Ill. Admin. Code tit. 83, § 512.100
b) All marketing materials, including, but not limited to, electronic marketing materials, in-person solicitations, and telephone solicitations, shall include the following statement:
"(Name of the alternative gas supplier) is not the same entity as your gas delivery company. You are not required to enroll with (name of alternative gas supplier). Beginning on (effective date), the utility gas supply cost rate per therm is (cost). The utility gas supply cost will expire on (expiration date). For more information go to the Illinois Commerce Commission's free website at www.icc.illinois.gov/ags/consumereducation.aspx.". [220 ILCS 5/19-115(g)(1)]