Ancillary power is a term used to describe the additional energy sources that support the primary power system. Some common synonyms for ancillary power include auxiliary power, backup power, secondary power, supplementary power, and standby power. These terms are used to refer to the power that is provided by a secondary or backup source to ensure the continuity of power supply. Ancillary power sources are essential to ensure the smooth and uninterrupted functioning of critical systems and equipment in case of power outages or other emergencies. The use of ancillary power sources has become increasingly important in recent years to address energy security and reliability concerns.