NOVELTY - Electric power generation amount prediction involves determining structure of photovoltaic cell which performs an electric-power-generation amount estimation based on information regarding structure of designated photovoltaic cell. Environment information is determined for installation place of the photovoltaic cell. The environmental condition of the photovoltaic cell is calculated that contains a solar radiation spectrum and cell temperature based on environment information of the installation place of the photovoltaic cell.    USE - Method for predicting electric power generation amount.    ADVANTAGE - The method predicts electric power generation amount with high precision.    DETAILED DESCRIPTION - Electric power generation amount prediction involves determining structure of photovoltaic cell which performs an electric-power-generation amount estimation based on information regarding structure of designated photovoltaic cell. Environment information is determined for installation place of the photovoltaic cell. The environmental condition of the photovoltaic cell is calculated that contains a solar radiation spectrum and cell temperature based on environment information of the installation place of the photovoltaic cell. A parameter is set for the photovoltaic cell circuit for creating equivalent circuit of the photovoltaic cell. The current-voltage characteristic is calculated which contains electric power generation amount of the photovoltaic cell based on the equivalent circuit of the photovoltaic cell. INDEPENDENT CLAIMS are included for the following:    (1) an apparatus for predicting electric power generation amount; and    (2) a solar energy power generation system, which includes a voltage transformation unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the electric power generation amount prediction apparatus. (Drawing includes non-English language text).    Electric power generation amount prediction apparatus (100)    Input device (101)    Display apparatus (102)    Central processing unit (103)    Storage device (104)