The hotel industry is an industry that never stops 24 hours a day, inseparable from energy needs. The energy needed is electrical energy, the portion of the use of electrical energy and the allocation of funds for its supply is the largest in this industry. Because the current electricity source is very crucial, every hotel must have a generator that will replace the electricity source if the PLN electricity source is cut off. In the use of generators, maintenance must be carried out regularly, therefore care and maintenance must be carried out in accordance with the Standard Operational for generator maintenance.The purpose of this research is to analyze the management of generator set maintenance and maintenance and to develop specific operational standards for generator set maintenance and maintenance as well as generator set maintenance cost plans. The method used is a direct survey method to the field and data collection using a questionnaire. From the results of this study it was concluded that the lack of SOPs in care and maintenance led to reduced durability and reliability of the generator set engine and after going through the analysis, the generator set engine maintenance cost for one year was Rp. 20.531.400,-