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Poverty alleviation and environmental improvement are two important targets which most developing countries try to achieve. In order to promote the poverty alleviation by using clean energy sources, this paper develops a joint poverty alleviation project including the green energy investment company (GEIC), solar photovoltaic (PV) power plant (SPP) and wind power plant (WPP). By using a tripartite evolutionary game model, evolutionary stable strategies are evaluated. Influence estimate results of key factors show that longer annual operation time and higher on-grid electricity price will increase the participating intention of all the three participators. The government should increase the on-grid electricity price of the SPP properly, but control that of the WPP as the joint poverty alleviation project can also progress well even with relatively low on-grid electricity price of the WPP. A reasonable investment ratio of the SPP and WPP is the guarantee for the smooth development of the joint poverty alleviation project. In this study, the investment ratio of the SPP and WPP of 6:4 is relatively proper and can make the three participators all have relatively high increasing rates of participating intention simultaneously. The results will be of reference value for formulating relevant governmental policies on the poverty alleviation and clean energy development. [ABSTRACT FROM AUTHOR]