Utilization of geothermal energy resources, the heat from the Earth interior, has increased
over the last decades due to climate change concerns. However, the economic potential of
geothermal resources depends on various factors, e.g. heat flow, temperature gradient, reservoir
temperature, flow rate, but also customer base, and environmental issues. In order to minimize
financial risks during exploration and production phase and to focus on most potential sites an
assessment of available geothermal sites with a subsequent ranking is required. At least 30 hot
springs are located in Southern Thailand with exit temperatures varying between 40 and 80 °C.
From all, seven were selected in a first stage using a 60 °C surface discharge temperature and 100
°C reservoir temperature of silica geothermometer cutoff value. In a second stage a quantitative
assessment applying positive attitude factor technique was applied using numerical scores. Twenty
factors in four fractions, land use, exploration, reservoir, and marketing availability, were given
normalized scores from 1 to 3 based on available information and data presented. The final
ranking shows that two hot springs sites, one in Ranong and one in PhangNga Province, have a
good potential for further development, where advanced research budgets and investments for
geothermal exploration with a focus on renewable electricity productions should be directed.