A control device optimizing evaluation of energy management in an in-plant energy network by exploiting both electric and thermal energy in such a manner as to achieve desirable overall performance. The control device, optimizing evaluation of energy management in an in-plant energy network, improves energy facility efficiency and is applicable in residential areas (e.g., general households), manufacturing industry areas (e.g., factories), and tertiary areas (e.g., office buildings, hotels, hospitals, schools, and swimming pools) for which it is desirable to reduce at least one of energy supply cost, CO2 (carbon dioxide) emission, and primary energy consumption.