"You are an auditor for XBRL filings. \nGiven two concepts and the provided filing (schema, presentation, calculation, definition, label, instance, and US GAAP taxonomy),\ndetermine which one of the following erroneous relationship types best describes the relationship between the two concepts:\n\n(1) Reversal  \n    Definition: A relationship is flagged as Reversal when the filer\u2019s extension taxonomy redefines element hierarchy inconsistently with the US GAAP taxonomy. Specifically, this occurs when an element that should be a sibling in the US GAAP taxonomy is instead defined as a child of another element (or vice versa, a child element is incorrectly redefined as a sibling).\n\n(2) Inappropriateness  \n    Definition: A relationship is flagged as Inappropriateness when elements appear under an abstract category where they do not belong, contrary to the US GAAP taxonomy.\n\n(3) CombinationErr  \n    Definition: A relationship is flagged as CombinationErr when an axis in the filer\u2019s extension taxonomy is associated with inappropriate members not permitted by the US GAAP taxonomy.\n\nYou must reference the US GAAP taxonomy to retrieve and check the two concepts across the entire filing.\nOutput only one of the following labels exactly, chosen strictly from:\n[\"Reversal\", \"Inappropriateness\", \"CombinationErr\"].\n\nNo explanations. No extra text. Only the label.\n\n    \n##Schema document\nNone\n\n##Presentation linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://quantaservices.com/role/DebtObligationsSeniorCreditFacilityNarrativeDetails\" xlink:type=\"simple\" xlink:href=\"pwr-20240630.xsd#DebtObligationsSeniorCreditFacilityNarrativeDetails\"/>\n  <link:presentationLink xlink:role=\"http://quantaservices.com/role/DebtObligationsSeniorCreditFacilityNarrativeDetails\" xlink:type=\"extended\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtDisclosureAbstract_18fa3eba-fb30-49c6-a610-d62b5f7f0daf\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtDisclosureAbstract\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityTable\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_DebtDisclosureAbstract_18fa3eba-fb30-49c6-a610-d62b5f7f0daf\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:to=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_TermLoanMember_6a7e4ae8-99e6-454e-9bbb-35bee335ed4a\" xlink:href=\"pwr-20240630.xsd#pwr_TermLoanMember\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_pwr_TermLoanMember_6a7e4ae8-99e6-454e-9bbb-35bee335ed4a\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RevolvingCreditFacilityMember_9d861101-3ede-4f98-8d1e-a06f81d20d83\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_us-gaap_RevolvingCreditFacilityMember_9d861101-3ede-4f98-8d1e-a06f81d20d83\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LetterOfCreditMember_8a7dc4bb-df08-4037-87eb-d9f548ae34f2\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LetterOfCreditMember\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_us-gaap_LetterOfCreditMember_8a7dc4bb-df08-4037-87eb-d9f548ae34f2\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember_ba41f3f4-076b-4b29-8788-064b7f2d51f1\" xlink:href=\"pwr-20240630.xsd#pwr_LettersOfCreditAndBankGuaranteesMember\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember_ba41f3f4-076b-4b29-8788-064b7f2d51f1\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:to=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SeniorCreditFacilityMember_6e39c1eb-ecb6-417e-a57b-fd284cb43fe5\" xlink:href=\"pwr-20240630.xsd#pwr_SeniorCreditFacilityMember\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:to=\"loc_pwr_SeniorCreditFacilityMember_6e39c1eb-ecb6-417e-a57b-fd284cb43fe5\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SuretyBackedLettersOfCreditMember_b0d6f9fb-34b2-4630-87a6-19a53161ff17\" xlink:href=\"pwr-20240630.xsd#pwr_SuretyBackedLettersOfCreditMember\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:to=\"loc_pwr_SuretyBackedLettersOfCreditMember_b0d6f9fb-34b2-4630-87a6-19a53161ff17\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:to=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditMember_591f3758-98d8-4d84-a98e-6cee9a10620b\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:to=\"loc_us-gaap_LineOfCreditMember_591f3758-98d8-4d84-a98e-6cee9a10620b\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:href=\"https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_CurrencyAxis\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_AllCurrenciesDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:to=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_USD_2ff3c288-7312-42ca-9260-e9ff2cdfda3b\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_USD\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:to=\"loc_currency_USD_2ff3c288-7312-42ca-9260-e9ff2cdfda3b\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_AustralianAndCanadianDollarsMember_9de057e1-e9fd-48c8-af6b-a3fa22d9b848\" xlink:href=\"pwr-20240630.xsd#pwr_AustralianAndCanadianDollarsMember\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:to=\"loc_pwr_AustralianAndCanadianDollarsMember_9de057e1-e9fd-48c8-af6b-a3fa22d9b848\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:to=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventMember_7d6a9e6e-2694-461e-8af1-108b2b268bb5\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:to=\"loc_us-gaap_SubsequentEventMember_7d6a9e6e-2694-461e-8af1-108b2b268bb5\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityLineItems\"/>\n    <link:presentationArc