A solar power generation system (11; 21) comprising: a solar power generation unit (12; 22) configured to generate power by receiving sunlight; and an abnormality determination processing device, comprising: a model construction unit configured to construct a generated power estimation model based on a correlative relationship for each day between a generated power amount generated by the solar power generation unit (12; 22) that generates power by receiving sunlight, and an energy amount of sunlight emitted to the solar power generation unit (12; 22), the generated power estimation model being used for estimating an expected generated power amount that is expected to be generated by the solar power generation unit (12; 22); an estimation unit configured to estimate the expected generated power amount based on the generated power estimation model; and an abnormality determination unit configured to determine whether or not an abnormality has occurred by comparing the expected generated power amount and a generated power amount that is actually generated by the solar power generation unit (12; 22); characterized by a solar radiation variation determination unit configured to, - for each local segment (I 1,..., I N) obtained by dividing a predetermined period of a day in which power is generated by a predetermined number, calculate a correlation coefficient (ρ xy) between the generated power (y) generated by the solar power generation unit (12; 22) and the solar radiation intensity (x) irradiated on the solar power generation unit (12; 22), and - to determine whether or not a degree of similarity is high for each of the local segments (I1,..., IN) depending on whether the correlation coefficient (ρxy) exceeds a predetermined solar radiation variation determination threshold, wherein the estimation unit estimates the expected generated power amount only in such local segments (I 1,..., I N) for which it is determined by the solar radiation variation determination unit that the degree of similarity is high. a solar power generation unit (12; 22) configured to generate power by receiving sunlight; and an abnormality determination processing device, comprising: a model construction unit configured to construct a generated power estimation model based on a correlative relationship for each day between a generated power amount generated by the solar power generation unit (12; 22) that generates power by receiving sunlight, and an energy amount of sunlight emitted to the solar power generation unit (12; 22), the generated power estimation model being used for estimating an expected generated power amount that is expected to be generated by the solar power generation unit (12; 22); an estimation unit configured to estimate the expected generated power amount based on the generated power estimation model; and an abnormality determination unit configured to determine whether or not an abnormality has occurred by comparing the expected generated power amount and a generated power amount that is actually generated by the solar power generation unit (12; 22); characterized by a model construction unit configured to construct a generated power estimation model based on a correlative relationship for each day between a generated power amount generated by the solar power generation unit (12; 22) that generates power by receiving sunlight, and an energy amount of sunlight emitted to the solar power generation unit (12; 22), the generated power estimation model being used for estimating an expected generated power amount that is expected to be generated by the solar power generation unit (12; 22); an estimation unit configured to estimate the expected generated power amount based on the generated power estimation model; and an abnormality determination unit configured to determine whether or not an abnormality has occurred by comparing the expected generated power amount and a generated power amount that is actually generated by the solar power generation unit (12; 22); a solar radiation variation determination unit configured to, - for each local segment (I 1,..., I N) obtained by dividing a predetermined period of a day in which power is generated by a predetermined number, calculate a correlation coefficient (ρ xy) between the generated power (y) generated by the solar power generation unit (12; 22) and the solar radiation intensity (x) irradiated on the solar power generation unit (12; 22), and - to determine whether or not a degree of similarity is high for each of the local segments (I1,..., IN) depending on whether the correlation coefficient (ρxy) exceeds a predetermined solar radiation variation determination threshold, wherein the estimation unit estimates the expected generated power amount only in such local segments (I 1,..., I N) for which it is determined by the solar radiation variation determination unit that the degree of similarity is high. - for each local segment (I 1,..., I N) obtained by dividing a predetermined period of a day in which power is generated by a predetermined number, calculate a correlation coefficient (ρ xy) between the generated power (y) generated by the solar power generation unit (12; 22) and the solar radiation intensity (x) irradiated on the solar power generation unit (12; 22), and - to determine whether or not a degree of similarity is high for each of the local segments (I1,..., IN) depending on whether the correlation coefficient (ρxy) exceeds a predetermined solar radiation variation determination threshold,