Lyon County commissioners voted 3-1 Thursday to approve a zoning change needed to build the massive Monarch Data Center near Yerington, clearing a hurdle for a data center development even as many other jurisdictions in the state look to pause or re-assess data center buildout. Copia Power proposed the 4.6 million-square-foot, 1,000-megawatt data center campus be built on roughly 505 acres in Mason Valley. Conceptual two-story building dimensions for Monarch Data Center, submitted by Copia Power. A mockup of planned boundaries for the Monarch Data Center in Lyon County. As drafted, the ordinance would apply to new construction, major expansions of existing data centers, and conversions of existing buildings.