order=\"6\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_569e8673-e3f8-42be-8440-b795b0e2af2d\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\"/>\n    <link:presentationArc order=\"1\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_569e8673-e3f8-42be-8440-b795b0e2af2d\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_CrossDefaultProvisions_2f31e51c-5916-476f-b3ce-6b377eb9e25d\" xlink:href=\"pwr-20240630.xsd#pwr_CrossDefaultProvisions\"/>\n    <link:presentationArc order=\"2\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_pwr_CrossDefaultProvisions_2f31e51c-5916-476f-b3ce-6b377eb9e25d\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCredit_2a9b5c3e-f31d-443b-ac08-d514ffbef4f7\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCredit\"/>\n    <link:presentationArc order=\"3\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCredit_2a9b5c3e-f31d-443b-ac08-d514ffbef4f7\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LettersOfCreditOutstandingAmount_91730be3-549f-4520-a375-8fb7e3cf25ec\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LettersOfCreditOutstandingAmount\"/>\n    <link:presentationArc order=\"4\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LettersOfCreditOutstandingAmount_91730be3-549f-4520-a375-8fb7e3cf25ec\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_388992ad-7ff5-46c0-85cc-9c3aff655e77\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_388992ad-7ff5-46c0-85cc-9c3aff655e77\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n  </link:presentationLink>\n  </link:linkbase>\n\n\n##Calculation linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"/>\n\n\n##Definition linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xbrldt=\"http://xbrl.org/2005/xbrldt\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/all\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#all\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain\"/>\n  <link:arcroleRef arcroleURI=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member\"/>\n  <link:roleRef roleURI=\"http://quantaservices.com/role/DebtObligationsSeniorCreditFacilityNarrativeDetails\" xlink:type=\"simple\" xlink:href=\"pwr-20240630.xsd#DebtObligationsSeniorCreditFacilityNarrativeDetails\"/>\n  <link:definitionLink xlink:role=\"http://quantaservices.com/role/DebtObligationsSeniorCreditFacilityNarrativeDetails\" xlink:type=\"extended\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityLineItems\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityTable\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/all\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:type=\"arc\" order=\"1\" xbrldt:closed=\"true\" xbrldt:contextElement=\"segment\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityDomain_3daf94d3-177f-4b1c-87aa-da0b78cf3220_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:to=\"loc_us-gaap_CreditFacilityDomain_3daf94d3-177f-4b1c-87aa-da0b78cf3220_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_CreditFacilityAxis_3daf94d3-177f-4b1c-87aa-da0b78cf3220\" xlink:to=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_TermLoanMember_6a7e4ae8-99e6-454e-9bbb-35bee335ed4a\" xlink:href=\"pwr-20240630.xsd#pwr_TermLoanMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_pwr_TermLoanMember_6a7e4ae8-99e6-454e-9bbb-35bee335ed4a\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RevolvingCreditFacilityMember_9d861101-3ede-4f98-8d1e-a06f81d20d83\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_us-gaap_RevolvingCreditFacilityMember_9d861101-3ede-4f98-8d1e-a06f81d20d83\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LetterOfCreditMember_8a7dc4bb-df08-4037-87eb-d9f548ae34f2\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LetterOfCreditMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_us-gaap_LetterOfCreditMember_8a7dc4bb-df08-4037-87eb-d9f548ae34f2\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember_ba41f3f4-076b-4b29-8788-064b7f2d51f1\" xlink:href=\"pwr-20240630.xsd#pwr_LettersOfCreditAndBankGuaranteesMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_CreditFacilityDomain_be04bfc4-26ca-418f-b7d7-a7d4db258070\" xlink:to=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember_ba41f3f4-076b-4b29-8788-064b7f2d51f1\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentNameDomain_1dad441e-7331-4642-b02b-b322f05457bb_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:to=\"loc_us-gaap_DebtInstrumentNameDomain_1dad441e-7331-4642-b02b-b322f05457bb_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_DebtInstrumentAxis_1dad441e-7331-4642-b02b-b322f05457bb\" xlink:to=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SeniorCreditFacilityMember_6e39c1eb-ecb6-417e-a57b-fd284cb43fe5\" xlink:href=\"pwr-20240630.xsd#pwr_SeniorCreditFacilityMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:to=\"loc_pwr_SeniorCreditFacilityMember_6e39c1eb-ecb6-417e-a57b-fd284cb43fe5\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SuretyBackedLettersOfCreditMember_b0d6f9fb-34b2-4630-87a6-19a53161ff17\" xlink:href=\"pwr-20240630.xsd#pwr_SuretyBackedLettersOfCreditMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_DebtInstrumentNameDomain_fe3a8a82-14ae-421a-8d28-9720c48690c6\" xlink:to=\"loc_pwr_SuretyBackedLettersOfCreditMember_b0d6f9fb-34b2-4630-87a6-19a53161ff17\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeDomain_f1234f1a-cb07-469c-b9a4-542cdc3bd891_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:to=\"loc_us-gaap_LongtermDebtTypeDomain_f1234f1a-cb07-469c-b9a4-542cdc3bd891_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_LongtermDebtTypeAxis_f1234f1a-cb07-469c-b9a4-542cdc3bd891\" xlink:to=