| 31.12.2015 | 31.12.2014 | |
|---|---|---|
| Amortization and depreciation | (790 375) | (728 408) |
| Costs of employee benefits | (989 489) | (948 872) |
| - salaries and wages | (723 197) | (718 901) |
| - social security and other benefits | (266 292) | (229 971) |
| Consumption of materials, raw materials, value of goods and materials sold | (1 791 115) | (1 821 196) |
| - consumption of materials and energy | (1 575 626) | (1 607 937) |
| - cost of goods and materials sold | (102 281) | (208 745) |
| - cost of gas | (113 208) | (4 514) |
| Cost of energy and gas purchased for resale | (3 282 923) | (3 835 730) |
| External services | (1 192 707) | (1 046 916) |
| - transmission services | (769 503) | (710 577) |
| - other external services | (423 204) | (336 339) |
| Taxes and charges | (290 201) | (268 934) |
| Total costs of products, goods and materials sold, selling, marketing, general and administrative expenses | (8 336 810) | (8 650 056) |
The good performance reflects the optimum use of resources in an increasingly challenging market environment.