v3.26.1
Investments (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Equity R$ 42,401,124 R$ 36,928,054 R$ 29,857,376 R$ 27,333,533
Capital increase      
Profit for the year 8,462,059 9,579,563 3,523,531  
Investments 208,431 185,364    
Dividends distributed (25,086)      
Equity in the earnings of subsidiaries 48,262 35,322 32,394  
Other investments 45,927 30,439    
Overall total 254,358 215,803    
Seasamm [Member]        
IfrsStatementLineItems [Line Items]        
Equity 91,455 75,307 61,275  
Capital increase      
Dividends distributed (5,382)      
Profit for the year R$ 21,530 R$ 18,709 R$ 20,389  
Equity interest percentage 36.00% 36.00% 36.00%  
Investments R$ 32,924 R$ 27,111    
Dividends distributed (1,938)      
Equity in the earnings of subsidiaries 7,751 6,735 R$ 7,340  
Aguas De Andradinas [Member]        
IfrsStatementLineItems [Line Items]        
Equity 41,291 37,959 34,088  
Capital increase      
Dividends distributed (1,173)      
Profit for the year R$ 4,505 R$ 4,939 R$ 3,311  
Equity interest percentage 30.00% 30.00% 30.00%  
Investments R$ 12,387 R$ 11,387    
Dividends distributed (352)      
Equity in the earnings of subsidiaries 1,352 1,482 R$ 992  
Aguas De Castilho [Member]        
IfrsStatementLineItems [Line Items]        
Equity 12,060 8,782 12,784  
Capital increase      
Dividends distributed (892)      
Profit for the year R$ 4,170 R$ 2,155 R$ 1,997  
Equity interest percentage 30.00% 30.00% 30.00%  
Investments R$ 3,618 R$ 2,635    
Dividends distributed (267)      
Equity in the earnings of subsidiaries 1,250 647 R$ 599  
Attend Ambiental [Member]        
IfrsStatementLineItems [Line Items]        
Equity 60,961 55,162 43,263  
Capital increase      
Dividends distributed (31,941)      
Profit for the year R$ 37,740 R$ 18,886 R$ 17,749  
Equity interest percentage 45.00% 45.00% 45.00%  
Investments R$ 27,433 R$ 24,824    
Dividends distributed (14,374)      
Equity in the earnings of subsidiaries 16,983 8,498 R$ 7,987  
Aquapolo Ambiental [Member]        
IfrsStatementLineItems [Line Items]        
Equity 143,988 116,688 102,442  
Capital increase      
Dividends distributed (16,644)      
Profit for the year R$ 43,944 R$ 41,004 R$ 37,516  
Equity interest percentage 49.00% 49.00% 49.00%  
Investments R$ 70,555 R$ 57,178    
Dividends distributed (8,155)      
Equity in the earnings of subsidiaries 21,532 20,093 R$ 18,383  
Paulista Geradora De Energia [Member]        
IfrsStatementLineItems [Line Items]        
Equity 22,769 27,004 42,307  
Capital increase      
Dividends distributed      
Profit for the year R$ (1,107) R$ (443) R$ 1,728  
Equity interest percentage 25.00% 25.00% 25.00%  
Cantareira S P Energia [Member]        
IfrsStatementLineItems [Line Items]        
Equity R$ 10,975 R$ 10,613 R$ 10,650  
Capital increase      
Dividends distributed      
Profit for the year R$ 362 R$ (37) R$ (464)  
Equity interest percentage 49.00% 49.00% 49.00%  
Investments R$ 5,378 R$ 5,194    
Dividends distributed      
Equity in the earnings of subsidiaries 178 (18) R$ (227)  
Barueri Energia Renovavel [Member]        
IfrsStatementLineItems [Line Items]        
Equity 252,212 251,420 63,309  
Capital increase      
Dividends distributed      
Profit for the year R$ (2,538) R$ (12,477) R$ (1,686)  
Equity interest percentage 20.00% 20.00% 20.00%  
Investments R$ 50,443 R$ 50,285    
Dividends distributed      
Equity in the earnings of subsidiaries (508) (2,612) R$ (2,054)  
Infranext [Member]        
IfrsStatementLineItems [Line Items]        
Equity 4,154 4,154 4,699  
Capital increase      
Dividends distributed      
Profit for the year R$ (522) R$ (2,351)  
Equity interest percentage 45.00% 45.00% 45.00%  
Equity in the earnings of subsidiaries   R$ 608 R$ (1,058)  
Paulista Geradora De Energia 1 [Member]        
IfrsStatementLineItems [Line Items]        
Investments R$ 5,693 6,750    
Dividends distributed      
Equity in the earnings of subsidiaries R$ (276) R$ (111) R$ 432