Can I use an extension cord for a mini fridge?
An extension cord


is usually lighter gauge than house wiring
introduces an additional connection, another opportunity for reduced voltage
the connection may be exposed to dust and/or liquids
the connection can easily be loosened exposing open, live conductors
the connection may be in a place more accessible to children, pets, falling metallic debris, vehicle tires, etc.


The lighter gauge wire may lower the life of the fridge's motor by not providing full voltage especially during motor starting.  In severe (though rare) cases, the light gauge wire could be a fire hazard if the fridge runs especially hard, like when an overabundance or lack of refrigerant oil causes the pump to work hard.

In commercial and industrial sites (at least around here), fire inspectors require immediate removal of extension cords from anything vaguely permanent looking.

If your kegerator is going to be in use for some time, why not install a real outlet in the right place for it?  In a garage or utility area, the wall doesn't (usually&mdash;depending on your wife) have to be perfectly patched.  The wire, outlet, box, nails, etc., won't set you back more than about $15.