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12. Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 19,551,688 | R$ 17,513,009 | R$ 15,419,211 | R$ 13,716,606
Dividends distributed |  | 673,765 | 598,612 | 700,034 |
Profit for the year |  | 2,835,068 | 2,519,310 | 2,947,098 |
Investments |  | 44,587 | 36,932 | 31,096 |
Sesamm |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | 43,547 | 39,262 | 37,198 |
Capital increase |  | 0 |  |  |
Dividends distributed |  | (1,336) |  |  |
Profit for the year |  | 5,621 | 2,707 | 8,601 |
Profit for the year - change in the equity | [1] |  | 0 |  |
Investments |  | 15,677 | 14,135 |  |
Capital increase |  | 0 |  |  |
Dividends distributed - change in the equity | [1] |  | (481) |  |
Equity in the earnings of subsidiaries |  | R$ 2,023 | 975 | R$ 3,096 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ 0 |  |
Interest percentage |  | 36.00% | 36.00% | 36.00% |
Aguas de Andradina |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 24,832 | R$ 19,392 | R$ 16,161 |
Capital increase |  | 3,033 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | 2,425 | 4,471 | 1,772 |
Profit for the year - change in the equity | [1] |  | (18) |  |
Investments |  | 7,450 | 5,818 |  |
Capital increase |  | 910 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ 727 | 729 | R$ 532 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ (5) |  |
Interest percentage |  | 30.00% | 30.00% | 30.00% |
Aguas de Castilho |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 6,084 | R$ 4,880 | R$ 3,706 |
Capital increase |  | 203 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | 1,060 | 933 | 631 |
Profit for the year - change in the equity | [1] |  | (59) |  |
Investments |  | 1,826 | 1,465 |  |
Capital increase |  | 61 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ 318 | 287 | R$ 189 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ (18) |  |
Interest percentage |  | 30.00% | 30.00% | 30.00% |
Saneaqua Mairinque |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 5,720 | R$ 4,327 | R$ 4,090 |
Capital increase |  | 2,183 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | (478) | 390 | 723 |
Profit for the year - change in the equity | [1] |  | (312) |  |
Investments |  | 1,716 | 1,298 |  |
Capital increase |  | 655 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ (143) | 71 | R$ 217 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ (94) |  |
Interest percentage |  | 30.00% | 30.00% | 30.00% |
Attend Ambiental |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 1,426 | R$ 5,169 | R$ 3,925 |
Capital increase |  | 0 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | (4,731) | 1,324 | 841 |
Profit for the year - change in the equity | [1] |  | 988 |  |
Investments |  | 642 | 2,326 |  |
Capital increase |  | 0 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ (2,129) | 560 | R$ 378 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ 445 |  |
Interest percentage |  | 45.00% | 45.00% | 45.00% |
Aquapolo Ambiental |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 30,170 | R$ 18,757 | R$ 12,340 |
Capital increase |  | 0 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | 11,410 | 6,470 | 689 |
Profit for the year - change in the equity | [1] |  | 3 |  |
Investments |  | 14,783 | 9,191 |  |
Capital increase |  | 0 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ 5,591 | 3,144 | R$ 338 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ 1 |  |
Interest percentage |  | 49.00% | 49.00% | 49.00% |
Paulista Geradora de Energia |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity |  | R$ 7,625 | R$ 8,447 | R$ 8,469 |
Capital increase |  | 0 |  |  |
Dividends distributed |  | 0 |  |  |
Profit for the year |  | (448) | (22) | (40) |
Profit for the year - change in the equity | [1] |  | (374) |  |
Investments |  | 1,905 | 2,111 |  |
Capital increase |  | 0 |  |  |
Dividends distributed - change in the equity | [1] |  | 0 |  |
Equity in the earnings of subsidiaries |  | R$ (112) | (6) | R$ (10) |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | R$ (94) |  |
Interest percentage |  | 25.00% | 25.00% | 25.00% |
Total |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Investments |  | R$ 43,999 | R$ 36,344 |  |
Capital increase |  | 1,626 |  |  |
Dividends distributed - change in the equity | [1] |  | (481) |  |
Equity in the earnings of subsidiaries |  | 6,275 | 5,760 | R$ 4,740 |
Equity in the earnings of subsidiaries - change in the equity | [1] |  | 235 |  |
Other investments |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Investments |  | R$ 588 | R$ 588 |  |
[1] | Refer to changes in the equity of investees, as their financial statements for the year ended December 31, 2017 were issued, including some adjustments, after the the Company's financial statements.

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