I think Inspire bought out Peoples Gas, because that sounds like the people I got a letter from about 4-5 months ago. I should take a look at my bill to see if I can get any better prices. Usually I just suck it up and pay.

I'm 99% sure somebody posted about Inspire in the last year, I'd do a search through this subreddit.

EDIT: Looks like it was Interstate Gas, which still sounds incredibly generic and "possibly" a scam.

Interstate Gas Supply, Inc Current Charges $90.12