Genset or generator set is one of the sources of electricity used in oil palm plantations; genset are placed in a special building that is a Genset’s house. Some of the problems encountered in the Genset’s house are oil spills, fuel oil spills, and dirty floors; scattered items in Genset’s house, packaging of hazardous and untreated substances, no safety sign board, and no work instruction. The study has conducted in an oil palm plantation company located in Central Kalimantan Province. The used method in this study is 5S (Seiri, Seiso, Seiton, Sheiketsu, and Shitsuke) by observing, interviewing, and literature review related to the discussed aspects. The results of the study show that the implementation of 5S makes the Genset’s house cleaner, the more orderly place of the goods, the no oil spill, the wider genset room, and the fundamental advantage is to reduce the environmental pollution due to the hazardous and toxic substances. So that the applied 5S principle to other parts of the company has proved to be effective in the maintenance of Genset’s houses and has reduced the possibility of fires and accidents.