Engr. Premacio started working with the Department of Energy – Energy Utilization Management Bureau (DOE-EUMB) in September 2014 as a Science Research Specialist for the Energy Efficiency and Conservation Division (EECD). He supported the Division’s activities related to the Government Energy Management Program (GEMP), the Registration of Energy Service Companies (ESCOs) and various Information and Education Campaign (IEC) activities of the DOE pertaining to energy efficiency. When Republic Act 11285 (Energy Efficiency and Conservation Act) was signed on April 2019, and with its Implementing Rules and Regulations (IRR) being issued a few months later in November 2019, Engr. Premacio joined as one of the first members of the Energy Efficiency and Conservation Performance Regulation and Enforcement Division (EPRED) that was created under the RA 11285 to lead the development and implementation of the Philippine Energy Labeling Program (PELP) and he has been working for EPRED.