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Nature of the business, Concessional assets owned (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nature of the business [Abstract]      
Ownership   49.00% 49.00%
ACT [Member]      
Nature of the business [Abstract]      
Type Efficient natural gas & heat    
Ownership 100.00%    
Location Mexico    
Currency [1] USD    
Capacity (gross) 300 MW    
Counterparty credit ratings [2] BBB/B3/B+    
COD [3] 2013    
Contract years remaining [4] 9 years    
Monterrey [Member]      
Nature of the business [Abstract]      
Type [5] Efficient natural gas &heat    
Ownership [5] 30.00%    
Location [5] Mexico    
Currency [1],[5] USD    
Capacity (gross) [5] 142 MW    
Counterparty credit ratings [2],[5] Not rated    
COD [3],[5] 2018    
Contract years remaining [4],[5] 22 years    
ATN [Member]      
Nature of the business [Abstract]      
Type [6] Transmission line    
Ownership [6] 100.00%    
Location [6] Peru    
Currency [1],[6] USD    
Capacity (gross) [6] 379 miles    
Counterparty credit ratings [2],[6] BBB/Baa1/BBB    
COD [3],[6] 2011    
Contract years remaining [4],[6] 17 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/Baa1/BBB    
COD [3] 2014    
Contract years remaining [4] 20 years    
ATN 2 [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 remaining [4] 9 years    
Quadra 1 & 2 [Member]      
Nature of the business [Abstract]      
Type Transmission line    
Ownership 100.00%    
Location Chile    
Currency [1] USD    
Capacity (gross) 49 miles/32 miles    
Counterparty credit ratings [2] Not rated    
COD [3] 2014    
Quadra 1 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 11 years    
Quadra 2 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 11 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/ -- /BBB+    
COD [3] 2007    
Contract years remaining [4] 14 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/A2/A-    
COD [3] 1993    
Chile TL4 [Member]      
Nature of the business [Abstract]      
Type Transmission line    
Ownership 100.00%    
Location Chile    
Currency [1] USD    
Capacity (gross) 63 miles    
Counterparty credit ratings [2] Not rated    
COD [3] 2016    
Contract years remaining [4] 48 years    
Skikda [Member]      
Nature of the business [Abstract]      
Type Water    
Ownership [7] 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 remaining [4] 10 years    
Skikda [Member] | Algerian Energy Company, SPA [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 49.00%    
Skikda [Member] | Sacyr Agua S.L. [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 16.80%    
Honaine [Member]      
Nature of the business [Abstract]      
Type Water    
Ownership [8] 25.50%    
Location Algeria    
Currency [1] USD    
Capacity (gross) 7 M ft3/day    
Counterparty credit ratings [2] Not rated    
COD [3] 2012    
Contract years remaining [4] 14 years    
Honaine [Member] | Algerian Energy Company, SPA [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 49.00%    
Honaine [Member] | Sacyr Agua S.L. [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 25.50%    
Tenes [Member]      
Nature of the business [Abstract]      
Type Water    
Ownership [9] 51.00%    
Location Algeria    
Currency [1] USD    
Capacity (gross) 7 M ft3/day    
Counterparty credit ratings [2] Not rated    
COD [3] 2015    
Contract years remaining [4] 16 years    
Tenes [Member] | Algerian Energy Company, SPA [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 49.00%    
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 remaining [4] 8 years    
PS20 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 10 years    
Solana [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Arizona (USA)    
Currency [1] USD    
Capacity (gross) 280 MW    
Counterparty credit ratings [2] BBB+/A3/BBB+    
COD [3] 2013    
Contract years remaining [4] 20 years    
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] BB/ Ba1/BB+    
COD [3] 2014    
Contract years remaining [4] 16 years    
Coso [Member]      
Nature of the business [Abstract]      
Type Renewable (Geothermal)    
Ownership 100.00%    
Location California (USA)    
Currency [1] USD    
Capacity (gross) 135 MW    
Counterparty credit ratings [2],[10] Investment Grade    
COD [3] 1987-1989    
Contract years remaining [4] 18 years    
Elkhorn Valley [Member]      
Nature of the business [Abstract]      
Type [11] Renewable (Wind)    
