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INVESTMENTS - Market value of investees (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
ISA Energia |  |
Associates |  |
Percentage of shares in associates | 21.63% | 35.74%
Fair value | R$ 3,577,796 | R$ 6,465,873
ISA Energia | Common shares |  |
Associates |  |
Percentage of shares in associates | 9.73% |
ISA Energia | Preferred shares |  |
Associates |  |
Percentage of shares in associates | 29.28% |
Equatorial Maranho Distribuidora de Energia S.A. |  |
Associates |  |
Percentage of shares in associates | 33.41% |
Fair value | R$ 1,270,047 | 1,605,618
Equatorial Maranho Distribuidora de Energia S.A. | Common shares |  |
Associates |  |
Percentage of shares in associates | 33.34% |
Equatorial Maranho Distribuidora de Energia S.A. | Preferred shares |  |
Associates |  |
Percentage of shares in associates | 37.29% |
Empresa Metropolitana de guas de Energia S.A. - EMAE |  |
Associates |  |
Percentage of shares in associates | 40.44% |
Fair value | R$ 627,521 | R$ 881,518
Empresa Metropolitana de guas de Energia S.A. - EMAE | Preferred shares |  |
Associates |  |
Percentage of shares in associates | 64.82% |

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