Do gas ranges have the ability to still be lit if the power goes out?

Yes you can. If your stove has an electronic starter for the burners, MAKE SURE that you light then using a match or a long bbq grill lighter. When you turn on your burners if you hear a tick, tick, tick sound before they light then you have electric starters and you will need to light then manually. If you don't then you will needlessly put gas vapors into the room which is dangerous. If your stove has a permanently lit pilot light then you are good to go.