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If you don't have that much food, you can fill up old bottles or covered pitchers with water (I use a 1 liter tonic water bottle leftover from a party).
Once you fill it up, set the fridge to 40 degrees and the freezer to zero. Vacuuming the coils also helps efficiency which saves money.
It's a little thing, but along with other energy-saving habits, you may be surprised at the savings on your energy bill!
(PS: In a power outage, a full fridge will stay cold twice as long as an empty one, so you don't have to spend money replacing your food)
Photo by Noel Clark