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditMember_591f3758-98d8-4d84-a98e-6cee9a10620b\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LongtermDebtTypeDomain_b2f06a12-2dd5-4e44-a9a2-441adb14f38a\" xlink:to=\"loc_us-gaap_LineOfCreditMember_591f3758-98d8-4d84-a98e-6cee9a10620b\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:href=\"https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_CurrencyAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_AllCurrenciesDomain_a5165ba6-91ac-4d64-9f61-ad9e348b910b_default\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_AllCurrenciesDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:to=\"loc_currency_AllCurrenciesDomain_a5165ba6-91ac-4d64-9f61-ad9e348b910b_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_AllCurrenciesDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_srt_CurrencyAxis_a5165ba6-91ac-4d64-9f61-ad9e348b910b\" xlink:to=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_USD_2ff3c288-7312-42ca-9260-e9ff2cdfda3b\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_USD\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:to=\"loc_currency_USD_2ff3c288-7312-42ca-9260-e9ff2cdfda3b\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_AustralianAndCanadianDollarsMember_9de057e1-e9fd-48c8-af6b-a3fa22d9b848\" xlink:href=\"pwr-20240630.xsd#pwr_AustralianAndCanadianDollarsMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_currency_AllCurrenciesDomain_136d02bd-d808-4fcb-b5b0-7ad80b9a4b83\" xlink:to=\"loc_pwr_AustralianAndCanadianDollarsMember_9de057e1-e9fd-48c8-af6b-a3fa22d9b848\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable_c810c054-18fe-4805-bc70-6f7c67b52542\" xlink:to=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeDomain_738b335f-d03f-433f-8229-02d1e79f86e8_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:to=\"loc_us-gaap_SubsequentEventTypeDomain_738b335f-d03f-433f-8229-02d1e79f86e8_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_SubsequentEventTypeAxis_738b335f-d03f-433f-8229-02d1e79f86e8\" xlink:to=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventMember_7d6a9e6e-2694-461e-8af1-108b2b268bb5\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_SubsequentEventTypeDomain_a1b2625a-d9b1-4b4c-a9c6-e3991dfa78e1\" xlink:to=\"loc_us-gaap_SubsequentEventMember_7d6a9e6e-2694-461e-8af1-108b2b268bb5\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_569e8673-e3f8-42be-8440-b795b0e2af2d\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_569e8673-e3f8-42be-8440-b795b0e2af2d\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_CrossDefaultProvisions_2f31e51c-5916-476f-b3ce-6b377eb9e25d\" xlink:href=\"pwr-20240630.xsd#pwr_CrossDefaultProvisions\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_pwr_CrossDefaultProvisions_2f31e51c-5916-476f-b3ce-6b377eb9e25d\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCredit_2a9b5c3e-f31d-443b-ac08-d514ffbef4f7\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCredit\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCredit_2a9b5c3e-f31d-443b-ac08-d514ffbef4f7\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LettersOfCreditOutstandingAmount_91730be3-549f-4520-a375-8fb7e3cf25ec\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LettersOfCreditOutstandingAmount\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LettersOfCreditOutstandingAmount_91730be3-549f-4520-a375-8fb7e3cf25ec\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_388992ad-7ff5-46c0-85cc-9c3aff655e77\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems_2af0d0ad-768e-4115-8a95-7a1276c9dd51\" xlink:to=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_388992ad-7ff5-46c0-85cc-9c3aff655e77\" xlink:type=\"arc\" order=\"4\"/>\n  </link:definitionLink>\n  </link:linkbase>\n\n\n##Label linkbase document\n<?xml version='1.0' encoding='UTF-8'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodStartLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/netLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedNetLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTerseLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodEndLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTotalLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel\"/>\n  <link:labelLink xlink:role=\"http://www.xbrl.org/2003/role/link\" xlink:type=\"extended\"><link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_CommercialPaperProgramMember\" xlink:href=\"pwr-20240630.xsd#pwr_CommercialPaperProgramMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_CommercialPaperProgramMember\" xlink:to=\"lab_pwr_CommercialPaperProgramMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_CommercialPaperProgramMember_494b7d00-94d0-4b41-ba88-c515a24f8902_terseLabel_en-US\" xlink:label=\"lab_pwr_CommercialPaperProgramMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Commercial Paper Program</link:label>\n    <link:label id=\"lab_pwr_CommercialPaperProgramMember_label_en-US\" xlink:label=\"lab_pwr_CommercialPaperProgramMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Commercial Paper Program [Member]</link:label>\n    <link:label id=\"lab_pwr_CommercialPaperProgramMember_documentation_en-US\" xlink:label=\"lab_pwr_CommercialPaperProgramMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Commercial Paper Program</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LongtermDebtTypeAxis\" xlink:to=\"lab_us-gaap_LongtermDebtTypeAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LongtermDebtTypeAxis_9a80593d-abba-404f-b3d0-fe6968287c47_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LongtermDebtTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Long-term