Basis Spread on Variable Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_A75F6ECF10B5ABCCCF948E8E5BDD209D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShortTermBorrowings_DB52D528A16F3CD4DE8A8E8E5BDD1C37_terseLabel_en-US" xlink:label="lab_us-gaap_ShortTermBorrowings_DB52D528A16F3CD4DE8A8E8E5BDD1C37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shot-term debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_DB52D528A16F3CD4DE8A8E8E5BDD1C37" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShortTermBorrowings_DB52D528A16F3CD4DE8A8E8E5BDD1C37" xlink:to="lab_us-gaap_ShortTermBorrowings_DB52D528A16F3CD4DE8A8E8E5BDD1C37" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt issued</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_77C512B628CFF73D0E3C8E8E5BDDF652" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument, stated interest rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F84B98FE91ECB8E1D74D8E8E5BDD6865" xlink:type="arc" />
    <link:label id="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940_terseLabel_en-US" xlink:label="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of line of credit facilities</link:label>
    <link:label id="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940_label_en-US" xlink:label="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Number of Agreements</link:label>
    <link:label id="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940_documentation_en-US" xlink:label="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of line of credit facilities.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_LineOfCreditFacilityNumberOfAgreements" xlink:label="loc_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:to="lab_pnw_LineOfCreditFacilityNumberOfAgreements_66863CBCE3131CE668BF8E8E5BDD2940" xlink:type="arc" />
    <link:label id="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38_terseLabel_en-US" xlink:label="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum commercial paper support available under credit facility</link:label>
    <link:label id="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38_label_en-US" xlink:label="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Commercial Paper Program Maximum Borrowing Capacity</link:label>
    <link:label id="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38_documentation_en-US" xlink:label="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum borrowings available for the commercial paper program under the terms of line of credit facility.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity" xlink:label="loc_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:to="lab_pnw_LineOfCreditFacilityCommercialPaperProgramMaximumBorrowingCapacity_9DDBB7C75D9F32873C578E8E5BDDEF38" xlink:type="arc" />
    <link:label id="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703_terseLabel_en-US" xlink:label="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Provisions</link:label>
    <link:label id="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703_label_en-US" xlink:label="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Provisions [Abstract]</link:label>
    <link:label id="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703_documentation_en-US" xlink:label="lab_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="pnw-20170331.xsd#pnw_DebtProvisionsAbstract" xlink:label="loc_pnw_DebtProvisionsAbstract_592D08EFCE703C15459A8E8E5BDDB703" xlink:type="locator" />
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    <link:label id="lab_pnw_PublicUtilityOrderCommonStockholdersEquityRatio_719BFBAF10858DAAD71D8E8E5BDD5074_terseLabel_en-US" xlink:label="lab_pnw_PublicUtilityOrderCommonStockholdersEquityRatio_719BFBAF10858DAAD71D8E8E5BDD5074" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Required common equity ratio ordered by ACC (as a percent) (at least)</link:label>
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    <link:label id="lab_pnw_PublicUtilityOrderDividendRestrictionsShareholderEquity_0C3343EFB0AC34B5DE078E8E5BDD7C4E_documentation_en-US" xlink:label="lab_pnw_PublicUtilityOrderDividendRestrictionsShareholderEquity_0C3343EFB0AC34B5DE078E8E5BDD7C4E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The amount of total shareholder equity required in order for the entity to pay dividends pursuant to an order from a regulatory authority.</link:label>
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    <link:label id="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_260A1401687794BC30EF0BEE10D40156_label_en-US" xlink:label="lab_us-gaap_OffsettingLiabilitiesTableTextBlock_618C679FB78B56D18DD9A1EC658FA704" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Offsetting Liabilities [Table Text Block]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_FDD7D67DE22447ED80166920A9E596AB" xlink:to="lab_us-gaap_LiabilitiesFairValueDisclosure_FDD7D67DE22447ED80166920A9E596AB" xlink:type="arc" />
    <link:label id="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57_terseLabel_en-US" xlink:label="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Electricity forward price (per MWh)</link:label>
    <link:label id="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57_label_en-US" xlink:label="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Inputs, Electricity Forward Price Per Megawatt Hours</link:label>
    <link:label id="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57_documentation_en-US" xlink:label="lab_pnw_FairValueInputsElectricityForwardPricePerMegawattHours_CE411BF54DCC4ECB8B706920A9E54A57" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the electricity forward price per Megawatt Hours, used as an input to measure fair value.</link:label>
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    <link:label id="lab_pnw_FairValueInputsGasForwardPricePerMetricMillionBritishThermalUnits_BB94DAE1AE3F19B63C556920A9E5540B_terseLabel_en-US" xlink:label="lab_pnw_FairValueInputsGasForwardPricePerMetricMillionBritishThermalUnits_BB94DAE1AE3F19B63C556920A9E5540B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Natural gas forward price (per MMbtu)</link:label>
