| 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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| Net income | - | - | - | - | - | 2,136 | 2,308 |
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| Adjustments for unrealised foreign exchange losses (gains) | 768 | 815 | 456 | 623 | 1,314 | 1,952 | 2,071 |
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| Interest - bonus from the grant of concession agreements under the quota system | -86 | 91 | 94 | 134 | 118 | 114 | 121 |
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| Remuneration of transmission concession contracts | - | 502 | 778 | 1,085 | 769 | 730 | 834 |
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| Provision for allocation of PIS and Cofins credits | - | - | - | - | -1,822 | - | - |
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| Income tax and social contribution | 580 | 434 | 1,260 | 469 | 429 | 371 | 178 |
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| Adjustments for deferred tax expense | -68 | 206 | 25 | 790 | -628 | -17 | 421 |
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| Equity in earnings of investees | -136 | 107 | 194 | 303 | 479 | 308 | 281 |
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| Other cash receipts from operating activities | - | - | - | - | - | 268 | 258 |
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| Creation for research and development and energy efficiency programs | - | 131 | 148 | 194 | 157 | 165 | 182 |
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| Recognition of fair value of assets from the indemnity for the concession | - | - | - | - | 90 | 62 | 82 |
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| Sectorial financial assets and liabilities result | - | -25 | -746 | -2,502 | -1,848 | -1,070 | -924 |
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| Depreciation and amortization | 749 | 1,094 | 1,010 | 1,083 | 1,301 | 1,382 | 1,465 |
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| Provision arising from the voluntary dismissal program | - | - | - | - | - | 610 | 18 |
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| Long-Term Incentive Plan - ILP | - | - | - | - | - | - | 6 |
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| Net operating estimated losses, provisions and reversals | 307 | 375 | 237 | 241 | 831 | 92 | 345 |
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| Realization of added value in business combinations | - | -2 | 1 | 1 | 1 | 1 | 1 |
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| Fair value in energy purchase and sale operations | - | 205 | 137 | -36 | 33 | 5 | -37 |
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| Derivatives fair value | - | - | -25 | 20 | 3 | - | - |
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| Loss on disposal of accounts receivable related to concession | 2 | 0 | 0 | 0 | 27 | 0 | 3 |
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| Loss on disposal of contract assets | 10 | -8 | -36 | -7 | -9 | -17 | -14 |
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| Loss on disposal of property, plant and equipment | 68 | -158 | -5 | -40 | -43 | -10 | -32 |
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| Loss on disposal of intangible assets | - | - | - | - | - | 79 | 76 |
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| Result of write-offs of use rights of assets and liabilities of leases - net | - | -0 | -0 | -0 | -0 | 1 | -5 |
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| Result on the sale of properties | - | - | - | - | - | - | 264 |
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| Total | 2,648 | 4,480 | 3,578 | 1,879 | 3,442 | 4,775 | 4,903 |
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| Trade accounts receivable | 191 | 226 | -175 | -211 | 1,629 | 188 | 602 |
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| Dividends and interest on own capital received | - | 37 | 54 | 83 | 68 | 175 | 224 |
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| CRC transferred to the Government of the State of Paraná | - | 279 | 300 | 1,647 | - | - | - |
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| Judicial deposits | 88 | 46 | 17 | -88 | 1 | 33 | 18 |
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| Sectorial financial assets | - | 277 | 980 | 1,510 | 966 | 37 | 354 |
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| Other receivables | 17 | -55 | -14 | -130 | 62 | -12 | -74 |
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| Inventories | -6 | -14 | -40 | -31 | 3 | 19 | 38 |
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| Income tax and social contribution recoverable | - | -61 | 124 | -267 | -499 | -201 | -296 |
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| Other taxes recoverable | - | -13 | 74 | -64 | 264 | -139 | -51 |
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| Prepaid expenses | - | 10 | -3 | -17 | -6 | -2 | -0 |
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| Related parties | - | - | - | - | -1 | -0 | 1 |
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| Total decrease (increase) in assets | 1,380 | 731 | 1,316 | 2,432 | 2,486 | 99 | 818 |
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| Payroll, social charges and accruals | - | 53 | 347 | 17 | -191 | 297 | -314 |
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| Suppliers | - | 256 | 292 | -53 | -504 | 20 | 73 |
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| Other taxes | - | -132 | -79 | 834 | 892 | 974 | 883 |
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| Post-employment benefits | -205 | -199 | -197 | -199 | -202 | -225 | -220 |
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| Sectorial charges due | - | -51 | 5 | 165 | -152 | 15 | -17 |
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| Research and development and energy efficiency | - | -91 | -154 | -247 | -204 | -255 | -337 |
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| Payable related to the concession | -64 | -71 | -75 | -88 | -106 | -116 | -110 |
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| Other accounts payable | 103 | -51 | 118 | 22 | 106 | 149 | -131 |
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| Adjustments for provisions | -144 | -368 | -167 | -208 | -242 | -373 | -345 |
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| Total increase (decrease) in liabilities | -998 | -655 | 90 | 243 | -603 | 487 | -518 |
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| CASH GENERATED BY OPERATING ACTIVITIES | 3,030 | 4,555 | 4,983 | 4,554 | 5,326 | 5,361 | 5,203 |
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| Income tax and social contribution paid | 469 | 575 | 636 | 659 | 174 | 295 | 219 |
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| Loans and financing - interest due and paid | - | - | - | 193 | 337 | 521 | 471 |
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| Debentures - interest due and paid | -501 | -700 | -386 | -344 | -890 | -1,128 | -1,089 |
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| Charges for lease liabilities paid | - | -9 | -7 | -7 | -21 | -24 | -33 |
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| NET CASH GENERATED BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS | - | - | 3,771 | 3,351 | 3,903 | 3,393 | 3,390 |
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| NET CASH GENERATED BY OPERATING ACTIVITIES FROM DISCONTINUED OPERATIONS | - | - | 170 | 36 | - | 125 | 4 |
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| NET CASH GENERATED FROM OPERATING ACTIVITIES | 1,771 | 2,945 | 3,941 | 3,387 | 3,903 | 3,518 | 3,394 |
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| Financial investments | - | - | - | - | 67 | -44 | -33 |
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| Additions to contract assets | - | 1,042 | 1,350 | 1,483 | 1,924 | 1,973 | 2,175 |
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| Acquisitions of subsidiaries - effect on cash | - | 124 | - | 502 | 18 | 911 | - |
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| Investment disposal | - | - | - | - | - | 58 | 47 |
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| Additions in investments | 52 | 134 | 72 | 31 | 5 | 11 | - |
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| Capital reduction of investees | - | - | - | - | -62 | - | -37 |
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| Additions to property, plant and equipment | - | - | - | - | - | 205 | 138 |
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| Gains (losses) on disposals of property, plant and equipment | - | - | - | - | - | - | -11 |
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| Additions to intangible assets | 8 | 5 | 10 | 5 | 422 | 13 | 4,098 |
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| NET CASH USED BY INVESTMENT ACTIVITIES FROM CONTINUING OPERATIONS | - | - | -1,594 | -2,412 | -2,775 | -3,100 | -6,348 |
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| NET CASH USED BY INVESTMENT ACTIVITIES FROM DISCONTINUED OPERATIONS | - | - | -74 | 2,444 | - | -36 | 609 |
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| Cash flows from (used in) investing activities | -2,149 | -1,664 | -1,668 | 32 | -2,775 | -3,135 | -5,739 |
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| Loans and financing obtained from third parties | - | 796 | 263 | 134 | 1,892 | 45 | 5 |
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| Transaction costs of loans and financing obtained from third parties | - | - | - | - | -20 | -7 | -2 |
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| Issue of debentures | - | - | - | -3,000 | -1,500 | -2,900 | -3,920 |
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| Transaction costs in the issuing of debentures | - | - | - | - | 14 | 61 | 61 |
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| Payments of principal - loans and financing | - | - | - | 203 | 1,000 | 261 | 262 |
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| Payments of principal - debentures | 1,492 | 1,977 | 1,036 | 1,852 | 2,051 | 1,194 | 1,080 |
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| Amortization of principal of lease liabilities | - | -31 | -46 | -51 | -60 | -69 | -71 |
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| Capital increase | - | - | - | - | - | 2,032 | - |
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| Transaction costs in capital increase | - | - | - | - | - | 15 | - |
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| Share buyback | - | - | - | - | - | - | 50 |
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| Dividends and interest on own capital paid | - | - | - | -3,874 | -2,168 | -750 | -1,587 |
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| NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS | - | - | -20 | -2 | -1,922 | 2,620 | 814 |
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| NET CASH GENERATED (USED) BY FINANCING ACTIVITIES FROM DISCONTINUED OPERATIONS | - | - | -1,695 | -2,883 | - | 77 | -10 |
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| NET CASH GENERATED (USED) FROM FINANCING ACTIVITIES | 1,287 | -288 | -1,715 | -2,884 | -1,922 | 2,697 | 804 |
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| Cash and cash equivalents at the beginning of the period | - | - | - | 2,942 | 3,223 | 3,473 | - |
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| Cash and cash equivalents at the end of the period | - | - | 3,223 | 3,473 | 2,678 | - | - |
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| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | 908 | 993 | 558 | 534 | -794 | 3,080 | -1,542 |
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