I’m not sure if it’s different in the suburbs, but all of Atlanta uses the same actual gas provider, Atlanta Gas Light. All of the other companies like SCANA, Gas South, etc… are just front ends for AGL. AGL provides the actual utility, and the other companies like Gas South are in charge of billing and stuff.
https://www.reddit.com/r/Atlanta/comments/her0sz/best_natural_gas_provider_in_the_atlanta_area/