552 S.W.3d 532
Mo.2018Background
- Ameren proposed a 2013–2015 Energy Efficiency Plan (MEEIA Plan) approved by the Missouri PSC in 2012 (with a Unanimous Stipulation) that specified certain inputs—most notably "avoided costs"—would be "deemed" (fixed) for the plan term rather than updated.
- The Commission-approved DSIM (utility incentive) ties Ameren's performance incentive to a percentage of annual net shared benefits (NSB), where NSB = avoided costs (per MWh) × net energy savings − program costs.
- Rule 20.093(1)(F) requires the utility to calculate avoided costs by "us[ing] the same methodology used in its most recently-adopted preferred resource plan (PRP)." Ameren used the PRP formula but applied the Plan’s "deemed" input values when computing 2014 Q4 NSB.
- Staff filed a complaint arguing Ameren violated Rule 20.093(1)(F) by not using both the formula and the updated 2014 PRP input values; the Commission granted Staff summary determination.
- Ameren appealed. The Missouri Supreme Court reviewed de novo whether the Plan or Rule required updating avoided-cost input values and whether the Commission reasonably interpreted "methodology." The Court vacated and remanded.
Issues
| Issue | Plaintiff's Argument (Staff) | Defendant's Argument (Ameren) | Held |
|---|---|---|---|
| Whether the approved Plan required updating avoided-cost input values for NSB calculations | The Unanimous Stipulation (esp. para. 5.b.ii re: EM&V) implicitly requires updated avoided-costs because EM&V updates energy savings | The Plan and Table 2.12 unambiguously deem avoided-cost values fixed for the plan term; only program costs, measures, and opt-outs are updated | Plan does not require updating avoided-cost inputs; Commission correctly found Plan allowed deemed values (Ameren prevails on Plan interpretation) |
| Whether Rule 20.093(1)(F) required use of both the PRP formula and the PRP’s data inputs | "Methodology" includes both the formula and the actual variable values from the most recent PRP, so Ameren violated the rule by using deemed values | "Methodology" in ordinary meaning means the method/formula only; it does not require use of the specific input values from the PRP | Court held "methodology" means the formula/method only, not the data inputs; Commission’s contrary interpretation was unreasonable |
| Whether Commission’s interpretation of Rule 20.093(1)(F) is entitled to deference | Commission’s interpretation should stand because it advances the Act’s purposes | Court should independently interpret the rule because the meaning is a legal question and not ambiguous | No deference: the Court reviewed de novo and found the rule unambiguous; no reason to adopt the Commission’s reading |
| Remedy for Commission’s erroneous interpretation | Sustain Commission order requiring Ameren to recalc using 2014 PRP values | Vacate Commission decision and remand for proceedings consistent with Court’s interpretation | Court vacated Commission’s order and remanded for further proceedings consistent with ruling |
Key Cases Cited
- Office of Pub. Counsel v. Mo. Pub. Serv. Comm'n, 409 S.W.3d 371 (Mo. banc 2013) (standard for reviewing reasonableness of PSC decisions)
- Love 1979 Partners v. Pub. Serv. Comm'n of Mo., 715 S.W.2d 482 (Mo. banc 1986) (agency interpretations of law receive no special deference)
- State v. Jones, 479 S.W.3d 100 (Mo. banc 2016) (use plain and ordinary meaning/dictionary when term undefined)
- State v. Liberty, 370 S.W.3d 537 (Mo. banc 2012) (single reasonable interpretation rule)
- Burlington N. R.R. v. Dir. of Revenue, 785 S.W.2d 272 (Mo. banc 1990) (court exercises independent judgment to correct erroneous agency interpretations)
- Textile Workers Union of Am. v. Lincoln Mills of Ala., 353 U.S. 448 (U.S. 1957) (courts cannot rewrite statutes or regulations to achieve preferred policy outcomes)