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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