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1. Operations (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operations Details Narrative |  |  |
Carrying amount of intangible assets | R$ 4,345 | R$ 4,345 |
Concession agreements | 51 | 54 |
Program and service contracts | 287 | 281 |
Concession agreements that will expire | 32 |  |
Period of expiration | 2018 to 2030 |  |
Carrying amount of the underlying assets | R$ 1,577,787 |  |
Carrying amount of the underlying asset | R$ 6,205,337 |  |
Gross revenue concentrated in the municipality of São Paulo | 55.38% | 55.46% | 51.79%
Intangible assets concentrated in the municipality of São Paulo | 46.92% | 46.57% |
Gross revenue | R$ 294,658 | R$ 280,689 | R$ 269,530
Intangible assets | R$ 310,577 | R$ 303,540 |
Participation in intangible assets | 18.54% |  |
Gross revenues | 10.26% |  |

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