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Operating costs and expenses (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Operating costs R$ (14,350,903) R$ (12,800,042) R$ (11,179,667)
Selling expenses (911,967) (825,879) (751,286)
Allowance for doubtful accounts 782,057 643,730 444,826
Administrative expenses (1,398,507) (1,124,069) (1,051,181)
Total (17,443,434) (15,393,720) (13,426,960)
Salaries Payroll Charges And Benefits [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (2,285,765) (2,026,202) (1,958,395)
Selling expenses (306,864) (265,435) (271,565)
Administrative expenses (284,562) (250,557) (257,829)
Total (2,877,191) (2,542,194) (2,487,789)
Pension Obligations [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (29,796) (36,771) (37,281)
Selling expenses (4,021) (4,868) (5,059)
Administrative expenses (84,670) (72,170) (116,941)
Total (118,487) (113,809) (159,281)
Construction Costs [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (4,754,383) (4,278,337) (3,630,139)
Total (4,754,383) (4,278,337) (3,630,139)
General Supplies [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (369,381) (314,111) (244,054)
Selling expenses (7,121) (7,976) (5,471)
Administrative expenses (23,664) (11,209) (14,237)
Total (400,166) (333,296) (263,762)
Treatment Supplies [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (598,993) (364,542) (338,756)
Total (598,993) (364,542) (338,756)
Outside Services [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (1,724,347) (1,517,196) (1,251,839)
Selling expenses (418,632) (343,763) (290,512)
Administrative expenses (250,293) (250,801) (230,054)
Total (2,393,272) (2,111,760) (1,772,405)
Electricity One [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (1,497,644) (1,462,776) (1,214,831)
Selling expenses (1,001) (1,340) (1,200)
Administrative expenses (1,896) (1,715) (1,359)
Total (1,500,541) (1,465,831) (1,217,390)
General Expenses [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (831,503) (717,352) (622,113)
Selling expenses (107,313) (136,107) (118,278)
Administrative expenses (548,626) (357,564) (257,693)
Total (1,487,442) (1,211,023) (998,084)
Depreciation And Amortization [Member]      
IfrsStatementLineItems [Line Items]      
Operating costs (2,259,091) (2,082,755) (1,882,259)
Selling expenses (67,015) (66,390) (59,201)
Administrative expenses (124,743) (104,177) (95,652)
Total (2,450,849) (2,253,322) (2,037,112)
Bad Debt Expense Net [Member]      
IfrsStatementLineItems [Line Items]      
Allowance for doubtful accounts (782,057) (643,730) (444,826)
Total (782,057) (643,730) (444,826)
Tax Expense [Member]      
IfrsStatementLineItems [Line Items]      
Administrative expenses (80,053) (75,876) (77,416)
Total R$ (80,053) R$ (75,876) R$ (77,416)