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Operating Costs and Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Summary of Operating Costs and Expenses |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Personnel (a) |  |  | 1,627 |  |  |  | 1,643 |  |  |  | 1,435 |
Employees’ and managers’ profit sharing |  |  | 5 |  |  |  | 7 |  |  |  | 137 |
Post-retirement benefits – Note 23 |  |  | (229 | ) |  |  | 345 |  |  |  | 156 |
Materials |  |  | 61 |  |  |  | 58 |  |  |  | 154 |
Raw materials and inputs for production of energy |  |  | 10 |  |  |  | — |  |  |  | — |
Outsourced services (b) |  |  | 974 |  |  |  | 867 |  |  |  | 899 |
Energy bought for resale (c) |  |  | 10,919 |  |  |  | 8,273 |  |  |  | 9,542 |
Depreciation and amortization |  |  | 850 |  |  |  | 834 |  |  |  | 835 |
Operating provisions (d) |  |  | 854 |  |  |  | 704 |  |  |  | 1,401 |
Charges for use of the national grid |  |  | 1,174 |  |  |  | 947 |  |  |  | 999 |
Gas bought for resale |  |  | 1,071 |  |  |  | 878 |  |  |  | 1,051 |
Construction costs (e) |  |  | 1,119 |  |  |  | 1,193 |  |  |  | 1,252 |
Other operating expenses, net (f) |  |  | 383 |  |  |  | 155 |  |  |  | 426 |
|  |  | 18,818 |  |  |  | 15,904 |  |  |  | 18,287 |
Summary of Outsourced Services |
b) | Outsourced services
|  | 2017 |  |  | 2016 |  |  | 2015 |
Meter reading and bill delivery |  |  | 142 |  |  |  | 140 |  |  |  | 122 |
Communication |  |  | 66 |  |  |  | 55 |  |  |  | 64 |
Maintenance and conservation of electrical facilities and equipment |  |  | 266 |  |  |  | 246 |  |  |  | 238 |
Building conservation and cleaning |  |  | 108 |  |  |  | 97 |  |  |  | 100 |
Contracted labor |  |  | 15 |  |  |  | 13 |  |  |  | 6 |
Freight and airfares |  |  | 8 |  |  |  | 7 |  |  |  | 10 |
Accommodation and meals |  |  | 13 |  |  |  | 13 |  |  |  | 17 |
Security services |  |  | 23 |  |  |  | 25 |  |  |  | 28 |
Consultancy |  |  | 16 |  |  |  | 15 |  |  |  | 17 |
Maintenance and conservation of furniture and utensils |  |  | 4 |  |  |  | 4 |  |  |  | 4 |
Information technology |  |  | 62 |  |  |  | 49 |  |  |  | 42 |
Maintenance and conservation of vehicles |  |  | 2 |  |  |  | 8 |  |  |  | 11 |
Disconnection and reconnection |  |  | 35 |  |  |  | 7 |  |  |  | 26 |
Environment |  |  | 11 |  |  |  | 19 |  |  |  | 22 |
Legal services |  |  | 22 |  |  |  | 26 |  |  |  | 21 |
Legal procedural costs |  |  | 3 |  |  |  | 4 |  |  |  | 3 |
Tree pruning |  |  | 21 |  |  |  | 14 |  |  |  | 23 |
Cleaning of power line pathways |  |  | 16 |  |  |  | 8 |  |  |  | 30 |
Copying and legal publications |  |  | 23 |  |  |  | 16 |  |  |  | 14 |
Inspection of customer units |  |  | 1 |  |  |  | 1 |  |  |  | 4 |
Printing of tax invoices and energy bills |  |  | 3 |  |  |  | 3 |  |  |  | 4 |
Other expenses |  |  | 114 |  |  |  | 97 |  |  |  | 93 |
|  |  | 974 |  |  |  | 867 |  |  |  | 899 |
Summary of Electricity Purchased for Resale |
c) | Energy purchased for resale
|  | 2017 |  |  | 2016 |  |  | 2015 |
Supply from Itaipu Binacional |  |  | 1,243 |  |  |  | 1,144 |  |  |  | 1,734 |
Physical guarantee quota contracts |  |  | 461 |  |  |  | 537 |  |  |  | 252 |
