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    <link:loc xlink:href="cpn-20190630.xsd#cpn_DebtInstrumentRepurchaseAmountCumulative" xlink:label="loc_cpn_DebtInstrumentRepurchaseAmountCumulative_B4B0118FACB74107DD023261B014C28C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cpn_DebtInstrumentRepurchaseAmountCumulative_B4B0118FACB74107DD023261B014C28C" xlink:to="lab_cpn_DebtInstrumentRepurchaseAmountCumulative_B4B0118FACB74107DD023261B014C28C" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_8A40FCAEE6444FE1F3C04351F381FA27_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_8A40FCAEE6444FE1F3C04351F381FA27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_8A40FCAEE6444FE1F3C04351F381FA27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_8A40FCAEE6444FE1F3C04351F381FA27" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract_8A40FCAEE6444FE1F3C04351F381FA27" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:label id="lab_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE_label_en-US" xlink:label="lab_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE" xlink:to="lab_us-gaap_StatementTable_23491118DFECE98F03484351F38107CE" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Axis]</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis" xlink:label="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117" xlink:to="lab_us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis_B85BF0C2EA69B552B4B24351F3820117" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76_terseLabel_en-US" xlink:label="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Classification [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76_label_en-US" xlink:label="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Classification [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassificationOfVariableInterestEntityDomain" xlink:label="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76" xlink:to="lab_us-gaap_ClassificationOfVariableInterestEntityDomain_F0C5BC369EE0B2064FF64351F382EF76" xlink:type="arc" />
    <link:label id="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E_terseLabel_en-US" xlink:label="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Primary Beneficiary [Member]</link:label>
    <link:label id="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E_label_en-US" xlink:label="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Variable Interest Entity, Primary Beneficiary [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E" xlink:to="lab_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_44C902FB5BCA26BAA95C4351F3826C6E" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6" xlink:to="lab_us-gaap_StatementLineItems_D642C394431BCCEB33914351F3834DA6" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents ($33 and $43 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E622BBAB106DB44792584351F383B05B" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net of allowance of $8 and $9</link:label>
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Receivable, Allowance for Credit Loss, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F" xlink:to="lab_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_77C14A69E5F422B00CEA4351F3830C5F" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_B68C089A7C8D1C52033D4351F383214D_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_B68C089A7C8D1C52033D4351F383214D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash, current ($108 and $90 attributable to VIEs)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_B68C089A7C8D1C52033D4351F383214D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_B68C089A7C8D1C52033D4351F383214D" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_B68C089A7C8D1C52033D4351F383214D" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment, net ($3,873 and $3,919 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_89AD5BDD02AC7F1292D94351F3843FF3" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_173A214BA254230113CD4351F384C51F_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_173A214BA254230113CD4351F384C51F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restricted cash, net of current portion ($48 and $33 attributable to VIEs)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsNoncurrent" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_173A214BA254230113CD4351F384C51F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_173A214BA254230113CD4351F384C51F" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_173A214BA254230113CD4351F384C51F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets ($100 and $30 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_3398820731E550CFF5964351F3847036" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt, current portion ($213 and $201 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt and Lease Obligation, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68" xlink:to="lab_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_F93B9CC938C3AAA6DE8A4351F3841A68" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities ($71 and $36 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1" xlink:to="lab_us-gaap_OtherLiabilitiesCurrent_70E86456B520BAD7B23B4351F384A0F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_699C7852F225ACB011324351F384ABC0_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_699C7852F225ACB011324351F384ABC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt, net of current portion ($1,889 and $1,978 attributable to VIEs)</link:label>
