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Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 36,928,054 | R$ 29,857,376 | R$ 27,333,533 | R$ 24,931,859
Profit for the year | 9,579,563 | 3,523,531 | 3,121,267 |
Investments | 185,364 | 130,520 |  |
Investments contribution | 40,234 |  |  |
Dividends distributed | (20,104) |  |  |
Reclassification | (608) |  |  |
Equity in the earnings of subsidiaries | 34,596 | 32,394 | 24,551 |
Reversal | 853 |  |  |
Other investments | 6,099 | 6,099 |  |
Overall total | 215,803 | 161,863 |  |
Seasamm [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | 75,307 | 61,275 | 59,371 |
Contribution |  |  |  |
Dividends distributed | (4,677) |  |  |
Profit for the year | 18,709 | 20,389 | 14,825 |
Investments | 27,111 | 22,059 |  |
Investments contribution |  |  |  |
Dividends distributed | (1,683) |  |  |
Equity in the earnings of subsidiaries | R$ 6,735 | R$ 7,340 | R$ 5,337 |
Interest percentage | 36.00% | 36.00% | 36.00% |
Aguas De Andradinas [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 37,959 | R$ 34,088 | R$ 30,777 |
Contribution |  |  |  |
Dividends distributed | (1,068) |  |  |
Profit for the year | 4,939 | 3,311 | 1,186 |
Investments | 11,387 | 10,225 |  |
Investments contribution |  |  |  |
Dividends distributed | (320) |  |  |
Equity in the earnings of subsidiaries | R$ 1,482 | R$ 992 | R$ 356 |
Interest percentage | 30.00% | 30.00% | 30.00% |
Aguas De Castilho [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 8,782 | R$ 12,784 | R$ 10,787 |
Contribution |  |  |  |
Dividends distributed | (6,157) |  |  |
Profit for the year | 2,155 | 1,997 | 1,403 |
Investments | 2,635 | 3,835 |  |
Investments contribution |  |  |  |
Dividends distributed | (1,847) |  |  |
Equity in the earnings of subsidiaries | R$ 647 | R$ 599 | R$ 421 |
Interest percentage | 30.00% | 30.00% | 30.00% |
Attend Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 55,162 | R$ 43,263 | R$ 29,729 |
Contribution |  |  |  |
Dividends distributed | (6,987) |  |  |
Profit for the year | 18,886 | 17,749 | 8,177 |
Investments | 24,824 | 19,469 |  |
Investments contribution |  |  |  |
Dividends distributed | (3,143) |  |  |
Equity in the earnings of subsidiaries | R$ 8,498 | R$ 7,987 | R$ 3,680 |
Interest percentage | 45.00% | 45.00% | 45.00% |
Aquapolo Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 116,688 | R$ 102,442 | R$ 73,926 |
Contribution |  |  |  |
Dividends distributed | (26,758) |  |  |
Profit for the year | 41,004 | 37,516 | 30,496 |
Investments | 57,178 | 50,196 |  |
Investments contribution |  |  |  |
Dividends distributed | (13,111) |  |  |
Equity in the earnings of subsidiaries | R$ 20,093 | R$ 18,383 | R$ 14,943 |
Interest percentage | 49.00% | 49.00% | 49.00% |
Paulista Geradora De Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 27,004 | R$ 42,307 | R$ 10,486 |
Contribution |  |  |  |
Dividends distributed |  |  |  |
Profit for the year | (443) | 1,728 | (744) |
Cantareira SP Energia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | 10,613 | 10,650 | 1,000 |
Contribution |  |  |  |
Dividends distributed |  |  |  |
Profit for the year | (37) | (464) |  |
Investments | 5,194 | 5,212 |  |
Investments contribution |  |  |  |
Dividends distributed |  |  |  |
Equity in the earnings of subsidiaries | R$ (18) | R$ (227) |  |
Interest percentage | 49.00% | 49.00% | 49.00% |
Barueri Energia Renovavel [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 251,420 | R$ 63,309 | R$ 69,258 |
Contribution | 201,172 |  |  |
Dividends distributed |  |  |  |
Profit for the year | (12,477) | (1,686) |  |
Investments | 50,285 | 12,663 |  |
Investments contribution | 40,234 |  |  |
Dividends distributed |  |  |  |
Equity in the earnings of subsidiaries | R$ (2,495) | R$ (2,054) |  |
Interest percentage | 20.00% | 20.00% | 20.00% |
Infranext Solucoesem Pavimentacao [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ 4,154 | R$ 4,699 | R$ 7,050 |
Contribution |  |  |  |
Dividends distributed |  |  |  |
Profit for the year | (522) | (2,351) |  |
Investments |  |  |  |
Investments contribution |  |  |  |
Dividends distributed |  |  |  |
Reclassification | (608) |  |  |
Equity in the earnings of subsidiaries | (235) | R$ (1,058) |  |
Reversal | R$ 853 |  |  |
Interest percentage | 45.00% | 45.00% | 45.00% |
Sabesp Olimpia [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Equity | R$ (16,766) | R$ (3,066) |  |
Contribution |  |  |  |
Dividends distributed |  |  |  |
Profit for the year | (13,700) | (3,877) |  |
Paulista Geradora De Energia 1 [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Investments | 6,750 | 6,861 |  |
Investments contribution |  |  |  |
Dividends distributed |  |  |  |
Equity in the earnings of subsidiaries | R$ (111) | R$ 432 | R$ (186) |
Interest percentage | 25.00% | 25.00% | 25.00% |
FOXX URE-BA Ambiental [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Other investments | R$ 24,340 | R$ 25,244 |  |

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