v3.19.2
Nature of the business, Concessional assets owned (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Sep. 30, 2013
ACT [Member]    
Nature of the business [Abstract]    
Type Efficient natural gas  
Ownership 100.00%  
Location Mexico  
Currency [1] USD  
Capacity (gross) 300 MW  
Counterparty credit ratings [2] BBB+/ Baa3/BBB-  
COD [3] 2013  
Contract years left [4] 14 years  
ATN [Member]    
Nature of the business [Abstract]    
Type [5] Transmission line  
Ownership [5] 100.00%  
Location [5] Peru  
Currency [1],[5] USD  
Capacity (gross) [5] 365 miles  
Counterparty credit ratings [2],[5] BBB+/A3/BBB+  
COD [3],[5] 2011  
Contract years left [4],[5] 22 years  
ATS [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Peru  
Currency [1] USD  
Capacity (gross) 569 miles  
Counterparty credit ratings [2] BBB+/A3/BBB+  
COD [3] 2014  
Contract years left [4] 25 years  
ATN2 [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Peru  
Currency [1] USD  
Capacity (gross) 81 miles  
Counterparty credit ratings [2] Not rated  
COD [3] 2015  
Contract years left [4] 14 years  
Quadra 1 [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Chile  
Currency [1] USD  
Capacity (gross) 49 miles  
Counterparty credit ratings [2] Not rated  
COD [3] 2014  
Contract years left [4] 16 years  
Quadra 2 [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Chile  
Currency [1] USD  
Capacity (gross) 32 miles  
Counterparty credit ratings [2] Not rated  
COD [3] 2014  
Contract years left [4] 16 years  
Palmucho [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Chile  
Currency [1] USD  
Capacity (gross) 6 miles  
Counterparty credit ratings [2] BBB+/Baa1/BBB+  
COD [3] 2007  
Contract years left [4] 19 years  
Chile TL3 [Member]    
Nature of the business [Abstract]    
Type Transmission line  
Ownership 100.00%  
Location Chile  
Currency [1] USD  
Capacity (gross) 50 miles  
Counterparty credit ratings [2] A+/A1/A+  
COD [3] 1993  
Skikda [Member]    
Nature of the business [Abstract]    
Type Water  
Ownership [6] 34.20%  
Location Algeria  
Currency [1] USD  
Capacity (gross) 3.5 M ft3/day  
Counterparty credit ratings [2] Not rated  
COD [3] 2009  
Contract years left [4] 15 years  
Skikda [Member] | Algerian Energy Company, SPA [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 49.00%  
Skikda [Member] | Sadyt [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 16.83%  
Honaine [Member]    
Nature of the business [Abstract]    
Type Water  
Ownership [7] 25.50%  
Location Algeria  
Currency [1] USD  
Capacity (gross) 7 M ft3/day  
Counterparty credit ratings [2] Not rated  
COD [3] 2012  
Contract years left [4] 19 years  
Honaine [Member] | Algerian Energy Company, SPA [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 49.00%  
Honaine [Member] | Sadyt [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 25.50%  
PS10/PS20 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 31 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2007& 2009  
PS10 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 13 years  
PS20 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 15 years  
Solana [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Ownership interest type [8] Class B  
Location Arizona (USA)  
Currency [1] USD  
Capacity (gross) 280 MW  
Counterparty credit ratings [2] A-/A2/A-  
COD [3] 2013  
Contract years left [4] 25 years  
Solana [Member] | Liberty Interactive Corporation [Member]    
Nature of the business [Abstract]    
Class A membership investment   $ 300
Mojave [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location California (USA)  
Currency [1] USD  
Capacity (gross) 280 MW  
Counterparty credit ratings [2] D/WR/WD  
COD [3] 2014  
Contract years left [4] 21 years  
Solaben 2 & 3 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership [9] 70.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 2x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2012  
Solaben 2 & 3 [Member] | Itochu Corporation [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 30.00%  
Solaben 2 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 19 years  
Solaben 3 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 18 years  
Solacor 1 & 2 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership [10] 87.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 2x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2012  
Solacor 1 & 2 [Member] | JGC [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 13.00%  
Solacor 1 [Member]    
Nature of the business [Abstract]    
Contract years left 18 years  
Solacor 2 [Member]    
Nature of the business [Abstract]    
Contract years left 18 years  
Helioenergy 1 & 2 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 2x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2011  
