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Operating costs and expenses (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
IfrsStatementLineItems [Line Items]    
Operating costs R$ (3,975,427) R$ (3,653,723)
Selling expenses (210,087) (225,657)
Bad debt expense, net of recoveries 190,518 162,805
Administrative expenses (538,138) (284,679)
Operating costs and expenses (4,914,170) (4,326,864)
Salaries Payroll Charges And Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (505,690) (583,855)
Selling expenses (62,115) (70,517)
Administrative expenses (112,499) (55,142)
Operating costs and expenses (680,304) (709,514)
Pension Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (5,810) (1,656)
Selling expenses (840) (185)
Administrative expenses (21,486) (32,822)
Operating costs and expenses (28,136) (34,663)
Construction Costs [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (1,306,723) (1,153,015)
Operating costs and expenses (1,306,723) (1,153,015)
General Supplies [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (113,440) (85,831)
Selling expenses (1,859) (1,067)
Administrative expenses 24,510 (601)
Operating costs and expenses (90,789) (87,499)
Treatment Supplies [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (141,370) (164,899)
Operating costs and expenses (141,370) (164,899)
Outside Services [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (504,745) (435,484)
Selling expenses (101,066) (109,177)
Administrative expenses (77,011) (80,267)
Operating costs and expenses (682,822) (624,928)
Electricity One [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (393,822) (395,026)
Selling expenses (210) (191)
Administrative expenses (372) (583)
Operating costs and expenses (394,404) (395,800)
General Expenses [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (283,516) (227,169)
Selling expenses (26,628) (27,626)
Administrative expenses (294,810) (60,011)
Operating costs and expenses (604,954) (314,806)
Depreciation And Amortization [Member]    
IfrsStatementLineItems [Line Items]    
Operating costs (720,311) (606,788)
Selling expenses (17,369) (16,894)
Administrative expenses (36,105) (33,463)
Operating costs and expenses (773,785) (657,145)
Bad Debt Expense Net Of Recoveries [Member]    
IfrsStatementLineItems [Line Items]    
Bad debt expense, net of recoveries (190,518) (162,805)
Operating costs and expenses (190,518) (162,805)
Tax Expense [Member]    
IfrsStatementLineItems [Line Items]    
Administrative expenses (20,365) (21,790)
Operating costs and expenses R$ (20,365) R$ (21,790)