If you don't unplug a refrigerator during a power outage, it will remain connected to the electrical supply when the power is restored. Here's what happens in that scenario:
Power restoration: When the power comes back after an outage, the refrigerator will start receiving electricity again.
Cooling cycle: The refrigerator will resume its normal operation, and the compressor will kick in to start the cooling cycle. The compressor is responsible for compressing refrigerant gas, which helps cool the refrigerator's interior.
Temperature recovery: If the power outage was relatively short, the refrigerator will work to bring the internal temperature back down to the set level. It may take some time for the refrigerator to reach its optimal cooling temperature again, depending on the duration of the power outage and the insulation of the unit.
Food safety: During a power outage, the refrigerator's temperature rises gradually as the cooling system shuts down. When the power is restored, the refrigerator will try to cool the interior again, but it may take time to reach the safe temperature range. This temporary increase in temperature during the outage can potentially affect the quality and safety of perishable food items stored inside. If the power outage lasted for an extended period (several hours or more), the food's safety may be compromised, and it's important to assess the condition of the food before consuming it.
It's generally recommended to keep the refrigerator door closed during a power outage to help maintain a cooler temperature for a longer time. Additionally, if you anticipate a prolonged power outage, it may be wise to transfer perishable items to a cooler or seek alternative temporary storage options to minimize the risk of spoilage.