This read-only value reports the total PoE power capacity available on a specific stack unit, in milliwatts. An admin uses this per-unit figure in a stacking environment to understand each individual switch's power budget rather than relying only on the aggregate stack total. For example, in a 3-unit stack where each unit reports 370000 mWatts total capacity, an admin knows to distribute high-draw PoE devices across units rather than concentrating them on one.