This read-only Counter64 accumulates the total energy delivered on the ZX1 branch circuit in decaWatt-seconds, and per the object's description must be divided by 360 to convert the value to Watt-hours. An admin tracks this running total to see how much load the ZX1 branch specifically has carried over time, which is useful for balancing load across the PDU's multiple phase pairs or for energy billing per branch. For example, if energyzx1s reads 1,800,000, dividing by 360 shows the ZX1 branch has delivered 5,000 Watt-hours since the counter last reset, which the admin can compare against the other branches to spot an imbalance.