This reports, in absolute watts, the designed non-redundant capacity of this phase, every currently-valid module assigned to it minus however many are configured as redundant spares, multiplied by their nominal wattage rating, giving the absolute-watts equivalent of the percentage figure in tsiPhaseInstalledPowerRatioW. It is the concrete headroom-in-watts figure an admin needs when planning exactly how many more watts of new equipment a phase can absorb without eating into its redundancy margin. An admin evaluating whether a new 2kW piece of equipment can go on this phase would subtract tsiPhaseCurrentPowerInW from this value to see the actual watts of headroom available before touching redundancy.