CyrusOne has filed construction permits with the Texas Department of Licensing and Regulation for a trio of data center buildings on a new campus in Fairfield, Texas, situated adjacent to Calpine's Freestone natural gas power plant.

The USD 1.5 billion project, spanning nearly 920,000 square feet, is expected to reach completion by the end of August 2027, with two of the three buildings already under construction and the third set to break ground next month.

Campus Location and Power Arrangement

The campus sits on FM 488 highway in Freestone County, approximately 90 miles south of Dallas. CyrusOne has partnered with Calpine LLC, a wholly-owned subsidiary of Constellation Energy Corporation, on the project.

Calpine operates the adjacent Freestone Energy Campus, a one-gigawatt natural gas-fired combined-cycle facility covering approximately 506 acres, which will serve as the power source for the data center development.

The project carries a total capacity of 760 megawatts, making it one of the more substantial data center developments to be announced in the state.

The co-location of the campus directly beside the power plant reflects a model that CyrusOne and Calpine have previously employed together, reducing transmission distances and securing dedicated generation capacity for the facilities.

Building Specifications and Construction Timeline

The development comprises three structures designated DFW20A, DFW20B, and DFW20C. Each building is described in the TDLR filings as a one-story insulated pre-cast structure with accessory support spaces.

All three buildings share an identical footprint of 306,215 square feet, or approximately 28,450 square meters, bringing the total floor area across the campus to 918,650 square feet, equivalent to around 85,345 square meters.

Construction has already commenced on two of the three facilities.

The third building is scheduled to begin construction next month, according to information derived from the permit filings. Recently, CyrusOne broke ground on a 380 MW Data Center Campus in Freestone County, Texas.

The full campus is projected to be completed by the end of August 2027. As of the time of the permit filings, no tenants have been assigned to any of the three buildings.

CyrusOne's Ownership and Existing Texas Footprint

CyrusOne is owned by investment funds KKR and Global Infrastructure Partners.

The company operates more than 60 data centers across nine countries, with its portfolio spread across Europe, Asia Pacific, and North America.

Within Texas alone, CyrusOne currently operates 15 data centers, making the state a particularly significant market for the company.

The Fairfield project marks an expansion of CyrusOne's presence in Texas and adds to what is already a sizable operational base in the region.

The DFW designation given to the three new buildings places them within CyrusOne's Dallas-Fort Worth naming convention, consistent with the company's existing portfolio structure in the area.

Constellation's Acquisition of Calpine

The partnership with Calpine takes on additional context given a recent corporate development at the parent company level.

Constellation Energy, which describes itself as the largest nuclear energy company in the United States, completed its acquisition of Calpine in January 2026. Calpine itself is characterized as the largest geothermal and natural gas company in the country.

The deal means that the Freestone Energy Campus, which will supply power to CyrusOne's new facilities, now sits within the broader Constellation portfolio. Calpine continues to operate as a wholly-owned subsidiary following the transaction's close.

A Repeated Partnership Model

The Fairfield campus is not the first time CyrusOne and Calpine have worked together on a project of this type.

The two companies previously announced a 400-megawatt data center campus to be built beside the Thad Hill Energy Campus natural gas power plant, a project that was made public in July 2025.

That earlier development is expected to be operational by the fourth quarter of 2026.

The Freestone County project, at 760 megawatts, represents a considerably larger undertaking than the Thad Hill-adjacent campus, and reinforces the strategy of pairing large-scale data center development directly with dedicated natural gas generation capacity.

The approach addresses power availability constraints that have become an increasing concern for data center developers seeking to build at scale, particularly in markets experiencing high demand from artificial intelligence and cloud computing workloads.

The full details of the Fairfield campus had not been previously announced prior to the TDLR permit filings becoming available.

CyrusOne has not yet disclosed which customers or hyperscalers, if any, are in discussions for capacity at the three buildings, and the permit documentation confirms that no tenants have been formally assigned to date.