v3.8.0.1

Financial information by segment, Business sectors (Details) ft³ / d in Millions			12 Months Ended
	Jul. 20, 2017 MW	Feb. 28, 2017 mi	Dec. 31, 2017 ft³ / d WindFarm Plant Line SolarPlatform mi MW	Dec. 31, 2016 MW
Financial information by segment [Abstract]
Length of transmission lines | mi		114
Seville PV [Member]
Financial information by segment [Abstract]
Gross capacity				1
United States [Member] | Renewable Energy [Member] | Solana [Member]
Financial information by segment [Abstract]
Number of contracted assets | Plant			1
Gross capacity			280
United States [Member] | Renewable Energy [Member] | Mojave [Member]
Financial information by segment [Abstract]
Number of contracted assets | Plant			1
Gross capacity			280
Spain [Member] | Renewable Energy [Member]
Financial information by segment [Abstract]
Number of contracted assets | SolarPlatform			8
Spain [Member] | Renewable Energy [Member] | PS10/PS20 [Member]
Financial information by segment [Abstract]
Gross capacity			31
Spain [Member] | Renewable Energy [Member] | Solacor 1 and Solacor 2 [Member]
Financial information by segment [Abstract]
Gross capacity			100
Spain [Member] | Renewable Energy [Member] | Solaben 2 and 3 [Member]
Financial information by segment [Abstract]
Gross capacity			100
Spain [Member] | Renewable Energy [Member] | Helioenergy 1 and 2 [Member]
Financial information by segment [Abstract]
Gross capacity			100
Spain [Member] | Renewable Energy [Member] | Helios 1 and 2 [Member]
Financial information by segment [Abstract]
Gross capacity			100
Spain [Member] | Renewable Energy [Member] | Solnova 1, 3 and 4 [Member]
Financial information by segment [Abstract]
Gross capacity			150
Spain [Member] | Renewable Energy [Member] | Solaben 1 and 6 [Member]
Financial information by segment [Abstract]
Gross capacity			100
Spain [Member] | Renewable Energy [Member] | Seville PV [Member]
Financial information by segment [Abstract]
Gross capacity			1
South Africa [Member] | Renewable Energy [Member] | Kaxu [Member]
Financial information by segment [Abstract]
Number of contracted assets | Plant			1
Gross capacity			100
Uruguay [Member] | Renewable Energy [Member] | Palmatir [Member]
Financial information by segment [Abstract]
Number of contracted assets | WindFarm			1
Gross capacity			50
Uruguay [Member] | Renewable Energy [Member] | Cadonal [Member]
Financial information by segment [Abstract]
Number of contracted assets | WindFarm			1
Gross capacity			50
Mexico [Member] | Efficient Natural Gas [Member] | ACT [Member]
Financial information by segment [Abstract]
Gross capacity			300
Term of take-or-pay contract			20 years
Peru [Member]
Financial information by segment [Abstract]
Gross capacity	4
Peru [Member] | Electric Transmission [Member] | ATN, ATS and ATN2 [Member]
Financial information by segment [Abstract]
Number of contracted assets | Line			3
Length of transmission lines | mi			1,012
Chile [Member] | Electric Transmission [Member] | Quadra 1, Quadra 2, and Palmucho [Member]
Financial information by segment [Abstract]
Number of contracted assets | Line			3
Length of transmission lines | mi			87
Algeria [Member] | Water [Member] | Honaine and Skikda [Member]
Financial information by segment [Abstract]
Number of contracted assets | Plant			2
Aggregate capacity | ft³ / d			10.5

X

- Definition

The maximum, or rated, power generation capacity, in MW, of power facility or group of facilities, without adjusting for the facility's power parasitic consumption.

+ References

No definition available.

+ Details

Name:	aby_Capacity
Namespace Prefix:	aby_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate flow capacity of the entity's desalination facilities.

+ References

No definition available.

+ Details

Name:	aby_FlowCapacity
Namespace Prefix:	aby_
Data Type:	us-types:flowItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total span, length or measured distance of transmission lines.

+ References

No definition available.

+ Details

Name:	aby_LengthOfTransmissionLines
Namespace Prefix:	aby_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of contracted concessional assets included in the Company's portfolio.

+ References

No definition available.

+ Details

Name:	aby_NumberOfContractedConcessionalAssets
Namespace Prefix:	aby_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The term of a take-or-pay contract in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	aby_TakeOrPayContractTerm
Namespace Prefix:	aby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=aby_RenewableEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_ES
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=aby_PS10AndPS20Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Solacor1AndSolacor2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Solaben2AndSolaben3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Helioenergy1And2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Helios1And2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Solnova13And4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_Solaben1And6Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_ZA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_UY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=aby_EfficientNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=aby_ACTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_PE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=aby_ElectricTransmissionLinesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=aby_ATNATSAndATN2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_CL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=aby_Quadra1Quadra2AndPalmuchoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_DZ
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=aby_WaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=aby_HonaineAndSkikdaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: