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Schedule of changes in equity attributable to non-controlling shareholders (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2019 R$ 291,407 R$ 345,798 R$ 303,289
Net income (loss) 96,029 5,548 72,923
Other comprehensive income 144 (207) (601)
Additional dividends proposed   (51,799) (3,335)
Dividends (49,369) (7,933) (31,352)
Gain with interest variation in Subsidiary     4,874
Balance as of December 31, 2021 338,211 291,407 345,798
Compagas [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2019 242,578 273,580 212,962
Net income (loss) 48,800 28,898 84,758
Other comprehensive income 144 (168) (626)
Additional dividends proposed   (51,799)
Dividends (42,653) (7,933) (23,514)
Gain with interest variation in Subsidiary    
Balance as of December 31, 2021 248,869 242,578 273,580
Elejor [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2019 4,046 12,858 16,193
Net income (loss) (16,331) (8,812) 7,838
Other comprehensive income
Additional dividends proposed   (3,335)
Dividends (7,838)
Gain with interest variation in Subsidiary    
Balance as of December 31, 2021 (12,285) 4,046 12,858
U E G Araucaria [Member]      
IfrsStatementLineItems [Line Items]      
Balance as of January 1, 2019 44,783 59,360 74,134
Net income (loss) 63,560 (14,538) (19,673)
Other comprehensive income (39) 25
Additional dividends proposed  
Dividends (6,716)
Gain with interest variation in Subsidiary     4,874
Balance as of December 31, 2021 R$ 101,627 R$ 44,783 R$ 59,360