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    <link:label id="lab_us-gaap_GoodwillImpairmentLoss_9CC96528847096D68D755573A10A89C9_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_9CC96528847096D68D755573A10A89C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Impairment Loss</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_9CC96528847096D68D755573A10A89C9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_76C95959CA10D12407BE5573A10AAD16_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_76C95959CA10D12407BE5573A10AAD16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_002E112B44C6062C33165573A10AC59A_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_002E112B44C6062C33165573A10AC59A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_002E112B44C6062C33165573A10AC59A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_A28D4F8CAAC9179979EC5573A10A34FB" xlink:type="locator" />
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    <link:label id="lab_itri_Warranty_7B9D9178ED92C6C5E4D95573A10AE50D_terseLabel_en-US" xlink:label="lab_itri_Warranty_7B9D9178ED92C6C5E4D95573A10AE50D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warranty</link:label>
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    <link:label id="lab_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:label id="lab_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4" xlink:to="lab_us-gaap_VariableRateAxis_786AA34D262F1986EA32152EFBDEB3F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Rate [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43" xlink:to="lab_us-gaap_VariableRateDomain_1F514AE40224E71734C5152EFBDEDC43" xlink:type="arc" />
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">London Interbank Offered Rate (LIBOR) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A" xlink:to="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_99FF5C4A95A7EC5F85DF152EFBDE043A" xlink:type="arc" />
    <link:label id="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74_terseLabel_en-US" xlink:label="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">EURIBOR [Member]</link:label>
    <link:label id="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74_label_en-US" xlink:label="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">EURIBOR [Member]</link:label>
    <link:label id="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74_documentation_en-US" xlink:label="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">EURIBOR Euro Interbank Offered Rate [Member]</link:label>
    <link:loc xlink:href="itri-20170930.xsd#itri_EURIBORMember" xlink:label="loc_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:to="lab_itri_EURIBORMember_2CC3EBCD3DE1AD608378152EFBDEBF74" xlink:type="arc" />
    <link:label id="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444_terseLabel_en-US" xlink:label="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternate base rate (1) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444_label_en-US" xlink:label="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternate base rate (1) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444_documentation_en-US" xlink:label="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The first of three alternate base rates under a credit facility agreement.</link:label>
    <link:loc xlink:href="itri-20170930.xsd#itri_AlternateBaseRate1Member" xlink:label="loc_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:to="lab_itri_AlternateBaseRate1Member_CF46C5C8858ADD4FBC1D152EFBDE8444" xlink:type="arc" />
    <link:label id="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122_terseLabel_en-US" xlink:label="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternate base rate (2) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122_label_en-US" xlink:label="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternate base rate (2) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122_documentation_en-US" xlink:label="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The second of three alternate base rates under a credit facility agreement.</link:label>
    <link:loc xlink:href="itri-20170930.xsd#itri_AlternateBaseRate2Member" xlink:label="loc_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:to="lab_itri_AlternateBaseRate2Member_FABCAA5D77660A2CE15A152EFBDE5122" xlink:type="arc" />
    <link:label id="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0_terseLabel_en-US" xlink:label="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternate base rate (3) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0_label_en-US" xlink:label="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternate base rate (3) [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0_documentation_en-US" xlink:label="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The third of three alternate base rates under a credit facility agreement.</link:label>
    <link:loc xlink:href="itri-20170930.xsd#itri_AlternateBaseRate3Member" xlink:label="loc_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:to="lab_itri_AlternateBaseRate3Member_3F5C4BA3F6BFF324CF03152EFBDEFCB0" xlink:type="arc" />
    <link:label id="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578_terseLabel_en-US" xlink:label="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alternate base rate [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578_label_en-US" xlink:label="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Alternate base rate [Member]</link:label>
    <link:label id="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578_documentation_en-US" xlink:label="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Alternate base rate [Member]</link:label>
    <link:loc xlink:href="itri-20170930.xsd#itri_AlternateBaseRateMember" xlink:label="loc_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:to="lab_itri_AlternateBaseRateMember_5383D8780F21130185D8152EFBDE7578" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_E1DAFABEEEDE095DA150152EFBDE3EFC_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_E1DAFABEEEDE095DA150152EFBDE3EFC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_E1DAFABEEEDE095DA150152EFBDE3EFC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_E1DAFABEEEDE095DA150152EFBDE3EFC" xlink:to="lab_us-gaap_LongtermDebtTypeAxis_E1DAFABEEEDE095DA150152EFBDE3EFC" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Swingline sub-facility [Member]</link:label>
    <link:label id="lab_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revolving Credit Facility [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_0B465EF45C1E403A4018152EFBDE3ED9" xlink:type="arc" />
    <link:label id="lab_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401_terseLabel_en-US" xlink:label="lab_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Standby Letters of Credit [Member]</link:label>
    <link:label id="lab_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401_label_en-US" xlink:label="lab_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Standby Letters of Credit [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StandbyLettersOfCreditMember" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401" xlink:to="lab_us-gaap_StandbyLettersOfCreditMember_6381E031C4A94ECB167E152EFBDE1401" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_65BAAF3A809963E32A72152EFBDE989D" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Maximum Borrowing Capacity</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C" 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/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_AE86FCAC0219A5D2CD76152EFBDE910C" xlink:type="arc" />
