1. (a) In addition to the review of the continued appropriateness of an environmental compliance plan under section 18 of this chapter, the commission shall, at the request of a public utility, conduct an ongoing review of the cost and implementation of the public utility's approved environmental compliance plan. The public utility that has filed a compliance plan under this chapter shall submit to the commission:

   1. (1) each year; or

   2. (2) at other times the commission and the public utility agree on;

      a progress report that includes any information the commission may require.

2. (b) If the commission approves the cost and implementation of the part of the environmental compliance plan under review, then, absent fraud, concealment, or gross mismanagement, the approval forecloses subsequent challenges to:

   1. (1) the recovery in rates of those costs; and

   2. (2) if the public utility is allowed by law to earn a return on the public utility's investment, the addition to fair value of the public utility's property of the fair value of a completed capital project, or part of a capital project, that:

      1. (A) is constructed and consists of:

         1. (i) new systems, equipment, or facilities; or
         2. (ii) modifications to existing systems, equipment, or facilities; and

      2. (B) is part of the environmental compliance plan implementation approved by the commission;

         up to the amount approved under section 8(2) or 13 of this chapter, whichever is applicable. The public utility may not recover costs in excess of the cost estimate approved by the commission under section 8(2) or 13 of this chapter, whichever is applicable, unless the commission finds that the additional costs were necessary and prudent.

3. (c) If the commission does not issue an order disapproving all or part of the implementation of the part of the environmental compliance plan under review within six (6) months of the commencement of the commission's review, the commission shall be considered to have approved all of the implementation of that part of the environmental compliance plan, unless the commission issues an order extending the time for such review.
4. (d) Except as provided in subsection (e), costs otherwise recoverable by a public utility under subsection (b) shall be recovered only through a general rate proceeding for the public utility and, to the extent such costs provide the public utility with a return of, or a return on, the public utility's investment in a completed capital project, or portion of a capital project, such costs shall be so recovered only if the capital project, or portion of the capital project, is found by the commission to be used and useful.
5. (e) Costs otherwise recoverable by a public utility under subsection
6. (b) that also qualify for recovery under IC 8-1-2-6.6 shall be recovered by the public utility when and as provided under IC 8-1-2-6.6 .
7. (f) This section applies instead of sections 12 and 16 of this chapter for a public utility that elects the review described in this section.

8. (g) If the commission disapproves all or part of the implementation of the part of the environmental compliance plan under review:

   1. (1) the commission may, consistent with sections 8 and 10 of this chapter, issue an order withdrawing the commission's approval of all or part of the environmental compliance plan; and

   2. (2) the public utility may voluntarily submit a modified environmental compliance plan to the commission for the commission's review and approval under this chapter.

      If the commission issues an order approving all or part of the modified environmental compliance plan, the environmental compliance plan constitutes the public utility's approved environmental compliance plan for purposes of this chapter.

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