Commission debates solar siting, cadmium risks and review timelines in zoning chapter review

Commissioners spent a large portion of the meeting reviewing draft zoning chapters addressing lighting and energy/data systems and discussing how the county should regulate solar and related technologies.

Board members raised multiple technical and policy points: several commissioners questioned whether provisions (sections referenced in the draft as 1.09, 1.010, 1.011 and 1.14) adequately address heat generation from a range of electricity-generation sources (solar, hydro, nuclear and data centers) and whether the chapter should explicitly include those sources. One commissioner said they would submit additional information on ground heat generation, noting a study cited in the meeting that suggested thermal effects can extend for miles; staff agreed to circulate the materials.

Public commenter Brooks Swisher advised removing language that singled out ‘‘data centers’’ in noise and measurement standards and recommended that numeric measurement criteria apply to any facility type. Swisher also asked that noise and measurement language be inclusive rather than specific to data centers.

Environmental concerns surfaced about hazardous materials in some solar panels. A participant raised cadmium release as a risk if panels are destroyed by hail and proposed containment language: "...when these solar panels are destroyed by hail, it releases the cadmium... it will destroy soil for up to 300 years, according to some research that's been done," the speaker said, and suggested requiring containment to prevent soil and groundwater contamination. Other members responded that newer panels may not contain cadmium but that recycled or older panels could present a risk; the record shows the commission agreed to draft containment language as a placeholder for further review.

Commissioners also discussed farmland protections: draft language would generally prevent installations on class 1 and class 2 soils but allows conditional-use flexibility. Board members debated whether the policy should be mandatory or advisory and whether language in another section that encourages locating systems to accommodate future growth of incorporated cities creates a contradiction. The commission proposed shortening scheduled reviews from five years to three and adding an early-review clause triggered by complaints or incidents.

Members asked staff to circulate missing lighting guidance (five proposed lighting points modeled on Tucson's dark-sky approach), to refine noise-measurement language so it applies across facility types, and to draft containment language addressing cadmium. The commission will continue chapter review at future meetings and previewed discussion of event-venue zoning for the next month.