Ownership [11] 49.00%    
Location [11] Oregon (USA)    
Currency [1],[11] USD    
Capacity (gross) [11] 101 MW    
Counterparty credit ratings [2],[11] BBB/Baa1/--    
COD [3],[11] 2007    
Contract years remaining [4],[11] 4 years    
Prairie Star [Member]      
Nature of the business [Abstract]      
Type [11] Renewable (Wind)    
Ownership [11] 49.00%    
Location [11] Minnesota (USA)    
Currency [1],[11] USD    
Capacity (gross) [11] 101 MW    
Counterparty credit ratings [2],[11] --/A3/A-    
COD [3],[11] 2007    
Contract years remaining [4],[11] 4 years    
Twin Groves II [Member]      
Nature of the business [Abstract]      
Type [11] Renewable (Wind)    
Ownership [11] 49.00%    
Location [11] Illinois (USA)    
Currency [1],[11] USD    
Capacity (gross) [11] 198 MW    
Counterparty credit ratings [2],[11] BB+/Baa2/--    
COD [3],[11] 2008    
Contract years remaining [4],[11] 2 years    
Lone Star II [Member]      
Nature of the business [Abstract]      
Type [11] Renewable (Wind)    
Ownership [11] 49.00%    
Location [11] Texas (USA)    
Currency [1],[11] USD    
Capacity (gross) [11] 196 MW    
Counterparty credit ratings [2],[11] N/A    
COD [3],[11] 2008    
Chile PV I [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [12] 35.00%    
Location Chile    
Currency [1] USD    
Capacity (gross) 55 MW    
Counterparty credit ratings [2] N/A    
COD [3] 2016    
Percentage of non-controlling interests 65.00%    
Chile PV2 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [12] 35.00%    
Location Chile    
Currency [1] USD    
Capacity (gross) 40 MW    
Counterparty credit ratings [2] Not rated    
COD [3] 2017    
Contract years remaining [4] 7 years    
Percentage of non-controlling interests 65.00%    
Chile PV 3 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [12] 35.00%    
Location Chile    
Currency [1] USD    
Capacity (gross) 73 MW    
Counterparty credit ratings [2] N/A    
COD [3] 2014    
Percentage of non-controlling interests 65.00%    
La Sierpe [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Colombia    
Currency [1] COP    
Capacity (gross) 20 MW    
Counterparty credit ratings [2] Not rated    
COD [3] 2021    
Contract years remaining [4] 12 years    
La Tolua [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Colombia    
Currency [1] COP    
Capacity (gross) 20 MW    
Counterparty credit ratings [2] Not rated    
COD [3] 2023    
Contract years remaining [4] 9 years    
Tierra Linda [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Colombia    
Currency [1] COP    
Capacity (gross) 10 MW    
Counterparty credit ratings [2] Not rated    
COD [3] 2023    
Contract years remaining [4] 9 years    
Honda 1 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 50.00%    
Location Colombia    
Currency [1] COP    
Capacity (gross) 10 MW    
Counterparty credit ratings [2] BBB-/-/BBB    
COD [3] 2023    
Contract years remaining [4] 7 years    
Albisu [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Uruguay    
Currency [1] UYU    
Capacity (gross) 10 MW    
Counterparty credit ratings [2] Not rated    
COD [3] 2023    
Contract years remaining [4] 15 years    
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],[13] BBB+/Baa2/BBB    
COD [3] 2014    
Contract years remaining [4] 10 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],[13] BBB+/Baa2/BBB    
COD [3] 2014    
Contract years remaining [4] 11 years    
Melowind [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],[13] BBB+/Baa2/BBB    
COD [3] 2015    
Contract years remaining [4] 12 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/Baa1/BBB    
COD [3] 2012    
Contract years remaining [4] 9 years    
Solaben 2 & 3 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [14] 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 remaining [4] 14 years    
Solaben 3 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 14 years    
Solacor 1 & 2 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [15] 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 remaining [4] 13 years    
Solacor 2 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 13 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 remaining [4] 13 years    
Helioenergy 2 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 13 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 remaining [4] 13 years    
Helios 2 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 14 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 remaining [4] 11 years    
