By last night, power was restored to most customers in Sunset Park, Bay Ridge, Borough Park and Park Slope who were hit by outages. All residents in those neighborhoods were asked to conserve energy by not using air-conditioners and other power-sucking appliances as "4 of the 12 big feeders...malfunctioned," due to "overheating or overloading." Con Ed worked throughout yesterday to return power to all but a few residential and commercial customers were still without power overnight. While Brooklyn residents can go back to using their AC, etc., here are tips on conserving energy (and saving money!).