CONTROLLING METHOD FOR POWER DEMAND

PURPOSE:To control power demand so that the feeding power becomes to a maximum value below a power contract, and prevent a downtime loss of a power consumptive machine like a rolling mill by calculating a demand forecasting value accurately. CONSTITUTION:A plurality of power consumptive machine units 3, 4 and 5 are classified into a first power consumptive machine unit 5 with power consumption that increases almost in proportion to the operation time, and a second power consumptive machine units 3 and 4 with power consumption that varies according to the load. A first demand forecast value R1 is sought on the basis of first actual consumptive energy P1 consumed by the first power consumptive machine unit 5, while a second demand forecast value R2 is sought on the basis of second actual consumptive energy P2 consumed by the second power consumptive machine units 3 and 4. The feeding power of machine units previously set out of power consumptive machine units 3, 4 and 5 are so controlled that the sum (=R1+R2) of first and second demand forecast values R1 and R2 becomes to a maximum below a power contract value P0.