ALLENTOWN -- PPL Electric customers are being asked to conserve energy during this cold snap, according to a press release. PJM, the electricity grid operator for the region, says it needs to ensure adequate power supplies during the peak electricity use periods of 6-9 a.m. and 3-7 p.m. Among the things PPL suggests: * If you have electric heat, set your thermostats lower than usual if your health permits. * Postpone using major electric appliances like stoves, dishwashers and clothes dryers until noontime or after 9 p.m., when demand decreases. * Turn off electric lights and appliances that are not in use.