Solnova 3 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 11 years    
Solnova 4 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 12 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 remaining [4] 15 years    
Solaben 6 [Member]      
Nature of the business [Abstract]      
Contract years remaining [4] 15 years    
Seville PV [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [16] 80.00%    
Location Spain    
Currency [1] Euro    
Capacity (gross) 1 MW    
Counterparty credit ratings [2] A/Baa1/A-    
COD [3] 2006    
Contract years remaining [4] 12 years    
Seville PV [Member] | Idae [Member]      
Nature of the business [Abstract]      
Percentage of non-controlling interests 20.00%    
Italy PV 1 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Italy    
Currency [1] Euro    
Capacity (gross) 1.6 MW    
Counterparty credit ratings [2] BBB/Baa3/BBB    
COD [3] 2010    
Contract years remaining [4] 8 years    
Italy PV 2 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Italy    
Currency [1] Euro    
Capacity (gross) 2.1 MW    
Counterparty credit ratings [2] BBB/Baa3/BBB    
COD [3] 2011    
Contract years remaining [4] 8 years    
Italy PV 3 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Italy    
Currency [1] Euro    
Capacity (gross) 2.5 MW    
Counterparty credit ratings [2] BBB/Baa3/BBB    
COD [3] 2012    
Contract years remaining [4] 8 years    
Italy PV 4 [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership 100.00%    
Location Italy    
Currency [1] Euro    
Capacity (gross) 3.6 MW    
Counterparty credit ratings [2] BBB/Baa3/BBB    
COD [3] 2011    
Contract years remaining [4] 8 years    
Kaxu [Member]      
Nature of the business [Abstract]      
Type Renewable (Solar)    
Ownership [17] 51.00%    
Location South Africa    
Currency [1] Rand    
Capacity (gross) 100 MW    
Counterparty credit ratings [2],[18] BB-/Ba2/BB-    
COD [3] 2015    
Contract years remaining [4] 11 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%    
Calgary [Member]      
Nature of the business [Abstract]      
Type Efficient natural gas &heat    
Ownership 100.00%    
Location Canada    
Currency [1] CAD    
Capacity (gross) 55 MWt    
Counterparty credit ratings [2],[19] ~60% AA- or higher    
COD [3] 2010    
Contract years remaining [4] 12 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. Not applicable (“N/A”) when the asset has no PPA.
[3] Commercial Operation Date.
[4] As of December 31, 2023.
[5] Accounted for as held for sale as of December 31, 2023.
[6] Including ATN Expansion 1 & 2.
[7] Algerian Energy Company, SPA owns 49% of Skikda and Sacyr Agua, S.L. owns the remaining 16.8%.
[8] Algerian Energy Company, SPA owns 49% of Honaine and Sacyr Agua, S.L. owns the remaining 25.5%.
[9] Algerian Energy Company, SPA owns 49% of Tenes. The Company has an investment in Tenes through a secured loan to Befesa Agua Tenes (the holding company of Tenes) and the right to appoint a majority at the board of directors of the project company. Therefore, the Company controls Tenes since May 31, 2020, and fully consolidates the asset from that date.
[10] Refers to the credit rating of two Community Choice Aggregators: Silicon Valley Clean Energy and Monterrey Bar Community Power, both with A Rating from S&P and Southern California Public Power Authority. The third off-taker is not rated.
[11] Part of Vento II Portfolio.
[12] 65% of the shares in Chile PV 1, Chile PV 2 and Chile PV 3 are indirectly held by financial partners through the renewable energy platform of the Company in Chile.
[13] Refers to the credit rating of Uruguay, as UTE (Administración Nacional de Usinas y Transmisoras Eléctricas) is unrated.
[14] Itochu Corporation holds 30% of the shares in each of Solaben 2 and Solaben 3.
[15] JGC holds 13% of the shares in each of Solacor 1 and Solacor 2.
[16] Instituto para la Diversificación y Ahorro de la Energía (“Idae”) holds 20% of the shares in Seville PV.
[17] Kaxu is owned by the Company (51%), Industrial Development Corporation of South Africa (“IDC”, 29%) and Kaxu Community Trust (20%).
[18] Refers to the credit rating of the Republic of South Africa. The off-taker is Eskom, which is a state-owned utility company in South Africa.
[19] Refers to the credit rating of a diversified mix of 22 high credit quality clients (~60% AA- rating or higher, the rest is unrated).