This room contains the Emergency Storage Cells. These quantum-field generators serve as a non-Artron auxiliary power source if the Eye of Harmony should prove insufficient. The Transpower System charges them whenever a TARDIS is in Normal Space. Minor life support needs, like interior lighting, are usually powered by the auxiliary power source. A TARDIS can be put on Emergency Power to prevent it being detected

Assuming some power is available, using the Architectural Coordinate Selector, specific rooms can be converted into Artron Energy, by collapsing their shells and feeding them into a TARDIS's Mass Converter. If these Emergency Power Units fail, there are also Back-up Systems that can provide limited power.

In the event of a sudden loss of all power, emergency life-support masks will drop down in the control room for each crew member. Aside from these masks the only source of air, gravity, heat, and other life-support needs is what "leaks" in from the outside environment. The Block-Transfer equations that make up the interior and exterior of a TARDIS are mathematically stable. Should all power in a TARDIS fail, the interior will remain structurally sound but the flow of time on the interior will slow down relative to the exterior.