Planning commission recommends Monarch Data Center specific plan despite traffic, safety questions; public raises concerns

The Lyon County Planning Commission on July 8 voted 6-0 to forward a recommendation to the Board of County Commissioners for a master plan amendment from Agriculture to a Specific Plan for the proposed Monarch Data Center, a project submitted by Copia Power DevCo, LLC.

The application covers two parcels totaling about 505 acres in Mason Valley and would allow up to 4,600,000 square feet of data center buildings across 14 separate structures, on-site battery energy storage systems, a potential natural‑gas backup system, electrical substations and high‑voltage generation tie (gentie) lines, according to the applicant’s materials. Copia and its consultants described a phased development approach and said the first phase could include 150 megawatts (about 2–4 data center buildings) and that full buildout depends on regional transmission upgrades such as the Nevada Greenlink project.

Copia’s representatives said the project could generate a large capital investment and recurring county revenue. Copia presented an economic estimate of roughly $11 billion in capital investment and a projected $562,000 per year in property tax revenue, of which the company said 95% would remain in Lyon County. Copia estimated 150–220 permanent operational jobs and said construction could take two to three years per phase; the company said an early phase could come online near the Greenlink timetable (the applicant cited 2028 as an approximate transmission milestone).

County staff (Senior Planner Louis Carriello) described the application as a “specific plan” request, a master‑plan‑level entitlement in Lyon County that requires additional future entitlements (a planned unit development, building permits and other reviews) before any construction may occur. Carriello said specific plans in Lyon County include detailed development content similar to planned unit developments and that, while staff received a traffic impact study that included construction‑phase estimates at staff’s request, staff did not feel it had sufficient mitigation commitments from Nevada Department of Transportation (NDOT) or final mitigation language to support a full staff recommendation to approve without additional conditions.

Traffic and public‑safety questions dominated the public hearing. The Kinley‑Horn traffic study — submitted at staff request with construction‑phase counts — estimated construction peak‑hour trips on U.S. 95A of roughly 1,100–1,300 trips during AM/PM peak hours for construction (the report’s operational‑phase trips were much lower). NDOT’s comment letter recommended mitigation including turn lanes, deceleration lanes and, potentially, a temporary signal at the Penrose Lane intersection during construction. Copia’s traffic engineer, David Jockerman (Kimley‑Horn), said the project team intends to fund permanent turn‑lane improvements and was discussing temporary signalization and other mitigations with NDOT.

Commissioners debated whether the planning commission’s recommendation would prematurely clear the way for a project without binding, written mitigation commitments. County manager Andrew Haskin and staff clarified that master plan amendments and zoning map amendments cannot be conditioned and that a planned unit development process would be the vehicle for detailed, enforceable development standards and mitigation commitments. Haskin also said a continuance would require the applicant’s concurrence and good cause; the applicant indicated it wished to proceed and that timing considerations tied to county and regional permitting schedules were a factor.

More than a dozen people provided public comment in person. Residents who live on Penrose Lane and nearby properties said they were opposed, citing heavy farm traffic on narrow rural roads, risks to well water and irrigation, visual and noise impacts, battery energy storage fire and hazardous‑materials concerns, and property‑value effects. Several public commenters urged additional mitigation for emergency access and left‑turn lanes onto other local roads.

Copia reiterated that the specific‑plan request is a first step and that detailed design, traffic mitigation and public‑safety measures would be developed during the planned‑unit‑development and permitting process. “All we’re asking for is just the opportunity to work with you through the PUD process,” said Ashwitz (Copia lead presenter), who said the company would return with site‑specific plans that the county and public could review.

The commission voted 6-0 to forward a recommendation of approval to the Board of County Commissioners; commissioners and staff noted that more detailed, enforceable conditions would be reviewed in the subsequent PUD and permit processes.