An energy control method and an energy control apparatus for a power consumption system. The energy control method includes: a step S100 in which the energy control apparatus receives a starting-up request signal to start a power consumption device; a step S200 of determining whether current power supply capacity of the power supply system meets a starting power requirement of the power consumption device to be started; and a step S300 of sending a starting-up signal to the power consumption device to be started and controlling the power supply system to supply power to the power consumption device to be started, if the current power supply capacity of the power supply system meets the starting power requirement of the power consumption device to be started; wherein the energy control method continues to make a determination as to whether the current power supply capacity of the power supply system meets the starting power requirement of the power consumption device to be started, if the current power supply capacity of the power supply system does not meet the starting power requirement of the power consumption device to be started. The active control over a grid is achieved by the energy control method of the energy control apparatus, so that the safety of the grid is guaranteed, and the stable and reliable operation is achieved.