If your model has a standing pilot light, it does not require house current at any time to operate; or if your appliance has our patented IPI or IPI+ System, which works on a battery back up of 2 "D" or 4 "AA" batteries (depending on the particular ignition system), it will work in event of a power outage. You will need to install batteries for operation. If you have a fan or a remote control option, they will not work without power, but the appliance itself will burn and provide heat. (If you have a remote control, you may need to operate the appliance with the ON/Off switch in the control area of the appliance).