A backup generator is a device that provides electricity during power outages. It automatically kicks in when the main power supply fails, ensuring that essential appliances and systems, like heating or refrigeration, continue to operate. Backup generators can run on various fuels, including gasoline, propane, or natural gas. These generators come in different sizes and capacities, suitable for homes, businesses, or larger facilities. Some models are portable, allowing for easy transport, while others are permanently installed outside a building. Regular maintenance is important to ensure that a backup generator functions properly when needed.