PROBLEM TO BE SOLVED: To provide a renewable energy combined utilization system capable of intensifying the production energy density and increasing the efficiency in power generation of a photovoltaic power generation apparatus by utilizing the ground in which the photovoltaic power generation apparatus is set in multiple stages.SOLUTION: The renewable energy combined utilization system includes: the photovoltaic power generation apparatus set on the ground; a biomass cultivation device set under the ground of the photovoltaic power generation apparatus; and a methane fermentation tank for methane-fermenting the biomass cultivated in the biomass cultivation device. In the system, hot drain water used for cooling a light receiving surface of the photovoltaic power generation apparatus is used as a heating source for the methane fermentation tank. Organic wastes including the biomass cultivated in the biomass cultivation device are methane-fermented in the methane fermentation tank, and hot drain water used as the heating source for the methane fermentation tank is fed to the biomass cultivation device.
展开▼
