(a) A utility may not change its rates unless the utility files a statement of its intent with the commission at least 35 days before the effective date of the proposed change.
(b) The utility shall also mail or deliver a copy of the statement of intent to the appropriate officer of each affected municipality.

(c) The statement of intent must include:
(1) proposed revisions of tariffs; and
(2) a detailed statement of:
(A) each proposed change;
(B) the effect the proposed change is expected to have on the revenues of the utility;
(C) each class and number of utility consumers affected; and
(D) any other information required by the commission’s rules.