This design-build data center is housed within an existing four-story office building with 540 kW ultimate critical load (270 kW Day 1) supported by in-row cooling units with cold aisle containment. Critical power distribution is supported by A & B electrical paths with redundant 300 kW UPS machines feeding in-row power distribution units (PDUs). Critical rack power is fed from overhead busways via the in-row PDUs. The data center is backed up by redundant 1250 kW diesel generators with 48-hour run time capacity at full load.