Let’s start with a short review of what stranded power is and what is its cause. Stranded power is running out of room in your data center server hall (also referred to as “white space”) before you run out of installed UPS capacity.
Invariably the culprit is over-optimistic projections for power densities (expressed in kW/rack) in a data center’s design phase. If a 2 MW data center is designed to house racks with an average power density of 8 kW/rack it would be designed to house 250 racks. If those racks actually average a power consumption of 5 kW/rack, by the time you fill all available space you will be using 1.25 MW of power and cooling. You have thus stranded 0.75 MW of power. At an average construction cost of $12M/MW, you have stranded $9M worth of power and cooling infrastructure. Needless to say, that is a poor use of corporate capital.