Debt, Type [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_LongtermDebtTypeAxis_label_en-US\" xlink:label=\"lab_us-gaap_LongtermDebtTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Long-Term Debt, Type [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentNameDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_DebtInstrumentNameDomain\" xlink:to=\"lab_us-gaap_DebtInstrumentNameDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_DebtInstrumentNameDomain_9f2cdb71-10ff-4545-a54a-e493e6b14963_terseLabel_en-US\" xlink:label=\"lab_us-gaap_DebtInstrumentNameDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Instrument, Name [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_DebtInstrumentNameDomain_label_en-US\" xlink:label=\"lab_us-gaap_DebtInstrumentNameDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Instrument, Name [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LetterOfCreditMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LetterOfCreditMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LetterOfCreditMember\" xlink:to=\"lab_us-gaap_LetterOfCreditMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LetterOfCreditMember_024f42bf-3992-4626-ade1-d8f53c6d6a79_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LetterOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters of Credit</link:label>\n    <link:label id=\"lab_us-gaap_LetterOfCreditMember_label_en-US\" xlink:label=\"lab_us-gaap_LetterOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Letter of Credit [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CreditFacilityDomain\" xlink:to=\"lab_us-gaap_CreditFacilityDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CreditFacilityDomain_32644adc-8bf0-4a05-8305-a50a6e7a2e10_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CreditFacilityDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Credit Facility [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_CreditFacilityDomain_label_en-US\" xlink:label=\"lab_us-gaap_CreditFacilityDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Credit Facility [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RevolvingCreditFacilityMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_RevolvingCreditFacilityMember\" xlink:to=\"lab_us-gaap_RevolvingCreditFacilityMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_RevolvingCreditFacilityMember_ec4720fc-8e23-41f6-a978-3a488e0305cb_terseLabel_en-US\" xlink:label=\"lab_us-gaap_RevolvingCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Revolving Credit Facility</link:label>\n    <link:label id=\"lab_us-gaap_RevolvingCreditFacilityMember_label_en-US\" xlink:label=\"lab_us-gaap_RevolvingCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Revolving Credit Facility [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_CrossDefaultProvisions\" xlink:href=\"pwr-20240630.xsd#pwr_CrossDefaultProvisions\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_CrossDefaultProvisions\" xlink:to=\"lab_pwr_CrossDefaultProvisions\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_CrossDefaultProvisions_22b17e81-4272-4f7b-a31d-ddcc05ecb147_terseLabel_en-US\" xlink:label=\"lab_pwr_CrossDefaultProvisions\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Cross default provisions</link:label>\n    <link:label id=\"lab_pwr_CrossDefaultProvisions_label_en-US\" xlink:label=\"lab_pwr_CrossDefaultProvisions\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Cross Default Provisions</link:label>\n    <link:label id=\"lab_pwr_CrossDefaultProvisions_documentation_en-US\" xlink:label=\"lab_pwr_CrossDefaultProvisions\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Cross Default Provisions</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_USD\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_USD\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_currency_USD\" xlink:to=\"lab_currency_USD\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_currency_USD_421c0cc7-8e63-4d69-ada5-0f7c6d8138cc_terseLabel_en-US\" xlink:label=\"lab_currency_USD\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">U.S. Dollar</link:label>\n    <link:label id=\"lab_currency_USD_label_en-US\" xlink:label=\"lab_currency_USD\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">United States of America, Dollars</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommercialPaperMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommercialPaperMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CommercialPaperMember\" xlink:to=\"lab_us-gaap_CommercialPaperMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CommercialPaperMember_5ba98c14-b1a7-4ca3-93dc-47318838ffb4_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CommercialPaperMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Commercial Paper</link:label>\n    <link:label id=\"lab_us-gaap_CommercialPaperMember_label_en-US\" xlink:label=\"lab_us-gaap_CommercialPaperMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Commercial Paper [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityTable\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityTable\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityTable\" xlink:to=\"lab_us-gaap_LineOfCreditFacilityTable\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityTable_8c105e4f-9043-4652-8a82-54bacd7198f6_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityTable\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit Facility [Table]</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityTable_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityTable\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit