Yerington, Nevada — August 28, 2026
Several significant land-use and water-right transactions and proposals in Mason Valley are raising questions about how agricultural land, water resources and rural residential areas may change as the Lyon County Board of Commissioners’ approves of new industrial & energy developments throughout Lyon County.
The proposed 505 acre Monarch Data Center and Winston Solar’s 2374 acre PUD (Planned Unit Development) project sit right in the middle of agricultural fields bordered by residential properties with some homes/properties inside those fields.
Item 12 of the Lyon County Board of Commissioners meeting on September 3 reads:
Built in to the agenda itself is the wording, “To approve a request by Winston…”
Recent decisions leading up to the changing face of Mason Valley:
Data Center Ordinance Workshop Draws Large Attendance
On August 3, 2026, the Lyon County Board of Commissioners (BOCC) conducted a Data Center Ordinance Workshop that continued for several hours. Approximately 300 people attended either in person or through the county’s Zoom link.
The workshop was scheduled as the County Commissioners considered how its ordinances will address data center development. But the Commissioners decided that the Monarch Data Center would not be held to the same standards as any data center proposed after the yet-to-be approved Data Center Ordinance.
The proposed Monarch Data Center is planned for approximately 505 acres in North Mason Valley. The property was previously zoned RR-20, a rural residential/agricultural designation generally associated with 20-acre parcels.
On August 6, the Lyon County Board of County Commissioners voted 3-1 to approve Copia Power Devco, LLC’s request to rezone approximately 505.4 acres to a Planned Unit Development (PUD) for the proposed Monarch Data Center.
The proposed sale of the 505.4 acre data center property from the Masini Trust (Masini Investments LLC, L & M Family Limited Partnership), together with approximately 1,500 acre-feet of water rights, is reportedly conditioned upon approval of the rezoning and applicable local, state and federal permits.
500 Acre-Feet of Water Sold
A separate water-right transaction also occurred during this period.
According to documents associated with the transaction, on August 4, 2026, L. Bryan Masini, Manager and Trustee, entered into a transaction involving 500 acre-feet of water rights and Southwest Critical Materials, LLC, for a reported purchase price of $10 million. The transaction was approved on August 5.
Southwest Critical Materials is involved in the development of the Pumpkin Hollow copper mining project on the East side of Yerington in Mason Valley.
The water rights were held by the Masini Trust and were associated with agricultural use. The Masini Trust is negotiating sale of their agricultural property to Copia for the Monarch Data Center as well as the Masini Trust property to the Winston Solar Project.
The transaction raises an important question for Mason Valley: What happens to agricultural land when water rights historically associated with agricultural use are transferred to another purpose or ownership?
The answer depends upon the specific water rights, their permitted place and manner of use, and how the affected properties are subsequently developed.
Proposed Solar Development Adds Another Piece to the Picture
Lyon County Community Development documents describe a proposed PUD Planned Unit Development amendment associated with the 2374 acre Winston Solar project (that places up to half of the planned 780,000 solar panels in the rural residential/agricultural landscape between Sierra Way & Penrose Lane) as an easement amendment. The Masini Trust again is named in documentation.
Solar panels blanketing the area between Sierra Way and Penrose Lane promise to change the appearance and use of the area significantly, with large-scale industrial and energy infrastructure in close proximity to existing rural residences.
Lyon County Community Development Staff Report:
ATT 1 Setback Exhibit:
ATT 2 Winston PUD Amendment:
What Happens to Agricultural Land?
The question confronting residents is not simply whether individual projects are permitted under existing law. It is also what the cumulative effect of multiple projects may be on the character their neighborhood and the land they’ve invested in.
A landscape historically characterized by agricultural fields and rural residences is now being considered for a combination of uses that includes:
- A proposed large-scale data center;
- Associated energy infrastructure;
- Water-right transactions involving hundreds of acre-feet;
- Large-scale solar development; and
- Other related energy and industrial projects.
For residents living along Penrose Lane and in the surrounding RR-20 area, these proposals represent a potentially significant change from the rural residential and agricultural setting in which they purchased their homes. Many have expressed that their rights to protect the value of their homes and their rural way of life has been infringed upon by Lyon County Commissioners’ decisions to grant the ongoing requests on behalf of the Masini Trust.
Residents Raise Concerns About Neighborhood Character
Residents opposing the Monarch Data Center rezoning have repeatedly told both the Lyon County Planning Commission and Board of County Commissioners that they do not want their rural residential neighborhood rezoned for industrial development.
The Planning Commission is appointed by the Board of County Commissioners, and both bodies play roles in the county’s land-use approval process.
Despite opposition from residents, the Board of County Commissioners approved the Monarch Data Center rezoning request on August 6 by a 3-1 vote.
The Winston Solar proposal represents a separate land-use application and an request for an easement amendment for the already-approved PUD will be considered independently by the Board on September 3, 2026.
It is therefore important to distinguish the two proceedings: the Monarch Data Center rezoning has been approved, while the Winston Solar proposal is requesting an amendment to an already-approved PUD Planned Unit Development before the Board of County Commissioners on September 3, 2026.
A Landscape in Transition
The decisions now before Lyon County Commissioners involve more than individual parcels on a map.
They involve questions about how rural residential neighborhoods, agricultural land, water rights, energy production and emerging industrial development will coexist in Mason Valley (and across Lyon County). They also involve questions about how decisions of the Lyon County’s Elected Leaders effect neighboring areas and communities.
The County Commissioners’ decisions will determine which land uses are permitted, under what conditions, and how the area develops over the coming years.
For residents of Penrose Lane and surrounding RR-20 properties, the central concern is the possibility that the rural landscape they purchased into may gradually be transformed by large-scale industrial and energy projects.
For project proponents, the applications represent proposed economic development, energy infrastructure and new uses for private property.
The September 3 Board of County Commissioners meeting will provide another opportunity for both perspectives to be heard as the county considers the Winston Solar PUD amendment.
The larger question facing Mason Valley and it’s neighboring communities may ultimately be how Lyon County Commissioners balance private property rights; whose private property rights matter more; and economic development with agricultural land, water resources and the existing character of rural residential neighborhoods.
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