| Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash and cash equivalents | 1,948 | 2,942 | 3,223 | - | - | 5,635 | 4,162 |
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| Bonds and securities | - | 3 | 1 | 16 | 0 | 5 | 1 |
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| Collaterals and escrow accounts | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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| Trade accounts receivable | 2,944 | 3,120 | 3,768 | 4,433 | 3,342 | 3,761 | 3,963 |
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| Dividends receivable | - | 70 | 67 | 68 | 138 | 96 | 82 |
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| Sectorial financial assets | 421 | 356 | 173 | 384 | 191 | 15 | - |
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| Other current receivables | 53 | 59 | 5 | 5 | 9 | 9 | 11 |
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| Contract assets | - | 107 | 286 | 148 | 221 | 285 | 284 |
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| Fair value in the purchase and sale of power, current assets | - | - | - | - | - | - | 217 |
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| Other current receivables | 363 | 427 | 514 | 750 | 897 | 950 | 950 |
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| Inventories | 116 | 130 | 163 | 198 | 195 | 175 | 136 |
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| Current tax assets | 152 | 237 | 86 | 152 | 355 | 315 | 296 |
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| Other current recoverable taxes | 161 | 205 | 1,565 | 1,509 | 1,240 | 943 | 995 |
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| Prepaid expenses | 41 | 34 | 37 | 54 | 60 | 63 | 63 |
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| Receivable from related parties | - | - | - | - | 1 | 1 | 1 |
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| OTHER CURRENT ASSETS | - | - | - | - | - | 12,253 | 11,160 |
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| Assets held for sale | - | - | 1,231 | - | - | 1,463 | 1,882 |
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| TOTAL CURRENT ASSETS | 6,678 | 7,909 | 11,407 | 11,190 | 9,327 | 13,716 | 13,042 |
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| Bonds and securities | - | - | - | - | - | - | 529 |
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| Other temporary investments | 20 | 28 | 22 | 20 | 26 | 32 | 31 |
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| Trade accounts receivable | 163 | 62 | 51 | 82 | 110 | 105 | 116 |
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| Judicial deposits | 528 | 504 | 487 | 591 | 632 | 635 | 394 |
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| Sectorial financial assets | 258 | 118 | 173 | 384 | 191 | 15 | - |
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| Other non-current receivables | 2,498 | 2,559 | 1,898 | 2,262 | 2,270 | 2,810 | 3,497 |
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| Contract assets | - | 3,944 | 5,207 | 6,740 | 7,452 | 7,320 | 6,927 |
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| Fair value in the purchase and sale of power, non-current assets | - | - | - | - | - | - | 480 |
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| Other noncurrent receivables | 229 | 662 | 845 | 917 | 931 | 853 | 682 |
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| Current tax assets, non-current | - | 143 | 138 | 154 | 128 | 68 | 164 |
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| Deferred tax assets | 1,007 | 1,012 | 1,191 | 963 | 1,644 | 1,758 | 1,174 |
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| Other noncurrent recoverable taxes | 231 | - | - | - | - | - | 1,321 |
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| Total Long Term Assets | - | 10,863 | 16,090 | 15,743 | 16,442 | 16,343 | 15,315 |
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| Investments | - | 2,523 | 2,730 | 3,042 | 3,326 | 3,512 | 3,578 |
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| Property, plant and equipment | 10,841 | 10,592 | 9,495 | 10,143 | 10,069 | 10,825 | 8,517 |
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| Intangible assets | 6,029 | 6,333 | 6,929 | 9,216 | 10,278 | 11,170 | 16,624 |
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| Right-of-use assets | - | 93 | 133 | 204 | 261 | 253 | 309 |
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| TOTAL NONCURRENT ASSETS | 29,252 | 30,403 | 35,377 | 38,348 | 40,376 | 42,103 | 44,342 |
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| TOTAL ASSETS | 35,930 | 38,313 | 46,785 | 49,538 | 49,704 | 55,819 | 57,384 |
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| Accruals classified as current | 284 | 337 | 684 | 605 | 253 | 928 | 411 |
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| Current trade payables | 1,419 | 1,685 | 2,291 | 2,586 | 2,090 | 2,154 | 2,324 |
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| Current tax liabilities | 198 | 60 | 682 | 64 | 156 | 133 | 83 |
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| Other taxes due | 451 | 501 | 491 | 441 | 304 | 346 | 302 |
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| Loans and financing | 1,113 | 256 | 718 | 580 | 279 | 676 | 1,231 |
