XML 113 R85.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Significant Events - Investment in and Acquisition by TransAlta Renewables of the Canadian Assets (Details) | Nov. 09, 2017 CAD | Jan. 06, 2016 CAD shares CAD / shares MW | Dec. 31, 2016 shares | Nov. 30, 2016 CAD | Mar. 17, 2016 shares | Dec. 31, 2015 shares
--- | --- | --- | --- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Number of shares issued | shares |  |  | 38,600,000 |  | 1,824,620.00 | 38,600,000
Transfer of equity from non-controlling interests |  |  |  | CAD 38,000,000 |  |
TransAlta Renewables | Canadian Assets |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Aggregate value of business combination |  | CAD 540,000,000 |  | 520,000,000 |  |
Capacity of facility (in megawatts) | MW |  | 611 |  |  |  |
Cash paid |  | CAD 173,000,000 |  |  |  |
Common shares issued (in shares) | shares |  | 15,640,583 |  |  |  |
Value of common shares issued |  | CAD 152,000,000 |  |  |  |
Subscription receipts (in shares) | shares |  | 17,692,750 |  |  |  |
Price per subscription receipt |  | CAD 9.75 |  |  |  |
Number of shares received per subscription receipt (in shares) | shares |  | 1 |  |  |  |
Dividend per subscription receipt (in CAD per share) | CAD / shares |  | CAD 0.07 |  |  |  |
Number of shares issued | shares |  | 17,692,750 |  |  |  |
Dividends paid, ordinary shares |  | CAD 1,000,000 |  |  |  |
Share issue related cost |  | 8,000,000 |  |  |  |
Effect of share issuance cost on income cost |  | 2,000,000 |  |  |  |
Working capital and certain capital spares acquired |  |  |  | CAD 19,000,000 |  |
Convertible unsecured debenture | TransAlta Renewables | Canadian Assets |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Convertible senior subordinated debenture issued |  | CAD 215,000,000 |  |  |  |
Repayments of bonds, notes and debentures | CAD 218,000,000 |  |  |  |  |
Payment of accrued interest | CAD 3,000,000 |  |  |  |  |

X
- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
Name: | ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
Name: | ifrs-full_CashTransferred
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfBusinessCombinationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2017-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2017-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DividendsPaidOrdinaryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2017-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2017-03-01&anchor=para_16A_f&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DividendsPaidOrdinarySharesPerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
Name: | ifrs-full_EquityInterestsOfAcquirer
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of notes and debentures issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NotesAndDebenturesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph f -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow for repayments of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_RepaymentsOfBondsNotesAndDebentures
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of cost related to the issuance of shares. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ShareIssueRelatedCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Capacity Of Generation Units, Power + References No definition available. + Details
Name: | tac_CapacityOfPowerGenerationAssetsPower
Namespace Prefix: | tac_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Stock Subscriptions Issued, Shares + References No definition available. + Details
Name: | tac_CommonStockSubscriptionsIssuedShares
Namespace Prefix: | tac_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Shares Received Per Common Share Subscription Receipt + References No definition available. + Details
Name: | tac_NumberOfSharesReceivedPerCommonShareSubscriptionReceipt
Namespace Prefix: | tac_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payment of accrued interest + References No definition available. + Details
Name: | tac_Paymentofaccruedinterest
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Price Per Common Stock Subscription Receipt + References No definition available. + Details
Name: | tac_PricePerCommonStockSubscriptionReceipt
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Share Issue Related Cost, Effect Of Income Tax Recovery + References No definition available. + Details
Name: | tac_ShareIssueRelatedCostEffectOnIncomeTaxRecovery
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Transfer Of Equity From Non-Controlling Interests + References No definition available. + Details
Name: | tac_TransferOfEquityFromNonControllingInterests
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Working Capital And Capital Spares Acquired + References No definition available. + Details
Name: | tac_WorkingCapitalAndCapitalSparesAcquired
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=tac_TransAltaRenewablesInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=tac_SarniaCogenerationPlantLeNordaisWindFarmAndRaggedChuteHydroFacilityCanadianAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=tac_ConvertibleUnsecuredSubordinatedDebentureDueDecember2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |