lighting Lighting solutions for extended power outages?

I live in central Virginia and we're currently in the bullseye of a serious snowstorm; we're expecting as much as 20" between now and Sunday.  That being said, I have dozens and dozens of seeds I'm trying to start in a grow tent.  I'm thinking the easy solution would be to find a good window to set them in but I'm afraid that if the power is out the window area will not be warm enough for them.  Would I be able to leave them alone for a few days (the average amount of time our power goes out is 3 days) or will I need to do something with them in order to save them?  I've put a lot of work into them so far and it would suck to have to start over again.
 
Any kind of solution or positive words would be appreciated!
 
Edit: sorry about the double post, I can't seem to figure out how to get rid of it!
 
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