Copia Power's Monarch Data Center would be a 4.6 million square foot, 1,000 megawatt campus on about 505 acres at 150 and 155 Penrose Lane in Mason Valley near Yerington, paired with a 500 megawatt natural gas backup plant and battery storage, and requiring an estimated 800 acre-feet of water a year. Lyon County commissioners approved the needed zoning change 3-1 on August 6, 2026, even as neighboring Reno, Nye County and Humboldt County have all passed data center moratoriums. Copia still needs final design approval and additional permits before construction, and Lyon County is separately developing a countywide data center ordinance.
Power bills in Lyon County
Most of the county is served by NV Energy.
2026 fuel cost filings is pending; NV Energy says it would take about $4 to $6 off a typical monthly bill. Nothing here changes a bill today. What matters is whether the large load contract survives intact; if it is weakened, the cost of plants built for data centers starts showing up in the next general rate cases around 2027 and 2028. Sierra Pacific 2024 general rate case (docket 24-02026) adds about $2.00 a month to a typical bill from October 2024.
NV Energy filed a Deferred Energy Accounting Adjustment covering 2025 fuel and purchased power costs, with a PUCN evidentiary hearing held August 24, 2026 in Las Vegas; no decision had been issued as of this report. Separately, NV Energy filed a new rate request around August 19, 2026 that would lower Southern Nevada electric rates and raise natural gas rates effective October 1, 2026 if approved, though reporting on the dollar impact is inconsistent and it is not confirmed whether this is the same proceeding tracked here.
Every Nevada rate case in dollars a month, with hearing dates: willmybillgoup.com, our rate case tracker.
Alerts for Lyon County
An email when a filing, hearing, or status changes within 25 miles of the county seat. For a tighter radius, check your own address and subscribe there.
Unsubscribe with one click. We do not sell the list.
Want this worked out for one address? The address report covers noise, water, your power bill, and what is being planned nearby. See the address report.