Frankfort, KY – A Texas-based natural gas firm is requesting a rate increase in Kentucky that may raise residential customers' bills by over $4 a month. Atmos Energy Corporation filed a request with the Kentucky Public Service Commission a week ago today. The state regulator has up to 10 months to rule on the application, so it's unlikely the change will appear on this winter's heating bills when gas usage peaks. Atmos says the increases will recover fixed costs in recent and planned system improvements on the company's pipeline. The company serves some 30,000 customers in West Kentucky.