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This study aims to (i) measure Willingness to pay for reducing pollution from solid waste biogas power plant project (ii) examine factors affecting willingness to pay for reducing pollution from solid waste biogas power plant project and (iii) guideline to development biogas power plant in Chiang Mai Province. The population for study is households who dwell around biogas power plant of Bantan, Hod, Chiang Mai Province. Sampling by questionnaire totally 400 sample for study socioeconomic factors that influence to willingness to pay composed of basic factors and recognition and attitude for biogas power plant factors. The basic factors of this study is gender, age, the number of housing, education, occupation, income. The recognition and attitude factors is benefit or effect from biogas power plant by contingent valuation method (CVM) with hypothetical market close and ended question was used to assess the amount which households are willingness to pay. Data use to analyze environment pollution information from biogas power plant project by Interval Regression Model. The mostly of factors have relationship to willingness to pay is income per household. If have hight income per household trends willingness to pay is more than low income per household. Next factors is family size. If have hight number of housing, trends willingness to pay is increase and factors occupation. If have constancy of occupation, trends willingness to pay is increase, The result form sampling population to valuation of willingness to pay for reducing pollution from solid waste biogas power plant was average 70.12 bath.
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