An Integrated Distribution Company shall not change its price for any tariffed services allowed in Section 452.230(a) pursuant to Section 16-111(f) of the Act [220 ILCS 5/16-111(f)] , but may change prices for services in the manner provided in Article IX of the Act [220 ILCS 5 /Art. IX], and as provided in Section 16-111(a) of the Act [220 ILCS 5/16-111(a)] .
Ill. Admin. Code tit. 83, § 452.250