The present source of output power. The enumeration none(2) indicates that there is no source of output power (and therefore no output power), for example, the system has opened the output breaker. 'normal', 'bypass', and 'battery' indicate those common UPS statuses. 'booster' and 'reducer' indicate boost or buck operation, for line-interactive UPSs only. 'parallelCapacity' and 'parallelRedundant' indicate a normal parallel UPS system, in either Parallel for Capacity or Redundancy configuration. 'highEfficiencyMode' is normal but enhanced by High Efficiency mode. 'maintenanceBypass' indicates that the UPS is in Maintenance/Manual Bypass mode. 'essMode' is normal but enhanced by Energy Saver System. 'other' covers any other, unusual conditions.