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Investments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]        
Assets R$ 49,703,700 R$ 49,537,535    
Current assets 9,327,249 11,189,872    
Non-current assets 40,376,451 38,347,663    
Current liabilities 7,156,597 7,979,993    
Non-current liabilities 21,415,878 19,382,307    
Equity 21,131,225 22,175,235 R$ 20,250,518 R$ 17,598,212
Operating expense (16,928,407) (19,119,637) (13,347,822)  
Finance income (cost) (1,966,037) (327,361) 866,271  
Tax expense (income) (199,122) 1,259,632 1,285,365  
NET INCOME 1,149,321 5,048,602 3,909,750  
Comprehensive income 1,359,308 5,201,347 3,730,595  
Cash flows from (used in) operating activities 3,902,649 3,386,832 3,940,844  
Cash flows from (used in) investing activities (2,774,996) 31,908 (1,667,571)  
Cash flows from (used in) financing activities (1,922,041) (2,884,427) (1,715,113)  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes (794,388) 534,313 558,160  
Compagas [Member]        
IfrsStatementLineItems [Line Items]        
Assets 1,083,713 827,901    
Current assets 282,714 355,500    
Non-current assets 800,999 472,401    
Liabilities 1,083,713 827,901    
Current liabilities 419,277 220,216    
Non-current liabilities 107,306 99,784    
Equity 557,130 507,901    
Revenue 1,297,034 783,277 535,206  
Operating expense (1,076,181) (654,643) (452,495)  
Finance income (cost) 28,440 9,817 (764)  
Tax expense (income) (70,092) (38,860) (22,967)  
NET INCOME 179,201 99,591 58,980  
Other comprehensive income 1,433 294 (343)  
Comprehensive income 180,634 99,885 58,637  
Cash flows from (used in) operating activities 280,480 178,800 101,708  
Cash flows from (used in) investing activities (427,175) (14,273) (17,120)  
Cash flows from (used in) financing activities (2,887) (64,545) (115,625)  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes (149,582) 99,982 (31,037)  
Cash and cash equivalents at the beginning of the year 210,641 110,659 141,696  
Cash and cash equivalents at the end of the year 61,059 210,641 110,659  
Elejor [Member]        
IfrsStatementLineItems [Line Items]        
Assets 848,198 813,670    
Current assets 224,833 166,890    
Non-current assets 623,365 646,780    
Liabilities 848,198 813,670    
Current liabilities 111,142 107,772    
Non-current liabilities 771,897 746,843    
Equity (34,841) (40,945)    
Revenue 194,287 171,263 194,849  
Operating expense (86,033) (86,871) (67,323)  
Finance income (cost) (113,102) (171,888) (172,049)  
Tax expense (income) 4,158 33,061 15,154  
NET INCOME (690) (54,435) (29,369)  
Other comprehensive income 6,795 (0) (0)  
Comprehensive income 6,105 (54,435) (29,369)  
Cash flows from (used in) operating activities 45,249 127,510 22,097  
Cash flows from (used in) investing activities (7,364) (31,095) (208)  
Cash flows from (used in) financing activities (0) (0) (8,151)  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes 37,885 96,415 13,738  
Cash and cash equivalents at the beginning of the year 148,031 51,616 37,878  
Cash and cash equivalents at the end of the year 185,916 148,031 51,616  
U E G Araucaria [Member]        
IfrsStatementLineItems [Line Items]        
Assets 334,418 776,201    
Current assets 97,586 515,430    
Non-current assets 236,832 260,771    
Liabilities 334,418 776,201    
Current liabilities 45,115 221,853    
Non-current liabilities 16,322 13,771    
Equity 272,981 540,577    
Revenue 98,508 2,250,577 589,909  
Operating expense (365,522) (1,879,198) (647,516)  
Finance income (cost) 11,407 8,952 203  
Tax expense (income) (11,885) (42,248) (19,920)  
NET INCOME (267,492) 338,083 (77,324)  
Other comprehensive income (103) (0) (205)  
Comprehensive income (267,595) 338,083 (77,529)  
Cash flows from (used in) operating activities (94,401) 312,676 23,491  
Cash flows from (used in) investing activities (139,033) (14,579) 1,317  
Cash flows from (used in) financing activities (147) (64,331) 32,879  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes (233,581) 233,766 57,687  
Cash and cash equivalents at the beginning of the year 298,572 64,806 7,119  
Cash and cash equivalents at the end of the year R$ 64,991 R$ 298,572 R$ 64,806