v3.24.1.u1
Financial information by segment, Assets and liabilities by business sector (Details)
$ in Thousands, € in Millions
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 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 $ 7,113,377 $ 7,204,267        
Investments carried under the equity method 225,732 230,307        
Other current financial assets 190,486 188,886        
Cash and cash equivalents (project companies) 452,129 448,301 $ 602,856     $ 600,990
Assets held for sale 29,136 28,642        
Total assets 8,709,042 8,714,333        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 4,301,128 4,319,260        
Grants and other liabilities 1,210,190 1,233,808        
Long-term and short-term corporate debt 1,173,680 1,084,838   $ 7,600 € 7  
Other non-current liabilities 44,094 44,489        
Total liabilities 7,170,220 7,125,524        
Equity 1,538,822 1,588,809 $ 1,709,829     $ 1,789,047
Total liabilities and equity 8,709,042 8,714,333        
Renewable Energy [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 5,729,867 5,798,818        
Investments carried under the equity method 183,870 189,672        
Other current financial assets 9,209 10,866        
Cash and cash equivalents (project companies) 286,002 299,987        
Assets held for sale 0 0        
Total assets 6,208,948 6,299,343        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 3,270,473 3,280,618        
Grants and other liabilities 1,161,838 1,185,487        
Total liabilities 4,432,311 4,466,105        
Efficient Natural Gas & Heat [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 446,626 460,766        
Investments carried under the equity method 0 0        
Other current financial assets 108,167 103,907        
Cash and cash equivalents (project companies) 25,617 35,098        
Assets held for sale 29,136 28,642        
Total assets 609,546 628,413        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 392,364 401,460        
Grants and other liabilities 32,630 32,916        
Total liabilities 424,994 434,376        
Transmission Lines [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 771,363 777,360        
Investments carried under the equity method 0 0        
Other current financial assets 30,950 30,746        
Cash and cash equivalents (project companies) 67,893 58,004        
Assets held for sale 0 0        
Total assets 870,206 866,110        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 566,387 560,906        
Grants and other liabilities 13,226 12,884        
Total liabilities 579,613 573,790        
Water [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 165,521 167,323        
Investments carried under the equity method 41,862 40,635        
Other current financial assets 42,160 43,367        
Cash and cash equivalents (project companies) 24,831 21,887        
Assets held for sale 0 0        
Total assets 274,374 273,212        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 71,904 76,276        
Grants and other liabilities 2,497 2,521        
Total liabilities 74,401 78,797        
Allocated [Member]            
Assets allocated [Abstract]            
Contracted concessional, PP&E and other intangible assets 7,113,377 7,204,267        
Investments carried under the equity method 225,732 230,307        
Other current financial assets 190,486 188,886        
Cash and cash equivalents (project companies) 404,343 414,976        
Assets held for sale 29,136 28,642        
Total assets 7,963,074 8,067,078        
Liabilities allocated [Abstract]            
Long-term and short-term project debt 4,301,128 4,319,260        
Grants and other liabilities 1,210,190 1,233,808        
Total liabilities 5,511,318 5,553,068        
Unallocated [Member]            
Assets allocated [Abstract]            
Other non-current assets 333,300 297,577        
Other current assets (including cash and cash equivalents at holding company level) 412,668 349,678        
Total assets 745,968 647,255        
Liabilities allocated [Abstract]            
Long-term and short-term corporate debt 1,173,680 1,084,838        
Other non-current liabilities 293,098 301,245        
Other current liabilities 192,124 186,373        
Total liabilities 1,658,902 1,572,456        
Equity 1,538,822 1,588,809        
Total liabilities and equity $ 3,197,724 $ 3,161,265