v3.21.1

Project debt, Details of project debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Project debt [Abstract] |  |
Cash held to satisfy non-recourse debt agreements | $ 311,000 | $ 280,000
Non-current | 4,519,942 | 4,925,268
Current | 680,275 | 312,346
Total Project debt | 5,200,217 | $ 5,237,614
Kaxu [Member] |  |
Project debt [Abstract] |  |
Current | $ 355,000 |

X
- Definition The amount of cash held to satisfy the customary requirements of certain non-recourse debt agreements. + References No definition available. + Details
Name: | aby_CashHeldForNonRecourseDebt
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of current project debt issued at the project level under project finance. + References No definition available. + Details
Name: | aby_CurrentProjectDebt
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current and non-current portions of project debt issued at the project level under project finance. + References No definition available. + Details
Name: | aby_LongTermAndShortTermProjectDebt
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current portion of non-current project debt issued at the project level under project finance. + References No definition available. + Details
Name: | aby_NoncurrentPortionOfNoncurrentProjectDebt
Namespace Prefix: | aby_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_KaxuMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |