Most data center power sizing is either overbuilt (wasting capital) or undersized (limiting future capacity).
Start with IT load: compute (servers, GPUs), networking (switches, routers), and storage. Multiply by 1.3-1.5x for power distribution losses and inefficiencies. Add cooling load: for air-cooled facilities, plan 0.8-1.2x the IT load. For liquid-cooled GPU clusters, cooling can be 0.3-0.5x IT load (much more efficient). Then add overhead: lighting, physical security, fire suppression (usually 5-10% of total). That gives you total facility load in kW.
Redundancy adds to requirements. N+1 means you size for peak load plus one additional unit of capacity. 2N means two independent systems, each capable of full load. If your IT load is 10 MW and you go 2N, you're building electrical infrastructure for 20 MW. UPS and generator systems must match your redundancy target: if power fails, your backup systems need to carry full load without overloading.
Size for growth but don't overbuild. Electrical infrastructure has 15-30 year lifespans, but IT load density changes every 3-5 years. Build your power backbone (utility service, main switchgear) for 10-year capacity, but keep UPS and branch distribution modular so you can add capacity incrementally. Overbuilding costs you in capital, financing, and operational overhead for capacity you're not using.
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Text PJ: 773-544-1231AI compute infrastructure is moving fast. Companies are making expensive mistakes by committing to solutions before understanding their actual requirements. Good decisions come from understanding power, cooling, redundancy, and execution quality — not just hardware specs.