INVESTMENTS - Market value of investees (Details) - BRL (R$) R$ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| ISA Energia | ||
| Associates | ||
| Percentage of shares in associates | 21.63% | 21.63% |
| Fair value | R$ 4,086,824 | R$ 3,581,661 |
| ISA Energia | COMMON | ||
| Associates | ||
| Percentage of shares in associates | 9.73% | |
| ISA Energia | PREFERRED | ||
| Associates | ||
| Percentage of shares in associates | 29.28% | |
| Equatorial Maranhão Distribuidora de Energia S.A. | ||
| Associates | ||
| Percentage of shares in associates | 33.41% | |
| Fair value | R$ 1,708,332 | 1,270,047 |
| Equatorial Maranhão Distribuidora de Energia S.A. | COMMON | ||
| Associates | ||
| Percentage of shares in associates | 33.34% | |
| Equatorial Maranhão Distribuidora de Energia S.A. | PREFERRED | ||
| Associates | ||
| Percentage of shares in associates | 37.29% | |
| Empresa Metropolitana de Águas e Energia S.A. - EMAE | ||
| Associates | ||
| Fair value | R$ 627,521 | |