1. (a) If the commission, after an investigation commenced upon its own initiative or upon a petition of the public utility or a class of persons satisfying the standing requirements of IC 8-1-2-54 (including the office of the utility consumer counselor), finds that substantial changes:

   1. (1) in the need for or estimated cost of an approved environmental compliance plan have occurred; or

   2. (2) in the estimated cost of alternative compliance measures have occurred;

      the commission may commence a review of the approval of the environmental compliance plan.

2. (b) If the commission finds that all or part of an environmental compliance plan no longer meets the requirements of section 8 of this chapter, the commission may, consistent with sections 8 and 10 of this chapter, issue an order:

   1. (1) withdrawing the commission's approval of all or part of the environmental compliance plan, whichever is applicable; or
   2. (2) approving modifications to the environmental compliance plan.
3. (c) If the commission approves modifications to an environmental compliance plan under subsection (b), the modified environmental compliance plan shall constitute the public utility's approved environmental compliance plan for purposes of this chapter.

As added by P.L.76-1991, SEC.1.