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Investments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
ASSETS R$ 55,819,074 R$ 49,703,700    
Current assets 13,715,730 9,327,249    
Noncurrent assets 42,103,344 40,376,451    
LIABILITIES 55,819,074 49,703,700    
Current liabilities 9,309,433 7,156,597    
Noncurrent liabilities 22,317,974 21,415,878    
Equity 24,191,667 21,131,225 R$ 22,175,235 R$ 20,250,518
Net operating revenue 21,479,468 20,535,341 20,976,216  
Operating costs and expenses (18,092,563) (17,254,583) (16,415,740)  
Financial results (1,204,990) (2,005,884) (346,365)  
Income tax and social contribution 354,057 (281,099) 1,178,524  
Net income (loss) 2,327,168 1,149,321 5,048,602  
Total comprehensive income 2,072,843 1,359,308 5,201,347  
Cash flows from operating activities 3,518,476 3,902,649 3,386,832  
Cash flows from investing activities (3,135,091) (2,774,996) 31,908  
Cash flows from financing activities 2,696,572 (1,922,041) (2,884,427)  
CHANGE IN CASH AND CASH EQUIVALENTS 3,079,957 (794,388) 534,313  
Compagas [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,023,624 1,083,713    
Current assets 240,017 282,714    
Noncurrent assets 783,607 800,999    
LIABILITIES 1,023,624 1,083,713    
Current liabilities 206,137 419,277    
Noncurrent liabilities 302,821 107,306    
Equity 514,666 557,130    
Net operating revenue 978,581 1,297,034 783,277  
Operating costs and expenses (814,455) (1,076,181) (654,643)  
Financial results (11,757) 28,440 9,817  
Income tax and social contribution (40,750) (70,092) (38,860)  
Net income (loss) 111,619 179,201 99,591  
Other comprehensive income 1,346 1,433 294  
Total comprehensive income 112,965 180,634 99,885  
Cash flows from operating activities 185,558 280,480 178,800  
Cash flows from investing activities (27,807) (427,175) (14,273)  
Cash flows from financing activities (117,373) (2,887) (64,545)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 40,378 (149,582) 99,982  
Cash and cash equivalents at the beginning of the year 61,059 210,641 110,659  
Cash and cash equivalents at the end of the year 101,437 61,059 210,641  
CHANGE IN CASH AND CASH EQUIVALENTS 40,378 (149,582) 99,982  
Elejor [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 804,150 848,198    
Current assets 209,323 224,833    
Noncurrent assets 594,827 623,365    
LIABILITIES 804,150 848,198    
Current liabilities 109,350 111,142    
Noncurrent liabilities 730,939 771,897    
Equity (36,139) (34,841)    
Net operating revenue 140,757 194,287 171,263  
Operating costs and expenses (92,793) (86,033) (86,871)  
Financial results (43,569) (113,102) (171,888)  
Income tax and social contribution (1,487) 4,158 33,061  
Net income (loss) 2,908 (690) (54,435)  
Other comprehensive income (4,206)  
Total comprehensive income (1,298) (690) (54,435)  
Cash flows from operating activities (14,772) 45,249 127,510  
Cash flows from investing activities (4,600) (7,364) (31,095)  
Cash flows from financing activities  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS (19,372) 37,885 96,415  
Cash and cash equivalents at the beginning of the year 185,916 148,031 51,616  
Cash and cash equivalents at the end of the year 166,544 185,916 148,031  
CHANGE IN CASH AND CASH EQUIVALENTS (19,372) 37,885 96,415  
U E G Araucaria [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 423,367 334,418    
Current assets 36,580 97,586    
Noncurrent assets 386,787 236,832    
LIABILITIES 423,367 334,418    
Current liabilities 49,797 45,115    
Noncurrent liabilities 55,959 16,322    
Equity 317,611 272,981    
Net operating revenue 98,508 2,250,577  
Operating costs and expenses 4,674 (365,522) (1,879,198)  
Financial results 2,856 11,407 8,952  
Income tax and social contribution 36,795 (11,885) (42,248)  
Net income (loss) 44,325 (267,492) 338,083  
Other comprehensive income 304  
Total comprehensive income 44,629 (267,492) 338,083  
Cash flows from operating activities (67,767) (94,401) 312,676  
Cash flows from investing activities (9,870) (139,033) (14,579)  
Cash flows from financing activities 35,000 (147) (64,331)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS (42,637) (233,581) 233,766  
Cash and cash equivalents at the beginning of the year 64,991 298,572 64,806  
Cash and cash equivalents at the end of the year 22,354 64,991 298,572  
CHANGE IN CASH AND CASH EQUIVALENTS R$ (42,637) R$ (233,581) R$ 233,766