I have an insulated closet where Dylan the parrot has her night cage, I would move it in there on top of her night cage and put hand warmers on it, and an old quilt over it and Dylan's cage. I keep Dylan's room pretty warm, she is only a generation or 2 out of the Congo. Not freeze-hardy. I have a portable Mr. Buddy heater and propane for the long power outages. We have had a couple. One the first summer we were here was all day. It is snowing here again right now!
It look's like you are prepared for that then. You know how unreliable that electric can be in storms.