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    <link:label id="lab_pnw_ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMember_9F17FA67CB714DA2D23068D88A2183A5_terseLabel_en-US" xlink:label="lab_pnw_ArizonaPublicServiceCompanyandPaloVerdeOwnersvs.UnitedStatesDepartmentofEnergySpentNuclearFuelandWasteDisposalMember_9F17FA67CB714DA2D23068D88A2183A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste</link:label>
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    <link:loc xlink:href="pnw-20170331.xsd#pnw_MaximumInsuranceCoveragePerIncident" xlink:label="loc_pnw_MaximumInsuranceCoveragePerIncident_E4EECE7399639A66273F68D88A21A610" xlink:type="locator" />
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    <link:label id="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8_terseLabel_en-US" xlink:label="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum available nuclear liability insurance (up to)</link:label>
    <link:label id="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8_label_en-US" xlink:label="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Available Nuclear Liability Insurance</link:label>
    <link:label id="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8_documentation_en-US" xlink:label="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum available nuclear liability insurance which is provided by commercial insurance carriers, maintained by Palo Verde as required by the Price Anderson Nuclear Industries Indemnity Act.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_MaximumAvailableNuclearLiabilityInsurance" xlink:label="loc_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:to="lab_pnw_MaximumAvailableNuclearLiabilityInsurance_FF1AAD4DF8C7CA2D7A2468D88A2127B8" xlink:type="arc" />
    <link:label id="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4_terseLabel_en-US" xlink:label="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program</link:label>
    <link:label id="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4_label_en-US" xlink:label="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Remaining Nuclear Liability Insurance Through Mandatory Industry Wide Retrospective Assessment Program</link:label>
    <link:label id="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4_documentation_en-US" xlink:label="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the remaining nuclear liability insurance that is provided through mandatory industry wide retrospective assessment program.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram" xlink:label="loc_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:to="lab_pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgram_A729F34D4724E7C6EB8E68D88A2165E4" xlink:type="arc" />
    <link:label id="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136_terseLabel_en-US" xlink:label="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum retrospective premium assessment per reactor for each nuclear liability incident</link:label>
    <link:label id="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136_label_en-US" xlink:label="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Assessment Per Reactor for Each Nuclear Incident</link:label>
    <link:label id="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136_documentation_en-US" xlink:label="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum assessment per reactor under the program for each nuclear incident.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_MaximumAssessmentPerReactorForEachNuclearIncident" xlink:label="loc_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:to="lab_pnw_MaximumAssessmentPerReactorForEachNuclearIncident_A03AA60D6B9DE43987DC68D88A21D136" xlink:type="arc" />
    <link:label id="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9_terseLabel_en-US" xlink:label="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual limit per incident with respect to maximum retrospective premium assessment</link:label>
    <link:label id="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9_label_en-US" xlink:label="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Annual Limit Per Incident with Respect to Maximum Assessment</link:label>
    <link:label id="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9_documentation_en-US" xlink:label="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the annual limit per incident with respect to the maximum assessment per reactor under the program for each nuclear incident, to be periodically adjusted for inflation.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment" xlink:label="loc_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:to="lab_pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessment_B3CB82CA8B2E95150E2568D88A2198A9" xlink:type="arc" />
    <link:label id="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153_terseLabel_en-US" xlink:label="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum potential retrospective assessment per incident of APS</link:label>
    <link:label id="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153_label_en-US" xlink:label="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Potential Retrospective Assessment Per Incident</link:label>
    <link:label id="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153_documentation_en-US" xlink:label="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum potential retrospective assessment per incident based on the interest of APS in the three Palo Verde units.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_MaximumPotentialRetrospectiveAssessmentPerIncident" xlink:label="loc_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:to="lab_pnw_MaximumPotentialRetrospectiveAssessmentPerIncident_8A9012C6A0D5E5461ACC68D88A224153" xlink:type="arc" />
