Dubuque County, IA — Solar Development Risk Assessment

No Moratorium

None codified. No confirmed county-specific solar ordinance.

Dubuque County Planning & Zoning: CUP/SUP in Agricultural district.

Generally favorable — college city; bluff identity adds some friction

NE Iowa; Dubuque (Loras/Clarke/UD colleges); bluff country; active solar in agricultural areas; local CUP

Stable

Iowa Utilities Board (IUB) generating certificate required for projects ≥25 MW (Iowa Code §478). Projects <25 MW: local CUP/SUP under county/township zoning governs. No statewide preemption of local ordinances — Iowa is a strong local-control state. County boards have full authority to restrict or deny solar below 25 MW threshold. Active local opposition movement in many agricultural counties; several moratoriums and restrictive ordinances enacted 2021–2024. IUB certificate does not override local zoning for sub-25 MW projects. MISO interconnection territory statewide.

Iowa Renewable Energy Standard: minimal (105 MW aggregate mandate met since late 1990s). Net metering: IUC-regulated utilities (MidAmerican Energy, Alliant IPL) offer net metering under Iowa Code §476A; programs vary by cooperative. Property tax exemption: 5-year exemption for solar equipment added via IA Code §427B.26. MidAmerican Energy planning 800 MW new solar at ~6 IA sites by 2028 (filed IUC Feb 17 2025). Utility: MidAmerican Energy serves Des Moines metro, western/central IA; Alliant Energy/IPL serves eastern/southern IA; rural areas served by 60+ electric cooperatives.

Alliant Energy Dubuque Solar | 5 MW | Alliant Energy | Dubuque area | Operational 2017 | At the time, the largest single-site solar project in Iowa (Iowa Solar Fact Sheet 2019). Multiple smaller commercial/distributed solar projects as Dubuque is a major city.

No confirmed IUC (Iowa Utilities Commission) denials for Dubuque County. Iowa 5-year property tax exemption for solar; IUC certificate required for ≥25 MW.