Abstract: A maximum demand power control apparatus is provided which can be easily wired up even when a large number of loads are to be controlled, and wherein the burden related to control does not fall on one device. In the construction, a sensor node 2 estimates the consumption power amount for a whole facility on the basis of the pulses outputted from an integrating wattmeter 1, and outputs power warnings information to a transmission line 5 based on the estimation. Control nodes 3a to 3c respectively control the consumption power of power loads 4a to 4c corresponding to the respective control nodes, according to power warning information received via the transmission line 5.