Pellet fires do require a small amount of electricity to run.
Pellet fires do require a small amount of electricity to run (about the equivalent of a light bulb) so will not work during a power cut unless you have an alternative battery source.
Thankfully, power outages are not as frequent or as long anymore but in the event that this does happen, you can buy a battery pack to use which will be enough to keep it going. A 12-volt battery or a small generator is often used by our customers for backup and is easily obtained.