    <link:label id="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_699C7852F225ACB011324351F384ABC0_label_en-US" xlink:label="lab_us-gaap_LongTermDebtAndCapitalLeaseObligations_699C7852F225ACB011324351F384ABC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt and Lease Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_699C7852F225ACB011324351F384ABC0" xlink:type="locator" />
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    <link:label id="lab_cpn_LettersOfCreditIssued_817AAA220B55611D8C103261AE1028B3_documentation_en-US" xlink:label="lab_cpn_LettersOfCreditIssued_817AAA220B55611D8C103261AE1028B3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Letters of credit issued</link:label>
    <link:loc xlink:href="cpn-20190630.xsd#cpn_LettersOfCreditIssued" xlink:label="loc_cpn_LettersOfCreditIssued_817AAA220B55611D8C103261AE1028B3" xlink:type="locator" />
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    <link:label id="lab_cpn_FirstPriorityLiensUnderPowerAndNaturalGasAgreements_EE9C1804FF6B5920AB0C3261AE10C0EB_label_en-US" xlink:label="lab_cpn_FirstPriorityLiensUnderPowerAndNaturalGasAgreements_EE9C1804FF6B5920AB0C3261AE10C0EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">First priority liens under power and natural gas agreements</link:label>
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    <link:label id="lab_cpn_Firstpriorityliensunderinterestratehedginginstruments_9DFB4ECB1AE95518EBC63261AE105987_documentation_en-US" xlink:label="lab_cpn_Firstpriorityliensunderinterestratehedginginstruments_9DFB4ECB1AE95518EBC63261AE105987" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">First priority liens under interest rate hedging instruments</link:label>
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    <link:label id="lab_cpn_LettersofCreditIssuedandFirstPriorityLiensUnderPowerNaturalGasAndInterestRateHedgingInstruments_4885295397804566C6223261AE10C61F_totalLabel_en-US" xlink:label="lab_cpn_LettersofCreditIssuedandFirstPriorityLiensUnderPowerNaturalGasAndInterestRateHedgingInstruments_4885295397804566C6223261AE10C61F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total letters of credit and first priority liens with our counterparties</link:label>
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    <link:loc xlink:href="cpn-20190630.xsd#cpn_LettersofCreditIssuedandFirstPriorityLiensUnderPowerNaturalGasAndInterestRateHedgingInstruments" xlink:label="loc_cpn_LettersofCreditIssuedandFirstPriorityLiensUnderPowerNaturalGasAndInterestRateHedgingInstruments_4885295397804566C6223261AE10C61F" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SecurityDepositLiability_8B58EA4FBA4C3014FEEF3261AE1287E7_terseLabel_en-US" xlink:label="lab_us-gaap_SecurityDepositLiability_8B58EA4FBA4C3014FEEF3261AE1287E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Margin deposits held by us posted by our counterparties</link:label>
    <link:label id="lab_us-gaap_SecurityDepositLiability_8B58EA4FBA4C3014FEEF3261AE1287E7_label_en-US" xlink:label="lab_us-gaap_SecurityDepositLiability_8B58EA4FBA4C3014FEEF3261AE1287E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Deposit Liability</link:label>
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    <link:label id="lab_cpn_LettersOfCreditPostedByCounterparties_887C60D97132441575823261AE126DA5_terseLabel_en-US" xlink:label="lab_cpn_LettersOfCreditPostedByCounterparties_887C60D97132441575823261AE126DA5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Letters of credit posted with us by our counterparties</link:label>
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    <link:loc xlink:href="cpn-20190630.xsd#cpn_LettersOfCreditPostedByCounterparties" xlink:label="loc_cpn_LettersOfCreditPostedByCounterparties_887C60D97132441575823261AE126DA5" xlink:type="locator" />
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    <link:label id="lab_cpn_DerivativeCollateralObligationToReturnCashAndLettersOfCreditPostedByCounterparties_9479A4F5EE5416698F313261AE12D142_totalLabel_en-US" xlink:label="lab_cpn_DerivativeCollateralObligationToReturnCashAndLettersOfCreditPostedByCounterparties_9479A4F5EE5416698F313261AE12D142" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total margin deposits and letters of credit posted with us by our counterparties</link:label>
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    <link:label id="lab_us-gaap_LeaseCostTableTextBlock_ECFD9DC32AC53F348EAD3261AE2CCEB9_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_ECFD9DC32AC53F348EAD3261AE2CCEB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lease, Cost [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_InventoryNet_64CC7BE390441184A96B44919ED42044_label_en-US" xlink:label="lab_us-gaap_InventoryNet_64CC7BE390441184A96B44919ED42044" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
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    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_741E244D439B325B508244919ED4D679_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_741E244D439B325B508244919ED4D679" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense and Other Assets, Current</link:label>
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    <link:label id="lab_us-gaap_DerivativeAssetsCurrent_4FC9FA7F0A97F85B63C444919ED57BA8_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetsCurrent_4FC9FA7F0A97F85B63C444919ED57BA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Derivative assets, current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetsCurrent" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_4FC9FA7F0A97F85B63C444919ED57BA8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_D20397BF90AB29B8170F44919ED52BE1_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_D20397BF90AB29B8170F44919ED52BE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets held for sale</link:label>
