Associated Press: Michigan regulators denied an air quality permit Friday for a proposed 600-megawatt coal-burning power plant in Rogers City, saying the project would damage the environment and hit customers with big rate increases. The ruling by the Department of Natural Resources and Environment dooms the plant unless Wolverine Power Supply Cooperative mounts a successful court challenge. A telephone message left Friday with the co-op, a wholesaler that provides electricity to more than 220,000 …