934 N.W.2d 423
Iowa2019Background
- Palo Alto Wind Energy (PAWE) proposed a 170-turbine wind project in Palo Alto County (up to 340 MW nameplate capacity) spanning ~50,000 acres across four townships.
- Bertha and Stephen Mathis petitioned the Iowa Utilities Board (IUB) for a declaratory ruling that the entire project is a single "facility" under Iowa Code § 476A.1(5) and therefore requires an IUB certificate of public convenience, use, and necessity.
- IUB applied its long‑standing rule (dating to Zond Development Corp.) that a "facility" for wind projects is the set of turbines connected to a common gathering/collector line; turbines on separate gathering lines are separate facilities. Under that rule, no gathering line exceeded the 25 MW threshold, so no certificate was required.
- The IUB reaffirmed that precedent in a 2018 declaratory order; the Mathises sought judicial review in district court, which affirmed the IUB. The Mathises appealed to the Iowa Supreme Court.
- The Supreme Court held (1) the legislature had not clearly vested interpretive authority over the term "single site" in the IUB (so review is for errors at law), and (2) the term is ambiguous but the IUB’s common‑gathering‑line interpretation is reasonable and should be upheld.
Issues
| Issue | Plaintiff's Argument (Mathis) | Defendant's Argument (IUB/PAWE/County) | Held |
|---|---|---|---|
| Whether the legislature clearly vested interpretive authority in the IUB over "single site" in § 476A.1(5) | IUB rulemaking authority and practice show the Board may define "single site." | Statutory rulemaking grants do not automatically vest interpretive authority; § 476A.12 is not dispositive. | Legislature did not clearly vest interpretive authority in the IUB; court reviews for errors at law. |
| Proper meaning of "single site" for wind projects | The entire dispersed wind project (all 170 turbines) is a single site/facility requiring IUB certificate. | "Single site" is not the whole project; IUB’s common‑gathering‑line rule is a practical standard. | "Single site" is ambiguous; the common‑gathering‑line standard is reasonable and affirmed. |
| Whether Zond precedent is entitled to weight | Zond is inconsistent with statute; should be overturned. | Zond has been consistently applied for two decades; legislative inaction and related statutes support it. | Longstanding administrative interpretation, legislative acquiescence, and related statutory usage favor retaining Zond. |
| Application of statutory purpose and related provisions | Broad reading to capture unitary jurisdiction (citing Reid) | Alternative energy is geographically diffuse; statutes (waiver, policy to encourage alt energy) support narrower rule reducing regulatory burden. | Reid is distinguishable; policies and waiver authority support IUB’s practical, narrower approach. |
Key Cases Cited
- Reid v. Iowa State Commerce Comm’n, 357 N.W.2d 588 (Iowa 1984) (unitary jurisdiction over geographically separated components of a conventional generating facility)
- NextEra Energy Res., LLC v. Iowa Utils. Bd., 815 N.W.2d 30 (Iowa 2012) (agency rulemaking power does not automatically vest broad interpretive authority)
- Hawkeye Land Co. v. Iowa Utils. Bd., 847 N.W.2d 199 (Iowa 2014) (no clear legislative vesting of interpretive authority over certain statutory terms)
- SZ Enters., LLC v. Iowa Utils. Bd., 850 N.W.2d 441 (Iowa 2014) (limits on deference to IUB interpretations for terms not uniquely within agency expertise)
- Iowa Ins. Inst. v. Core Group of Iowa Ass’n for Justice, 867 N.W.2d 58 (Iowa 2015) (longstanding administrative interpretations may be given weight in statutory construction)