Credits will be applied to the March bills only. That means the Gas credit will be for the amount billed for gas in March up to $25. Please note the "up to". This means the max credit you will receive will be $25. If your bill is only $5, then your credit will be $5.
There is no carryover to another month. If you have any questions, please call the utility billing department at 615-443-2839.