If you lose power to your refrigerator, keep the door closed as much as possible to trap in the cold air. Check the color of your insulin before using it. Do not use it if the insulin has a cloudy appearance or another change in color, or if you see lumps or flakes in the solution., Never freeze insulin. Instead, plan ahead for power loss, if possible, by keeping ice packs or bottles of water in the freezer. If you lose power to the refrigerator, store the insulin with the frozen water bottles in a cooler or transfer the freezer packs or bottles of ice to your refrigerator to help keep the temperature cooler.