Abstract: A power difference compensation apparatus according to an embodiment is a power difference compensation apparatus that compensates for a difference between a power supply amount by renewable energy and a power demand amount of a load. The power difference compensation apparatus includes: a compensation pattern calculation unit configured to calculate, as a compensation pattern, a combination of a resource for compensating for a difference due to a long-term supply and demand variation in the difference and control content for the resource; and a long-term variation compensation unit configured to compensate for a difference due to the long-term supply and demand variation by controlling the resource based on the compensation pattern.

Abstract: A core quality estimation system that estimates quality of a core to be formed by filling a mold with kneaded sand produced by kneading in a kneading tank and heating the kneaded sand includes a computer that executes operations of acquiring mold temperature information of the mold, acquiring environmental information regarding a surrounding environment in which the core is formed, and estimating the quality of the core based on the mold temperature information and the environmental information.