Helioenergy 1 [Member]    
Nature of the business [Abstract]    
Contract years left 18 years  
Helioenergy 2 [Member]    
Nature of the business [Abstract]    
Contract years left 18 years  
Helios 1 & 2 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 2x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2012  
Helios 1 [Member]    
Nature of the business [Abstract]    
Contract years left 19 years  
Helios 2 [Member]    
Nature of the business [Abstract]    
Contract years left 19 years  
Solnova 1, 3 & 4 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 3x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2010  
Solnova 1 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 16 years  
Solnova 3 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 16 years  
Solnova 4 [Member]    
Nature of the business [Abstract]    
Contract years left [4] 17 years  
Solaben 1 & 6 [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership 100.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 2x50 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2013  
Solaben 1 [Member]    
Nature of the business [Abstract]    
Contract years left 20 years  
Solaben 6 [Member]    
Nature of the business [Abstract]    
Contract years left 20 years  
Seville PV [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership [11] 80.00%  
Location Spain  
Currency [1] Euro  
Capacity (gross) 1 MW  
Counterparty credit ratings [2] A-/Baa1/A-  
COD [3] 2006  
Contract years left [4] 17 years  
Seville PV [Member] | Idae [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 20.00%  
Kaxu [Member]    
Nature of the business [Abstract]    
Type Renewable (Solar)  
Ownership [12] 51.00%  
Location South Africa  
Currency [1] Rand  
Capacity (gross) 100 MW  
Counterparty credit ratings [2],[13] BB/Baa3/BB-  
COD [3] 2015  
Contract years left [4] 16 years  
Kaxu [Member] | IDC [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 29.00%  
Kaxu [Member] | Kaxu Community Trust [Member]    
Nature of the business [Abstract]    
Percentage of non-controlling interests 20.00%  
Palmatir [Member]    
Nature of the business [Abstract]    
Type Renewable (Wind)  
Ownership 100.00%  
Location Uruguay  
Currency [1] USD  
Capacity (gross) 50 MW  
Counterparty credit ratings [2],[14] BBB/Baa2/BBB-  
COD [3] 2014  
Contract years left [4] 15 years  
Cadonal [Member]    
Nature of the business [Abstract]    
Type Renewable (Wind)  
Ownership 100.00%  
Location Uruguay  
Currency [1] USD  
Capacity (gross) 50 MW  
Counterparty credit ratings [2],[14] BBB/Baa2/BBB-  
COD [3] 2014  
Contract years left [4] 16 years  
Melowind [Member]    
Nature of the business [Abstract]    
Type Renewable (Wind)  
Ownership 100.00%  
Location Uruguay  
Currency [1] USD  
Capacity (gross) 50MW  
Counterparty credit ratings [2] BBB/Baa2/BBB-  
COD [3] 2015  
Contract years left [4] 17 years  
Mini-Hydro [Member]    
Nature of the business [Abstract]    
Type Renewable (Hydraulic)  
Ownership 100.00%  
Location Peru  
Currency [1] USD  
Capacity (gross) 4 MW  
Counterparty credit ratings [2] BBB+/A3/ BBB+  
COD [3] 2012  
Contract years left [4] 14 years  
[1] Certain contracts denominated in U.S. dollars are payable in local currency.
[2] Reflects the counterparty's credit ratings issued by Standard & Poor's Ratings Services, or S&P, Moody's Investors Service Inc., or Moody's, and Fitch Ratings Ltd, or Fitch.
[3] Commercial Operation Date.
[4] As of December 31, 2018.
[5] Including the acquisition of ATN expansion 1.
[6] Algerian Energy Company, SPA owns 49% of Skikda and Sacyr Agua, S.L. owns the remaining 16.83%.
[7] Algerian Energy Company, SPA owns 49% of Honaine and Sacyr Agua, S.L. owns the remaining 25.5%.
[8] On September 30, 2013, Liberty Interactive Corporation agreed to invest $300 million in Class A shares of ASO Holdings Company LLC, the holding company of Solana, in exchange for a share of the dividends and the taxable losses generated by Solana.
[9] Itochu Corporation, a Japanese trading company, holds 30% of the shares in each of Solaben 2 and Solaben 3.
[10] JGC, a Japanese engineering company, holds 13% of the shares in each of Solacor 1 and Solacor 2.
[11] Instituto para la Diversificacion y Ahorro de la Energia ("Idae"), a Spanish state owned company, holds 20% of the shares in Seville PV.
[12] Kaxu is owned by the Company (51%), Industrial Development Corporation of South Africa (29%) and Kaxu Community Trust (20%).
[13] Refers to the credit rating of the Republic of South Africa. The offtaker is Eskom, which is a state-owned utility company in South Africa.
[14] Refers to the credit rating of Uruguay, as UTE (Administracion Nacional de Usinas y Transmisoras Electricas) is unrated.