To power the fridge you need a electrical generator, crafted at a Fabricator, the Refrigerator run on Electricity, not gas, to power the Refrigerator, you must insert gas in the Electrical Generator, then hook up power cables and an outlet nearby or to the Refrigerator

Preserving bin vs refrigerator

Preserving bin can make jerky and slow item spoil rate. Refrigerator can’t make jerky but almost double the slow rate of preserving bin. Recommend having both