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The PUE: useful but incomplete
Power Usage Effectiveness (PUE) has become the universal benchmark for measuring data center efficiency. A PUE of 1.0 means that all the energy goes to the computation; a PUE of 2.0 means that half of it is wasted on cooling and distribution. Today's best data centers are 1.1 to 1.2.
FirstBlock displays a PUE of 1.1. But the PUE alone does not tell the whole story.
The WUE: the forgotten dimension
The Water Usage Effectiveness measures water consumption per kWh of calculation. Air-cooled data centers with evaporative cooling towers consume an average of 1.8 liters of water per kWh — or millions of liters per year for a 10 MW facility.
FirstBlock's direct liquid cooling works in a closed loop. WUE = 0. For organizations with water footprint reduction commitments, this is critical.
The CUE: the real carbon footprint
Carbon Usage Effectiveness expresses CO₂ emissions per kWh of calculation. Powered by Quebec hydroelectricity, FirstBlock has a CUE of less than 0.002 kg CO₂/kWh — compared to 0.4 kg on average for a data center powered by the typical U.S. grid.
The real metric: net energy exports
The metric that no one measures yet, but which will become standard: what proportion of the energy consumed is recovered and reused? With HeatConnect, FirstBlock aims for a heat recovery ratio of more than 70%. An AI infrastructure that exports useful heat is no longer a net energy consumer — it's a node in a distributed energy system.