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:label id="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Line of Credit Facility, Unused Capacity, Commitment Fee Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A" xlink:to="lab_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_A4E87E8EB07BBF27874F152EFBDEBE3A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCollateral_559ABD0A45B1AF56E265152EFBDE7902_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCollateral_559ABD0A45B1AF56E265152EFBDE7902" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Collateral</link:label>
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    <link:label id="lab_itri_DepreciationAndAmortizationExpenseAssociatedWithSegmentsTableTextBlock_F09A68847179B22870D4152EFA4EDDE8_terseLabel_en-US" xlink:label="lab_itri_DepreciationAndAmortizationExpenseAssociatedWithSegmentsTableTextBlock_F09A68847179B22870D4152EFA4EDDE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation And Amortization Expense Associated With Segments [Table Text Block]</link:label>
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    <link:loc xlink:href="itri-20170930.xsd#itri_DepreciationAndAmortizationExpenseAssociatedWithSegmentsTableTextBlock" xlink:label="loc_itri_DepreciationAndAmortizationExpenseAssociatedWithSegmentsTableTextBlock_F09A68847179B22870D4152EFA4EDDE8" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_502CBDE472890E21D5735EDA8E2B196B" xlink:type="locator" />
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    <link:label id="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A_terseLabel_en-US" xlink:label="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Threshold for Reporting Customer Concentration [Member]</link:label>
    <link:label id="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A_label_en-US" xlink:label="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Threshold for Reporting Customer Concentration [Member]</link:label>
    <link:label id="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A_documentation_en-US" xlink:label="lab_itri_ThresholdforReportingCustomerConcentrationMember_7CB58FAD8ABDCCFEC5555EDA8E2B023A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The threshold for reporting customer concentration. For any customer that meets or exceeds this threshold, the percentage of concentration with the given customer or customers is provided.</link:label>
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    <link:label id="lab_itri_CustomerAMember_6101DFE0F92E609B403E5EDA8E2BC789_terseLabel_en-US" xlink:label="lab_itri_CustomerAMember_6101DFE0F92E609B403E5EDA8E2BC789" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Customer A [Member]</link:label>
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    <link:label id="lab_us-gaap_StockOptionPlanExpense_120F79489AD0A19C84FB152EFB16205B_terseLabel_en-US" xlink:label="lab_us-gaap_StockOptionPlanExpense_120F79489AD0A19C84FB152EFB16205B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock options</link:label>
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    <link:label id="lab_us-gaap_RestrictedStockExpense_1468F28DEF59807D8341152EFB160206_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockExpense_1468F28DEF59807D8341152EFB160206" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted stock units</link:label>
    <link:label id="lab_us-gaap_RestrictedStockExpense_1468F28DEF59807D8341152EFB160206_label_en-US" xlink:label="lab_us-gaap_RestrictedStockExpense_1468F28DEF59807D8341152EFB160206" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock or Unit Expense</link:label>
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    <link:label id="lab_itri_UnrestrictedStockAwardsCompensationExpense_A2C321B0375D1E5C0723152EFB164039_terseLabel_en-US" xlink:label="lab_itri_UnrestrictedStockAwardsCompensationExpense_A2C321B0375D1E5C0723152EFB164039" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrestricted stock awards</link:label>
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    <link:label id="lab_itri_UnrestrictedStockAwardsCompensationExpense_A2C321B0375D1E5C0723152EFB164039_documentation_en-US" xlink:label="lab_itri_UnrestrictedStockAwardsCompensationExpense_A2C321B0375D1E5C0723152EFB164039" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">The noncash expense that represents the cost of unrestricted stock distributed to board of directors as a portion of their compensation.</link:label>
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    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_574D2687596EC414BDE6152EFB1651D2_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_574D2687596EC414BDE6152EFB1651D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Phantom stock units</link:label>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_574D2687596EC414BDE6152EFB1651D2_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_574D2687596EC414BDE6152EFB1651D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_574D2687596EC414BDE6152EFB1651D2" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_154AB8E8AB1EC0E04934152EFB16E61E_totalLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_154AB8E8AB1EC0E04934152EFB16E61E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total stock-based compensation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1_154AB8E8AB1EC0E04934152EFB16E61E" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_CD642DBC09D59BC8A212152EFB163160" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ScheduleOfGoodwillTable_FDE1995CDE716E37B6F5152EFC24CCF9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_FDE1995CDE716E37B6F5152EFC24CCF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Goodwill [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfGoodwillTable_FDE1995CDE716E37B6F5152EFC24CCF9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_FDE1995CDE716E37B6F5152EFC24CCF9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Goodwill [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_FDE1995CDE716E37B6F5152EFC24CCF9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillLineItems_CFC19B063743142B5727152EFC240E88_label_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_CFC19B063743142B5727152EFC240E88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Line Items]</link:label>
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    <link:label id="lab_us-gaap_GoodwillRollForward_81F5249E73B355CDC848152EFC2407FB_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_81F5249E73B355CDC848152EFC2407FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_GoodwillRollForward_81F5249E73B355CDC848152EFC2407FB_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_81F5249E73B355CDC848152EFC2407FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_81F5249E73B355CDC848152EFC2407FB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillGross_710AC398005334E80BE3152EFC240608_label_en-US" xlink:label="lab_us-gaap_GoodwillGross_710AC398005334E80BE3152EFC240608" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillGross" xlink:label="loc_us-gaap_GoodwillGross_710AC398005334E80BE3152EFC240608" xlink:type="locator" />
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