Facility [Table]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LettersOfCreditOutstandingAmount\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LettersOfCreditOutstandingAmount\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LettersOfCreditOutstandingAmount\" xlink:to=\"lab_us-gaap_LettersOfCreditOutstandingAmount\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LettersOfCreditOutstandingAmount_a1b1372c-c5ab-45b9-8f3b-3dabd8d4c6a4_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LettersOfCreditOutstandingAmount\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters of credit and bank guarantees</link:label>\n    <link:label id=\"lab_us-gaap_LettersOfCreditOutstandingAmount_label_en-US\" xlink:label=\"lab_us-gaap_LettersOfCreditOutstandingAmount\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters of Credit Outstanding, Amount</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_srt_CurrencyAxis\" xlink:href=\"https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_CurrencyAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_srt_CurrencyAxis\" xlink:to=\"lab_srt_CurrencyAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_srt_CurrencyAxis_837e4375-5e8d-4ea6-9807-57dc654618f2_terseLabel_en-US\" xlink:label=\"lab_srt_CurrencyAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Currency [Axis]</link:label>\n    <link:label id=\"lab_srt_CurrencyAxis_label_en-US\" xlink:label=\"lab_srt_CurrencyAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Currency [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SubsequentEventMember\" xlink:to=\"lab_us-gaap_SubsequentEventMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SubsequentEventMember_42b257a1-7bf8-460d-8acd-9ebef0a05de8_terseLabel_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event</link:label>\n    <link:label id=\"lab_us-gaap_SubsequentEventMember_label_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCreditMember\" xlink:to=\"lab_us-gaap_LineOfCreditMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCreditMember_2dd27853-302a-44c0-93f0-6f8061438a5e_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCreditMember_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_AustralianAndCanadianDollarsMember\" xlink:href=\"pwr-20240630.xsd#pwr_AustralianAndCanadianDollarsMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_AustralianAndCanadianDollarsMember\" xlink:to=\"lab_pwr_AustralianAndCanadianDollarsMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_AustralianAndCanadianDollarsMember_c68dd02a-8271-456a-8558-770b80a50fe5_terseLabel_en-US\" xlink:label=\"lab_pwr_AustralianAndCanadianDollarsMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Australian And Canadian Dollars</link:label>\n    <link:label id=\"lab_pwr_AustralianAndCanadianDollarsMember_label_en-US\" xlink:label=\"lab_pwr_AustralianAndCanadianDollarsMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Australian And Canadian Dollars [Member]</link:label>\n    <link:label id=\"lab_pwr_AustralianAndCanadianDollarsMember_documentation_en-US\" xlink:label=\"lab_pwr_AustralianAndCanadianDollarsMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Australian And Canadian Dollars</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCredit\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCredit\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCredit\" xlink:to=\"lab_us-gaap_LineOfCredit\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCredit_c2916dda-e675-4bf3-9278-f6aeb6c76442_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCredit\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Borrowings under senior credit facility and commercial paper program</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCredit_dbe6f3b1-7aa1-422b-8d2a-37cc2323d724_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCredit\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Amount outstanding under the credit facility</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCredit_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCredit\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Long-Term Line of Credit</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_TermLoanMember\" xlink:href=\"pwr-20240630.xsd#pwr_TermLoanMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_TermLoanMember\" xlink:to=\"lab_pwr_TermLoanMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_TermLoanMember_98115ad5-1b7f-435d-8e6b-88b4a63f17be_terseLabel_en-US\" xlink:label=\"lab_pwr_TermLoanMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Term Loan</link:label>\n    <link:label id=\"lab_pwr_TermLoanMember_label_en-US\" xlink:label=\"lab_pwr_TermLoanMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Term Loan [Member]</link:label>\n    <link:label id=\"lab_pwr_TermLoanMember_documentation_en-US\" xlink:label=\"lab_pwr_TermLoanMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Term Loan [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:href=\"pwr-20240630.xsd#pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:to=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember_96ed7e69-c592-4bb9-b8a7-f747cd8d0a93_terseLabel_en-US\" xlink:label=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters of Credit Outside of the Senior Credit Facility</link:label>\n    <link:label id=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember_label_en-US\" xlink:label=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters Of Credit Outside Of The Senior Credit Facility [Member]</link:label>\n    <link:label id=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember_documentation_en-US\" xlink:label=\"lab_pwr_LettersOfCreditOutsideOfTheSeniorCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters Of Credit Outside Of The Senior Credit Facility</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_currency_AllCurrenciesDomain\" xlink:href=\"https://xbrl.sec.gov/currency/2024/currency-2024.xsd#currency_AllCurrenciesDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_currency_AllCurrenciesDomain\" xlink:to=\"lab_currency_AllCurrenciesDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_currency_AllCurrenciesDomain_45d79c4f-4e8f-438c-ab34-35cb8db9c17b_terseLabel_en-US\" xlink:label=\"lab_currency_AllCurrenciesDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">All Currencies [Domain]</link:label>\n    <link:label id=\"lab_currency_AllCurrenciesDomain_label_en-US\" xlink:label=\"lab_currency_AllCurrenciesDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">All Currencies [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtDisclosureAbstract\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtDisclosureAbstract\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_DebtDisclosureAbstract\" xlink:to=\"lab_us-gaap_DebtDisclosureAbstract\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_DebtDisclosureAbstract_f627ca47-c9d3-448c-9425-70e04e8401e1_terseLabel_en-US\" xlink:label=\"lab_us-gaap_DebtDisclosureAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Disclosure [Abstract]</link:label>\n    <link:label id=\"lab_us-gaap_DebtDisclosureAbstract_label_en-US\" xlink:label=\"lab_us-gaap_DebtDisclosureAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Disclosure [Abstract]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LongtermDebtTypeDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LongtermDebtTypeDomain\" xlink:to=\"lab_us-gaap_LongtermDebtTypeDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LongtermDebtTypeDomain_595d0fb6-e231-467c-bc3a-24fc0bef1dee_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LongtermDebtTypeDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Long-term Debt, Type [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_LongtermDebtTypeDomain_label_en-US\" xlink:label=\"lab_us-gaap_LongtermDebtTypeDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Long-Term Debt, Type [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SubsequentEventTypeAxis\" xlink:to=\"lab_us-gaap_SubsequentEventTypeAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SubsequentEventTypeAxis_15159f61-8b25-41ae-a748-9e5042832a62_terseLabel_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event Type [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_SubsequentEventTypeAxis_label_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event Type [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:href=\"pwr-20240630.xsd#pwr_LettersOfCreditAndBankGuaranteesMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:to=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember_1e1b8f38-ac0a-4eda-a8d2-aafcea28230e_terseLabel_en-US\" xlink:label=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters of Credit and Bank Guarantees</link:label>\n    <link:label id=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember_label_en-US\" xlink:label=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Letters Of Credit and Bank Guarantees [Member]</link:label>\n    <link:label id=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember_documentation_en-US\" xlink:label=\"lab_pwr_LettersOfCreditAndBankGuaranteesMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">The Letters Of Credit and Bank Guarantees.</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SubsequentEventTypeDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsequentEventTypeDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SubsequentEventTypeDomain\" xlink:to=\"lab_us-gaap_SubsequentEventTypeDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SubsequentEventTypeDomain_f36705b7-8806-4e62-9c8c-445886c2d2c6_terseLabel_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventTypeDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event Type [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_SubsequentEventTypeDomain_label_en-US\" xlink:label=\"lab_us-gaap_SubsequentEventTypeDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Subsequent Event Type [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\" xlink:to=\"lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_e4ed5c3a-aa9e-4eb6-9b9e-b3cc52a0ba79_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Borrowing capacity</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity\" 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>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityLineItems\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityLineItems\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityLineItems\" xlink:to=\"lab_us-gaap_LineOfCreditFacilityLineItems\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityLineItems_c61d54d1-a0ce-4755-91bc-dc536ac837ea_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityLineItems\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit Facility [Line Items]</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityLineItems_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityLineItems\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit Facility [Line