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Investments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2020 R$ 338,211 R$ 291,407 R$ 345,798
Net income (loss) 37,314 96,029 5,548
Other comprehensive income 2,721 144 (207)
Additional dividends proposed     (51,799)
Dividends (24,187) (49,369) (7,933)
Balance as of January 1, 2022 313,861 338,211 291,407
Distribution of dividends with retained earnings (40,198)    
Compagas [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2020 248,869 242,578 273,580
Net income (loss) 87,809 48,800 28,898
Other comprehensive income 702 144 (168)
Additional dividends proposed     (51,799)
Dividends (24,187) (42,653) (7,933)
Balance as of January 1, 2022 272,995 248,869 242,578
Distribution of dividends with retained earnings (40,198)    
Elejor [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2020 (12,285) 4,046 12,858
Net income (loss) (207) (16,331) (8,812)
Other comprehensive income 2,041
Additional dividends proposed    
Dividends
Balance as of January 1, 2022 (10,451) (12,285) 4,046
Distribution of dividends with retained earnings    
U E G Araucaria [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2020 101,627 44,783 59,360
Net income (loss) (50,288) 63,560 (14,538)
Other comprehensive income (22) (39)
Additional dividends proposed    
Dividends (6,716)
Balance as of January 1, 2022 51,317 R$ 101,627 R$ 44,783
Distribution of dividends with retained earnings