Medium voltage power distribution

A data center includes an enclosure defining an interior space, a medium voltage power distribution system in the interior space, a plurality of transformers in the interior space, and a plurality of groups of racks in the interior space. The medium voltage power distribution system is electrically connected to a medium voltage power source outside the enclosure and includes a plurality of interconnected medium voltage power access units. Each transformer is electrically connected to an associated medium voltage power access unit and configured to step-down medium voltage power from the associated power access unit to low voltage power. Each rack includes a plurality of rack-mounted computers. Each group of racks is electrically connected to an associated transformer or to an adjacent rack or group of racks such that the associated transformer provides low voltage power to the group of racks.