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Investments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]        
ASSETS R$ 57,384,156 R$ 55,819,074    
Current assets 13,041,808 13,715,730    
Non-current assets 44,342,348 42,103,344    
LIABILITIES 57,384,156 55,819,074    
Current liabilities 10,342,380 9,309,433    
Non-current liabilities 21,404,841 22,317,974    
Equity 25,636,935 24,191,667 R$ 21,131,225 R$ 22,175,235
Net operating revenue 22,651,036 21,479,468 20,535,341  
OPERATING COSTS AND EXPENSES (18,867,990) (18,092,563) (17,254,583)  
Financial results (1,157,014) (1,204,990) (2,005,884)  
Income tax and social contribution 599,435 354,057 (281,099)  
NET INCOME 2,799,370 2,327,168 1,149,321  
Total comprehensive income 3,038,932 2,072,843 1,359,308  
Cash flows from operating activities 3,393,536 3,518,476 3,902,649  
Cash flows from investing activities (5,739,414) (3,135,091) (2,774,996)  
Cash flows from financing activities 803,856 2,696,572 (1,922,041)  
CHANGE IN CASH AND CASH EQUIVALENTS (1,542,022) 3,079,957 (794,388)  
Attributable to non-controlling interests (37,783) 305,514    
Gains (losses) on disposals of investments (299,199)      
Total for all subsidiaries [member]        
Disclosure of subsidiaries [line items]        
Attributable to non-controlling interests (37,783) 305,514 313,861  
Profit (loss), attributable to non-controlling interests (10,261) 68,358    
Other comprehensive income, attributable to non-controlling interests (142) (546)    
Dividends paid to non-controlling interests (33,695) (13,997)    
Distribution of dividends with retained earnings   (62,162)    
Gains (losses) on disposals of investments (299,199)      
Compagas [Member]        
Disclosure of subsidiaries [line items]        
Attributable to non-controlling interests 0 255,677 272,995  
Profit (loss), attributable to non-controlling interests 23,823 58,181    
Other comprehensive income, attributable to non-controlling interests 0 660    
Dividends paid to non-controlling interests (33,695) (13,997)    
Distribution of dividends with retained earnings   (62,162)    
Gains (losses) on disposals of investments (245,805)      
Elejor [Member]        
Disclosure of subsidiaries [line items]        
ASSETS 748,720 804,150    
Current assets 124,996 209,323    
Non-current assets 623,724 594,827    
LIABILITIES 748,720 804,150    
Current liabilities 114,110 109,350    
Non-current liabilities 760,550 730,939    
Equity (125,940) (36,139)    
Net operating revenue 91,418 140,757 194,287  
OPERATING COSTS AND EXPENSES (102,299) (92,793) (86,033)  
Financial results (124,476) (43,569) (113,102)  
Income tax and social contribution 46,029 (1,487) 4,158  
NET INCOME (89,328) 2,908 (690)  
Other comprehensive income (475) (4,206) 0  
Total comprehensive income (89,803) (1,298) (690)  
Cash flows from operating activities (58,715) (14,772) 45,249  
Cash flows from investing activities (10,747) (4,600) (7,364)  
Cash flows from financing activities 0 0 0  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS (69,462) (19,372) 37,885  
Cash and cash equivalents at the beginning of the year 166,544 185,916 148,031  
Cash and cash equivalents at the end of the year 97,082 166,544 185,916  
CHANGE IN CASH AND CASH EQUIVALENTS (69,462) (19,372) 37,885  
Attributable to non-controlling interests (37,783) (10,841) (10,451)  
Profit (loss), attributable to non-controlling interests (26,800) 873    
Other comprehensive income, attributable to non-controlling interests (142) (1,263)    
Dividends paid to non-controlling interests 0 0    
Distribution of dividends with retained earnings   0    
Gains (losses) on disposals of investments 0      
U E G Araucaria [Member]        
Disclosure of subsidiaries [line items]        
Attributable to non-controlling interests 0 60,678 R$ 51,317  
Profit (loss), attributable to non-controlling interests (7,284) 9,304    
Other comprehensive income, attributable to non-controlling interests 0 57    
Dividends paid to non-controlling interests 0 0    
Distribution of dividends with retained earnings   R$ 0    
Gains (losses) on disposals of investments R$ (53,394)