On the premise of localization of village and town resources and clean and renewable energy, by decomposing the cost of rural energy system into economic cost and environmental cost, the quantitative evaluation model of low-cost elements of rural energy system is established. The environmental cost is based on the output of life cycle assessment inventory. With a 15-year cycle, twelve energy system schemes in three typical villages and towns in severe cold areas and cold areas in China are taken as examples for comprehensive cost comparison. From the quantitative analysis results, the energy system dominated by fossil fuels (coal and liquefied petroleum gas) has higher economic cost and higher environmental cost; the energy system based on straw and firewood has lower economic cost and higher environmental cost; the economic cost and environmental cost of the energy system based on straw gas and biogas are low, and the comprehensive cost per capita is less than 5000 yuan, which is the optimal scheme for the future rural energy system planning.
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