This read-only Integer32 reports the current capacity, in amps, of only the rectifiers that are currently online and active in the Dc1 plant, which can be less than the total installed capacity if some rectifiers are offline or failed. Comparing this to the installed capacity value lets an admin detect that one or more rectifiers have dropped out even though the plant is still running. For example, if installed capacity is 600 amps but on-line capacity reads only 450 amps, the admin knows a rectifier module has failed or been taken offline.