The waste heat is converted into cooling capacity, and the small heat surplus is dumped into aquifers 300 m below ground level, where it is stored and recovered in winter.

CNN: ASIANOW - TIME Asia

When combined with other restrictions on coal ash and cooling water EPA is planning, capacity losses will more likely be somewhere between 3.5% and 7%.

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In addition, the inherent benefits of the platform, including the helium fill, allow HGST to significantly improve datacenter TCO on virtually every level: capacity, power, cooling and storage density.

ENGADGET: HGST develops helium-filled, high-capacity hard drives: no, they won't float away

As one of America's greenest banks we plan to take full advantage of the additional capacity and advanced power and cooling capabilities unique to zEnterprise.

ENGADGET: IBM's zEnterprise architecture makes mainframes cool again, also efficient (video)

The racks would rarely be nearing physical capacity, but might actually be maxed out in logical capacity due to power or cooling constraints at the rack level (the mantra to avoid creating hot spots in data centers has actually made floor and rack use a lot less efficient).

FORBES: The Case for the Infinite Data Center