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14. Prepaid Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Prepaid Expenses Tables Abstract  
Prepaid Expenses
     
  12.31.2018 12.31.2017
Risk premium - GSF renegotiation (14.1)  12,574  28,033
Others  31,535  24,518
   44,109  52,551
Current  40,819  39,867
Noncurrent  3,290  12,684
Recovery of Power Purchase Cost through Renegotiation
               
Power Plant Physical guarantee
(Average MW )		 Eligible amount of energy (Average MW ) Amortization period
of prepaid expenses		 Grant extension period
(intangible asset)		 Asset value
to recover as renegotiation
of  GSF		 Value of prepaid expenses to
amortize with
future risk premium		 Value of intangible assets amortization over the concession period
Mauá 100.827 97.391 01.01.2016 to 06.30.2020 not applicable  28,623  28,623  -
Foz do Areia 576,000 226.705 01.01.2016 to 12.31.2016 05.24.2023 to 09.17.2023  66,628  17,222  49,406
Santa Clara and Fundão 135,400 134.323 01.01.2016 to 04.22.2019 10.25.2036 to 05.28.2037  39,369  30,326  9,043
    458.419      134,620  76,171  58,449
CCEE liabilities
               
  Balance as of     Balance as of     Balance as of
  January 1, 2017 Amortization Transfers December 31, 2017 Amortization Transfers December 31, 2018
Risk premium - current asset  15,459  (12,876)  12,876  15,459  (15,459)  9,394  9,394
Risk premium - noncurrent asset  25,450  -  (12,876)  12,574  -  (9,394)  3,180
Intangible  53,186  (7,441)  -  45,745  (7,038)  -  38,707
   94,095  (20,317)  -  73,778  (22,497)  -  51,281
Risk premium to be amortized - prepaid expenses  40,909      28,033      12,574
Grant extension period - intangible  53,186      45,745      38,707