Not later than December 31, 2029, and at least every three years thereafter, each natural gas company that provides utility service to two hundred fifty thousand or more customers shall file a rate case application under section 4909.18 of the Revised Code.
Rate case requirement
Ohio Rev. Code Ann. § 4909.182, under Public Utilities Commission - Fixation Of Rates.
Ohio Rev. Code Ann. § 4909.182