Although infrequent, power outages do happen and Mellow will stop cooking if there is no power.
Mellow will resume cooking as soon as power is restored, so there is no action you need to take in the App. However, depending on the length of the power outage, your food may not be safe to consume.
Mellow will automatically send you a notification if there is an interruption in power that may affect your food. The notification will let you know how long the power was out and may advise you to check your food if there is a chance it may not be safe to eat.
Since we don’t have a full background on the ingredients you used (number of days in your refrigerator, quality, handling, etc.) you will ultimately have to decide if the food is safe to eat or not.