I have noticed a dimming in our home lights when a larger item starts up, heater , vac., hair dryier etc. THis also takes place in our two neighbors homes both which come off the same transfomer? I would have to take a chance and say it sounds like maybe there is a voltage problem at the pole/ anyone have any ideas. these homes all have a heavy electric load as we are oil heat. so everything is electric, stove,water heater,ac, etc