Related parties (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Details of Balances [Abstract]
Credit receivables (current)	$ 20,101		$ 23,067
Credit receivables (non-current)	13,082		10,082
Total receivables from related parties	33,183		33,149
Credit payables (current)	22,888		18,477
Credit payables (non-current)	5,809		6,810
Total payables to related parties	28,698		25,287
Transactions with Related Party [Abstract]
Financial income	1,232	$ 5,673
Financial expenses	(189,524)	(210,113)
Kaxu, Solaben 2&3 and Solacor 1&2 [Member]
Details of Balances [Abstract]
Credit payables (non-current)	20,600		21,100
Arroyo Netherlands II B.V [Member]
Details of Balances [Abstract]
Credit receivables (current)	16,900		15,500
Algonquin [Member]
Details of Balances [Abstract]
Credit payables (current)	4,300		$ 4,200
Algerian Energy Company [Member]
Details of Balances [Abstract]
Credit payables (current)	3,800
Subsidiaries [Member]
Transactions with Related Party [Abstract]
Financial income	1,029	782
Financial expenses	$ (62)	$ (84)

No definition available.

Name:	aby_DetailsOfBalancesWithRelatedPartiesAbstract
Namespace Prefix:	aby_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of costs associated with financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 82
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_FinanceCosts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_FinanceIncome
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of non-current payables due to related parties. [Refer: Related parties [member]; Payables to related parties]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_NoncurrentPayablesToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current receivables due from related parties. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_NoncurrentReceivablesDueFromRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ifrs-full_RelatedPartyTransactionsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current receivables due from related parties. [Refer: Related parties [member]]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of payables due to related parties. [Refer: Related parties [member]]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherPayablesToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of receivables due from related parties. [Refer: Related parties [member]]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherReceivablesDueFromRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_KaxuSolaben23AndSolacor12Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=aby_ArroyoNetherlandsIIBVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=aby_AlgonquinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=aby_AlgerianEnergyCompanySPAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: