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Financial risk management, objectives and policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Risk Management Objectives And Policies |
Schedule of sensitivity to a reasonably possible change | The impact on the Group’s profit before income tax is due to changes in the fair value of monetary assets and liabilities.
2017 |  |  | Change in US$ rate |  |  | Effect on profit before tax |
U.S. Dollar |  |  | % |  |  | S/(000) |
|  |  |  | +5 |  |  |  | (620 | )
|  |  |  | +10 |  |  |  | (1,239 | )
|  |  |  | -5 |  |  |  | 620 |
|  |  |  | -10 |  |  |  | 1,239 |
2016 |  |  |  | Change in US$ rate |  |  |  | Effect on profit before tax |
U.S. Dollar |  |  | % |  |  | S/(000) |
|  |  |  | +5 |  |  |  | (605 | )
|  |  |  | +10 |  |  |  | (1,209 | )
|  |  |  | -5 |  |  |  | 605 |
|  |  |  | -10 |  |  |  | 1,209 |
Schedule of effect of price changes in coal | The following table shows the effect of price changes in coal:
|  |  | Change in year-end price |  |  | Effect on profit before tax |
|  |  | % |  |  | S/(000) |
2017 |  |  |  |  |  |  |
|  |  |  |  | +10 |  |  | (3,148) |
|  |  |  |  | -10 |  |  | 3,148 |
2016 |  |  |  |  |  |  |  |
|  |  |  |  | +10 |  |  | (3,780) |
|  |  |  |  | -10 |  |  | 3,780 |
Schedule of financial liabilities based on contractual undiscounted payments | The table below summarizes the maturity profile of the Group’s financial liabilities based on contractual undiscounted payments:
|  | On demand |  |  | Less than 3 months |  |  | 3 to 12 months |  |  | 1 to 5 years |  |  | More than 5 years |  |  | Total |
|  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-bearing loans adjusted by hedge |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 913,300 |  |  |  | 913,300 |
Interest |  |  | — |  |  |  | 21,904 |  |  |  | 21,904 |  |  |  | 175,230 |  |  |  | 21,904 |  |  |  | 240,942 |
Hedge finance cost payable |  |  | — |  |  |  | 13,041 |  |  |  | 13,041 |  |  |  | 104,328 |  |  |  | 13,041 |  |  |  | 143,451 |
Trade and other payables |  |  | — |  |  |  | 129,595 |  |  |  | 9,711 |  |  |  | — |  |  |  | — |  |  |  | 139,306 |
Energy supply |  |  | — |  |  |  | 3,357 |  |  |  | 2,648 |  |  |  | — |  |  |  | — |  |  |  | 6,005 |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-bearing loans adjusted by hedge |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 913,300 |  |  |  | 913,300 |
Interest |  |  | — |  |  |  | 22,680 |  |  |  | 22,680 |  |  |  | 181,440 |  |  |  | 68,040 |  |  |  | 294,840 |
Hedge finance cost payable |  |  | — |  |  |  | 13,503 |  |  |  | 13,503 |  |  |  | 108,025 |  |  |  | 40,510 |  |  |  | 175,541 |
Trade and other payables |  |  | — |  |  |  | 89,864 |  |  |  | 8,941 |  |  |  | — |  |  |  | — |  |  |  | 98,805 |
Energy supply |  |  | — |  |  |  | 3,738 |  |  |  | 5,246 |  |  |  | 914 |  |  |  | — |  |  |  | 9,898 |
Schedule of financial derivative instruments | The following table shows the corresponding reconciliation to those amounts to their carrying amounts:
|  | On demand |  |  | Less than 3 months |  |  | 3 to 12 months |  |  | 1 to 5 years |  |  | More than 5 years |  |  | Total |
|  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inflows |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 139,785 |  |  |  | 139,785 |
Outflows |  |  | — |  |  |  | (2,841 | ) |  |  | (13,032 | ) |  |  | (100,102 | ) |  |  | (11,945 | ) |  |  | (127,920 | )
Net |  |  | — |  |  |  | (2,841 | ) |  |  | (13,032 | ) |  |  | (100,102 | ) |  |  | 127,840 |  |  |  | 11,865 |
Discounted at the applicable interbank rates |  |  | — |  |  |  | (2,836 | ) |  |  | (12,885 | ) |  |  | (94,939 | ) |  |  | 111,149 |  |  |  | 489 |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inflows |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 259,195 |  |  |  | 259,195 |
Outflows |  |  | — |  |  |  | (2,942 | ) |  |  | (13,556 | ) |  |  | (105,069 | ) |  |  | (36,948 | ) |  |  | (158,515 | )
Net |  |  | — |  |  |  | (2,942 | ) |  |  | (13,556 | ) |  |  | (105,069 | ) |  |  | 222,247 |  |  |  | 100,680 |
Discounted at the applicable interbank rates |  |  | — |  |  |  | (2,933 | ) |  |  | (13,341 | ) |  |  | (97,541 | ) |  |  | 183,727 |  |  |  | 69,912 |
Changes in liabilities arising from financing activities:
|  | Balance as of January 1 |  |  | Distribution of dividends |  |  | Finance cost on cross currency swaps |  |  | Cash flows |  |  | Movement of foreign currency |  |  | Amortization of costs of issuance of senior notes |  |  | Others |  |  | Balance as of December 31 |
|  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |  |  | S/(000) |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedge finance cost payable |  | 11,073 |  |  | — |  |  | 26,140 |  |  | (26,708 | ) |  | — |  |  | — |  |  | — |  |  | 10,505 |
Dividends payable |  | 5,070 |  |  | 149,837 |  |  | — |  |  | (124,993 | ) |  | — |  |  | — |  |  | (189 | ) |  | 29,725 |
Interest-bearing loans |  | 998,148 |  |  | — |  |  | — |  |  | — |  |  | (34,502 | ) |  | 1,644 |  |  | — |  |  | 965,290 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedge finance cost payable |  | 10,897 |  |  | — |  |  | 27,800 |  |  | (27,624 | ) |  | — |  |  | — |  |  | — |  |  | 11,073 |
Dividends payable |  | 4,235 |  |  | 155,236 |  |  | — |  |  | (154,401 | ) |  | — |  |  | — |  |  | — |  |  | 5,070 |
Interest-bearing loans |  | 1,012,406 |  |  | — |  |  | — |  |  | — |  |  | (15,902 | ) |  | 1,644 |  |  | — |  |  | 998,148

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