Provided is an electricity supply-demand control device (1) comprising: a power source procurement risk computation part (14) that uses power source output for each of power sources for procurement with the risk of procurement from an electricity market and a control achievement rate (33c) indicating the degree to which control was achieved as per a command when carried out previously, thereby computing power source procurement risk data (34) for each power source for procurement, said risk data representing the likelihood that the power sources for procurement will be unable to provide required power source output; and a supply-demand control plan revision part (15) that adds power sources for procurement to supply-demand control plan data (32) until the power source procurement risk data (34) reaches a prescribed reference.
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