v3.21.2

Nature of the business, Description (Details) - Algonquin [Member]	9 Months Ended
	Sep. 30, 2021
Nature of the business [Abstract]
Ownership interest	43.90%
Proportion of voting rights held by non-controlling interests	41.50%

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- References

No definition available.

+ Details

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Namespace Prefix:	aby_
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Period Type:	duration

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- Definition

The proportion of ownership interests in the entity held by non-controlling interests.

+ References

No definition available.

+ Details

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Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 12
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_d&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Period Type:	duration

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- Details

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