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Operating Costs and Expenses (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of operating costs and expenses
             
Consolidated     General and Other       
  Operational Selling administrative operational    Restated Restated
  costs expenses expenses expenses, net 12.31.2023 12.31.2022 12.31.2021
Non-manageable costs and expenses              
Electricity purchased for resale (31.1)      (7,716,190)                 -                         -                         -     (7,716,190)     (8,096,910)      (9,503,743)
Charge of the main distribution and transmission grid      (2,896,710)                 -                         -                         -     (2,896,710)     (2,487,997)      (2,473,700)
Materials and supplies for power electricity           (17,654)                 -                         -                         -          (17,654)            (9,349)                       -
     (10,630,554)                 -                         -                         -   (10,630,554)   (10,594,256)    (11,977,443)
Manageable costs and expenses              
Personnel and management (31.2)      (1,281,861)                 -            (596,471)                         -     (1,878,332)        (977,904)      (1,505,968)
Pension and healthcare plans (Note 22.3)         (177,275)                 -              (82,884)                         -        (260,159)        (260,197)         (243,019)
Materials           (82,419)                 -              (20,248)                         -        (102,667)          (90,541)           (66,188)
Third-party services (31.3)         (735,766)           (180)            (260,366)                         -        (996,312)        (754,551)         (636,616)
Credit losses, provisions and reversals  (31.4)          177,693    (109,435)                         -            (160,493)          (92,235)        (717,531)         (294,844)
Other operational costs and expenses, net (31.6)         (253,062)      (43,023)              (57,554)              (76,905)        (430,544)        (489,318)         (356,291)
       (2,352,690)    (152,638)         (1,017,523)            (237,398)     (3,760,249)     (3,290,042)      (3,102,926)
Other              
Depreciation and amortization      (1,278,464)                 -              (60,514)              (43,062)     (1,382,040)     (1,233,097)      (1,017,292)
Construction cost (31.5)      (2,319,720)                 -                         -                         -     (2,319,720)     (2,137,188)      (1,888,622)
Hydrological risk renegotiation - GSF                      -                 -                         -                         -                      -                      -        1,570,543
       (3,598,184)                 -              (60,514)              (43,062)     (3,701,760)     (3,370,285)      (1,335,371)
     (16,581,428)    (152,638)         (1,078,037)            (280,460)   (18,092,563)   (17,254,583)    (16,415,740)
Schedule of electricity purchased for resale
     
Consolidated      
  12.31.2023 12.31.2022 12.31.2021
Purchase of Energy in the Regulated Environment - CCEAR        3,658,852            3,538,507            3,872,427
Itaipu Binacional           980,302            1,460,955            1,787,691
Electric Energy Trade Chamber - CCEE           431,303               370,207            1,673,116
Bilateral contracts        1,998,640            2,609,713            2,578,241
Program for incentive to alternative energy sources - Proinfa           370,495               437,461               271,435
Micro and mini generators        1,125,857               675,804               360,371
(-) PIS/Pasep/Cofins taxes on electricity purchased for resale         (849,259)             (995,737)          (1,075,356)
      7,716,190            8,096,910            9,503,743
Schedule of personnel and management
     
    Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Personnel      
Salaries and management fees (a)            742,449            625,237            663,667
Social charges on payroll            220,148            207,364            218,043
Meal and education allowance            109,307              95,229              99,567
Voluntary retirement program (31.2.1)            610,057              (9,315)            139,232
          1,681,961            918,515         1,120,509
Management      
Salaries and management fees              17,889              15,606              15,332
Social charges on payroll                4,559                3,872                3,832
Other expenses                   261                   256                   254
               22,709              19,734              19,418
       
Provisions for performance and profit sharing      
of employees and administrators            173,662              39,655            366,041
       
             1,878,332               977,904            1,505,968
(a) In 2023, were recorded R$138,173 referring to vacation benefit indemnity approved by the Collective Bargaining Agreement on January 19, 2023.
Schedule of third party services
     
Consolidated   Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Maintenance of electrical system         430,954         311,553         266,601
Maintenance of facilities         117,981           89,741           97,056
Communication, processing and transmission of data         107,818           91,101           64,273
Consumer service / call center         100,574           83,203           66,733
Consulting and audit (a)           81,904           49,882           35,429
Meter reading and bill delivery            58,734           53,660           52,831
Other services           98,347           75,411           53,693
             996,312            754,551            636,616
(a) The balance includes the amount of R$21,059 relating to the costs of obtaining waiver, in compliance with the covenants (Notes 20.3 and 21.3).
Schedule of credit losses, provisions and reversals
     
    Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Provision for legal claims (a)      157,668      623,742      174,225
Impairment (reversal of impairment) of assets      
  Power generation concession contract (Note 9.3)        (3,193)          9,061        (2,604)
  Property, plant and equipment - generation segment (Note 16.4)    (174,500)      (34,435)        (9,161)
Expected credit losses (reversal of losses) - Trade accounts and Other receivables   109,435   124,068   127,837
Tax credits estimated losses        2,825     (4,905)       4,547
Provision (reversal) for losses on equity interests              -              -              -
         92,235      717,531      294,844
(a) Variation mainly due to the closure of the Arbitral Proceedings (Note 40.1)      
Schedule of construction costs
     
Consolidated    Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Materials          1,409,633            1,227,418            1,085,743
Third party services            689,886               694,306               618,400
Personnel            184,246               171,369               155,182
Other              35,955                 44,095                 29,297
             2,319,720            2,137,188            1,888,622
Schedule of other operating costs and expenses, net
     
Consolidated    Restated Restated
  12.31.2023 12.31.2022 12.31.2021
Financial offset for the use of water resources          152,604            142,270              85,545
Collection charge            43,022              47,923              50,371
Net losses (gains) in the decommissioning and disposal of assets            45,596              35,483                   (74)
Leasing and rent            30,528              33,316              19,933
Insurance            48,914              41,505              32,866
Taxes            23,463              59,188              41,268
Fair value of power generation concession assets                      -              26,451                       -
Aneel inspection fee            18,248              15,683              15,303
Compensation            21,699              14,703              48,679
Donations, contributions, grants, tax incentives (a)              8,808                6,521              37,867
Advertising and publicity      
Associação das Emissoras de Radiodifusão do Paraná - AERP            12,727              11,789              11,400
Publicity              9,772                9,835              10,918
Sponsorship              3,530                2,620                   897
Talento Olímpico Paranaense - TOP              5,225                4,665                4,750
Other net income, costs and expenses (b)              6,408              37,366              (3,432)
           430,544            489,318            356,291
(a)The balance includes the Company's social investments in education, culture, health, sports, among others, including incentive donations used as a tax benefit.
(b)The variation mainly refers to the increase in expense recovery in 2023 compared to 2022.