    <link:label id="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04_terseLabel_en-US" xlink:label="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual payment limitation with respect to maximum potential retrospective premium assessment</link:label>
    <link:label id="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04_label_en-US" xlink:label="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Annual Payment Limitation with Respect to Maximum Potential Retrospective Assessment</link:label>
    <link:label id="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04_documentation_en-US" xlink:label="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the annual payment limitation with respect to maximum potential retrospective assessment.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment" xlink:label="loc_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:to="lab_pnw_AnnualPaymentLimitationWithRespectToMaximumPotentialRetrospectiveAssessment_8787884213E250D69F4B68D88A22DD04" xlink:type="arc" />
    <link:label id="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6_terseLabel_en-US" xlink:label="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde</link:label>
    <link:label id="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6_label_en-US" xlink:label="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">All Risk Insurance for Property Damage and Decontamination at Palo Verde</link:label>
    <link:label id="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6_documentation_en-US" xlink:label="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde of which a substantial portion must first be applied to stabilization and decontamination.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde" xlink:label="loc_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:to="lab_pnw_AllRiskInsuranceForPropertyDamageAndDecontaminationAtPaloVerde_502145132F2FA6E1764E68D88A22B6C6" xlink:type="arc" />
    <link:label id="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07_terseLabel_en-US" xlink:label="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum amount that APS could incur under the current NEIL policies for each retrospective assessment</link:label>
    <link:label id="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07_label_en-US" xlink:label="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum Amount that Could be Incurred under Retrospective Assessment of NEIL Policies</link:label>
    <link:label id="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07_documentation_en-US" xlink:label="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Maximum Amount that Could be Incurred under Retrospective Assessment of NEIL Policies</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies" xlink:label="loc_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:to="lab_pnw_MaximumAmountthatCouldbeIncurredunderRetrospectiveAssessmentofNEILPolicies_89490FBFCF3B52D37BA768D88A221E07" xlink:type="arc" />
    <link:label id="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C_terseLabel_en-US" xlink:label="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collateral assurance provided based on rating triggers</link:label>
    <link:label id="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C_label_en-US" xlink:label="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collateral Assurance Based on Rating Triggers</link:label>
    <link:label id="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C_documentation_en-US" xlink:label="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the collateral assurance provided that depends upon rating triggers such as a rating downgrade to non-investment grade under NEIL policies.</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_CollateralAssuranceBasedOnRatingTriggers" xlink:label="loc_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:to="lab_pnw_CollateralAssuranceBasedOnRatingTriggers_9A43ADF9AB32F58F597768D88A22A27C" xlink:type="arc" />
    <link:label id="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8_terseLabel_en-US" xlink:label="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period to provide collateral assurance based on rating triggers</link:label>
    <link:label id="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8_label_en-US" xlink:label="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Period to Provide Collateral Assurance Based on Rating Triggers</link:label>
    <link:label id="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8_documentation_en-US" xlink:label="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the period to provide collateral assurance based on rating triggers such as a rating downgrade to non-investment grade under NEIL policies (in days).</link:label>
    <link:loc xlink:href="pnw-20170331.xsd#pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers" xlink:label="loc_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:to="lab_pnw_PeriodToProvideCollateralAssuranceBasedOnRatingTriggers_6AF696D62B72E0BC720C68D88A22F2B8" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_5BE6C0D3AD4A96A27BCC697D103FCA6F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_5BE6C0D3AD4A96A27BCC697D103FCA6F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchase obligation, increase (decrease) as a result of variable components</link:label>
    <link:label id="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_5BE6C0D3AD4A96A27BCC697D103FCA6F_label_en-US" xlink:label="lab_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_5BE6C0D3AD4A96A27BCC697D103FCA6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unrecorded Unconditional Purchase Obligation, Change of Amount as Result of Variable Components</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationChangeOfAmountAsResultOfVariableComponents_5BE6C0D3AD4A96A27BCC697D103FCA6F" xlink:type="locator" />
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