Monarch Data Center

Yerington, Lyon County, NV

Monarch Data Center is a planned data center in Yerington, NV, with Copia Power named as the developer. Reported capacity is 1,000 MW. ~505-acre, 4.6M sq ft data center campus in Mason Valley near Yerington, Lyon County, NV, developed by Copia Power. Lyon County commissioners voted 3-1 on Aug 7, 2026 to approve a zoning change (rural residential to planned unit development) — tentative approval only; final designs plus Nevada Division of Environmental Protection and State Engineer permits are still required. Project includes a 1,000MW primary data center load plus a separate 500MW natural-gas backup plant and battery storage. The Walker River Paiute and Yerington Paiute tribes have both passed resolutions opposing it; the Sierra Club flags it as possibly Nevada's first data center relying primarily on groundwater in an already over-appropriated basin.

• 1,000 MWPlanned capacity