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The aim of this research is to study the social cost assessment method of air pollution from Mae Moh coal fired power plant located in Lampang province in 2010 and compare its monetary value with the contribution rate to Power Development Fund. The researcher applied the impact pathway approach (IPA) through compilation of SO2, NOx and PM10 emission from power plant and used HYSPLIT model to simulate the emissions, transport, dispersion, and deposition of pollutants. Subsequently, damages to public health were quantified by Exposure Response Function (ERF) and the monetary value of such impacts was calculated by Value of Statistical Life (VSL). The results show that (1) IPA is an appropriate way to analyze the social cost because of its complete chain of causal relationships from source of the emission through monetization of health endpoints; (2) the damage costs range between 0.000107-0.000187 satang per kWh or 179,136-311,456 THB per year. Comparing to the amount of 15,481,680 Baht paid by the power plant in 2010 for the power plant development fund in terms of health and medical support, it will be 49 times of social cost. It is found that the rate collected from the power plant to the fund is reasonable and covering the whole social cost of health impacts.

A Study of Social Cost of Power Plant: the Case of Mae Moh Power Plant