In this study, we propose an appropriate geothermal energy system. If the plant owner would like to operate this system sustainably, an awareness survey on the plant construction and/or operation among the end-users should be conducted at an early stage. A questionnaire is carried out for the purpose of understanding their consciousness. That is, we investigated the relationship between household monthly income and willingness to pay (WTP) for blackout. As result of our questionnaire, it was shown that many Indonesians do not prefer to disturb their own relaxation times. On the other hand, they understand a crisis of global warming, too. This means that they are likely to have a positive image of the idea of a geothermal plant. This is because our questionnaire revealed that almost all respondents have an eco-friendliness attitude. We obtained the following concrete suggestions: people have a willingness to pay 933.7 [IDR/kWh] to avoid a blackout for two hours, which has a correlation with their monthly household income. That is, based on our results, we would be able to associate the area in which the residents have high household income with the appropriate promotion area. Also, Indonesia’s focus is on renewable energy resources and a steady supply of electricity. It may not be suitable to use geothermal energy for electricity in the household sector. Based on our survey, we propose that geothermal energy is utilized for operating an absorption refrigerator in Kamojang to preserve the agricultural products which are produced in Garut and for Jakarta.