Aggregation management apparatus and aggregation management method

An aggregation management apparatus for evaluating a prediction error of a total generated energy of a set of photovoltaic power generation facilities in a target area, comprising:

• hardware storage configured to:
• store position information and performance information of each photovoltaic power generation facility in a set of photovoltaic power generation facilities and information of correspondence between a distance of two locations and a correlation level of predictive errors of solar radiation information for the two locations, each of the predictive errors of solar radiation information being a difference between an observed value of solar radiation information and a predicted value of solar radiation information and
• processing circuitry configured to:
• acquire the position information and the performance information of each photovoltaic power generation facility and the correspondence information from the storage;
• specify distances between the respective photovoltaic power generation facilities based on the position information and calculate the correlation levels between the respective photovoltaic power generation facilities, based on the distances between the respective photovoltaic power generation facilities and the correspondence information;
• and
• calculate an evaluation value for evaluating a predictive error of a total generated energy of the set of photovoltaic power generation facilities, based on the calculated correlation levels and the performance information, the predictive error of a total generated energy being a difference between a total of predicted generated energy of the set of photovoltaic power generation facilities and a total of actually supplied generated energy of the set of photovoltaic power generation facilities.