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| Debentures | - | 1,164 | 1,881 | 2,144 | 1,346 | 1,226 | 2,025 |
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| Dividends payable | 376 | 616 | 992 | 331 | 482 | 464 | 4 |
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| Post-employment benefits | - | 66 | 69 | 69 | 74 | 86 | 95 |
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| Accounts payable to related parties | 80 | 29 | 34 | 198 | 46 | 61 | 45 |
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| Research and development and Energy efficiency | - | 375 | 380 | 292 | 370 | 320 | 179 |
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| Trade and other current payables | 68 | 73 | 89 | 105 | 105 | 102 | 113 |
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| Sectorial financial liabilities | - | - | - | - | - | - | 935 |
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| Lease liability | - | 34 | 41 | 47 | 65 | 50 | 58 |
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| Current fair value in the purchase and sale of energy | - | - | - | - | - | - | 215 |
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| Other accounts payable | 192 | 149 | 235 | 370 | 602 | 859 | 1,199 |
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| PIS and Cofins to be refunded to consumers | - | - | 122 | 7 | 551 | 559 | - |
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| Current provision for allocation of PIS and COFINS credits | - | - | - | - | - | - | 580 |
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| OTHER CURRENT LIABILITIES | - | - | - | - | - | 8,776 | 9,801 |
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| Liabilities associated with assets held for sale | - | - | 756 | - | - | 533 | 541 |
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| TOTAL CURRENT LIABILITIES | 6,695 | 5,346 | 9,654 | 7,980 | 7,157 | 9,309 | 10,342 |
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| Accruals classified as non-current | - | - | - | - | - | - | 0 |
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| AccountsPayableToSuppliers | - | - | - | 125 | 125 | 131 | 142 |
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| Deferred tax liabilities | 157 | 294 | 484 | 1,365 | 1,518 | 1,687 | 1,895 |
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| Other taxes due | 797 | 662 | 622 | 595 | 633 | 612 | 291 |
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| Loans and financing | 2,934 | 2,887 | 2,471 | 3,099 | 4,372 | 4,667 | 3,388 |
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| Debentures | - | - | - | - | 6,458 | 8,393 | 10,602 |
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| Post-employment benefits | 910 | 1,129 | 1,424 | 1,226 | 996 | 1,398 | 1,063 |
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| Research and development and Energy efficiency | - | - | - | - | 245 | 233 | 241 |
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| Trade and other non-current payables | - | 540 | 643 | 799 | 833 | 792 | 992 |
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| Sectorial financial liabilities | 97 | 102 | - | 153 | 49 | 28 | 142 |
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| Lease liability | - | 63 | 97 | 165 | 209 | 221 | 271 |
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| Non-current fair value in the purchase and sale of energy | - | - | - | - | - | - | 171 |
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| Other accounts payable | 117 | 349 | 470 | 600 | 645 | 579 | 247 |
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| Provision for allocation of PIS and Cofins credits | - | - | - | - | - | 1,910 | 1,001 |
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| Non-current provisions | 1,665 | 1,607 | 1,556 | 1,597 | 2,038 | 336 | 957 |
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| TOTAL NONCURRENT LIABILITIES | 12,899 | 15,369 | 16,880 | 19,382 | 21,416 | 22,318 | 21,405 |
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| Share capital | 7,910 | 10,800 | 10,800 | 10,800 | 10,800 | 12,822 | 12,822 |
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| Capital reserve | - | - | - | - | - | - | 6 |
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| Revaluation surplus | 786 | 592 | 353 | 426 | 593 | 307 | 517 |
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| Treasury shares | - | - | - | - | - | - | 50 |
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| Legal reserve | 915 | 1,014 | 1,209 | 1,457 | 1,513 | 1,626 | 1,766 |
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| Profit retention reserve | - | 4,846 | 6,089 | 7,785 | 7,911 | 9,001 | 9,364 |
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| Additional dividends proposed | - | - | - | - | - | 131 | 1,250 |
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| TOTAL EQUITY | 16,033 | 17,252 | 19,959 | 21,837 | 20,817 | 23,886 | 25,675 |
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| Non-controlling interests | 303 | 346 | 291 | 338 | 314 | 306 | -38 |
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| Equity | 16,336 | 17,598 | 20,251 | 22,175 | 21,131 | 24,192 | 25,637 |
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| TOTAL LIABILITIES & EQUITY | 35,930 | 38,313 | 46,785 | 49,538 | 49,704 | 55,819 | 57,384 |
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