Solar permitting — St. Croix County, Wisconsin

Setbacks & buffers

Wisconsin sets NO statewide numeric setback for utility-scale solar. A facility of 100 MW or greater needs a certificate of public convenience and necessity from the PSC (s. 196.491(3)(a)1.); below that threshold, PSC approval is generally required only for a public utility and does not address siting. Local restrictions are constrained by s. 66.0401(1m), which bars a political subdivision from restricting a solar energy system unless the restriction protects public health or safety, does not significantly increase cost or decrease efficiency, or allows a comparable alternative — and Ecker Brothers v. Calumet County, 2009 WI App 112, holds that this requires a case-by-case approach rather than a one-size-fits-all ordinance. In practice setbacks are set per project in local operating or joint development agreements — NOTE: the distances above are a STATE-level fallback, not a figure read from this county's own ordinance. We hold siting-rule records for this county which may include a stricter local limit we have not yet extracted. Verify against the county's own ordinance before relying on these.

Spacing requirements

None codified.

Size restrictions

None codified; managed via CUP/SUP conditions

Penalties & bonding

No penalties or adjustments. Standard CUP/SUP process.

State-level permits & approvals

PSC of Wisconsin has siting authority for wind/solar ≥100 MW (Wis. Stat. §196.491). Projects <100 MW: local CUP/SUP under county/town zoning governs. Local restrictions on wind systems must meet one of 3 conditions: (1) public health/safety; (2) not significantly increase cost/decrease efficiency; (3) allows comparable alternative. Local solar restrictions face similar reasonableness standard. No statewide preemption below 100 MW threshold — strong local control. MISO interconnection territory statewide.

State incentive programs

Wisconsin RPS: 10% renewable by 2015 (met — weakest in region). Focus on Energy program: commercial/industrial rebates for solar ($150-450/kW for ≤25 kW). Property tax exemption: Wis. Stat. §70.111(18) — solar systems exempt from property tax assessment. Sales tax exemption: Wis. Stat. §77.54(57m) — solar equipment purchases exempt. Wisconsin Green Energy program: voluntary renewable program through WPS, MGE, We Energies. Alliant WPL (WI) has deployed ~1,089 MW solar by 2024; Vista Sands (1,315 MW Portage Co.) approved June 2025 — largest WI solar project. Utility: We Energies (WEC) serves SE WI/Milwaukee; WPS (WEC) serves NE WI; Alliant Energy (WPL) serves central/southern WI; MGE serves Madison metro; Xcel NSPW serves far NW WI; Dairyland Power Coop and WPPI Energy serve rural areas.

Grid & interconnection

MISO / Dairyland Power Cooperative (DPC) zone