v3.24.2.u1
Financial information by segment, Assets and liabilities by business sector (Details)
$ in Thousands, € in Millions
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Feb. 24, 2023
USD ($)
Feb. 24, 2023
EUR (€)
Dec. 31, 2022
USD ($)
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets $ 7,065,132 $ 7,204,267        
Investments carried under the equity method 221,558 230,307        
Other current financial assets 190,543 183,897        
Cash and cash equivalents (project companies) 355,529 448,301 $ 486,844     $ 600,990
Assets held for sale 0 28,642        
Total assets 8,536,255 8,714,333        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 4,163,924 4,319,260        
Grants and other liabilities 1,161,840 1,233,808        
Long-term and short-term corporate debt 1,192,107 1,084,838   $ 7,500 € 7  
Other non-current liabilities 44,763 44,489        
Total liabilities 7,038,683 7,125,524        
Equity 1,497,572 1,588,809 $ 1,707,761     $ 1,789,047
Total liabilities and equity 8,536,255 8,714,333        
Renewable Energy [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 5,693,192 5,798,818        
Investments carried under the equity method 178,367 189,672        
Other current financial assets 8,582 10,866        
Cash and cash equivalents (project companies) 235,837 299,987        
Assets held for sale   0        
Total assets 6,115,978 6,299,343        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 3,162,041 3,280,618        
Grants and other liabilities 1,113,131 1,185,487        
Total liabilities 4,275,172 4,466,105        
Efficient Natural Gas & Heat [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 441,891 460,766        
Investments carried under the equity method 0 0        
Other current financial assets 112,074 103,907        
Cash and cash equivalents (project companies) 19,553 35,098        
Assets held for sale   28,642        
Total assets 573,518 628,413        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 383,424 401,460        
Grants and other liabilities 33,329 32,916        
Total liabilities 416,753 434,376        
Transmission Lines [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 764,213 777,360        
Investments carried under the equity method 0 0        
Other current financial assets 31,082 30,746        
Cash and cash equivalents (project companies) 51,856 58,004        
Assets held for sale   0        
Total assets 847,151 866,110        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 549,889 560,906        
Grants and other liabilities 12,884 12,884        
Total liabilities 562,773 573,790        
Water [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 165,836 167,323        
Investments carried under the equity method 43,191 40,635        
Other current financial assets 42,489 43,367        
Cash and cash equivalents (project companies) 27,755 21,887        
Assets held for sale   0        
Total assets 279,271 273,212        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 68,570 76,276        
Grants and other liabilities 2,496 2,521        
Total liabilities 71,066 78,797        
Allocated [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 7,065,132 7,204,267        
Investments carried under the equity method 221,558 230,307        
Other current financial assets 194,227 188,886        
Cash and cash equivalents (project companies) 335,001 414,976        
Assets held for sale   28,642        
Total assets 7,815,918 8,067,078        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 4,163,924 4,319,260        
Grants and other liabilities 1,161,840 1,233,808        
Total liabilities 5,325,764 5,553,068        
Unallocated [Member]            
Assets allocated [Abstract]            
Other non-current assets 329,483 297,577        
Other current assets (including cash and cash equivalents at holding company level) 390,854 349,678        
Total assets 720,337 647,255        
Liabilities allocated [Abstract]            
Long-term and short-term corporate debt 1,192,107 1,084,838        
Other non-current liabilities 304,722 301,245        
Other current liabilities 216,090 186,373        
Total liabilities 1,712,919 1,572,456        
Equity 1,497,572 1,588,809        
Total liabilities and equity $ 3,210,491 $ 3,161,265