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Escuela de Minas project Sector RenewablesHydroelectric Customer VOITH OXEC II hydroelectric power station Sector Electrical facilitiesHydroelectric Customer VOITH Barroso hydroelectric power station Sector Hydroelectric Customer HMV Ingenieros TRIGOMIL hydroelectric power station Sector Hydroelectric Customer IBERDROLA ingenería y construcción S.A. Rialb I hydroelectric power plant Sector Hydroelectric Customer Endesa Generación