Power margin reactivity refers to the ability of a system to respond to changes in input power. Synonyms for this term include power reserve capacity, capacity factor, and load factor. Power reserve capacity refers to the amount of available power capacity that a system has, which can be used to meet increased demand or respond to changes in power supply. Capacity factor refers to the ratio of actual power output to the maximum possible output that a system can generate over a given period. Load factor refers to the average power output of a system relative to its maximum power capacity over a given period. These synonyms are often used interchangeably with power margin reactivity in discussions related to power systems and energy management.