    <link:label id="lab_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_D20397BF90AB29B8170F44919ED52BE1_label_en-US" xlink:label="lab_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_D20397BF90AB29B8170F44919ED52BE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets Held-for-sale, Not Part of Disposal Group, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_D20397BF90AB29B8170F44919ED52BE1" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherAssetsCurrent_C80EA99223DAE133AD7744919ED5E2E3_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_C80EA99223DAE133AD7744919ED5E2E3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current assets</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_C80EA99223DAE133AD7744919ED5E2E3_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_C80EA99223DAE133AD7744919ED5E2E3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_C80EA99223DAE133AD7744919ED5E2E3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AssetsCurrent_090686E4B4DF756309D944919ED5B884_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_090686E4B4DF756309D944919ED5B884" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_090686E4B4DF756309D944919ED5B884_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_090686E4B4DF756309D944919ED5B884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_090686E4B4DF756309D944919ED5B884" xlink:type="locator" />
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    <link:label id="lab_us-gaap_EquityMethodInvestments_19FE19DEC1820B3AFB6344919ED61BC4_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestments_19FE19DEC1820B3AFB6344919ED61BC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments in unconsolidated subsidiaries</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_19FE19DEC1820B3AFB6344919ED61BC4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Goodwill_A7C1C931F16F193E94D944919ED60E60_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_A7C1C931F16F193E94D944919ED60E60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_Goodwill_A7C1C931F16F193E94D944919ED60E60_label_en-US" xlink:label="lab_us-gaap_Goodwill_A7C1C931F16F193E94D944919ED60E60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_A7C1C931F16F193E94D944919ED60E60" xlink:type="locator" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_D5B6CFB1ECFF982182DD44919ED65E7E_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_D5B6CFB1ECFF982182DD44919ED65E7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_D5B6CFB1ECFF982182DD44919ED65E7E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Assets_C31DA2CAC8CA829909AA44919ED7C421_label_en-US" xlink:label="lab_us-gaap_Assets_C31DA2CAC8CA829909AA44919ED7C421" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_C31DA2CAC8CA829909AA44919ED7C421" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_01C762B6FC194A892D0944919ED77C26_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_01C762B6FC194A892D0944919ED77C26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
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    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_0BDA13251AB861BB66BC44919ED76884_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_0BDA13251AB861BB66BC44919ED76884" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_0BDA13251AB861BB66BC44919ED76884" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B1707B35CE8A808E1BEE44919EDAE625_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B1707B35CE8A808E1BEE44919EDAE625" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid in Capital, Common Stock</link:label>
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    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_F9D75777CDB42287D0AA44919EDA5EC5_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_F9D75777CDB42287D0AA44919EDA5EC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</link:label>
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    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9A3AC3C1C3CFF143B7A4531C9E522A82_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9A3AC3C1C3CFF143B7A4531C9E522A82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization(1)</link:label>
    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_9A3AC3C1C3CFF143B7A4531C9E522A82_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_9A3AC3C1C3CFF143B7A4531C9E522A82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation, Depletion and Amortization</link:label>
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    <link:label id="lab_us-gaap_UnrealizedGainLossOnDerivatives_9BBBBBA8083C96A8E66A531C9E520831_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_UnrealizedGainLossOnDerivatives_9BBBBBA8083C96A8E66A531C9E520831" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Mark-to-market activity, net</link:label>
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    <link:label id="lab_us-gaap_IncomeLossFromEquityMethodInvestments_7EC6A5AC124C7F2E8A62531C9E53BC44_negatedNetLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromEquityMethodInvestments_7EC6A5AC124C7F2E8A62531C9E53BC44" xlink:role="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="resource" xml:lang="en-US">(Income) from unconsolidated subsidiaries</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_22D2CB2441DC096A2607531C9E535A07_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_22D2CB2441DC096A2607531C9E535A07" 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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