If only some circuits have gone off then call us to investigate. If ALL the power has gone off AND if no circuit breakers have tripped at your consumer unit / fuse board then you should call 105 to ask if there is a problem in the area and / or for them to visit to check your main fuse if they think it is necessary. If there are no known problems in the area and you have no power at all then please call us, we will need to come out to help.