Yes, it is possible to close a refrigerator door without electricity. The act of closing the refrigerator door doesn't require electricity itself; it's a mechanical process. The fridge door typically has hinges and a gasket that help keep it closed and create a seal to maintain the internal temperature.
However, if the refrigerator was previously powered and the power outage caused the light to go off inside, it might be a bit challenging to see inside when closing the door. In such cases, you can use a flashlight or natural light to help you close the door securely.
If the power outage is expected to be prolonged, it's essential to keep the refrigerator door closed as much as possible to retain the cold air and preserve the food inside for a longer time. When the power comes back on, the refrigerator will resume its cooling function.