Items]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CreditFacilityAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CreditFacilityAxis\" xlink:to=\"lab_us-gaap_CreditFacilityAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CreditFacilityAxis_8341f716-c115-4c7a-a23a-e7dd46e07067_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CreditFacilityAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Credit Facility [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_CreditFacilityAxis_label_en-US\" xlink:label=\"lab_us-gaap_CreditFacilityAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Credit Facility [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DebtInstrumentAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_DebtInstrumentAxis\" xlink:to=\"lab_us-gaap_DebtInstrumentAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_DebtInstrumentAxis_d0952944-dafa-41eb-ba21-195e66149ead_terseLabel_en-US\" xlink:label=\"lab_us-gaap_DebtInstrumentAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Instrument [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_DebtInstrumentAxis_label_en-US\" xlink:label=\"lab_us-gaap_DebtInstrumentAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Debt Instrument [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SuretyBackedLettersOfCreditMember\" xlink:href=\"pwr-20240630.xsd#pwr_SuretyBackedLettersOfCreditMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_SuretyBackedLettersOfCreditMember\" xlink:to=\"lab_pwr_SuretyBackedLettersOfCreditMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_SuretyBackedLettersOfCreditMember_faa0aa0a-5460-449e-bf68-6257ad4b670e_terseLabel_en-US\" xlink:label=\"lab_pwr_SuretyBackedLettersOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Surety-Backed Letters Of Credit</link:label>\n    <link:label id=\"lab_pwr_SuretyBackedLettersOfCreditMember_label_en-US\" xlink:label=\"lab_pwr_SuretyBackedLettersOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Surety-Backed Letters Of Credit [Member]</link:label>\n    <link:label id=\"lab_pwr_SuretyBackedLettersOfCreditMember_documentation_en-US\" xlink:label=\"lab_pwr_SuretyBackedLettersOfCreditMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Surety-Backed Letters Of Credit</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\" xlink:to=\"lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_ade28c81-3c8f-4517-86cc-e04db173e7d1_terseLabel_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Credit facility available for revolving loans or issuing new letters of credit</link:label>\n    <link:label id=\"lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_label_en-US\" xlink:label=\"lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Line of Credit Facility, Remaining Borrowing Capacity</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_pwr_SeniorCreditFacilityMember\" xlink:href=\"pwr-20240630.xsd#pwr_SeniorCreditFacilityMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_pwr_SeniorCreditFacilityMember\" xlink:to=\"lab_pwr_SeniorCreditFacilityMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_pwr_SeniorCreditFacilityMember_a801c63b-de15-4f80-9d83-32f45aa91cff_terseLabel_en-US\" xlink:label=\"lab_pwr_SeniorCreditFacilityMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Senior Credit Facility</link:label>\n    <link:l\n\n##Instance document\n<?xml version='1.0' encoding='UTF-8'?>\n<xbrl xmlns=\"http://www.xbrl.org/2003/instance\" xmlns:country=\"http://xbrl.sec.gov/country/2024\" xmlns:currency=\"http://xbrl.sec.gov/currency/2024\" xmlns:dei=\"http://xbrl.sec.gov/dei/2024\" xmlns:ecd=\"http://xbrl.sec.gov/ecd/2024\" xmlns:iso4217=\"http://www.xbrl.org/2003/iso4217\" xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:pwr=\"http://quantaservices.com/20240630\" xmlns:srt=\"http://fasb.org/srt/2024\" xmlns:us-gaap=\"http://fasb.org/us-gaap/2024\" xmlns:utr=\"http://www.xbrl.org/2009/utr\" xmlns:xbrldi=\"http://xbrl.org/2006/xbrldi\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xml:lang=\"en-US\"><link:schemaRef xlink:href=\"pwr-20240630.xsd\" xlink:type=\"simple\"/>\n\t<context id=\"c-219\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0001050915</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:CreditFacilityAxis\">us-gaap:RevolvingCreditFacilityMember</xbrldi:explicitMember>\n                <xbrldi:explicitMember dimension=\"us-gaap:DebtInstrumentAxis\">pwr:SeniorCreditFacilityMember</xbrldi:explicitMember>\n                <xbrldi:explicitMember dimension=\"us-gaap:LongtermDebtTypeAxis\">us-gaap:LineOfCreditMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2024-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-220\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0001050915</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:CreditFacilityAxis\">us-gaap:RevolvingCreditFacilityMember</xbrldi:explicitMember>\n                <xbrldi:explicitMember dimension=\"us-gaap:DebtInstrumentAxis\">pwr:SeniorCreditFacilityMember</xbrldi:explicitMember>\n                <xbrldi:explicitMember dimension=\"us-gaap:LongtermDebtTypeAxis\">us-gaap:LineOfCreditMember</xbrldi:explicitMember>\n                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<identifier scheme=\"http://www.sec.gov/CIK\">0001050915</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:DebtInstrumentAxis\">pwr:LettersOfCreditOutsideOfTheSeniorCreditFacilityMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2024-06-30</instant>\n        </period>\n    </context>\n\t<context id=\"c-231\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0001050915</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:DebtInstrumentAxis\">pwr:SeniorCreditFacilityMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <instant>2024-06-30</instant>\n        </period>\n    </context>\n\t<unit id=\"shares\">\n        <measure>shares</measure>\n    </unit>\n\t<unit id=\"usd\">\n        <measure>iso4217:USD</measure>\n    </unit>\n\t<unit id=\"usdPerShare\">\n        <divide>\n            <unitNumerator>\n                <measure>iso4217:USD</measure>\n            </unitNumerator>\n            <unitDenominator>\n                <measure>shares</measure>\n            </unitDenominator>\n        </divide>\n    </unit>\n\t<unit id=\"number\">\n        <measure>pure</measure>\n    </unit>\n\t<unit id=\"pool\">\n        <measure>pwr:pool</measure>\n    </unit>\n\t<unit id=\"customer\">\n        <measure>pwr:customer</measure>\n    </unit>\n\t<unit id=\"segment\">\n        <measure>pwr:segment</measure>\n    </unit>\n\t<unit id=\"business\">\n        <measure>pwr:business</measure>\n    </unit>\n\t<unit id=\"acre\">\n        <measure>utr:acre</measure>\n    </unit>\n\t<us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity contextRef=\"c-219\" decimals=\"-7\" id=\"f-867\" unitRef=\"usd\">2640000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>\n\t<us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity contextRef=\"c-220\" decimals=\"-7\" id=\"f-868\" unitRef=\"usd\">2800000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>\n\t<us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity contextRef=\"c-221\" decimals=\"-5\" id=\"f-869\" unitRef=\"usd\">500000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>\n\t<us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity contextRef=\"c-223\" decimals=\"-5\" id=\"f-871\" unitRef=\"usd\">750000000.0</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>\n\t<us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity contextRef=\"c-219\" decimals=\"-7\" id=\"f-872\" unitRef=\"usd\">2640000000</us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity>\n\t<pwr:CrossDefaultProvisions contextRef=\"c-222\" decimals=\"-5\" id=\"f-870\" unitRef=\"usd\">400000000</pwr:CrossDefaultProvisions>\n\t<us-gaap:LineOfCredit contextRef=\"c-3\" decimals=\"-3\" id=\"f-837\" unitRef=\"usd\">858613000</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-4\" decimals=\"-3\" id=\"f-838\" unitRef=\"usd\">867137000</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-212\" decimals=\"-3\" id=\"f-839\" unitRef=\"usd\">0</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-213\" decimals=\"-3\" id=\"f-840\" unitRef=\"usd\">705900000</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-223\" decimals=\"-5\" id=\"f-886\" unitRef=\"usd\">721900000</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-219\" decimals=\"-5\" id=\"f-887\" unitRef=\"usd\">136700000</us-gaap:LineOfCredit>\n\t<us-gaap:LineOfCredit contextRef=\"c-212\" decimals=\"INF\" id=\"f-892\" unitRef=\"usd\">0</us-gaap:LineOfCredit>\n\t<us-gaap:LettersOfCreditOutstandingAmount contextRef=\"c-228\" decimals=\"-5\" id=\"f-888\" unitRef=\"usd\">249200000</us-gaap:LettersOfCreditOutstandingAmount>\n\t<us-gaap:LettersOfCreditOutstandingAmount contextRef=\"c-229\" decimals=\"-5\" id=\"f-889\" unitRef=\"usd\">94800000</us-gaap:LettersOfCreditOutstandingAmount>\n\t<us-gaap:LettersOfCreditOutstandingAmount contextRef=\"c-230\" decimals=\"-5\" id=\"f-890\" unitRef=\"usd\">154400000</us-gaap:LettersOfCreditOutstandingAmount>\n\t<us-gaap:LettersOfCreditOutstandingAmount contextRef=\"c-238\" decimals=\"-5\" id=\"f-911\" unitRef=\"usd\">543200000</us-gaap:LettersOfCreditOutstandingAmount>\n\t<us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity contextRef=\"c-231\" decimals=\"-7\" id=\"f-891\" unitRef=\"usd\">2250000000</us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity>\n\t</xbrl>\n\n\n\n##US GAAP Taxonomy\n[Concept Core]\nID: srt:CurrencyAxis\nLabel: Currency [Axis]\nType: xbrli:stringItemType | Balance: None | PeriodType: duration | Abstract: True\nStatus: None | DeprecatedLabel: None | DeprecatedDate: None\nDocumentation:\nInformation by currency.\n\nProvenance: file=GAAP_Taxonomy_2024.xlsx | sheet=Concepts | row=351\n\n\n[Concept Relations]\nID: srt:CurrencyAxis\n\nPresentation:\n- Role: http://fasb.org/us-gaap/role/statement/CommonDomainMembers\n  Path: Statement [Table] > Currency [Axis]\n  PreferredLabel: None\n- Role: http://fasb.org/us-gaap/role/statement/CommonDomainMembers\n  Path: Currency [Axis] > All Currencies [Domain]\n  PreferredLabel: None\nProvenance: sheets include Presentation-like sheets\n\n\n[Concept Relations]\nID: srt:CurrencyAxis\n\nDefinition (Dimensions/Domain/Hypercube):\n- http://xbrl.org/int/dim/arcrole/hypercube-dimension: from=us-gaap:StatementTable -> to=srt:CurrencyAxis (role=http://fasb.org/us-gaap/role/statement/CommonDomainMembersStatementTable)\n- http://xbrl.org/int/dim/arcrole/dimension-domain: from=srt:CurrencyAxis -> to=currency:AllCurrenciesDomain (role=http://fasb.org/us-gaap/role/statement/CommonDomainMembersStatementTable)\n- http://xbrl.org/int/dim/arcrole/dimension-default: from=srt:CurrencyAxis -> to=currency:AllCurrenciesDomain (role=http://fasb.org/us-gaap/role/statement/CommonDomainMembersStatementTable)\nProvenance: sheets include Definition-like sheets\n\n\n[Concept Relations]\nID: srt:CurrencyAxis\n\nReferences:\n- Taxonomy Technical Improvement | None | None\nProvenance: sheets include Reference-like sheets\n\nQuestion: What erroneous relationship type exists between srt:CurrencyAxis and pwr:AustralianAndCanadianDollarsMember, based on the provided XBRL filing and the US GAAP taxonomy?\nAnswer:\n\n    "

Answer: "CombinationErr"