What is defined as emergency power?

Emergency power is specifically defined as the power required to supply critical systems during emergencies, such as fire protection systems. This includes backup power sources that ensure that essential services and equipment continue to function when the normal power supply is disrupted. The integrity and functionality of fire protection systems, such as alarms, sprinklers, and emergency lighting, are vital for the safety of occupants during a fire or other emergency situations.

The other options do not accurately reflect the definition. While emergency power may be a component of what is required for general lighting, it is not limited to that context. Additionally, power generated by solar panels can be a form of renewable energy but does not inherently qualify as emergency power unless it's specifically designed for backup use. Lastly, power that is always available does not encapsulate the situational aspect of emergency power; it must be designated for emergencies, unlike routine power sources.