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Financial risk management, objectives and policies (Details 2) - PEN (S/) S/ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | S/ 240,942 | S/ 294,840
Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 913,300 | 913,300
Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 143,451 | 175,541
Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 139,306 | 98,805
Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 6,005 | 9,898
Not later than one month [Member] | Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than one month [Member] | Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than one month [Member] | Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than one month [Member] | Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than one month [Member] | Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than three months [Member] | Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 21,904 | 22,680
Not later than three months [Member] | Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than three months [Member] | Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 13,041 | 13,503
Not later than three months [Member] | Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 129,595 | 89,864
Not later than three months [Member] | Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 3,357 | 3,738
Not later than one year [member] | Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 21,904 | 22,680
Not later than one year [member] | Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Not later than one year [member] | Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 13,041 | 13,503
Not later than one year [member] | Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 9,711 | 8,941
Not later than one year [member] | Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 2,648 | 5,246
Later than one year and not later than five years [Member] | Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 175,230 | 181,440
Later than one year and not later than five years [Member] | Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Later than one year and not later than five years [Member] | Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 104,328 | 108,025
Later than one year and not later than five years [Member] | Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Later than one year and not later than five years [Member] | Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  | 914
Later than five years [Member] | Interest [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 21,904 | 68,040
Later than five years [Member] | Interest-bearing loans adjusted by hedge [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 913,300 | 913,300
Later than five years [Member] | Hedge Finance Cost Payable [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities | 13,041 | 40,510
Later than five years [Member] | Trade and Other Payables [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |
Later than five years [Member] | Energy Supply [Member] |  |
Disclosure of financial liabilities [line items] |  |
Maturity of financial liabilities |  |

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