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Taxes (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | R$ 3,009,172 | R$ 2,284,999
Noncurrent assets, recognized in income | 71,310 | 812,721
Noncurrent assets, Other | 4,519 |
Noncurrent assets, recognized comprehensive income | 129,007 | (88,548)
Noncurrent assets, reclassification | (53,992) |
Noncurrent assets, ending | 3,160,016 | 3,009,172
Net, beginning | 126,617 | (401,569)
Net, recognized in income | 17,047 | 628,389
Noncurrent liabilities,Other net | (204,567) | (8,155)
Net, recognized comprehensive income | 131,174 | (92,048)
Net, reclassification | 624 |
Net, ending | 70,895 | 126,617
Assets presented in the Statement of Financial Position | 1,644,299 | 963,259
Assets presented in the Statement of Financial Position | 1,757,688 | 1,644,299
Liabilities presented in the Statement of Financial Position | (1,517,682) | (1,364,828)
Liabilities presented in the Statement of Financial Position | (1,686,793) | (1,517,682)
Provision For Allocation Of P I S And Cofins Credits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 629,427 |
Noncurrent assets, recognized in income | 19,985 | 629,427
Noncurrent assets, Other |  |
Noncurrent assets, recognized comprehensive income |  |
Noncurrent assets, reclassification |  |
Noncurrent assets, ending | 649,412 | 629,427
Legal proceedings provision [member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 635,048 | 502,873
Noncurrent assets, recognized in income | (41,717) | 132,175
Noncurrent assets, Other | 4,643 |
Noncurrent assets, reclassification | (5,496) |
Noncurrent assets, ending | 592,478 | 635,048
Post Employment Benefits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 363,297 | 429,121
Noncurrent assets, recognized in income | 14,774 | 22,724
Noncurrent assets, recognized comprehensive income | 129,007 | (88,548)
Noncurrent assets, reclassification | (2,466) |
Noncurrent assets, ending | 504,612 | 363,297
Fair Value Purchase And Sale Of Power [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 251,160 | 185,460
Noncurrent assets, recognized in income | 5,060 | 65,700
Noncurrent assets, ending | 256,220 | 251,160
Noncurrent liabilities, beginning | 367,798 | 290,964
Noncurrent liabilities, recognized in income | 6,775 | 76,834
Noncurrent assets, ending | 374,573 | 367,798
Impairment Of Assets [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 295,789 | 313,275
Noncurrent assets, recognized in income | (73,376) | (17,486)
Noncurrent assets, reclassification | (9,126) |
Noncurrent assets, ending | 213,287 | 295,789
Voluntary Retirement Program [member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 479 | 23,030
Noncurrent assets, recognized in income | 207,330 | (22,551)
Noncurrent assets, ending | 207,809 | 479
Expected Credit Losses [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 139,737 | 151,149
Noncurrent assets, recognized in income | 1,852 | (11,412)
Noncurrent assets, reclassification | (633) |
Noncurrent assets, ending | 140,956 | 139,737
Tax Losses And Negative Tax Basis [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 195,062 | 121,802
Noncurrent assets, recognized in income | (55,382) | 73,260
Noncurrent assets, Other | (124) |
Noncurrent assets, reclassification | (36,271) |
Noncurrent assets, ending | 103,285 | 195,062
Taxes With Suspended Liability [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 82,181 | 74,665
Noncurrent assets, recognized in income | 7,672 | 7,516
Noncurrent assets, ending | 89,853 | 82,181
Lease liabilities [member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 74,783 | 55,659
Noncurrent assets, recognized in income | (121) | 19,124
Noncurrent assets, ending | 74,662 | 74,783
Research And Development And Energy Efficiency Programs [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 127,083 | 138,849
Noncurrent assets, recognized in income | (59,818) | (11,766)
Noncurrent assets, ending | 67,265 | 127,083
Amortization Concession [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 57,649 | 52,429
Noncurrent assets, recognized in income | 5,220 | 5,220
Noncurrent assets, ending | 62,869 | 57,649
Provisions For Performance And Profit Sharing [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 14,914 | 115,871
Noncurrent assets, recognized in income | 35,889 | (100,957)
Noncurrent assets, ending | 50,803 | 14,914
Concession Contracts [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 18,702 | 19,769
Noncurrent assets, recognized in income | (1,069) | (1,067)
Noncurrent assets, ending | 17,633 | 18,702
Noncurrent liabilities, beginning | 1,848,548 | 1,788,474
Noncurrent liabilities, recognized in income | 6,891 | 51,919
Noncurrent liabilities,Other | 209,086 | 8,155
Noncurrent liabilities, reclassification | (38,064) |
Noncurrent assets, ending | 2,026,461 | 1,848,548
Other [member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, beginning | 123,861 | 101,047
Noncurrent assets, recognized in income | 5,011 | 22,814
Noncurrent assets, recognized comprehensive income | (2,167) | 3,500
Noncurrent assets, ending | 128,872 | 123,861
Noncurrent liabilities, beginning | 55,346 | 30,174
Noncurrent liabilities, recognized in income | 17,125 | 21,672
Noncurrent liabilities, reclassification | (16,552) |
Noncurrent assets, ending | 53,752 | 55,346
Deemed Cost Of Property Plant And Equipment [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent liabilities, beginning | 307,687 | 326,497
Noncurrent liabilities, recognized in income | (16,769) | (18,810)
Noncurrent assets, ending | 290,918 | 307,687
Accelerated Depreciation [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent liabilities, beginning | 128,156 | 102,324
Noncurrent liabilities, recognized in income | 18,382 | 25,832
Noncurrent assets, ending | 146,538 | 128,156
Escrow Deposits Monetary Variation [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent liabilities, beginning | 72,827 | 65,119
Noncurrent liabilities, recognized in income | 12,063 | 7,708
Noncurrent assets, ending | 84,890 | 72,827
Right Of Use Asset [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent liabilities, beginning | 71,877 | 54,980
Noncurrent liabilities, recognized in income | (1,552) | 16,897
Noncurrent assets, ending | 70,325 | 71,877
Transaction Cost On Loans And Financing And Debentures [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent liabilities, beginning | 30,316 | 28,036
Noncurrent liabilities, recognized in income | 11,348 | 2,280
Noncurrent assets, ending | 41,664 | 30,316
Concession Contracts One [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Noncurrent assets, recognized comprehensive income | (2,167) | 3,500
Noncurrent liabilities, beginning | 2,882,555 | 2,686,568
Noncurrent liabilities, recognized in income | 54,263 | 184,332
Noncurrent liabilities,Other | 209,086 | 8,155
Noncurrent liabilities, reclassification | (54,616) |
Noncurrent assets, ending | R$ 3,089,121 | R$ 2,882,555

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