Quotas for Angra I and II nuclear plants |  |  | 244 |  |  |  | 217 |  |  |  | 200 |
Spot market |  |  | 1,498 |  |  |  | 761 |  |  |  | 935 |
Proinfa Program |  |  | 303 |  |  |  | 323 |  |  |  | 253 |
‘Bilateral’ contracts |  |  | 385 |  |  |  | 292 |  |  |  | 326 |
Energy acquired in Regulated Market auctions |  |  | 3,555 |  |  |  | 2,540 |  |  |  | 3,978 |
Energy acquired in the Free Market |  |  | 4,283 |  |  |  | 3,279 |  |  |  | 2,762 |
Pasep and Cofins credits |  |  | (1,053 | ) |  |  | (820 | ) |  |  | (898 | )
|  |  | 10,919 |  |  |  | 8,273 |  |  |  | 9,542 |
Summary of Operating Provisions (Reversals) |
d) | Operating provisions (reversals)
|  | 2017 |  |  | 2016 |  |  | 2015 |
Estimated losses on doubtful receivables |  |  | 248 |  |  |  | 382 |  |  |  | 175 |
Estimated losses on other accounts receivables |  |  | 27 |  |  |  | 40 |  |  |  | — |
Contingency provisions (reversals) |  |  |  |  |  |  |  |  |  |  |  |
Labor claims |  |  | 206 |  |  |  | 120 |  |  |  | 4 |
Civil |  |  | 27 |  |  |  | 30 |  |  |  | 22 |
Tax |  |  | 7 |  |  |  | 2 |  |  |  | (4 | )
Environmental |  |  | — |  |  |  | — |  |  |  | (1 | )
Regulatory |  |  | (3 | ) |  |  | — |  |  |  | 10 |
Other |  |  | (6 | ) |  |  | 31 |  |  |  | (3 | )
|  |  | 231 |  |  |  | 183 |  |  |  | 28 |
|  |  | 506 |  |  |  | 605 |  |  |  | 203 |
Adjustment for losses |  |  |  |  |  |  |  |  |  |  |  |
Put option – Parati (Note 30) |  |  | 231 |  |  |  | 55 |  |  |  | 1,079 |
Put option – SAAG (Note 30) |  |  | 116 |  |  |  | 49 |  |  |  | 119 |
Put option – Sonda (Note 30) |  |  | 1 |  |  |  | (5 | ) |  |  | — |
|  |  | 348 |  |  |  | 99 |  |  |  | 1,198 |
|  |  | 854 |  |  |  | 704 |  |  |  | 1,401 |
Summary of Construction Cost |
| e) | Construction cost
|  | 2017 |  |  | 2016 |  |  | 2015 |
Personnel and managers |  |  | 36 |  |  |  | 58 |  |  |  | 65 |
Materials |  |  | 550 |  |  |  | 534 |  |  |  | 521 |
Outsourced services |  |  | 406 |  |  |  | 448 |  |  |  | 504 |
Others |  |  | 127 |  |  |  | 153 |  |  |  | 162 |
|  |  | 1,119 |  |  |  | 1,193 |  |  |  | 1,252 |
Summary of Other Operating Expenses (Revenues), Net |
| f) | Other operating expenses (revenues), net
|  | 2017 |  |  | 2016 |  |  | 2015 |
Leasing and rentals |  |  | 103 |  |  |  | 112 |  |  |  | 102 |
Advertising |  |  | 30 |  |  |  | 13 |  |  |  | 11 |
Own consumption of energy |  |  | 24 |  |  |  | 22 |  |  |  | 21 |
Subsidies and donations |  |  | 19 |  |  |  | 17 |  |  |  | 31 |
Paid concession |  |  | 3 |  |  |  | 3 |  |  |  | 7 |
Insurance |  |  | 8 |  |  |  | 9 |  |  |  | 9 |
CCEE annual charge |  |  | 8 |  |  |  | 8 |  |  |  | 8 |
Net loss (gain) on deactivation and disposal of assets |  |  | 193 |  |  |  | 112 |  |  |  | 30 |
Forluz – Administrative running cost |  |  | 26 |  |  |  | 25 |  |  |  | 22 |
Collection agents |  |  | 71 |  |  |  | 70 |  |  |  | 71 |
Gain on disposal, Taesa |  |  | (207 | ) |  |  | (181 | ) |  |  | — |
Gain on disposal, Transchile |  |  | — |  |  |  | (134 | ) |  |  | — |
Loss on investment |  |  | 9 |  |  |  | — |  |  |  | — |
Other expenses |  |  | 96 |  |  |  | 79 |  |  |  | 114 |
|  |  | 383 |  |  |  | 155 |  |  |  | 426 |

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