DataCenterChill synthesis · Based on the primary source listed below
DarkNX entered an agreement to use Accelsius NeuCool across a planned 300 MW AI data-center campus in Ontario. The first phase is described as two 65 MW facilities with deployment targeted for 2026 and 2027.
The proposed thermal chain combines Accelsius two-phase direct-to-chip cooling with high-efficiency Johnson Controls chillers. Accelsius emphasizes warmer facility-water operation as a route to more free-cooling hours.
This is an announced agreement, not yet an operating 300 MW deployment. Public materials do not identify project economics, utility interconnection, construction milestones, or the remaining phase schedule.
NeuCool uses a non-conductive fluid that boils at cold plates on the chips and condenses within the cooling loop. The proposed advantage is not only high heat capture. Accelsius says its warmer inlet requirement can reduce compressor work because outdoor conditions can carry more of the load. Ontario's climate may support that design, but the actual energy result depends on the site, the server load, approach temperatures, pump power, and the part of each rack that still rejects heat to air.
Why the agreement matters is its intended scale. Two-phase direct-to-chip systems are visible in pilots, but a 300 megawatt campus would require repeatable manufacturing, fluid supply, controls, commissioning, and service across several buildings. The first phase is only 130 megawatts, so the headline capacity should not be read as a single scheduled delivery. Nor does the release say whether the figures describe information-technology load, total facility power, or another planning measure.
The only cited evidence is Accelsius's announcement. It includes statements from DarkNX and names Johnson Controls, but it gives no site address, permit, utility agreement, financing, equipment quantity, contract value, or construction update. Those omissions limit the claim to supplier selection and intent. A named parcel, power allocation, building permit, financing close, equipment shipment, or ground works would show that the project has advanced. Commissioning and measured operation would be needed before any part of the 300 megawatts should be counted as live capacity.